Well after my engine reaches 6k rpm i get a vibration / breakup. The thing is it only happens under boost. If i let the rpm go up with no boost ( very slowly ) it doesnt happen. I think it may be bad grounds, since i've heard that bad grounds can cause alot of problems. The thing is i watch my boost and it's good and steady and my knock is fine never really goes above 46. So if someone could show me some diagrams of where i can add extra grounds and up-grade my current ones that would be great. I plan on just goin out and getting some thing like 8 gauge wire and making my own. I dont know what else this could be. I'm not goin lean, and my knock is low, and boost is steady. I know i have a secondary injector leak but i allways had that and never had this stutter / vibration. The only thing i added was a ACT leight weight flywheel. And i figured if it was out of balance it should affect it before 6k and if there was boost or not. Sorry this is so long.

It may be bad tuning in that area of the map. It could also be ignition breakup

yeah, who did your tunning anyways?

sevenspeed, it's pretty much a base map, no doubt that could be it thou.

I still want to up-grade all my grounds so does any one know where i put the extra ones at?

HKS twin power

Veilside has a real nice kit. Pricey around $240. You have to call to order it though.

How rich are your AFRs? If you have a stock ignition and are running a rich mixture it may cause high rpm breakup at around 14psi and up.

That stuff is BS. Go to the auto parts store, buy some grounding strap, and replace the stock ones around the car.

IGYpoo!