Hope this all that stupid of a question. I want to add some fuel to the a/f ratio during wide throttle above 5,500 rpms. In the settings mode -> Wide Thr, am I adding air to the mix (so I would want to go minus to add fuel) or am I adding fuel (so I would want to go plus to ad fuel)?

It confuses me since the manual refers to Setting the air correction factor.

 

you are adding fuel- go to plus in yourspeak

 

Not that I doubt your skills but maybe you should get on a dyno for proper results?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bbasso &raquo;</TD></TR><TR><TD CLASS="quote">Not that I doubt your skills but maybe you should get on a dyno for proper results?</TD></TR></TABLE>

I'm no tuner...

I have had it tuned, but it was way too lean in the 5500-6500k rpm and I was getting a CEL at those rpms. I have an appointment to get it tuned again at a different shop next week, but I wanted to add some fuel in the meantime to be safe and see if i could get the CEL to stop coming on.

 

Honestly, the VAFC is not going to do much in terms of adding fuel

It works decently to take away fuel however, if you are currently lean in a certain area i would recommend adding fuel by raising fuel pressure. Then when you go abck to tune you can take away fuel as needed b/c the vafc is much more efficient at taking away than adding. Just an FYI

 

When you're adding fuel, you're increasing the MAP sensor input voltage to the ECU. You can only go so far before you exceed the voltage limit and throw a MAP sensor code (3).

That's what's happening when your car throws a CEL. It's probably not gonna do much to add more fuel with the VAFC anyways, and if you have an adj FPR, it's not recommended to exceed 60psi of rail pressure.

It's hard to add fuel on the WOT adjustment map b/c the fuel basemap in the ECU only has so much to work with b/c during WOT it's already using the last two or three load columns, which means you can only go up another column or two before you run out of fuel map. Beyond that last load column, I'm not sure if the stock ECU goes static, but when I last used a VAFC on the dyno, adding fuel didn't seem to do much or anything at all, no matter how much was added. We ended up maxxing it out somewhere around +18 I think before it threw a code.

All VTEC motors have a high VE region at that 5500 to 6500rpm range, so it's pretty hard to enrichen and flatten out that part of the AFR curve without bigger injectors. I'm not sure if you can tune it out on stock injectors with a Hondata, but I've seen a chipped ECU exhibit the same condition with stock injectors, just not as lean.