Sputtering
 

I've had this problem for almost a year now and can't figure out what it is. I have a 6spd manual, greddy turbo (7psi low, 10.5psi high), interceptor emu, upgraded injectors and pump, koyo radiator, and the mazsport cooling fan mod. Now this doesn't really happen all the time, it kinda comes and goes. When i'm in high boost and at full throttle the car will sputter after 7k. It will sputter and then pull for a few rpm and sputter and then pull again, untill i either shift or let off. Afterwards my engine light will flash. This never happens in low boost. At first i thought OH SH*T I've blown the engine...but the car still runs normal, no leaks, starts normal, drives normal. So i assume the motors not blown specially considering that this dosn't always happen, often it just pulls like it should: smooth. So what's wrong with the car?

You keep doing that and it will be blown. From what I've read that turbo doesn't perform to well at the 10 - 11 psi range especially over 7k. I'm sure you can find something on the forum related to your issue. I'd just set the high to 9 psi and see what happens. If that solves your problem leave it alone and be happy. I really don't care for greddy turbo kits cause every single person I know who had one either rebuilt it after a short period of time, their car ran like crap or sold it just like a lot of ppl on this site have....good luck.

Well if it's the turbo then i'm not worried. I'm going garret soon anyway.

it couldn't be by any chance the ignition going out could it?

very likely coils...

beers :beer:

Try going into high rpm without a lot of throttle. If it still does it,it could be coils or mapping.