Vtec Crossover

[Vipers4Life]

I have a 1999 accord lx sedan I4 Ulev AT (F23A4 motor) with an AEM SRI. Does anyone know what rpms vtec is suspose to engage? Im having trouble finding it.

 

[CG6Lemon]

is it the performance type or econ type of vtec? for performance i think 4-4.5 and econ is 2-2.5?

 

[Vipers4Life]

Ulev is the econ but i took it for a short drive around the block and left it in D2 but couldnt notice a crossover sound i went to like 1-4.5

 

[CG6Lemon]

well u can hear ur engine get a little louder and ur car will sort of jump forward a bit. Not jerking but u can feel a push.

 

[Vipers4Life]

do i have to be full throttle or does it not matter?

 

[Totalimmortal]

There is no performance and econ VTEC for us. It's all economy. Period.

VTEC = RPM + Throttle position + Oil pressure.

 

[CG6Lemon]

^ ooo i learned something new. this is y i love this site. hehe

 

[AFAccord]

With all the right circumstances (ie. enough oil pressure, speed, and WOT) VTEC will engage ~2300rpm. If you're babying it, it could engage as late as 3800rpm.

^ That last sentence doesn't make much sense for an auto, I know.

 

[atarikid07]

To really hear Vtec, I usually gun it. Not necessarily full throttle, but maybe liek 3/4 or 4/5 pedal is enough to make a difference.

Mine jumps in at exactly 3500, every time. Never fails

 

[Dinzdale40]

try removing your intake resonator...it will make any change in the cam profile more noticeable sound-wise