1bdasvt

What's a good air/fuel ratio for a FI vette under boost.

Thanks

nw07heavy

In my particular application using the ATI Procharger P1 system (unmodified) on a stock LS2 engine, 11.8:1 when in boost yielded best HP (510rwhp) and drivability, without ANY knock induced timing. This tune was done for 91 octane California gas. Car has only a ported stock manifold and Magnaflow cat back, and is otherwise stock. Headers (and maybe heads and cam) are on the way, so I will have a chance to see how this will affect A/F ratio, and what adjustments will be needed.

Mr.Big

high elevens at most here...

1bdasvt

My dyno was at around 12.56 to 12.42?

peter pan

Mine is between 11.5-11.8 and seems to be just right on my setup

1bdasvt

Thanks Guys!!
Guess I'll have to have mine adjusted!

thomas walters

A/F @ 12.4 on a very conservative tune.

1bdasvt

So in Your opinion Tom,12.4 -12.5 is not uncommon?
I would like a little more RWHP,and I'm mixing in about 5 gals of 100 octane with each tankfull!

Brabus2

Is this a reading from wideband 02 sensor plugged into the 02 bung on one of the headers, or tail pipe sniffer?

1bdasvt

Richard,it's from the sniffer!

peter pan

I would add an ECS Alky Kit and tune for 11.5-11.8 as running meth is so much cheaper than that 100 octane fuel in every tank. I go through about a gallon of meth every other tank, it is $4 a gallon here. It also lowers the IATs big time, raises the octane and keeps the internals clean. I have had my kit on for 4200 miles and my car runs better now than when I had it tuned at 1k

Brabus2

Geroge, have Doug check it on the wideband for accuracy.

1bdasvt

Thanks Richard,and all other folks!!
Merry Christmas!!

Brabus2

Merry Christmas to and your family George...

BTW: Did you receive the APS TT kit I sent you for Xmas, geewiz I hope it didn't get lost in the mail...

1bdasvt

Thanks Bro I did receive the APS kit!
I'm adding it to my Maggie set-up!!