b18c vtec

[aznstyler]

hey , guys i got a b18c, p-72 si vtec.
just wondering whats the VTEC crossover point? i think mine has been changed.. it kickings in about 4500? is that normal?

[Aydin]

vtir-/sir-g both vtec in the 2 ranges, 4400rpm is the first and 6000rpm or so is the second...

what your expiriencing is totaly normal! have a look at the stock vtir cam lobes and you can understand why there is such a low crossover.

[RR-04-RR]

A p-72 intake manifold come with 2 different runners and butterfly

VTEC will engage at roughly 4500rpm and then the second butterfly in the intake manifold will open up at roughly 6000rpm

See pic below

http://img522.imageshack.us/img522/8053/rparts6.jpg

[AXS]

when intake manifold is changed its still the same though...my mate upgraded to a skunk2 IM and the vtec crossovers remained the same!

[aznstyler]

No wonder.... i hear sound at 4.500 and i can feel gforce at 6 :) thanks guy!