Fueling & Injection - tuning for E85
02-05-2006, 04:03 PM
Let me run this by you guys quick. If I use HPtuners to tell the pcm that I have 21.6 lb injectors when I really have 28.8 lb'ers, my stoich ratio should be pretty close if my current tune is close?
I got 21.6 by multiplying 28.8 by .75 to compensate for the different burn ratios of Gasoline and E85.
Is this .75 number close?
I dont think E85 will cause detriment to my fuel system, I've read about rust in the lines and water and I don't think it has any merit.
Pro Stock John
02-05-2006, 04:16 PM
There is a thread on www.turbomustangs.com about E85. I am very interested myself and may try an E85 tune at some point on my upcoming turbo project.
02-05-2006, 05:38 PM
could you give me a hint where to look on www.turbomustangs.com please John? The information regarding E85 is scetchy at best around here and very few people seem to have real world experience with it. I would love to see a sticky regarding this subject!
02-05-2006, 06:12 PM
well i hope you realize that E85 burns twice as fast and has way less BTUs so there is less power in it for ya.
02-05-2006, 06:32 PM
please back your statement up with proof.
ex. Someone lost power on a dyno because of it...?
With a reported octane # of over 100, one would reason that if the fuel system compensated for the larger volume of E85 needed for a stoich ratio then more power could made. I think this would be especially true in a FI application like PSJ's.
I would like to run it due to my compression ratio- 11.5:1. It is considerably cheaper than Premium fuel. I think this fuel deserves a serious looking at by the Hot rod community.
Pro Stock John
02-05-2006, 06:35 PM
It's a sticky in the top forum over there, guy made 1000rwhp on it.
02-05-2006, 06:48 PM
the thread PSJ is talking about...good stuff!
02-05-2006, 07:22 PM
Now thats a good E-85 thread. I love running it in my truck. I usually run a 50/50 blended mixture. I have raised the fuel pressure to 65psi, and the 10.7:1 383 L31 vortec loves the added boost in octane. It sucks when I don't fill with the right blend cause my SES comes on because the long terms go over 12%. Oh well, not to concerned.
02-05-2006, 08:14 PM
Besides being corrosive (edit: instead of saying corrosive I should say that it will attack epoxies and rubber in fuel systems) and hygroscopic ethanol also conducts electricity which is harder on your typical high volume electric fuel pump.
E85 is more like E80 as the ethanol itself is denatured with gasoline to keep weirdos from drinking it.
While being cheaper per gallon than premium due to subsdidies you're going to use more of it and it will cost a n/a only combination power due to its lower energy content.
Despite the above I'm all for it and hope more station open up. There is only one in the area I live in and its across the street from a government installation.
The possibilities for boosted performance applications are exciting and its widespread use could result in a profitable conversion industry.
But, it won't make the average consumer happy because it will cost more to drive the same distance and they will have to stop more often for fuel unless larger tanks are installed. I just don't see it taking off anytime soon.
02-05-2006, 08:22 PM
it will cost a n/a only combination power due to its lower energy content.
this is the part I dont agree with. I think the lower energy content can be worked around with larger injectors, and ultimately it's octane could allow for more aggressive timing curves and higher compression ratios (read- more power).
02-05-2006, 08:47 PM
We'll you're absolutely right if talking compression ratio from scratch. If its built for the fuel then you can optimize for it. If you're just switching over then expect a penalty over high octane gasoline.