Turbo flutter

Adam in CLE

Well-Known Member
Hey all, getting a lot of turbo flutter. Did some research and found that factory setup is to have a bypass vs wastegate. Any ideas before I spend more money on parts that I can look into in the current setup? I am thinking something may not be correct or is worn out.

Thanks in advance!
 

Desert Sasqwatch

Bigfoot Goblin
When are you getting flutter? Under acceleration or deceleration?

If under acceleration, one problem could be the bypass gate actuation arm is probably not adjusted correctly allowing it to be slightly open creating flutter. Could also be the vacuum solenoid is bad - located on top of the intake manifold.

Under deceleration there could be a small amount flutter and this is okay as long as it is not causing surging. A lot of flutter could be a bad waste gate actuator - the plastic piece on the end of the waste gate arm with the vacuum line going to it.

Or the vacuum lines are not run correctly. Most often this could be the lines from the vacuum solenoid are swapped.
 

Cnixon160

Active Member
Unless your just concerned with the noise flutter or compressor stall on decel doesn't hurt anything I'm not even running a BOV of any kind on my setup, if you are getting large amounts of flutter on power then you have some problems as this typically leads to semi prompt self disassembly of the compressor wheel from the turbine shaft
 

Adam in CLE

Well-Known Member
Thanks Desert Sasqwatch. It is on decel. Lots of flutter no surging I have an aftermarket waste gate and will check that. There are no issues on acceleration. All plumbing is run correctly.

Cnixon, according to my research, flutter can make the turbo bearing go bad over time.
 

Cnixon160

Active Member
There's a ton of wildly varied opinions all of which claim to be supported by tons of research, from a practical standpoint I have a few thousand miles on my goblin with no wastegate and an eBay special 3582r on ~11psi literally tens of thousands of flutters with no notable wear, I have also run numerous setups from 7-1100whp without them without any notable issues, that being said I have eviscerated a turbo after roughly eight to ten seconds of power on stall but that's a completely different loading of the compressor and doesn't appear to be what your experiencing, if your using the factory internal bypass then you likely have a reference line switched up somewhere
 

SmsDetroit

Goblin Guru
If it sounds li a turkey lol when you get out of it I had the same problem. I found someone installed 3 bar maps on my donor with a stock tune. I switched it back to stock maps and problem solved
 

SmsDetroit

Goblin Guru
So I just installed my new PCM from ZZP. I reinstalled the 3 bar map sensors. Under normal acceleration it’s fine. Under high boost I’m getting flutter when I shift
 

Desert Sasqwatch

Bigfoot Goblin
You have no lift shifting ability - see if it flutters. Guessing the flutter is just a by product of engine decel during liftoff between gears.
 

Cnixon160

Active Member
The high boost flutter is a byproduct of outflowing the stock bypass and removing the factory filterbox and piping, as previously stated off throttle flutter is not harmful, surging or stall/flutter on throttle is pure murder
 
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