Turbo flutter

[SCR34M3R]

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

[sproosy]

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.

[SCR34M3R]

  sproosy said:

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.

[Al]

Does it flutter while making boost or the moment you release the accelerator?

[SCR34M3R]

normally when acceleratoring but sometimes u can get the accelrator in the right spot and it wont stop fluttering

[sproosy]

Put the stock plumback on and see what it does. looks like your turbo might be surgng also if it flutters when you accelerate.

[SCR34M3R]

sorry i ment not when accelerating, cant put stock one as dont have any stock piping

[Topaz]

sequential BOV will flutter when "blowing off", is that whats happening as well?

[SCR34M3R]

nah u can be doing 100km/h and slightly go faster like 5km/h more and it flutters, or when taking off rev to 2500 change gears and it will flutter, maybe its coz its a cheap bov

[R33SUM]

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???

[46n2]

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.

[Frosty]

this isnt BOV related. Read it again even during acceloration is still flutters.

Def surge issue of some sort but why and where and what are other things!

[46n2]

  Raistlin said:

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).

[SeriesIIGTST]

My mates car was exactly the same. He had big bovus maximum BOV (twin trumpet style) and his turbo fluttered even when driving like a granny. Put a plumb back on and all gone.

[zoom]

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!!

[Cefiro_PWA]

Try remove the blowme off valve.

It is probably damaging your turbo :confused:

[zoom]

  Cefiro_PWA said:

Try remove the blowme off valve.

It is probably damaging your turbo  :confused:

me mean disconnect the bov and not using it?

beside the bov is stock!

[burko1]

  zoom said:

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

[Al]

  zoom said:

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.

[race_snooze]

Mine flutters all the time as well, its the POD filter