can i tune the vafc myself by looking at the dyno sheet?

this is with pulley's, cai/h/e


Modified by luap at 3:09 PM 10/26/2004


Modified by luap at 3:10 PM 10/26/2004

 

What is your question?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VRDrvr &raquo;</TD></TR><TR><TD CLASS="quote">What is your question? </TD></TR></TABLE>


he wants to know if he can tune the v-afc by just looking at his dyno sheet.
I'm not too sure if you can but the best way is on a dyno.

 

thats how we tune
looking at the dyno plot after the run.

but u ill need to do a run after u make ur adjustments to see the out come

if thats a sae dyno jet number its really good if its not a itr

 

i dunno, maybe im blind, but i cant see the #'s real good; but it looks like you could lean out a little up top.

 

how exactly do i do that on the vafc. which settings do i go to?

 

u should really read the manul
first

 

you can tune but you really need to be on the dyno to do it. You really just need to get the air/fuel leaned out a bit. Ideal for n/a is prolly around 13.0 -13.5:1 a/f ratio. (but u tune for where the power is, a reason u need to keep dynoing while ur tuning)

Also, you can adjust the vtec engagement to be a lil smoother aswell.

You really need a dyno and a wideband o2 to tune it properly.

generally if your talking stock fuel pressure about 5% lean on a vafc would raise the a/f ratio about a point. You could take about 4-5 percent away and that might net you some power but i would rather u do it on a dyno.

 

where do i go to on the vafc to lean it out???

 

off of vtec
low cam under wide throttle
in vtec
high cam under wide throttle

u will see the rpms
just add and subtract as needed

 

hey thanks alot for your help

 

I adjust mine under [setting] ---&gt; Wide Throttle

 

when would u adjust anything under the narrow throttle setting?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by luap &raquo;</TD></TR><TR><TD CLASS="quote">when would u adjust anything under the narrow throttle setting?</TD></TR></TABLE>

When you want to adjust at partial throttle, when you're crusing. You can adjust it for fuel economy when crusing, but for power when at WOT. This is the way most people tune them.