Vtec Engagement!

[pgclee]

Wats the Different between a Low Rev Vtec's Kicks in and a High Rev Vtec Kicks in??

Low means 4500RPM kicks in...
High means 7400RPM kicks in...

any answer?

gimi some knowledge people...
wanna hear what people will say...hmm...cause i have no idea...hehe..hmm...hehe...

[bizee_1]

umm hmm.....about 2900rpm ?!? :P
what exactly do you mean ? using standard cams, ecu, engine etc ?

since we're on topic...is it possible to change the engagement point ? (using stock ecu, no vtec controller) ie: header, full exhaust, gear ratio's, bad sensors etc....

gimi some knowledge people...

Johnny 5 need INPUT ! (Short Circuit)

[2ds]

the current vtec cross over point as set by honda is optimal you will lose power if you change it even a little bit.

-2ds

[bizee_1]

what is the current optimal cross over point for stock B16A ? (5500rpm??) and what is considered "even a little bit" ?

as my xover point is approx. 4700-5200rpm. have done i/h/e.

[[[d a n n y]]]

mines not 5.5 spot on it's abit over 5.7 or 5.6 dunno mayb i am mis reading it

[Kit]

the exact vtec engagement point can vary slightly.
it relies on factors such as throttle position, oil pressure, engine temperature, engine load etc etc.

but under WOT, it should be in the 5600-5800rpm range

[2ds]

what is the current optimal cross over point for stock B16A ? (5500rpm??) and what is considered "even a little bit" ?

as my xover point is approx. 4700-5200rpm. have done i/h/e.

that's definatly enough to lose power. don't even think about changing the x-over without dynoing the car on both the low and high cams and comparing the dyno sheets

-2ds

[Civic Type R]

mine is at 5650rpm. - stock B16A.

[bizee_1]

Hmmm....i understand what you guys are saying.
[/b]
If you look at these dyno runs.
Look at, around the 120kph[blue] & 140kph[red]. (or is it 105 & 110) You will notice that VTEC engages earlier.
The only changes i had done in between before & after were, cat back to full exhaust, and a change of plugs.
My mechanic told me the change of plugs i got done elsewhere, were the wrong ones. And he changed them again.

But still, VTEC engages at the same place WOT.

[pgclee]

nobody seems to answer me question..

not using standard cams and not standard ECU

[Kit]

pgclee, i'm not quite sure what ur original question meant

[geo41e]

it hink he's talkin bout his power bands..??
low vtec kick in ? where u hear that from ?
theres only one kick..and thats when vtec hits full stop

however the NSX is different..got like..3 owerbands,,and 3 diff engine note
love that sound!