Do you have a method of checking the short term fuel trim (STFT)? See what the fuel trim is doing when the car goes lean.

 

what intake do you have? Just curious.....That could throw MAF off and lead to headaches. Just a thought?

 

Dsport magazine recentely had an Intake Manny shoot out for the evo 9 and discovered that actually most aftermarket intake manifolds loose driveable whp and tq.

They discovered that the best results came from the stock manny and the HKS kansai intake manny. I cant remeber the residuals too clearly but i;ll see if i could find that link for you.

http://www.dragsport.com/issue/2008/0508_toc.shtml

thats all i could find.

I was under the impression that you start swapping out intake manifolds once you plan on running close to 500whp??? Am I wrong

 

That really sucks. Goo info I was gonna get mine ported. I guess not anymore
Good luck !

 

Did this ever get resolved?