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Turbo flutter

SCR34M3R

By SCR34M3R,
in Engines & Forced Induction

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SCR34M3R Rising Star

SCR34M3R

Posted
Posted

Well we are fixing a lot of stuff up on my car and i got a highflow turbo, and on the slightest accelation it flutters and on revving, and when not on boost it flutters. Just wondering how we can stop it fluttering so much. any help would be great

Thanks

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SCR34M3R Rising Star

SCR34M3R

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do you have a pod? And what about the stock plumback BOV? Is that connected? And finally do you have an aftermarket BOV? if you do have an aftermarket BOV try loosening it, mabye the spring is too tight thats why you get flutter.

yep got a pod, no stock bov has aftermarket one, and no matter where it is adjusted it still flutters loosen it off or fully tight still does.

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R33SUM Collaborator

R33SUM

Posted
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same thign happens to mine dude i had a blitz ss and now have a HKS SSQV no matter how loose i make the spring it still flutters like crazt out of the filter when accelerator is released.....i have th estock bov capped off but still in postition at the sake of loosing boost u rekon its worth runnin the stock and the HKS???

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46n2 Mentor

46n2

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Aftermarket BOV's have a higher spring rate than factory bov's. So where the factory bov will open up when releasing light throttle, the aftermarket one does not. Please correct me if i'm wrong. when there is no bov this causes a build-up of pressure in the intake piping, slowing the compressor wheel - and hence the flutter. I think the same principle applies to aftermarket BOV's which don't open under light load, but obviously you don't have as much of a pressure build up as you would jumping off the gas from WOT.

There are a few war-threads where everyone has thrown their 2c in about BOVs which might be worth a read such as this.

:P

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46n2 Mentor

46n2

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sorry i ment not when accelerating

Basically i'm saying it's not uncommon for car with aftermarket bovs to make the fluttering sound when backing off from light throttle. This is different when it comes to the HKS SSQ bov's and the like. when driving with a heavier right foot, the fluttering noise is by design and made by the BOV (and not the turbine).

:rofl:

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zoom Community Regular

zoom

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i've got the same problem at the moment! however, only when i floored in 4th/5th gear from say 2000rpm and it flutter at about 3000rpm. 1st/2nd/3rd gear is fine as it will rev to 7000rpm! i'm thinking it might be the turbo surging. btw it's a GCG stage 1 high flow. anyone experience this before? any help would be appreciated!! :P

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burko1 Veteran

burko1

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i've got the same problem at the moment! however, only when i floored in 4th/5th gear from say 2000rpm and it flutter at about 3000rpm. 1st/2nd/3rd gear is fine as it will rev to 7000rpm! i'm thinking it might be the turbo surging. btw it's a GCG stage 1 high flow. anyone experience this before? any help would be appreciated!!  :(

I HAVE THE SAME PROBLEM CRUISING VERY LIGHT THROTTLE VERY NOTICEABLE ON THE FREEWAY IT JUST KEEPS FLUTTERING. I HAVE A GCG HIGH FLOWED TURBO POD FILTER AND AFTER MARKET BOV. IM GOING TO TRY A STANDARD BOV. LET ME KNOW IF ANYONE DOES FIX THEIRS

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Al Grand Master

Al

Posted
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i've got the same problem at the moment! however, only when i floored in 4th/5th gear from say 2000rpm and it flutter at about 3000rpm. 1st/2nd/3rd gear is fine as it will rev to 7000rpm! i'm thinking it might be the turbo surging. btw it's a GCG stage 1 high flow. anyone experience this before? any help would be appreciated!!  :(

Just put on a s/h hi-flow turbo, i believe it may be a GCG unit as it has the sierra-sierra turbine combination and is also b/b core. Whereas ATP replace the b/b core with a bush unit.

If i plant the foot in any gear the turbo spools nicely and puts down the power. If i cruise easily, at 0.5bar the turbo will flutter while i am still accelerating. Boost flutters back and forth between about 0.4bar and 1.2bar, till i floor it or change gear. The previous owner swears he had no such issue with the turbo. And i know my mechanic played arround with the integral gate, while on the dyno.

I have come up with a few possiblities that still need to be tested.

1/ Integral wastegate is not working 100%

2/ The intake pipe may be partly collasping under light loads (harmonics) thus effecting intake air.

3/ Also want to temporarily remove new Turbosmart bov, just to eliminate it as a fault.

Any other suggestions.

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