About to tune for e85

[doodguy]

Im about to start tuning for e85....

Can someone explain this in stupid terms? Even feel free to point me to an faq or something?

Im on 93 now. When i start tuning for e85, what do i do? Run tank low then fill with 93, put e85 base tune in, run tank low again then fill with e85 again then start the wot logs?

E85 is avail around me, but not everywhere. So say I'm on my high boost pulley, running or of gas. So i fill with 93, stay off the throttle til i get home and change pulley? Do you go through 2 tanks of gas before youre comfortable flooring it with e85 if 93 is below say a quarter tank the e85 fill dilutes it enough is not an issue?

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[venumous]

Wait, what? Why would you fill with 93 once running low on 93 and run the E85 tune? That makes no sense.

 

[doodguy]

Wait, what? Why would you fill with 93 once running low on 93 and run the E85 tune? That makes no sense.

No. Im saying if im on e85 tune, with small pulley, and need gas can only get 93, is there anything wrong with loading 93 tune, babying car home, then change pulley?

I may mainly run 93 and only run e85 when i go to track.

 

[doodguy]

Im also curious how particular things are on high boost with e85... is it imperative that 100 percent fuel us e85 or is being quarter tank of 93 filled with e85 fine.

 

[16s550]

If it's a Lund tune your afr should adjust automatic, and as long as your afr has adjusted to the new gas u should be good to drive however . Try to run as low as possible before swapping. And you mean flex fuel right? Not just straight e85?

 

[doodguy]

They dont offer flex fuel tunes for forced induction yet.

I have never ran e85 before. Just not sure what to expect/watch for

 

[Major League Infidel]

I run E85 almost exclusively in the car. However when I was at Mustang Week the one station that was there ran out of E85 so i drove the car as low as I felt comfortable doing and swapped to my 91/93 tune and kept on trucking. However being that I was on the small pulley I just stayed out of the throttle and drove nice on the 93 to be safe. It would not be good to be on high boost and romp it on 93.

 

[Plimmer]

Based on stuff I've read, and a little experience with a turbo 4 cylinder you typically get all or most of the benefits of e85 with mixes of 50% or higher.

So if you had an nGauge and you run out of e85, you could put in enough 93 to get you to the next e85 pump. You would flash in your 93 tune which hopefully pulls a little timing compared to your e85 tune. Our cars have wideband sensors, so the fueling is always adjusted back to the lambda commanded by the ECM, no matter what fuel you have. Then you could just baby the car to the e85 pump and top off again.

 

[venumous]

No. Im saying if im on e85 tune, with small pulley, and need gas can only get 93, is there anything wrong with loading 93 tune, babying car home, then change pulley?

I may mainly run 93 and only run e85 when i go to track.

Makes more sense, definitely not what I got out of the original post, lol.

That should be fine as long as you don't push the car into boost I would think.

 

[Pincushin3819]

I wonder when they will have the flex fuel available for FI? It's really awesome to have that choice at the pump especially if e85 is not available & having your tune adjust it's self on the fly. I'm curious, I've never had flex fuel on super charged car only my turbo car. I can run E85 up to 20+ lbs of boost or 15 lbs on 50/50 & 10 lbs 91-93 oct. I just hit a button on my boost controller & the tune pulls the timing.
Does anyone know how this would work on a blower car? Would you have to switch pulleys or is it possible to use the same pulley & pull enough timing?

 

[MyLilPony]

I wonder when they will have the flex fuel available for FI? It's really awesome to have that choice at the pump especially if e85 is not available & having your tune adjust it's self on the fly. I'm curious, I've never had flex fuel on super charged car only my turbo car. I can run E85 up to 20+ lbs of boost or 15 lbs on 50/50 & 10 lbs 91-93 oct. I just hit a button on my boost controller & the tune pulls the timing.
Does anyone know how this would work on a blower car? Would you have to switch pulleys or is it possible to use the same pulley & pull enough timing?

There is a post about 3 down talking to this topic. Protecting a brand name is the key issue here. They can do it but idiots could tarnish a good name...

You can pulley down and waste gate a SC car to essentially do the same thing as a turbo car with boost control. As for a tune adjusting based on boost that would would be cool to have but haven't seen it in this world yet. My evo I would run 35lbs at the track and 20 on the streets and all I did was adjust my boost controller. But that was also a factory turbo car with boost maps built in and my tuner was very good at what he did. Maybe ecu limits on the mustang? Not sure as I am purposefully staying away from doing my own tuning with this car.

 

[Pincushin3819]

As for a tune adjusting based on boost that would would be cool to have but haven't seen it in this world yet. My evo I would run 35lbs at the track and 20 on the streets and all I did was adjust my boost controller.

Yeah that's pretty much what I do with my Camaro but depending on my fuel content & mixture.

So thats awesome to have centrifugal blower with a wastegate & boost controller. I see how this would work now, you would have a small pulley but the wastegate spring would keep the boost in check, then you could adjust the spring rate with the boost controller depending on tune & fuel. So are PD guys SOL other than a pulley swap?
The reason I'm asking is because I'm stuck between a Paxton build or a Whipple but this would definitely sway me Centrifugal.

 

[beefcake]

i would get a 5 gallon tank of e85, get yours as low as possible, disconnect a line on the fuel system, and trigger the pump to get out the last few gallons of pump

with a large fuel system, i wouldn't be trying to run it super low for long periods, jumping the fuel pumps will get all of the fuel out in a minute or two, and they won't have to run low for long periods,

swap tunes, then fill the e85, then drive and top off

i think lund could actually do you a drain tank tune, that you won't even have to jump the pumps

 

[zaquhree]

I have used tank drain tunes with big success from Lund

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