Just installed Skunk2 Tuner2 cams and valvetrain and my AFR after vtec reads rich, only pulls hard after 7500 rpm what could be the cause of this, wouldn't it be lean?


My setup is 99 civic si
JDM B16
AEM wideband
96 spec ITR headers
Yonaka Catback
Vafc2

 

Are you positive the cams are installed correctly?

 

On a basically stock b16 motor, your going to lose mid range power with those cams over stock cams.

 

What other way would I have to install those cams?

 

Your right my low end feels normal, 5000 to 7000 rpm feels slow, only after 7k that's when it really pulls hard, I've already taken away 15% fuel at 5k-7k my AFR are now 12.5 consistent at full throttle, b4 just as I hit vtec my AFR were 10.1 running rich from vtec to redline
Should I move my vtec crossover higher?

 

What is your vtec crossover at right now?

 

Just make sure the cams are degreed properly. They could be off a tooth. However most likely not. Those are some big cams for a stock motor. The best way to do it would be to put it on the dyno and play with your VTEC crossover and also the cam gear timing to see what your engine will like best.

 

Try advancing the exhaust a few degrees and retard the intake 1-2 degrees. Vtec should be 5600-5800ish

 

Vtec crossover is at 6000 rpm, at least that's what my vafc2 info reads, on my stock cams was 5700
The guy I bought these cams had cam gear setting intake 4deg advance exhaust 6deg retard and his motor was stock b16
Still should I move my vtec cross to 6500 rpm cause that's when it really pulls
Right now when my vtec hits it feels like it bogs then picks up really hard

 

Yeah sorry, I ment advance intake and retard exhaust.

 

The only way to know where vtec should be set is by using a dyno