I apresiate you chiming in on this but I do belive what your saying is not even close to accurate. First off you own a Ap2 so you should really be paying attention to your car and what it does. If your vtec is ingaging at difforent rpms all the time, not being consistant in other words, then you have something wrong with your car. There are very i'll freaquent times when the engagement can change slightly, like changing aultitude for example but not more then a 100rpm or so which is not precievable unless you are really intune with your car which you apperently are not. Second- Vtec on an Ap2 kicks in aproxametly 5500 I do believe. i'll have to ask my freind his exact rpm, it might be 5600. Any of you Ap2 guys other then this one can chime in here on this. And third I especialy hold this true with an Ap2, vtec kicks in hard and will show an emediate spike in the power on a dyno graph as this one does, it clearly shows that it kicks in at 6200rpm. When i dyno'd my Ap1 it showed a spike right at the engagement of 5900 which is when the Ap1 Vetec kicks in. So again i would like to know what this guy has done to his car. Its possible that its not running properly, it shows strong upper rpm numbers but has severely low tq numbers all the way to 5500rpm which is what looks so strange. His tq curve should be flat from 3500 to 5500. V2 is a costly intake but its still a hot air intake and it may be causing these low tq numbers down low. Heat soak may also have been a factor with his hot air intake. Go back to stock man with a KN, you'll keep your high hp numbers but get your low end tq back to where it shoud be. The factory intake box is tuned to your motor, get your response back.

 

nope that dyno looks perfectly fine for an 04. Vtec kicks in right around 6000 rpms just like the dyno clearly shows.