vtec engagement

[FR33K]

my vtec engagement point seems to have dropped from 5500rpm to 4900rpm after i installed a short ram intake.

anyone know why the change is so dramatic ? :confused:

[GSI-PSI]

probably cos u took the stock airbox out and the heat from your engine bay is gettin in ya ram. *tip, put ya ram inside ya airbox and run cold air intake 2 ya box. more power dude.

[spoondc2]

Just wondering how do you know your vtec engagement point has been dropped?

[FR33K]

coz i can hear it ?
im pretty sure it hasnt always been like that
actually im positive

[spoondc2]

coz i can hear it ?
im pretty sure it hasnt always been like that
actually im positive

I see.......... you mean the change on tone?
I am not sure, something about oil pressure?

[tinkerbell]

the ECU you have engages VTEC at ~4800rpm

it is a first gen JDM PR3 ecu and this is where VTEC kicks ;)

[tinkerbell]

re-install your old air intake,

hook a 12v lamp in parallel with a ground and the VTEC solenoid active wire and see when the solenoid activates...

[tRipitaka]

my vtec engagement point seems to have dropped from 5500rpm to 4900rpm after i installed a short ram intake.

anyone know why the change is so dramatic ? :confused:

possibly never changed ?
just clearer to hear when you put the new intake in.. ?

[FR33K]

the ECU you have engages VTEC at ~4800rpm

it is a first gen JDM PR3 ecu and this is where VTEC kicks ;)

well that explains everything lol although ive never heard of these ecu's.
i used to think it was engaging earlier but after reading everywhere that it was 5500 then i just believed that i was hearing things.

[tinkerbell]

yep, only the 1st gen JDM B16A's kick in below 5000, the B16A2 and B16A3 crossover at about 5500ish