Like it says.....I am not driving it too much right now but will get it tuned next week hopefully.

 

Yes it can most definately help.

 

make sure your car is runing rich... then tune it.

 

here's my corrections with a Wide Band sensor and VAFC2:

A/F




VAFC2:

 

Lucky for you a VAFC will only let you lean the mix, so yes it will definitely help .

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C-Rsi &raquo;</TD></TR><TR><TD CLASS="quote">Lucky for you a VAFC will only let you lean the mix,.</TD></TR></TABLE>strange... from the above graphs and from my use the vafc.. it will allow you to richen the a/f ratio.

 

You can lean it our and equally you can also richen it. From the graphs it still looks a bit on the rich side above 7krpms.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Willard &raquo;</TD></TR><TR><TD CLASS="quote">strange... from the above graphs and from my use the vafc.. it will allow you to richen the a/f ratio.</TD></TR></TABLE>

Your very right....i have personally never used one but had been told time and time again that you could only lean your mix and not richen it!!! Good to know .

 

VAFC's will let you richen a mixture slightly, but not a whole lot. It is better to raise the fuel pressure to increase the a/f mixture if you are only tuning with a VAFC and then subtract the fuel from the settings. I am guessing that you can only "trick" the map sensor so much before you can't add any more fuel through a VAFC.

 

You can richen but only to a certain point as the MAP sensor senses boost.