In VAFC there're VTEC unmatch fuel correction, has anyone know what that is, Thanks.


[Modified by evo, 12:06 AM 1/23/2002]

 

Its when you change the VTEC switchover rpm, you can decrease/add fuel to the rpm difference. Like if you set it to 5k, you can richen up those 500 rpms, since it would be leaner, since vtec would start until 5500 rpms. Sorry this is a crappy explanation

[Modified by civiksi, 1:46 AM 1/23/2002]


[Modified by civiksi, 1:47 AM 1/23/2002]

 

Thanks for reply! But only option is +-0% rather +-rpm, is that mean the percentage of the VTEC engage point?

e.g 5000rpm VTEC engage, if set +1%= 5000x1.01=5050, is that mean the fuel supply'll be 5000rpm = 5050rpm?
Hope you understand what i mean.

 

i thought the unmt fuel correction was the fuel correction for that rpm gap that your car will remain in VTEC... for instance, there are two settings for VTEC (VTEC cnt) on the V-AFC: 1) the rpm that VTEC engages during acceleration (L H), and 2) the rpm where VTEC disengages (H L)... now i thought that the VTEC unmt was the fuel correction rate between those two periods H>>L and L>>H...

does this sound correct?

 

Do u normally set L H in + or -?

 

i set it at 3%, however, i don't know if really did anything... i was told somewhere by someone that the at the VTEC threshold, there should be a little richer mixture b/c of the power spike, but the validity of that recommendation is unknown...

 

oh yeah, i posted this topic awhile ago... kind of the same inconclusive answer...
https://honda-tech.com/zerothread?id=90782