Dark_Sub_Rosa

Why does your ecu engage at 6100...? Factory vtec engagment is 5800?

Dark_Sub_Rosa

odd...

Gernby

Altitude can change the VTEC engagement point on the OEM ECU. I've read reports of people in the Colorado mountains getting VTEC at 7000. Here in TX my VTEC engages at 5900.

Dark_Sub_Rosa

that's interesting..... learn something new every day

ImportSport

Wow I guess I just thought that VTEC was engaged based on numeric rpm values not something pressure specific that could be dictated by altitude.

Gernby

There are several factors that the ECU looks at to determine VTEC engagement. If you are at light throttle, it will wait longer too. That's one thing that I didn't like about the V-AFC since it will engage VTEC no matter what, so if the ECU alters its fuel delivery based on a later VTEC engagement (high altitude, partial throttle, low coolant temp, etc.), then your AFRs will be way off.

Dark_Sub_Rosa

ahhhh.....so thats why when I'm at light throttle and punch it like the VAFC says VTEC and my car takes a dump

Gernby

sebrings2k

is it set on 4cyln?

Dark_Sub_Rosa

If it wasn't on 4 cylinder I would have more problems than this minor throttle thing.

Gernby: sorry to confuse you on that last post. I think your onto it with the open and closed ecu stuff. I gotta reset all my radio stations now though after I reset my ecu...