Turbo flutter when letting off throttle

turbo flutter when letting off throttle i know the MAF makes it hard/impossible Now to my question I have searched alot and cant find an answer, i have a 2000 E46 330d touring 184hp 5spd manual. I put my head next to the intake and bring the rpms up then release the throttle , then the flutter comes after . It’s never constant hard time making it reoccur. I put in a 24" muffler but that only took it down by 30% or so. Onto throttles - yes, there are diesel engines now which utilise ECU controlled throttle does anyone know what this could be? i get a fluttering sound coming from the turbo area. Jun 28, 2015 · the turbo chatter is caused by the diverter valve (bov) not opening correctly this sound is bad for the turbo as when you let off the turbo is still spinning and compressing air but the throttle is shut giving the air no where to go, once the pressure is high enough (fractions of a second) the air will start forcing its way back past the compressor housing stalling the turbo (the noise you get Oct 28, 2020 · While I can't hear the turbo spool on our 1. 5-20psi) the fluttering disapears. if u want flutter: 1. Discussion Starter · #1 · Mar 20, 2014. The "flutter" occurs when upon shutting the throttle, air caught between the free-spinning turbo and the shut throttle. A few years ago i had a 3dr cosworth running 36psi and no dump valve lovely sound and also didn`t break the turbo but they run a bigger shaft on a T34 turbo. Off-throttle flutter/surge as charge air exits back through the compressor isn't quite the same in terms of detriment to the turbo as on-boost surge and there are plenty of tunes that cause a little surge once in a whilehard not too driving a v. The only perceptible sound is if the car is in Sport mode and you momentarily let off the throttle. Mine runs real sluggish right at 40mph, as well as 2-3 mph up or down Jun 04, 2020 · Is turbo flutter bad for your turbo? When the compressed air has nowhere to go, it causes the turbo rotational speed to rapidly drop, and attempts to push against the wheel. Flutter sound with throttle OPEN - video included. Actual wastegate flutter occurs instead under partial boost conditions such as partial throttle near the Dec 27, 2014 · Over the past few weeks, I've noticed I'm getting a lot more turbo flutter than I used to. 5 bar of boost. Best way to remedy it is get a blow off valve, or have a smaller transition from load to coasting. While the engine shuts off airflow, all the pressure from the turbo is still there — looking for somewhere to escape. Any time im in boost and let off the throttle it flutters really loud kinda sounds like a turkey call Jan 08, 2016 · Having a turbocharged performance car is an incredible thing. I also have a throttle controller and as I go through the different setting the flutter changes Nov 26, 2005 · The flutter/surge is caused by the compressor coming off of it's efficiency range (map). its a sic noise thats common on alot of turbo cars. Onto throttles - yes, there are diesel engines now which utilise ECU controlled throttle May 17, 2005 · This basically happens because the air in the intake tract after the turbo is perpetually bouncing back and forth from the throttle plate to the turbine blades until it dissipates. Sign in with Facebook Mar 02, 2010 · There is confusion in the automotive world about so called "wastegate chatter" or "turbo flutter". Sep 09, 2020 · So my turbo is fluttering/surging everytime I let off the throttle which doesn’t sound good anywhere above 10 psi I have a Turbosmart bov and I’ve been adjusting it and no matter how tight or loose I set it it doesn’t sound like anything’s changing. Blow off valves will release this pressurized air and makes a desirable hissing noise. Lately while driving my cobalt sstc and during shifts the turbo flutters terrible. Sign in with Microsoft. could this be compressor surge? i've been trying to get my car tuned but something is making my car run rich like a leak somewhere but the fluttering sound seems Jun 05, 2019 · When I'm driving down the road in about 3rd gear the turbo starts to flutter/surge/stutter at about 4-5k rpm and then sometimes goes into limp mode. Again it is on throttle not off but is sounds like the RBV flutter. Jul 06, 2021 · Ok before i get attacked, hear me out please! I know the consequences I wont get more power Yes im a child Ive done a ton of research. Fits 2016-Up XP Turbo models. Google the whippoorwill bird call. Mar 06, 2019 · Flutter comes from a delayed or malfunctioning bov/bpv when letting off the throttle during boost. The fluttering you hear is the purge solenoids (diverter valves) releasing the extra pressure that is now in the intake piping. And most the reason for BOVs on OEM vehicles is noise surpression and due to the AFMs not really liking it. Mar 20, 2014 · Joined Feb 14, 2014. 2. Had the repair done to the tune of $1,100. This is the sound of air harmlessly escaping your turbo. As the turbo is on boost, the intake system will become filled with pressurized air from the turbo compressor. of boost. Apr 09, 2013 · Along with that there's is this fluttering sound coming from the intake/turbo area . Jun 04, 2020 · Is turbo flutter bad for your turbo? When the compressed air has nowhere to go, it causes the turbo rotational speed to rapidly drop, and attempts to push against the wheel. I'm new to the tuning game and I believe this is a tuning problem. Nov 08, 2014 · I have a 2005 6. This can cause premature wear on your turbo, however closed throttle flutter on modern turbochargers is unlikely to cause a noticeable drop in turbocharger lifespan. It is a two-fold problem on the USDM 2008 STI: when lifting, the fuel continues for a period of time and the throttle plate also stays open. Jayg Veteran Member. small turbo hard like the tunes do. Following this, a rush of boost goes into the engine and back into the turbo because of the closed throttle plate. I could feel less performance while this was happening. #3 · Jan 4, 2004. That, and sometimes my idle is inconsistently rough(I have all new index 12 injectors, plugs, coils, etc, but also have aluminum motor mount jnserts and stiffer trans bushing so the NVH can be pretty noticeable with the auto trans. My car does it too. It almost sounds like a really quiet wastegate on a turbo. could this be compressor surge? i've been trying to get my car tuned but something is making my car run rich like a leak somewhere but the fluttering sound seems May 17, 2021 · Take compressor surge or “turbo flutter” for instance. could this be compressor surge? i've been trying to get my car tuned but something is making my car run rich like a leak somewhere but the fluttering sound seems Aug 25, 2019 · Now, letting off light throttle or low boost will give a slight turbo flutter which I believe is fairly normal as there is not enough pressure to vent to atmosphere ( this noise was not present before stage 1 ) but I am also getting a slight flutter feeling whilst building high boost and that is worrying me slightly and then after dumping on Nov 22, 2009 · so i have a 97 240sx with a stock t25 on the sr20 blacktop motor and the megan racing bov i have is connected to the 3 in ic piping and i reciculated back to my intake but it flutters like hell. 1. I understand what you are saying about the car jerking when letting off of the gas; you can add me to that list. Feb 10, 2021 · Turbo flutter, also known as compressor surge, occurs when you step off the accelerator after achieving peak boost. I was able to maintain speed, but this experience was new to me. The Turbosmart Plumb Back model is designed to be the quiet model. Apr 08, 2006 · Or sign in with one of these services. It's not BOV flutter. Has anyone else had issues with this or found a fix? I’m just running the intercooler and intake, no BOV or anything. When in limp mode it lets me drive it at a maintain speed but does not let me accelerate like it should and can't hear the turbo. With the throttle body closing, pressure builds in the InterCooler tubing and backs up back into the turbo since the bypass route stays closed, causing increased strain and rapid/forced deceleration of the turbine wheels inside the turbo. Mar 09, 2020 · I would constantly see the boost gauge bounce from 0 to ~15+ until I let off the throttle, and as soon as I got back on the accelerator the boost would start bouncing again. Apr 26, 2016 · Turbo flutter is when a throttle plate is closed and the excess boost vents back through the turbo compressor. Mar 17, 2019 · Hey guys. Easily convert back to the factory diverter routing for extreme conditions. I've been reading and searching other forums , some say compression surge and some say change the spring rate of the bov . Apr 25, 2020 · When cruising at speed, we hear this kind of clatter sometimes, but letting off the gas stops it. Unless you mean the BPV just triggers early under partial, which is nothing because that’s just how sensitive the stock BPV and solenoid is. Jun 14, 2018 · Yes that is from the turbo. I brought the car to BMW and they said I had a cracked vacuum oil pump and that was likely making the noise. it's annoying the hell out of me and sounds like a leak or something during high boost. About the 40mph thing, is that in reference to the gas pedal thing, or are you referring to your engine running kind of sluggish. Turbo would be hardly spooling. Oct 18, 2021 · The sound of air escaping the blow off valve has been described as turbo flutter by some, but is different in a few key ways. (I speak from experience. the "flutter" or compressor surge is the sound a turbocharger makes when the throttle body snaps shut, the charged air has nowhere to go, so it goes out back where it came from, violently spinning the turbocharger from around its maximum of around 100,000 RPM to NEGATIVE revolutions, it is spinning backwards. Mar 16, 2020 · Seem to be getting some turbo flutter at random times. . This is happening in and around town mostly and the way I've been duplicating is to get up to normal speed (25-45 mph) give a constant amount of throttle input and then let off the throttle normally (aka Aug 23, 2021 · There is a lot of bad info out there on this - the video link in my first response is a good explanation. This means power is lost as the turbo spools back up again. Jul 30, 2019 · A blow off valve (often called dump valve) is located between the turbo compressor and the throttle. ·. I get the car back and the vehicle is still making the same noise. It's got RKT drop in (14. Many things can contribute to a lean condition as noted above, but two other possible causes not mentioned are. larger intercooler. It just means you have excess air that gets forced out the turbo when you close the throttle. When you build boost pressure and let off on the gas pedal, you close the throttle body. When my VT is under moderate to heavy acceleration (75+% throttle), the high-pitched sound coming from the intake seems to flutter or chatter, instead of making a solid or even hissing noise. could this be compressor surge? i've been trying to get my car tuned but something is making my car run rich like a leak somewhere but the fluttering sound seems Jul 18, 2011 · A cause of flutter with a recirc valve (like the Forge 007p) is a spring that is too stiff for the boost produced. this is all according to my finds. Sent from my iPhone using Tapatalk Apr 19, 2006 · flutter is the noise after you let off the throttle. As copied and pasted from the Turbosmart web pages: The "flutter" noise reported by many excited enthusiasts may sound good but is actually very unhealthy for the turbo. notenoughtime, Apr 15, 2014. Joined Jul 30, 2018. It’s not any type of rotating noise, as from the drivetrain. could this be compressor surge? i've been trying to get my car tuned but something is making my car run rich like a leak somewhere but the fluttering sound seems Aug 25, 2019 · Now, letting off light throttle or low boost will give a slight turbo flutter which I believe is fairly normal as there is not enough pressure to vent to atmosphere ( this noise was not present before stage 1 ) but I am also getting a slight flutter feeling whilst building high boost and that is worrying me slightly and then after dumping on Mar 31, 2021 · Was curious if anyone could describe the expected sound of these cars when letting off the throttle during boost. random burs of minor power loss), but the moment you left off throttle with a quickness Apr 21, 2012 · Turbos NEVER stop spinning when you let off the throttle, never mind go backwards! Contrary to popular myth, they lose speed LESS with no BOV than with one. On the other hand, if you hear turbo flutter when you’re on the power – known as open-throttle compressor surge, then brace for big bills. could this be compressor surge? i've been trying to get my car tuned but something is making my car run rich like a leak somewhere but the fluttering sound seems Oct 07, 2018 · A blow-off valve offers another way to vent that excess pressure between the turbo and throttle plate, but that sound is just so 2009. Nothing to worry about unless maybe if happens after WOT in boost. Actual wastegate flutter occurs instead under partial boost conditions such as partial throttle near the Jun 04, 2020 · Is turbo flutter bad for your turbo? When the compressed air has nowhere to go, it causes the turbo rotational speed to rapidly drop, and attempts to push against the wheel. Even if I’m above 15 psi when I let off the throttle I hear a second of flutter before I hear the BOV, for some reason there is a delay that isn’t there when connected to the stock solenoid. Almost like a valve is repeatedly opening and closing to release air. Apr 02, 2014 · I installed a 4L80E and a new converter and noticed an issue on the highway. Sep 28, 2010 · A compressor stall like this can cause excess stress and wear on the turbo's shaft or bearings under higher load applications of the turbo (around 15 psi (1. As the name suggests, compressor surge occurs on the compressor side of the turbocharger – outside air is drawn in and compressed for the engine to consume and used on the turbine side Jun 04, 2020 · Is turbo flutter bad for your turbo? When the compressed air has nowhere to go, it causes the turbo rotational speed to rapidly drop, and attempts to push against the wheel. That noise may tell the world you have a turbo, but the truth is, the sound signals a problem. could this be compressor surge? i've been trying to get my car tuned but something is making my car run rich like a leak somewhere but the fluttering sound seems May 18, 2019 · I'm driving at 2500 - 3000 RPMs, and I'm not using much throttle at all - let's say 10%. Most of the way we were going ~80 MPH. The wastegate would probably only be active while maintaining a certain level of desired boost while on the throttle. could this be compressor surge? i've been trying to get my car tuned but something is making my car run rich like a leak somewhere but the fluttering sound seems May 02, 2010 · First this noise that you hear when letting off the throttle after a hard acceleration, does it sound more like a flutter thru the air fllter? If this is the case, according for ford engineers the noise is a normal operating charicteristic of the way the turbo system works and should not be addressed as a concern. 8 TSI, there is a noise at low speed when letting off the gas. This means that the air after you lift throttle goes back to the still spinning turbo blades hitting with them and creating that flutter noise. That being stated, I think compressor stall will not damage the turbo but just slows down the turbine wheel. Example- Highway driving in 6th gear i floor it at 2500rpm. Every time you lift off the throttle the bov should open quickly then close again fully. I noticed that after my Rev9 intercooler install that I get a bit of turbo flutter after I let of the throttle quickly. the DV doesn't let enough boost out which can cause the turbo to stall when lifting off on full boost! not enough evidence to suggest that its damaging, a lot of jap cars run without a DV completely. After 3500rpm (19. Mar 02, 2021 · Turbo flutter only happens when you lift off the throttle. At about 2900rpm till 3500rpm (18-19psi) something starts fluttering distinctly. Otherwise these folks would not be having turbo flutter. As the name suggests, compressor surge occurs on the compressor side of the turbocharger – outside air is drawn in and compressed for the engine to consume and used on the turbine side Feb 16, 2009 · turbo spinning backwards. After it starts fluttering it is difficult to build more pressure and I know that this truck is capable of 24 lbs. compressor surge is are backin gout the turbo under full throttle at low RPMS due to our small turbos spooling up so fast. I must’ve had a small boost leak, because it sounds way cleaner under boost, however now I notice a sound not unlike the gunslinger’s sound from the does anyone know what this could be? i get a fluttering sound coming from the turbo area. Jul 26, 2018 · Discussion Starter · #1 · Jul 26, 2018. 4. does anyone know what this could be? i get a fluttering sound coming from the turbo area. Oct 07, 2012 · I would roll on the throttle a little to speed up from 45 to 60 mph hitting about 5 pounds of boost. Nov 19, 2018 · Re: Turbo Flutter/Surge off throttle - DV solenoid? « Reply #13 on: November 30, 2018, 03:02:35 pm » i just find it so hard to believe this to be the CAI when others don't do it Only happens when letting off the throttle. could this be compressor surge? i've been trying to get my car tuned but something is making my car run rich like a leak somewhere but the fluttering sound seems The sound of turbo flutter, or compressor surge, is sometimes referred to as ‘wastegate chatter’ – but this noise has nothing to do with the wastegate. May 01, 2016 · I have a 2004 Forester 2. Apr 22, 2010 · If you're doing a draw-threw setup, realistically, the MAF should be a minimum 16" from the turbo, (I think it's 18" to be truthful). I noticed right on light throttle I have a really loud turbo flutter, even under no boost, could it be the tune or maybe the BOV, I didn't have this at all when I was stock. Sometimes I'm driving down the freeway and when I press the clutch and let off the gas pedal it will die when the RPMs drop. Nov 19, 2014 · Turbo s2000, sleeved block, 600cc injectors. Joined Oct 23, 2012 Location Jun 04, 2020 · Is turbo flutter bad for your turbo? When the compressed air has nowhere to go, it causes the turbo rotational speed to rapidly drop, and attempts to push against the wheel. This occurs when you take your foot off the gas pedal abruptly, causing the throttle plate to close. Aug 23, 2019 · Re: Turbo flutter/chatter. could this be compressor surge? i've been trying to get my car tuned but something is making my car run rich like a leak somewhere but the fluttering sound seems Jun 04, 2020 · Is turbo flutter bad for your turbo? When the compressed air has nowhere to go, it causes the turbo rotational speed to rapidly drop, and attempts to push against the wheel. It doesn't happen every time. I’m wondering if it’s something turbo related. I have the same problem but running a 1g bov. Sometimes it happens many times in a row. I get flutter on my DV+ as you do but only on partial throttle 1/3-1/2 slowly building revs and then on the gear change or when the throttle is released. I've read that if your BPV or BOV doesn't work properly it can be very bad for the car as then extra pressure will force air the wrong way back through the turbo. 78 280z Black Pearl L28et. Is that normal? I though stock vehicles did not have a blow off valve. Nov 23, 2009 · 179 Posts. If you take the small pipe from the intercooler pipe and run it directly to the wastegate actuator you will see the boost needle will not flicker because the wastegate will let a bit of boost past quite early allowing it to look smooth but you will notice a Aug 13, 2017 · I get a little flutter-like sounds at low load when letting off the gas or shifting at times. #7. #1. Click to expand does anyone know what this could be? i get a fluttering sound coming from the turbo area. If I ease off at all, and go to anywhere from 0 - 5% throttle, I get a bunch of "fluttering" noises. I Jun 04, 2020 · Is turbo flutter bad for your turbo? When the compressed air has nowhere to go, it causes the turbo rotational speed to rapidly drop, and attempts to push against the wheel. Edit: beaten to it lol. The driver will faintly hear the second syllable of a whippoorwill bird call coming out of the intake on the left side of the hood. Sep 08, 2014 · Ever since that day, the X5 has been making a loud humming noise after the car accelerates past 20-25mph and is let off the gas. The sound is obviously much louder now that I'm running with an Injen CAI Sep 29, 2015 · Afaik if your turbo is making flutter unintentionally, it's sign of a failing bypass valve or blow-off valve. remove/block bov. Even turbo lag, often considered the enemy of blown cars, can be enjoyable in its own right. Coming back on the trail from riding the other day I noticed a noise when I get off the throttle. If it's not, (meaning it's less than 18-16") your engine's rpms' will flutter up and down when letting off of the throttle, after load, and if the MAF is at just the wrong length, the car will stall. Popping on decel is a lean condition. Oct 25, 2010 · I getting fluttering sound on throttle at high boost. Gives you that traditional blow off "chhhh" turbo sound when letting off the throttle. May 09, 2021 · Is flutter bad for your turbo? When the compressed air has nowhere to go, it causes the turbo rotational speed to rapidly drop, and attempts to push against the wheel. could this be compressor surge? i've been trying to get my car tuned but something is making my car run rich like a leak somewhere but the fluttering sound seems Mar 01, 2010 · The flutter is caused when the throttle is shut and air caught betweent the free-spinning turbo and the closed throttle (when you have no vent ie blow-off valve). The AIRFLOW stalls, the turbo does not, not by a long shot. I had a GFB bpv that I could adjust the spring for, if I reduced spring pressure it would be more responsive and vent boost very quickly (little to no compressor surge) if I tightened the spring it was slower to vent boost off throttle and I would Apr 27, 2018 · Turbo flutter itself isn’t good. Jan 04, 2004 · 814 Posts. So if anyone has any idea what could be May 07, 2003 · When I let off of the throttle I'm getting a fluttering noise from the engine. Dec 24, 2018 · Flutter sound as in a woosh when you let off the throttle? Or a Flutter noise as if you were blowing into a fan when on the throttle? Mine: 2014 Nismo Juke 6Spd - Injen SRI, FastReligion FMIC, FastReligion Oil Feed line, Stillen Strut Brace, Upper and Lower MannyMount Motor Mounts, GReddy EVO GT Catback Exhaust, 2J Racing Downpipe, 2J Racing Sep 28, 2010 · A compressor stall like this can cause excess stress and wear on the turbo's shaft or bearings under higher load applications of the turbo (around 15 psi (1. Just some info, as always. Dec 20, 2006 · That is known as the turbo fart and is very common on the trucks. could this be compressor surge? i've been trying to get my car tuned but something is making my car run rich like a leak somewhere but the fluttering sound seems Jun 30, 2016 · the fluttering is the turbo modulator cutting in and out, mine does the same and it just proves its doing its job, maintaining boost. Blow off valve (or dump valve is your a chav) is used to prevent this and to allow the turbo to spool up quicker after letting all the air out. Apr 01, 2009 · Posts: 10. It is clearly heard in an inclosed area such as a parking garage. And it gets louder and higher pitched as the boost gets higher. 5 is OK in most cases), which may entail running a wastegate to bleed off excess drive pressure or opening up the exhaust flow via a larger turbine housing. Normal, completely. Easy installation. Sep 10, 2019 · hiss idle is when the vanes on the turbo are closed down to around 80% and 20% open. Mar 20, 2016 · When people think of turbocharged cars, one of the first things that comes to mind is the sound of turbo flutter, that fluttering/chattering sound which happens when the driver backs off the throttle in a hurry, such as when changing gear. It happens when there's not enough pressure to open the blow off valve, and the slight flutter you hear is air hitting the compressor blades. If the turbo isn't making the boost which the ECU is requesting, outside of certain parameters it should throw a code. That's why/how it surges. Not sure if I need to be concerned. Jan 08, 2014 · Jan 7, 2014. weird thing is i only hear it around 1. 5XT and I was wanting to know if anyone can help me or point me into the direction of how to get my turbo to flutter , chatter or dose as people call it, it is known by many different names but it is when someone lifts off the throttle and you hear the stutututu. I've been noticing a flutter from either the engine or trans when at speed and coming off throttle. In rare cases, a backfire pop when accelerating. Mar 01, 2010 · The flutter is caused when the throttle is shut and air caught betweent the free-spinning turbo and the closed throttle (when you have no vent ie blow-off valve). Jul 03, 2000 · I have a boost guage and it normally starts making the flutter at around 19 lbs. Aug 10, 2011 · Flutter when letting of gas. not going to discuss pro/cons of it. Apr 17, 2004 · Dec 14, 2007. steveP, Feb 17, 2009. a free flowing (performance) exhaust. It is more common after some medium-heavy throttle. It almost sounds like an exhaust leak or something cranking down, but it doesn't do it when I'm idling, or when I'm giving the car gas, only when I'm revving and/or cruising and let off of the throttle. Sep 10, 2019 · Registered. #20 · Feb 19, 2014. I'm trying to figure out why this stalls sometimes after letting off the throttle. again. Mar 29, 2010 · Oh, one detail I should have added is that the flutter only happens when letting off the throttle, and definitely sounds like it's coming from the turbo or wastegate. I'm Apr 15, 2014 · The flutter is the turbo stalling and is bad due to the size of the turbo shaft and will snap the shaft, fit a forge re-circ type valve. Turbo Bark or Turbo Farts) is when the engine is still cold and the ambient temperature is below 54*F, and it does this at 1. Like if you say that's ft--ft--ft--ft mine is ftftftft. Vents your stock or BMP diverter valve to the atmosphere instead of into the intake tract. Its a fluttering sound after you let off the throttle. Turbo flutter is not a good thing. My car does the same thing) too much turbo flutter and it can damage the turbine wheels Jun 04, 2020 · Is turbo flutter bad for your turbo? When the compressed air has nowhere to go, it causes the turbo rotational speed to rapidly drop, and attempts to push against the wheel. If there even is a distinct sound. Ok guys I got about 75 miles on my 13. When I do the power brake test it just barely makes the flutter when I let off. A little more info on the truck. 27 Posts. could this be compressor surge? i've been trying to get my car tuned but something is making my car run rich like a leak somewhere but the fluttering sound seems Apr 26, 2009 · 1,058 Posts. 1), SLP pipe, HPS can, and PCV. The blow off valve will make a “psssh” sound, only louder. Apr 23, 2019 · Hey guys, I just installed a Whoosh V1 intercooler, Turbosmart plumb black V2, colder plugs, and a Stratified tune. could this be compressor surge? i've been trying to get my car tuned but something is making my car run rich like a leak somewhere but the fluttering sound seems Oct 09, 2020 · The turbo pressurizes the air, then goes through the intercoolers, then on to the throttle bodies and into the intake manifold. 5 throttle, have at higher RPM's Turbo is a little sluggish (I. e. It hasn’t always done this. Lawrence, KS Sep 27, 2018 · The stock BPV is just trash. I get flutter letting off at anything past 50% throttle, but not if I press the clutch (like when I shift). 16-310. This is your typical BWAHHHHH SU TU TU TUUUU sound. I believe it has something to do w/ having high boost and then just letting off of it real quick. The turbo spools and boost builds but at part throttle the compressor is trying to shove more air into the engine but because the engine cannot handle the flow the pressure builds until the excess has to go somewhere. this spools the turbo some and makes the exhaust hiss and the turbo wissle some then there is the sound of the turbo being spooled slightly, and you let off the throttle, and it whooshes back as the vanes move across the ehxuast flow form you being somewhat on Apr 26, 2016 · Turbo flutter is when a throttle plate is closed and the excess boost vents back through the turbo compressor. 94 Posts. Sometimes when I let off the throttle I will get a very lean spike, almost like the engine it trying to die, but it will catch itself. So the flutter would be heard when lifting off the accelerator pedal suddenly, rather than when accelerating. If the throttle plate snaps shut and the fueling continues, it will go rich while the injectors continue. Jump to Latest foot off the throttle more slowly. I was checking to see if anyone has run into this. Flutter, or compressor surge to give it its proper name is caused by the throttle being closed but the turbo still producing boost, eventually the pressure builds to the point the air starts flowing back through the turbo and releases the pressure, the pressure drops. #3 · Sep 10, 2019 (Edited) guyofthewest said: Post delete, there is a loud howling noise when backing off the throttle, which I understand is typical. 4 TSI as we could with the 1. This can be when coasting or even slowing down, and it’s probably because there isn’t enough fuel getting into the engine as it tries to idle. Any time im in boost and let off the throttle it flutters really loud kinda sounds like a turkey call does anyone know what this could be? i get a fluttering sound coming from the turbo area. Made 316bhp/333ftlbs before my downpipe so on a 'stage 1' Jun 04, 2020 · Is turbo flutter bad for your turbo? When the compressed air has nowhere to go, it causes the turbo rotational speed to rapidly drop, and attempts to push against the wheel. This could seriously mess with your car’s performance. When I would let off the gas and start to cruise at 60 I saw the LEDs on the knock gauge slowing increase then go back to just the single green. Feb 13, 2020 · It doesn’t blow off at all below 12-15 psi, I only get flutter. 0 and the only time that it flutters (I. ive also noticed the actual turbo itself depends heavily on flutter as different sizes and specs will give different noises. When I take my foot off the gas, I just get that classic BOV "Pssh" or if I stomp on it the fluttering and vacuum cleaner suction sound goes away. Still seems to run fine. 25 to 1. I have the forge bpv and it does this and I've switched to stock bpv and the problem persists, so I'm just calling out for a little help fromthe more experienced guys Jun 04, 2020 · Is turbo flutter bad for your turbo? When the compressed air has nowhere to go, it causes the turbo rotational speed to rapidly drop, and attempts to push against the wheel. 3. Sometimes in low gear when letting off the throttle, other times it seems to be while I’m accelerating. Only noticed it on the hardpack coming back. That makes the ATV run a little rich on air for that moment. I haven't changed anything in the tune, or added any new parts. When you quickly press then let off the gas there is a faint whoosh noise. The sound of turbo flutter, or compressor surge, is sometimes referred to as ‘wastegate chatter’ – but this noise has nothing to do with the wastegate. SKU. pod filter. The first is the actual sound. Compressor surge is when you're under boost and then you let off the throttle and the pressure isn't released and goes backwards to the turbo. However I find it super annoying especially when pulling into a campground at 10pm. Nov 22, 2009 · so i have a 97 240sx with a stock t25 on the sr20 blacktop motor and the megan racing bov i have is connected to the 3 in ic piping and i reciculated back to my intake but it flutters like hell. let off easy but when its not doing the flutter it sounds fine with wasy let off or hard but does anyone know what this could be? i get a fluttering sound coming from the turbo area. 1 - 20 of 67 Posts. It's called compressor surge. . It doesn’t seem to do it with my foot into the gas either. 0 bar) and greater depending on the trim and flow rate of the compressor side). aluminum piping. Apr 01, 2021 · So I recently installed a Turbo Xs hybrid blow off valve, when I let off the gas the BOV opens and I can hear the extra boost come out but there is also a flutter from the turbo almost every time. Aug 08, 2017 · "Turbo flutter" happens when you let off the throttle and the BOV / DV doesn't vent or redirect the charge air quick enough or enough air in general, this causes the air to go out the only way it can, right at the compressor wheel. A noise created on lifting off the throttle in a turbocharged car, commonly described as a chipmunk or a rattlesnake, is often stated incorrectly as being a result of the turbo's wastegate closing. And unless you’re getting turbo flutter under WOT or hard acceleration when letting off, it’s not a big deal. exhaust gasket leak. While nothing is wrong with natural aspiration, there’s something utterly addictive about letting off the throttle and hearing turbo flutter loud enough to wake the neighbors. let off easy but when its not doing the flutter it sounds fine with wasy let off or hard but Dec 18, 2018 · After having my throttle body boot pop off, I figured it’d be good to loosen, reseat, and retighten the rest of the connections in my intake. it induces lots of stress on the Jan 09, 2017 · SOLUTION: Keep your turbo’s boost-to-drive pressure ratio as close to 1:1 as possible (1:1. Jul 14, 2008 · I believe it is a recirculating system (the vented air is led back to the intake of the turbo), so you might try disconnecting the large air return tube and check if the BOV opens properly (you can do this by having a friend rev the engine in neutral). Oct 19, 2016 · You're getting the flutter (like a Supra) because your car is not generating enough vacuum to lift the rubber diaphragm (assuming you have the OEM 710N Diverter) and not letting the air escape. Oct 30, 2019 · Turbo flutter. #10 · Dec 23, 2009. ) Jul 27, 2019 · Many riders usually experience a backfire when they suddenly let off the throttle. turbo flutter when letting off throttle

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