E
Endless
Guest
hi all, just got my Power FC installed and tuned by a shop a month ago on my S15 Spec R, boost is set for 0.9bar low and 1.2 high (stock turbo). After the installation, the tech there told me that the previous guy that did my oil change had put way too much engine oil and therefore my car might feels a little stumble once in a while (is that possible?), anyway, been running for month and the car seems fine and response is good (water and oil temp are normal), however, i would feel the car to be stumble for a short time whenever in higher rev (from 5000 - 7000rpms) when I'm on full throttle. And today it got worse, and I can almost feel the engine knocking sound at high rpms for few times, check the knock level on my FC commander and highest record is 75, is that a big problem with it and what are the possible causes? I'm going to bring it back to the shop this week to check, but just want to know some possible causes in case they BS me, thanks guys.