Car Is Fluttering On Acceleration

[FOG35]

Just lately my r32 has been fluttering while i have my foot is on the accelerator. It does it when i go up hills and on the highway when i give it a bit. When it does it my boost gauge bounces between about 3 and 7 psi. Sometimes it does it when i hit 7 psi and sometimes it does it at about 2 psi.

Does anyone know what the problem is?

[GunMetalR33]

the fluttering indicates air going back through your turbo which normally happens on cars without BOVs when the trottle closes. Since you are experiencing this issue with the throttle open you must have a blockage in the piping after your turbo and before your trottle. My guess would be something in your intercooler???

[The Dan]

I would be more inclined to check for a blocked fuel filter, fouled spark plug or dodgy coil pack before pulling the piping apart...how exactly does something large enough to block you intake get past the mesh on the AFM and then through the turbo without you knowing about it?

[heyhey!]

definetly fuel issue!!!

my datto used to do it when it got a fuel blokage....freeaked me out!!

[The Dan]

Are you willing to put money on it if you are so sure.

The best way to approach any problem is to start with the basics.

Check the fuel sysetm, then check the ignition system, then check the intake.

If you come up trumps...then start your in depth diagnosis like computer fault codes and other things like that.

Or you could just take the car to a qualified mechanic and he'll do it all for you.

[GunMetalR33]

how does a fuel problem explain the flutter of turbo compresion surge?

[The Dan]

I don't recall him saying the words 'compressor surge'.

[FOG35]

thanks for the replies, ive checked the coils and plugs and they are fine, would i need a fuel pressure gauge to check if fuel was the problem?

plus what is compressor surge?

It does it almost all the time when i hit 7psi in 5th gear on the highway and it doesnt matter if im doing 2500rpm or 3500rpm, its always when it hits 7psi. Could it be wastegate flutter? I have a custom dump pipe.

[GunMetalR33]

When I say compressor surge I am refering to compressed air being pushed back through the turbo when the throttle is closed causing a fluttering sound as the air is "Chopped" up.

I was think that since this happens when the throttle is open that maybe whilst travelling up hill something in the intercooler is blocking the air flow.

I realise that this is a long shot as you should know if somthing was in the intake piping but...

[FOG35]

ok it only does the flutter when i am on boost between 3000rpm and 4000rpm. when it happens it doesnt feel like the car is miss firing. Does anyone else have this problem?

[TokyoTaxi]

I "HAD" this problem with a high flowed RB25 turbo ( T3/T4 internals ) that GCG made up for me. Used to build boost and then start rapidly choofing ( surging ). When I got it back off them after the 3rd time, I just sold it as opposed to trying it out again, purchased a genuine HKS GT25/35 and hey presto............. Problem solved !!