Maxed out 550's?

Maybe that boost creep could be part of the problem. If the ECU is only seeing 1/2 throttle, maybe its using overly aggressive timing, not to mention the low duty cycles on the injectors that cause you to jack the AFC up so high. I would fix the boost creep first, so you could run REAL wide-open-throttle logs and see what happens. If this is whats happening, I think 660's will only make it worse, even more aggressive timing advance.
Just another guess.......
Jeff O.
#1886/2000

 

RRE kit(spearco)John[This message has been edited by khadiyev (edited 08-22-2002).]