Paulyy

I want to know how much boost I'm limited to running e85 on my stock fuel pump on M-Tune or if it cannot be answered like that, how much power?

I could increase the boost by 1psi and watch the afrs if they increase past 11-12:1 or is that a bit dangerous ?

Adonay

My pump could not even do 15psi with out getting lean spikes while E85 was in use . If you want to boost it do the right thing and install a 044 and crank it up to 20psi.

Power should be about 11% more with E85 at the same boost level.

Great thread about 044 pump install

Paulyy

Thanks for the thread, if i could do 18 psi id run it, I'm already planning on putting in an 044 pump soon, but theres a few other things to take care of also.

NZ951

The issue will be equally with your injectors... in some applications you need 30-40% more fuel on 85% Ethanol.

Paulyy

I've got that covered, M-tune dual map e85/pump and 80lb injectors

Adonay

Edit guess you were faster answering .

Anyways i speak from experience i tried e85 before i had the right pump and was very disappointed. I could boost for two seconds before it leaned out with the stock pump an 15psi. Even my 044 struggles at anything above 23-24 psi .

Paulyy

Adonay, What clutch are you running, Pressure Plate ect..?
Cheers,

Adonay

I run a cup clutch stock pressure plate have very little slip in fifth gear woot . Or other words have not noticed any slipping .

NZ951

Love your choice of turbo Paul by the way, its about time people started using those (and the 35) on those motors!

Even with injectors that size you might be maxing out around 400HP...

NZ951

I had the cup clutch and KEP pressure plate and my slipped in 3rd on the strip once, making around 400BHP.

Paulyy

Thanks mate! 1 reason why I'm going for e85, the turbo will sing around 23 psi!

NZ951

You could run that boost easily with 98 though? I ran 28psi on 98 without issue? Or do you want to run a lot of ignition advance?

Paulyy

Well josh (rogue tuning) recommended 18 psi at the most, since i'm running his software and it's boost limited so i cannot run more then 18 psi. I think the problem was detonation the more you increase in boost and retard in timing,

you ran 28 psi on a stock 951 block? or something else?
There's a few people saying our fuel is **** but 98ron is 98ron no matter what brand it is right? if it's not 98 then it's false advertising.

NZ951

Why did he recommend 18psi? Its likely because he has not mapped higher psi values in the software?

Yes 28psi on the stock bottom end. 98 is 98, unless its old fuel... then the octane deteriorates. 98 will be the average rating, sometimes a little more sometimes less. In my track car I run aviation fuel, which is 100 and is tested as they cant sell it if its less for obvious reasons.

Paulyy

IICR it goes as high as the 3 BAR MAP sensor goes which is again IICR ~29 psi

The other reason for e85 is the ability to run a lot of boost with the high octane the fuel has.

I'll PM Josh if he could chime in on what he reckons on more boost with his tune.