i have a autometer air/fuel ratio gauge in my car and i know most people say that they aren't accurate but anyway... i have noticed that when i am driving on the highway in 5th gear and floor it, the car will accelerate but then when it gets to about 4 or 4500rpm the gauge will go from 3 green bars ( rich ) to the last red led's on the other side ( lean ). i pulled out no.6 plug and it was alittle white not alot and i have had those plugs in there for about 3 months or so.
i have a walbro ( *spelling ) 500hp intank pump and a Apexi BOV.. most people with this kind of mods are running rich as hell.
also the car will backfire sometimes.
its a RB20DET 4WD so if anyone has any idea's that would be great..
other mods are 3" turbo back exhaust, pod with CAI and thats about it.
Thanks guys