high rpm stumble.
 

hey guys, when im racing my truck with my buddy or just driving really fast. like 80 in OD im running about 2500 rmps and about 25 psi of boost just running. the motor doesnt sound that healthy at them rpms. im thinking its a timing issue? i have a set of 4ks so its not defueling, plus im making plenty of boost. any ideas?

could be timing could be valvetrain could be pump coul be alot of things what do you mean by not to healthy?

is it more of a poping soind at about 3200RPM

I would say timing issue

yeah almost poping.
it just doesnt sounds clean.
idk how to explain it.
i think i need to bump up the timing on it.

dunno man; i could chip in and just agree with everyone else and make it sound like i know what i'm talking about but timing does make sense... at those rpms between injection lag and ignition lag it may not start burning until the piston is just starting to move downward... which would replicate retarded timing issues... sounds like everyone's spot on to me :U: