Wojo7

Is anyone running E85 with a Lindsey M Tune? I'd like to give it a try but I figured I'd get as much feedback as possible first. I've heard the E85 blends at the pump can vary in the amount of ethanol content, has anyone had trouble with this? Any info on your experiences would be great.
Thanks in advance!

bw993

Been running the M-tune with E85 for the last 6 years on a dedicated track 951 @ 21 PSI boost with no issues.

Adonay

Just make sure you get the bigger injectors and you will be fine.

Jon951

Has anyone used a flexfuel sensor to switch between or alter tunes?

Adonay

I don't think it's been done yet with maf upgrades and factory dme

Wojo7

It looks like at a minimum I'll need to upgrade my fuel pump, I've only got 80# injectors so I think I'll go with the Lindsey HV pump. I don't think it pays to install an E85 percentage gauge and flex fuel sensor since the MTune can't really make adjustments on the fly anyway. lindsey says you can reach 400 rwhp with E85 and 80# injectors.

bw993

For a fuel pump go with the Bosch -044, its a higher capacity pump than the HV.

odonnell

I have but not with the DME. I found it works as intended when configured right.

Wojo7

Does the wiring need to be replaced with the 044? On the Lindsey website it does not mention it for either pump.

Jon951

Odonnell how did you incorporate the flexfuel sensor? I have Mtune, vitesse and Elecrtomotive GT on various 951s well as stock and going through the doc they appear to each allow an E85 tune but don't switch or alter a map. Electromotive offers additional sensor input but I've not figured out how to change the maps.

bw993

I'm running the -044 with the stock wiring with my fuel pressure @ 3 bar. The -044 is rated for 200 liter/Hour @ 5 bar with max. current draw of 14 A, while the stock 951 fuel pump draws 11 A at 5 bar.

lee101315

I am running a M tune, E85, and a Super 75 Turbo on 80lb injectors. The only fuel supply mod I have is a fuel pump from a Mercedes W116 450SEL/6.9 with K Jetronic fuel injection... It flows 25%-30% more fuel. There arent too many options in Northern NJ so I go to Newark Airport for my E85, since its only a few miles away.

I was worried about running lean due to fuel supply, so I started at 15 psi and gradually worked up to 21 psi in 1 psi increments while closely watching my AFRs ( I also chose to install a new WB O2 sensor while I was swapping in the turbo for piece of mind ).

I have to give credit where its due...Whether I had a K27/8 at 16 psi or a Super 75 at 21 psi, my AFRs never crept over 12.0-12.5 on deep pulls in 4th gear. And with a Super 75, it pulls really hard. Most of Lindsey's Dynos show approximately 400whp, so its safe to say you'll be able to handle at least that much before going with larger injectors.

Does anyone else have the annoying issue of a 1500 rpm hot idle with the M tune on E85? When I'm on the 93 octane fuel map, it idles around 1050-1100...

Also, why would anyone want a flexfuel sensor? Just run the tank until its almost dry, and fill the tank with E85. Allow it to idle, and within a minute you should see your AFRs creep up from 14:1 to 18:1. When that happens, you hit the E85 toggle switch and the idle goes back to normal. I normally run 2-3 full tanks of E85 and then 1 tank of 93 octane, just to the tank and fuel lines healthy.

Jon951

^^Thank you, very useful information!

v8killer

Been running M-Tune/E85 22lbs. boost and Bosch 044 since 2011 on dedicated DE track/street car. Over 22k miles an probably over 50 track days with zero issues.

Paulyy

400 rwhp with e85 on 80lb injectors... I doubt that.

I mean... yeah i doubt it.

80lb injectors will get your 400hp at the crank with 100% duty cycle. And you don't run injectors at 100% duty cycle. (which mean always open)

For 400RWHP, you need at least 100lb injectors @ 90% duty cycle. which is still high.
You'll be playing it save at 110-120lb injectors for that power.