did engine swap on my 94 delsol.Was 1.6 now its a h22a .Car has all kinds of tourqe,even had to buy racing axels.I snapped the first ones in it.My problem is v tech is suppose to kick in at 4600 and when its luke warm it does and the engine flat out screams,But when the engine is hot it kicks in at 5600.Could the problem be the o2 sensor, need larger fuel pump, vtech sensor.Im lost I need help.

 

which ecu are you running?

 

the h22 ecu from a prelude

 

from a 93 prelude engine and ecu swap

 

IT'S VTEC, there is no H!

I don't think the problem is your O2 sensor, are you throwing any codes?

What is the CORRECT rpm VTEC switchover for the 4th gens? 4600 or 5600? My 5th gen 97 is 5200??

U don't need a bigger fuel pump. don't waste the money... It's not the problem anyway...
The VTEC sensor must work, or else the VTEC wouldn't work at all...

Sounds like wiring problem...

 

what did you need to do to swap the engine

 

I thought vtec engaged at ~5600 in the h22.

 

You may need a new oil pressure sensor. Cause once it gets hot, the oil thins out more and you maybe not be pushing enough Oil PSI for VTEC to engage until higher RPM's.

Not sure, just throwing an idea out there.