50/50 E-85 and 92 octane - Page 3

santa · 10-04-2006

I have been running 100% e85 daily(about a month now). The last time I dyno'd it put down 465whp on 21psi(90 degrees in our shop). I can tell a difference between the E85 and 92. I like the way the car daily drives on 92 without a doubt, but for racing E85 pulls pretty good at 22psi. I can't get much more out of it as I'm maxing out the 2g mas. My mod's are: built 2.4, fully ported head, 1mm oversided valves, scm 61, afcII and I've got a 255, and rc 1000 cc injectors. massive front mount (core is 26x12x4!), 3 inch intercooler piping. blah blah blah... E85 rocks for a cheap form of race gas!

TalonFiero · 10-04-2006

Quote:

Originally Posted by Shane55113

Ok cool, i will try the 50/50 tmrw. I have 650cc injectors i bought them oversized so i could try e85 on my E316g i have never gone over 65% duty cycle in wot so i think i'm safe.

What is your global fuel set at currently, I am going to guess around -29%? I wouldn't go any leaner than around -18%-19% on the global with 650cc and a 50/50 mix. Be sure and watch the duty cycle from there. Good luck!

Jim

CDeutsch · 10-04-2006

Jim, what dead time are you using? I've tried everything from 120 to 450 and 150-180 seems to be the happy medium to get the Low and High LTFT close. My global is at -53% which is way off what I calculated it should be, but even at that it's still adding +12% for the fuel trim at cruise. Obviously somethings off on my setup and I think my AFPR is part of the problem because I can't the base pressure to stock levels at idle. The 02's cycle, but more like the car is having a heart attack then a nice even oscilation. It'll jump up to 18:1, down to 12:1 and randomly hit everything in between.

I just need to put some more time into diagnosing everything. I've maybe spent 8 hours total this whole year working on the Talon. The Evo's just a funner car to drive, period. But I did get somewhat excited to see the Talon put down 350 torque at 4000 RPM, maybe there's hope for the car afterall.

**Shane@DBPerformance** · 10-04-2006

Quote:

Originally Posted by santa

I have been running 100% e85 daily(about a month now). The last time I dyno'd it put down 465whp on 21psi(90 degrees in our shop).

SAE correction takes care of the 90 degree temps. With E85 the car won't be as affected by higher temps either. Cars that run 100% ethanol or methanol usually don't even run intercoolers.

Quote:

Originally Posted by santa

I can't get much more out of it as I'm maxing out the 2g mas.

Have you removed any of the honeycombs yet or hacked the MAS? I was able to make more power than that when I had a 2G MAS and SAFC. If the car is leaning out a lot, the Walbro 255 is possibly maxed. Do the math on when a 255 normally maxes on normal gasoline versus a fuel that requires 30%-35% more fuel flow.

Shane55113 · 10-04-2006

Quote:

Originally Posted by TalonFiero

What is your global fuel set at currently, I am going to guess around -29%? I wouldn't go any leaner than around -18%-19% on the global with 650cc and a 50/50 mix. Be sure and watch the duty cycle from there. Good luck!

Jim

i have my global at -41% and my dead time at 315, i cant change anything right now my laptop took a dump.