e85 question

[luisphillips62]

ive been reading some past post of running e85 and that id need injectors fuel pump and fuels lines to not cause corrosion but would it be safe to mix maybe 2-4 gallons of e85 with 93 octane with my car once every like 8 months if even that?

 

[Brendon]

I wouldn't. Our cars are not set up to run E85. I heard through the grape vine that some tuners will be releasing E-85 tunes though. I am holding out to see if it indeed happens.

 

[luisphillips62]

I wouldn't. Our cars are not set up to run E85. I heard through the grape vine that some tuners will be releasing E-85 tunes though. I am holding out to see if it indeed happens.

do you know if running 100 octane with no tune is okay?

 

[TheCastle]

There have been a lot of threads on running E85 in the past. Look for E85 experiment.

Bottom line... You can mix 1-2 gallons of E85 with 93 octane and improve the timing pull/performance of you car on a 93 octane tune. All of the 100 octane tunes didn't work well with an E85/93 octane mix because the car's ran too lean and had extremely high EGTs. I've tried running E85 myself. You'll get a few more degrees of timing advance with a mix. But its hard to calculate partial tank fills to keep the mix right.

The problem is that you require a richer tune to run E85 and none of the current tunes offer that.

Your car won't run very lean with 1.5-1.7 gallons of E85 mixed in and the long term fuel trims will be in the safe range, no more than +10%. More than that and you car will run out of spec.

APR, and unitronic have played with E85 tunes but nothing has come to market. Mainly because E85 ethanol content is so variable across the country and throughout the year.

 

[NJA3201]

There have been a lot of threads on running E85 in the past. Look for E85 experiment.

Bottom line... You can mix 1-2 gallons of E85 with 93 octane and improve the timing pull/performance of you car on a 93 octane tune. All of the 100 octane tunes didn't work well with an E85/93 octane mix because the car's ran too lean and had extremely high EGTs. I've tried running E85 myself. You'll get a few more degrees of timing advance with a mix. But its hard to calculate partial tank fills to keep the mix right.

The problem is that you require a richer tune to run E85 and none of the current tunes offer that.

Your car won't run very lean with 1.5-1.7 gallons of E85 mixed in and the long term fuel trims will be in the safe range, no more than +10%. More than that and you car will run out of spec.

APR, and unitronic have played with E85 tunes but nothing has come to market. Mainly because E85 ethanol content is so variable across the country and throughout the year.

:clap:

 

[trd420]

From what I heard the reason we don't have it is our fuel system is not up for it. Something to do with the injectors

 

[TRUboost]

do you know if running 100 octane with no tune is okay?

Running anything over 93 without a tune is pointless.

You want to run the lowest octane possible without knocking, since lower octane fuel burns hotter and makes more power.

The only reason a turbo car or high compression car makes more power on 93 vs 91 is the ECU can push more timing without knocking.

 

[Brinkmen]

do you know if running 100 octane with no tune is okay?

It shouldn't hurt your car but you will be able to tell if you run pure 100 oct. I would highly not suggest running less than 89 oct. Our cars will still run on it because the computer will auto adjust what it needs to so we don't get knocks. Don't expect your car to respond very well and you will probably get like 16-17 MPG around town. My dealer filled my tank from almost empty to 3/4s of a tank when I bought my car. Even though I topped it off with 91(highest easily available here in CA), I still got crap MPG for that tank. I made a point to be nice to the car for that tank also.

 

[littleazn248]

do you know if running 100 octane with no tune is okay?

It'll be fine but the difference of running 100 octane on a stock car will be pretty much un-noticeable.

 

[chrisisnapping]

There have been a lot of threads on running E85 in the past. Look for E85 experiment.

Bottom line... You can mix 1-2 gallons of E85 with 93 octane and improve the timing pull/performance of you car on a 93 octane tune. All of the 100 octane tunes didn't work well with an E85/93 octane mix because the car's ran too lean and had extremely high EGTs. I've tried running E85 myself. You'll get a few more degrees of timing advance with a mix. But its hard to calculate partial tank fills to keep the mix right.

The problem is that you require a richer tune to run E85 and none of the current tunes offer that.

Your car won't run very lean with 1.5-1.7 gallons of E85 mixed in and the long term fuel trims will be in the safe range, no more than +10%. More than that and you car will run out of spec.

APR, and unitronic have played with E85 tunes but nothing has come to market. Mainly because E85 ethanol content is so variable across the country and throughout the year.

hmm..wonder how the car would run with ~2gallons of e85, 93oct and meth injection on a 100oct tune.

 

[TheCastle]

hmm..wonder how the car would run with ~2gallons of e85, 93oct and meth injection on a 100oct tune.

leaner.

If you already have 93 octane fuel, and are running w/m injection you can run a 100 octane tune. Adding 2 gallons of E85 (assuming it is e85 and not a lesser amount of ethanol) gives you 94.7 octane and 20.3% ethanol in your tank (assuming you 93 octane is 10% ethanol already).

From past testing, this will cause your car to run lean and your car will compensate by increasing the Long Term Fuel Trims to compensate. Most folks find that running anything greater than about ~20% causes the car to run too lean and go into protection mode cutting power.

So you've not really gained anything when running w/m. Running without w/m a mix of E85/93 say 1.5 gallons of E85 will increase your timing advance (with a tune) and increase your long term fuel trims (to run richer so fuel economy will drop). But you will make a little more power.

 

[zrickety]

E85 will not save you any money, you lose gas mileage. It has no performance benefit unless the car is tuned for it, then you need to run it all the time. 100 octane is fine stock, but you are throwing money away.

 

[mg_90]

I have been using E85 mixed with 98 octane gas with the APR 104 octane tune with the Stage 1 and now with the Stage 2 for over two years without any problem.

Once you find the correct % and ensure with some LOGs that the injection timing, timing retardation and lambdas are OK there is nothing but power.

:thumbsup:

 

[omgheyitskenny]

For those who are using e85 mix. Have any of you taken apart your HPFP and see if there is sticky oil based crap (black death) in there in the spill valve mostly. This was the problem on E85 mix I had on the mazdaspeed3 my HPFP would get clogged and had to clean every oil change