So my car has got a n/t shortblock with a head thats been cut like .050", works out to have like 9.5:1 compression...kinda knock happy sometimes. so E85 was in order. Our cars run extremely rich at wot from the factory, this puts us in the ball - park of what E85 wants. all thats needed to get the rest is elevated BFP. This works well on a 1G because the BFP is very low.(36psi). So by bringing it up to about 55psi we trick the ecu into adding enough additional fuel run E85. Because of the high pressures a 255hp should be used.

Back onto my car, I modded a n/t fpr to be adjustable. With straight E85 and the new regulator, the car runs amazing now, on the logs I get no knock, about .83v on the nb, and 22* timing.

Running 9psi the car would trap 90mph, just changing to E85 the car now traps 101mph..Not a bad improvment for a butchered fpr and cheaper gas...

Stock 450's? I would assume you'd be getting close to maxing those out at stock boost.


Thats pretty interesting though. With all the "speculation" surrounding E85, it's good to hear of a simplified converson.

You gained 11 mph just by switching from 91 octane to E85....Nothing more....? Sounds fishy...

-Kevin-

nice! could you post pics of your hack mod on the fpr? i might want to try!

Whats your injector duty? How are you monitoring your fuel pressure? What are your a/f ratios

Im guessing he has nothing for mods besides a 255.

Hes using the fact that our cars run Rich from the factory and jimmy rigged an FPR to raise the FP.

Doing this made running E85 doable without calc it in.

These are my guesses.


I see on jeffgst.com that if you run 550cc injectors with E85 your global is at 0.

So you should bealbe to add 550cc injectors with no calb and fill her up with E85 and be great.

So what about a 2g with 450's a afpr and a 255, 6 bolt swap using a 95 ecu and safc, Could this work also?

I want a pic of this modded fpr.

xxShaneOmac said:

Im guessing he has nothing for mods besides a 255.

Hes using the fact that our cars run Rich from the factory and jimmy rigged an FPR to raise the FP.

Doing this made running E85 doable without calc it in.

These are my guesses.


I see on jeffgst.com that if you run 550cc injectors with E85 your global is at 0.

So you should bealbe to add 550cc injectors with no calb and fill her up with E85 and be great.

Click to expand...

Exactly! My bfp is bumped up enough so that my 450's flow like 550's.. The kicker is my car has a n/t shortblock with a milled head so my compression is 9.5:1. low compression cars will not see gains like I did. i did this becuase I would get some knock with a 1g's crazzy agressive timing. I do get 100% idc, but I think it might a slight boost leak..and my 16g and fmic flowing pretty good. Havn't even put the wide band in it yet.. I'd guess i have high 12:1 afr.

This is pretty much a 1g mt only deal.. you might be able to get away with swapping 450's in for 390's on a auto car and have it work.

danyz250f said:

I want a pic of this modded fpr.

Click to expand...

buy the B&M kit for our cars and use it....the modded fpr is to jury rigged. It works but its ghetto as hell.


Its getting 22mpg as well.

Sucess dosn't mean its tried and true.

I will say stay away from this as lighting never strikes twice in the same place.

If I were to be as cheap as possible I would install a 255hp rewired and I would not do this without a AFPR. (I do not know if a 190 will work so ifso use one of them)

Then throw in 550cc injectors and run straight E85.

With JeffGST.com's numbers your global will equal 0 with 550cc injectors on E85 witch means 450 setup's.

I think that would work well. But dont Quote me :]

xxShaneOmac said:

Sucess dosn't mean its tried and true.

I will say stay away from this as lighting never strikes twice in the same place.

If I were to be as cheap as possible I would install a 255hp rewired and I would not do this without a AFPR. (I do not know if a 190 will work so ifso use one of them)

Then throw in 550cc injectors and run straight E85.

With JeffGST.com's numbers your global will equal 0 with 550cc injectors on E85 witch means 450 setup's.

I think that would work well. But dont Quote me :]

Click to expand...

I expect that would work very well...I don't think you would see much for gains on a 2g with factory pistons, and no way to add extra timing.

I am pretty much doing it the same way you are talking about. I do plan to get a afpr...the 255 overruns the stocker.. a 190 would be marginally too small...at the high pressures the flow falls off fast. I honestly don't reccomend this to anyone unless they have high compression 9+:1

E85 allows more boost.

Crank up the PSI and you shouldn't see knock

So this is what the benifit would be

xxShaneOmac said:

E85 allows more boost.

Crank up the PSI and you shouldn't see knock

So this is what the benifit would be

Click to expand...

Nope...your going to get fuel cut at the same point as with gasoline. On a stock compression engine you could make lots more power on 550's with gas, than 550s on E85.

Again what is your injector duty at

bastarddsm said:

Nope...your going to get fuel cut at the same point as with gasoline. On a stock compression engine you could make lots more power on 550's with gas, than 550s on E85.

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I stand corrected :]
Your right with no way's of touching timing and being cheap and only using injectors that fuel cut is known for..

Your right :]

Ok so If you cant touch timing E85 dosn't help with thoes injector range

Nice to see more people experimenting with e85. Did you shave the head to increase compression or just to make it flat again? If it was to increase compression you might want to find a 4g67 head which has a 43cc combustion chamber compared to the 63's 47cc combustion chamber. That should keep the 9.5:1(i think), but keep your timing belt geometry correct. Or, if you wanted more compression you could probably mill that head the same amout and probably be close to 10:1 if your figure is correct. Im not sure.

I had my head cut because it was warped really bad. I see 100% idc's, but I think I have a boost leak..

shaneomac....I did this becuase I have high compression..Thats why I saw large gains. This is probably worthwhile for most guys that did a n/t to turbo conversion. Also if E85 is cheap enough in your area, it is a financial gain as well.. I get 22mpg, (down from 25-26mpg on 93oct), and I am still running 14.7:1 at cruize. I expect to see about 24-25 once I lean out cruize a/f ratios. Currently the juice is 25%+ cheaper than 93 around me.


On a 2g you should be able to get away with swapping in so 550's and calling it a day. you could also add a 5th 450cc injector in the Im or I/C piping, and have it triggered off one of the other 4 injectors. that would be really easy to swap between 93 and E85. Just turn the 5 injector on or off.

I am shooting for this car to run in the 12's on stock 450's and fuel availble from the pump.

My next goal is for the factory dsm ecu to have full flex fuel support. and then I'll get some evo 560's so I don't have a ghetto rigged setup. I do feel that bumping the BFP up for E85 is a better soulution than using large injectors. That way when you switch back to 93 you don't have ridiculously large injectors. However there realy isn't a clean way to accomplish that with full ffv support.

Where's the financial gain?? I don't see it. If it only costs 25% less and you use 27-30% more.

Gasoline: 114,000 BTU/gal
E85: 87,250 BTU/gal

That's 27% less energy it can do per gallon of gasoline.

You're actually losing money... Plus doing it right requires expensive parts to get it to work correctly. I hate it when people say it's cheaper and you can get the same mileage. Don't get me wrong I like the fuel and have a few buddies running it. But on a little bit larger setup where you're looking for 400-450hp you need more of a tuning device to utilize it better. My friend's '92 on an 18g has 950's and a maft gen 2. He switched to the fuel due to him getting knock on his 750's from too much timing. His car idles like shit due to incorrect dead times and stalls on occasion because of that. But WOT is great!!! It put down 390hp and 395ftlbs @ 20psi. No knock and a 12.5:1 AFR and a few boost leaks. The ONLY benefits to running E85 is a fuel that does not knock and is better for the environment.

Here is a good read if you are truly interested: http://www.eere.energy.gov/afdc/e85toolkit/pdfs/e85_driver_training.pdf

I know you're trying to be cheap but for the love of god, did you at least replace your paper fuel filter?? If you didn't you're going to be sorry when your injectors get clogged while doing a WOT pull from that paper disintegrating.

well.....i get 22mpg down from 26 22/26 = .84 I get 84% of the mpg I got on 93oct.. However. I buy E85 for $2.99/gal, and 93 for $4.09/gal 2.99/4.09 = .73 So I pay 73% of what I would on 93. Its roughtly 11% cheaper. Looking at it this way...4.09/26 = $.15/mile for 93 2.99/22 = $.13/mile

It is cheaper. I'm not running it becuase its cheaper, I run it becuase I can't run 93.

I know I've done the calculations myself. Just please don't inform people that there is a financial gain to be had by running this fuel. It is a wash as far as the numbers point.

bastarddsm said:

Also if E85 is cheap enough in your area, it is a financial gain as well..

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And saving a penny per mile is not going to save you much. And that's in optimal conditions. If your fuel pump cost you $99.00 it would take you 9900 miles to pay for itself. That's a year's worth of driving to some folks.

BTW, you didn't answer my question about the fuel filter. That's another $65-$100 Mandatory investment.

Our prices here are at:

E85 - 3.09/gal (E85prices.com and we have the cheapest prices in the area!!)
Premium Gasonline - 3.79/gal (I know since I just filled up!! Missouri has the cheapest gasoline in the US..) <---- Maybe that's why I still run gasoline??

Now do the calculations. That's .14 for E85 per mile @22mpg and .14 for Gasoline @26mpg

This is all true...but another way to look at it..you get a race gas tune for pump gas cost..Thats my reason.

That's a fact!!

bastarddsm said:

This is all true...but another way to look at it..you get a race gas tune for pump gas cost..Thats my reason.

Click to expand...

x2

You were probably going to upgrade your pump and filter for a gas setup anyways since they are the 2 biggest downfalls of the stock delivery system, so that argument doesnt hold up very well either.