Yesterday I met with a few friends at our local piece of straight flat road. Evo's SRT's Sti's and few V-8's come out to see who's got the speed. I've got a fully built twin-turbo with E01's. I usually drive around with the boost set at 15ish depending on the mood for fast driving and have gone as far as 28psi in the past. The system is capable of more so when a supercharged cobra started talking poorly of four cylinders I spoke up. Turned the Boost to 36psi and did two runs. Crushed him. But on the way home I noticed my turbos making a chatter. It's only happening when they are at vacuum. At about negative 5 psi it quiets and stops all together at 0. Then at 15psi my normal driving pressure it wont hold boost. Did I just make a really expensive run? Any suggetions?

 

I'm not too informed on the DCR TT setup, therefore I'm not 100% sure if 36psi is safe to run through them. With the DCR 2.6L stroker you have more than enough bottom end to support that type of pressure, but are the E01 turbos capable of handling it? When you dynoed the car at your stated 625hp, what was the pressure you were running then? And are you absolutely sure that the noise is coming from the turbo? Could you get a video of it while idling?

 

I was running 36psi for that dyno run, thats the max my bov will handle before it starts bleeding boost. I took the plunge and popped the hood to see whats what, and it almost sounds like the one of the turbos has a bent fin (if thats possible) or is out of balance, but its defenatly coming from the one of the turbos. Maybe I burnt a bearing out? Like I said I've got no clue how to diagnose a problem, but I do seem to have a nack for creating them. I'll try and get a video uploaded on youtube and let you know where to see it. Thanks for any help you got for me.--Darryl

 

Have you contacted DCR at all to see what their evaluation of the problem would be? That may be better than asking most of us on here since I don't know of too many people that have that kit (maybe a handful and most aren't members here). That was my first thought (bent or damaged fin) when you said that. If you take the intake off, can you take a picture of the turbo?? That might help...