installed skunk2 stage2 cams in my b16 and now i have a problem engaging in vtec. right at 5500 rpm it boggs and falls on its face... any help out there?

FYI
I have skunk2 valve spring and retaners. the head has recently been machined and im also running a skunk2 intake manifold. stock intake and exhaust.

Any suggestions or advise is welcomed

 

It needs a tune if it's still on the same tune from before you installed the cams.

 

when they tune it.. what do they adjust?

 

A/F,timing,etc.

It won't run right without a tune, and I wouldn't suggest doing it yourself unless you know 100% what you're doing.

 

i see. I didnt know someone is able to adjust the A/F without regulator or vafc or something like that

 

vafc is junk.
It really shouldnt be bogging out with that setup on the stock ecu. If you want you can have your ecu socketed and chipped with a basemap(If obd1 92-95) according to your mods from a tuner. Like John Vega(MTber), Alpha, Jap, or Neil. What year is your car? What chassis are we speaking of? Any other mods? The more info you provide, the more it looks like you want a real answer. I suggest you read this Phearable.net - Electronic Fuel Injection Tuning Solutions - Hondata, Neptune, Crome, Uberdata, Ectune, AEM, Honda Tuning, Widebands, Fuel Pumps, Intercoolers, Turbos, LS/VTEC, ECU Chipping, Chipped Ecus, P28

 

besides the mods mentioned above i also have a header and cam gears. The car is a 2000 SI.. I've been given theories on the cause:
1) it could be a build up of back pressure due to the stock exhaust (?)
2) ecu error... (but i doubt it because it worked fine before the installation)
3) its normal to run poorly before its tuned after installing big cams.. (?)

Why is the vafc junk?

 

VAFC is not junk,i cant stand when people say this..

If you have a VAFC PM me i will show you how to use it. The vtec cross over is going on and off because of the bigger cams. I had this same problem with my crx a long time ago,tuned it on a VAFC and it was gravy.

 

ok. i have one but not installed... wanted to find out if i shoud

 

They aren't as bad as everyone says they are but they also aren't as good as a real tune. You can use it fine to fix your problem and still pull out some extra power.