artec12

Hello! Does anybody know under which conditions (RPM and MAP) does the vtec engage in the AP1? I need this information for lowering the vtec engagement point.
Thanks!

B serious

MAP doesn't affect VTEC. And engagement RPM is about 6k. Not sure why you'd need to know that if you're changing it anyway....

Deleted03.15

Less than three temperature bars should also prevent vtec engaging like a lot of turbo-charged engines which restrict boost for the same reason.

artec12

I am using a piggyback ecu so I need to know when the ECU thinks its not in vtec to add ignition timing. I am pretty sure that MAP or TPS affect vtec engagement.

Deleted03.15

MAP 02 sensor cel will always put the ecu into 'limp-mode' if not working properly.

thomsbrain

VTEC only engages over some TPS point, but I don't know what point that is. But it's definitely not engaged when you are off the throttle, and definitely engaged at full throttle.

artec12

Thanks! since noone seems to know the exact point I guess I should test and see.

flanders

Which piggyback are you using?

steelers743

Might have more luck posting this in engine management.

Not sure for AP1 but AP2 06+ stock tune according to flashpro is:

VTEC RPM Window: 5900-6400
RPM 6000 6100 6200 6500 6700
MAP 0.869 0.869 0.735 0.541 0.541

artec12

I am using the Emanage ultimate


Thanks! Any idea what's happening after 6700 rpm?