Hey guys, what air fuel do you tune for under vtec?

General rule of thumb

I'm not planning on taking this to a dyno anytime soon, I just want to fix the massive amount of black smoke that comes out of the tail end of my hatch when its under vtec.. Currently its 12.4:1 under load, when we tuned it 2 years ago we never spent much time playing with AF ratio under vtec I was just told "it should be here for most power" and we didn't do many pulls.

--Aaron

 

All motor vehicles: 12.9-13.4:1 (Full Throttle)
Forced Induction Vehicles: 11.2-12.0:1 (Full Throttle)
Partial Throttle/Idle: 15.5:1 (Light Throttle) 14.7-13.6:1 (Partial to Mid Throttle)
There are many small variables involved in targeting your air/fuel ratios, the main idea is to ensure you are not running too rich or lean & making the safest & best power possible due to maintaining a proper amount of fuel to your motor at all times.

 

Ahh good to know,

I'd imagine the window for it making power is a semi wide window before HP starts to fall off on either end of the A/F spectrum right? Ignition timing is probably more critical at those points.

Thanks for the info.

--Aaron