Hey guys and gals,
About 9 months i got my baby, 1 of 2 dream cars, an r33 gtr (others a ford gt40... yeah i kow i can dream) anywho after a couple of months i found that she'd misfire at around 5k under max boost at stock, so after savng abit i took her to c-red and forked out abit for a haltech cpu and tune and it seemed to fix it, turns out it was missing the air filter plug thing and only one of my 02 sensors was working... Feeling confident i was fixed they bumped it up to 14psi on stock turbos and a remap. Dyno'd at 340 atrw:)
Noticed around a couple of months later that she was doing it agan, 5k under boost, mainly 2/3rd gear, nice jerk:( did a bit of study and found that the coilpacks can be a good cause of the problem, so i bit the bullet and got the mighty splitfres, cant go cheap on these beasts:D
Anyway today after the install drivin down row, changed from first to second, hit 5k again and to my dismay she jerked... WTF could it be, and it always seems to be at the 5k mark...
Things runnin through my mind:
- spark plug gaps
- too much boost on stock turbos
- too much exhaust gas for the stock exhaust...
Does anyone have any experience in fixing this and co0uld possibly point me in the right direction??