Ok, I got a GFB Stealth FX BOV and I love it. Holds boost awesome, sounds great, but it seems to open/close a bit (flutter) when accelerating at low boost. If I punch it, no problems. It seems to be my only issue. No low idle, no stalling, no surging. I've tried from 1.5 up to 5.5 or 6 turns for the spring setting and its still the same. I didn't want to go to tight where it doesn't open and I end up surging. Any GFB owners have any suggestions?

Thanks!

 

Tighten the spring down untill you don't get the fluttering anymore. I had to use 4 turns, but some use around 3...

 

I already went past 5 full turns.. Your saying I should kept tightening it?

 

5 full turns from all the way on the "-" side?

 

Yes, At least 5 full turns from the softest setting. All the way over to the most (-) setting.

 

i have mine at 3.5 turns. You might have it too tight to make it flutter. Only opening part way. I know I had mine at 6 turns or something like that, and had to experiment and lower it down to 3.5.

If you need to, go in 1/4 turn rotations. That might help out too.

 

Yeah, I have triee 1.5 up until 6 full turns.. still the same... thanks

 

Ok, I went all the way up to the highest spring setting and I am still getting the flutter when accelerating in 1st gear. Everything else seem fine. WTF is going on?

 

relieve the tension on the spring.. the bov should be open a little on idle.. and low engine loads.. not to lose though.. just tight enough to stay closed under full throttle.. needs to be open for the mass air, and to relieve pressure cause the wastegate wont.. its the way mitsu desinged things..

 

hmmm.. seems like I have tried every setting.. I guess I will crank it down again and see what happens... I really like this BOV no other problems..even at full VTA

 

did you read my sig.

 

Yes... last I read.. our turbos were not ball bearings. Also this leak (flutter) is during acceleration, not a surge.......

 

never said they were ball bearings.. this is to kid i wrote an hour ago..

i will be honest im now back to the factory... what im going to do is make the spring on the tial really weak.. being how i have everything opened up i can really hear what goes on with the turbo... the factory is open 70% of the time when we drive, even at idle.. its for the mass airflow meter.. and the way mitsu designed our turbo setup... since i have everything opened up, it makes the prob even worse.. if you buy a bigger turbo it will solve the prob.. its just that our turbos spool so easy they dont want to slow down.. the waste gate should regulate it but its to small of a vacuum drop for it to open.. thats why the factory bov has a weak spring to bleed of the pressure.. but if your on it the bov will stay shut because the pressure in the i/c pipe ( trying to open the bov) and the pressure going to the top of the bov, (vacuum line going to the bov ) are equal and the spring holds it shut... my advice to you is lighten up the spring till you dont hear any flutter, but tight enough to keep it closed under full throttle... mine will open up even if i keep the boost up to 15 psi very light load on the motor.. but if i give it a just a little gas it will shut till the load lessens on the motor and then the bov will start to open letting some pressure out for the turbo to scroll down.. long answer huh... i have been meaning to write this up just havent had the chance yet. so now i wrote most the story up.. and i can copy and paste... so i guess thanks.. keep an eye open i will post the link in my sig when done.. oh yeah most vendors will not accknowledge this prob.. or as i was told they chose not to talk about it...

 

thanks for the info!!

 

anytime, i went through alot of aggravation to finally figure this out