My friend has a 99 Civic SI with a fresh JDM B16A swap. The VTEC crossover is very loud but the car seems like it does not pull any harder. Maybe even a little weaker through vtec. Anyone have any ideas? We even tried a different P28 and tried different basemaps but nothing seemed to help.

 

any check engine lights? any idling issues?

 

What kind of exhaust are you running?

 

i have the same problem, my CEL is vtec switch and egr, idle is bouncey sometimes

 

You've tried different basemaps?
hmm...

what RPM do you have VTEC set to engage at?



You just answered your own question (well, not directly a question, but it felt implied). Fix whatever the CEL reveals. It's quite obvious.

 

https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/vtec-engagment-2528987/

I think you guys should trade

 

Sounds like a typical b16.
VTEC sounds like an atom bomb but still only has what 114 ft lbs of torque or something close to that.

 

about 4800 rpm

 

Why? First, you should put it back where it's suppose to be which is something like 5300-5500RPM.