Wondering if it would be possible to get 160 lb primary injectors to idle running E85. Assuming 30% additional fuel is needed. I'm upgrading my rails and injectors for E85 and the 160lb injectors are cheaper than the 95/100lb injectors and would give me more overall horsepower potential. Any thoughts?

 

I'm using (2) 1680 CC injectors for my primaries. It hasn't ran yet but, that's what I've got so it better work.

 

Idles perfectly and as lean as you want it to be with the right ecu or tuner.

 

I wasn't sure whether the duty cycle/opening on the injectors could be set low enough and be controlled enough to actually idle and idle at a decent A/F ratio 12.5-13. I am running a PFC currently I am having doubts it will handle the injectors though. I could not find it in a search but believe the PFC has a minimum ms of opening. Oh and I'm the tuner so that side shouldn't be a problem

 

I am running 1680cc primaries on regular pump fuel (not E85).

Ecu is Autronic SM4 and the injectors are run in sequential mode.

 

Interesting thread. I did some quick calculations. Take the 30% more usage on E85, i would use up about 4778 cc of injector to get the same power level as current. That would put me way over the 80% threshold. If i switched up to 1600 cc injectors all around, that would put me at 75 % duty on E85. That still doesn't leave much room to play. If i were to run E85 I'd like to at least raise the boost to 25 psi.

 

There's always the 2200 cc injectors at 150 each.

 

I'd need to add a reserve 20 gal fuel cell for that crazyness. I'd have to have all the E85 stations around indiana mapped out.

 

From the looks of it, you're going to make more power with E85 on the same boost as you would on pump gas.

So, you need to figure out how much power you want instead of how much boost you want.

You can always add a few $50 bungs and buy some cheap 1680 injectors.

Anyhow, who knows. You might only need to add 20%. Looking at the E85 forum, people are running 20-30% more fuel. So, I don't think that 30% is set in stone.

Crispeed will have results this week so hopefully he can confirm or deny these rumors

 

Typical gasoline Thermal energy 19,000 BTU/lb max power fuel air mixture 12.5:1
Typical E85 Thermal energy 13,475 BTU/lb max power fuel air mixture 6.975:1
Typical ethanol Thermal energy 12,500 BTU/lb 6.429:1

If you are consuming 100 lbs of air, lets see how much fuel energy you release for each of these fuels.
100/12.5 = 8 lbs of gasoline @ 19,000 BTU/lb = 152,000 BTU
100/6.975 = 14.337 lbs of E85 @ 13,475 BTU/lb = 193,189.9 BTU = 127% more heat energy
100/6.429 = 15.555 lbs of Ethanol @ 12,500 BTU/lb = 194431.5 BTU = 128.9% more heat energy

 

Zinx you have to remember Portland Indiana (just north of Muncie) has the largest ethanol producing capabilities in the world. Not to mention the Bluffton Indiana plant (30 miles north of Portland) is going to be operational soon too. You being in Indy should be able to profit from this. Last I checked E85 was 2.39 a gallon where I live.

 

This is St.Louis, taken on the 13th

 

****...the few e85 places i've seen in MS/AL it .10 cents cheaper than 93 octane.

 

I'm surrounded by corn fields

 

i live right beside one of the Canadian refineries making e85....we don't even sell it here

and pump gas is no cheaper regardless of the distance which sucks.

 

I have 850 primares, 1600cc secondaries, and dual walbro 255 pumps. 424whp at 18psi. idles just fine.

 

Sorry but I'm talking 1600 primaries not 850's. Could you give me the duty cycle, rpm and vacuum at idle, assuming this is E85.