a little after hours tuning session looks like I am making a little more power

oh yeah 700 hp 523 torque

better yet that is only 11.7 a/f yeah there is more left in it

Is that with a blend of E85 or is it just the straight up stuff out of the pump?

In either case, GOOD JOB!!!!

Nice work Trent!

Another E85 related question...
What size injectors are you using on that thing?

full e85 It just flat out rocks, and 1600 fic injectors, and thanks

What kind of AFR are you guys shooting for with the E85?

right now we ar at about 11.7 a/f

Congrats! That thing is ready fly!

Do you offer any weekend dyno testing?

yes we are open on saturdays from 10 to 6 sometimes later.and whenever your ready to schedule just give us a call.

Some of you are probably thinking he's running terribly lean, given that stoich for E85 is around 9.7:1 or so.

The thing about most widebands is that the AFR they display is based on whatever fuel the unit is programmed to work with. O2 sensors just measure the amount of leftover oxygen and calculate the AFR based on how much fuel it would have taken to reach that percentage. If you're using a WB calibrated for gasoline, 14.7 will be stoich for any fuel you use, and around 11.5 to 12.5 will be a good AFR for boost, no matter if you're using methanol, ethanol, e85, propane, unleaded, race gas, etc.

The 'ideal' amount of leftover oxygen in the exhaust doesn't change just because you've changed fuels.

I was really aiming to see what the 'safe' limit of the fuel is, because I normally tune for 11.5-11.8 on pump gas and when I switch to race gas its around 12.5......given E85's much higher octane rating, I wasnt sure if they were shooting for over 12's or what...

I've been looking at doing this for quite some time now. It's just the matter of comming up with the money to get it going. I'm planing on running 1000cc primarys and 1600cc seconarys. According to the math I'm going to be close to the limit with the air that the GT4202RV can move.

Here is the formula for any fuel.


sAFR = (%ofAdditive * sAFRadditive + (100-%ofAdditive) * sAFRgas) /100


Also this is a simpler way..
Take E85 for example..

sAFR = .85 x 9 + .15 x 14.7
sAFR = 9.855

And for calculating from a known 12.5 FAR to what you would need to run with a blend...
Again E85 as an example..

FAR= (12.5/14.7 ) x 9.855
FAR= 8.380