So I've been trying to learn the logics behind how the VTEC mechanism engages and I though you guys might have some insights. I've read about how VTEC works, I've seen the videos, and I've experimented with it myself. My question is how do I get the VTEC to engauge consistently? I think it can be done without a fancy VTEC controller, a little skill and finess perhaps.

Typically flat out my VTEC does not enguage in first gear, and activates at 6800 in 2nd, and 5500 in third. This is petal to the floor acceleration. Sometimes though it does enguage in first and second just like I want it to.

I can prime the vtec ie. rev it up to 5500, hold it for a second, then punch it, and the solenoid activates in any gear every time. I can take a courner punch it on the way out of the curve and the VTEC activates.

Any ideas on how to introduce activation consistency into the mix without a controller?

 

Seriously?

Assuming oil pressure is good and you have no CELS, VTEC will engage at ~5200rpms (depends on your car) at WOT.

Listening by ear is not a good way to determine that VTEC has, infact, engaged.

 

I installed a VTEC light connected to the ECU so I can see when the solenoid is getting the activation signal. From reading and experience the VTEC mechanism is activated by factors in combination with RPM and not just RPM alone. I would be interested to know all the factors the ECU takes into consideration for the activation of the mechanism. I don't know if its just RPM and oil pressure.

 

lol...sorry man, but it doesn't vary. Maybe your "VTEC light" isn't wired right.

VTEC needs oil pressure, RPM, In Gear, WOT (I've heard 85%, not sure if that's at all legit though on a stock ECU. Though that's how my Hondata is set), and then the ECU will engage the VTEC solenoid.

 

Maybe there is something wrong with your oil pressure.

 

whats WOT for the slow thinking?

 

Wide-Open Throttle... you know, pedal to the floor.

And sorry, man... but everyone's right... it's not going to vary. And sov, I thought it was 4800 on a z6/y8? idk, maybe I'm wrong.

 

i thought it was 5400 on a y8

 

when your oil pressure and rpm is at the correct timing, your VTEC will engage. Just give it a little throttle and when time is right your VTEC will engage. Btw you cant always try to hear it by ear, it doesnt work like that

 

Does anyone know the oil pressure threshold for engagement? Now I'm wondering if something is wrong with my motor.