I just tuned my 2nd gen b16 at church's and was kind of disappointed. Hopefully someone here has an answer to my problem.

I have the following: AEM Cai,spoon 70mm t-body,itr intake manifold,aem rail + regulator,dc 4-1 header (extremely banged up on bottom),hollowed cat,tanabe cat back exhaust,mugen chip ecu with apex vtec controller.

Here's the problem: I got it tuned and it had equal power and torque compared to my 1st gen with stage 2 cams until 7000 where power just stopped, it put out 153hp and 113tq My question is could my banged up header be causing this problem? Church knows what he's doing and he suggested it may be the header. THe exhaust was ok and so was the intake. Any suggestions? Thanks ahead for the comment.

 

well the power sounds about right at the wheels. but dropping at 7k rpm i dont know?? **** if ur hittin max power at 7k sounds good to me! set ur vtec lower so u stay in it. less time cause less rpms. could be the chip. cause the b16 cams arent exactly "crazy" i bet that chip would react really good to ctr or itr cams. but the 7k rpm thing seriously have no idea! i mean who knows if somethings wrong, or if u were gonna make power up high rpms anyway?

put it this way, would u rather make 153 hp at 7000 rpm or 153hp at 8000? change the header if nothin changes then gotta be the chip

 

Those hp numbers are on a dyno pak. So it's 8-10 less if i did it on a regular dyno. The vtec doesn't shut off either. I'm hoping it's just cause the header is extrememly banged up.

 

vtec is always on? that doesnt sound right. exhaust back pressure shouldnt cause that. musta thrown 6qts of oil in ...

 

I meant that when vtec activates it doesn't shut off during the pull. Sorry bout the confusion.

 

well it shouldnt shut off during the pull?? unless u go under a certain rpm, oil pressure goes up, have different cams, have different ecu, then it should be where ever the stock b16 activates.

 

it sounds like you're running the wrong chip for your motor setup. a mugen chip is most likely for a motor with itr cams +, not for a stock b16. a banged up header would cause a difference of about 2 or maybe 3 hp. also you definately don't need a 70mm throttle body. was your throttle body portmatched to your intake manifold? if not, that could cause your power to be lacking. if air comes through a 70mm opening, it expects to pass through a 70mm opening. if you didn't portmatch, you've got air coming through a 70mm opening, then hitting a brick wall 360 degrees around the outside bore of your intake mani, cause that opening is only 62mm. thats gonna cause a lot of turbulence in an area where you don't want turbulence. its gonna slow down air velocity. i bet you would pick up power with an undented header and a 62mm throttle body. the chip sounds like the most limiting factor tho. you don't need an all motor program. you've got a stock b16 right? why use a chip meant for a built motor? (bolt ons don't count as motor building)

 

My manifold is note bored out to match the t-body. What confuses me is that my friend with the same exact setup minues the 70mm to a 62mm and a undented header put out 160 on a normal dyno aka the roller dynos. He has the same ecu and everything. I guess I will just have to get a header and see the difference.

 

Just go turbo