Running On E85 If Tuned On Flex?

[JordansR32]

I'm after some infomation, my car was tuned on caltex eflex, will I be able to use united e85 in my car if I ever wanted to, if I was around no eflex, and would it drive and perform as normal? I know caltex say the E% varies from 70-85 and they change it to suit the Seasons of the year, and united % is gaurnteed more, would the difference in e% change the way it performes?

[methz]

I think it will run leaner, other way around it would run richer, tuned on united85 but decided to run eflex.. i could be wrong though haha.

[r32-25t]

You'd be better of doing it the other way around, tune on e85 and run on e70 in an emergency, cause they way it will run rich

[Piggaz]

Don't run the tune within an inch of its life and it'll be fine either way.

[JordansR32]

There is no e85 close by, probaly about 30-40 minutes away, but there is eflex one 10 minutes from my house, thats more the reason behind it. Only asking coz there seems to be more and united coming up around the place

[r32-25t]

Or better yet do a full flex tune (can run from e0-e100 without issue)

[JordansR32]

I do have flex fuel sensor sniffer what ever you want to call it, the ecu has dual maps from 98 and eflex, so can't use either of them with what ever in the tank, just wasn't sure about e85 because it wasn't tuned on that

[boostn0199]

Depends on how it was tuned I ran e85 on my track car that was tuned on e70 and had no problems for over a year.

[JordansR32]

Depends on how it was tuned I ran e85 on my track car that was tuned on e70 and had no problems for over a year.

What do you mean on how it was tuned? With the fuel maps etc?

[boostn0199]

What do you mean on how it was tuned? With the fuel maps etc?

Whether the tuner has left left some leeway so that if you do put e85 from e70 and you run half a point leaner it doesnt matter but if it was tuned to its max and now you suddenly run it a point leaner it will affect you. Do you know what your A/F ratio was on the e70 tune?

[JordansR32]

Whether the tuner has left left some leeway so that if you do put e85 from e70 and you run half a point leaner it doesnt matter but if it was tuned to its max and now you suddenly run it a point leaner it will affect you. Do you know what your A/F ratio was on the e70 tune?

Oh yer true, umm don't know of the top of my head but I'm thinking that there is leeway there.

[Piggaz]

Why don't you ring the guy that tuned it and ask him?

[SiR_RB]

Mines tuned on caltex eflex, afew times I had to put united e85

Didn't notice any difference or knocking....tunes shouldn't be knife edge where 1 point difference in AFR's will granade your engine

[XKLABA]

It also depends on how Eflex is in the tank and how much E85 you put in, empty tank then fill to top will change the E% more then half tank adding 20l

I do have flex fuel sensor sniffer what ever you want to call it, the ecu has dual maps from 98 and eflex, so can't use either of them with what ever in the tank, just wasn't sure about e85 because it wasn't tuned on that

I don't get this, cause the only way this would be plausible is if you emptied the tank to change from one to the other, contact your tuner and ask if he has setup a flex tune

[discopotato03]

If tuned for E70 and had to use E85 it's simple to toss ULP in to make it E70 . Its a 15% difference you can work out based on an almost 60L tank . Works out to 2.25L of petrol to every 1/4 tank so 2.25 / 4.5 / 6.75 and 9 litres . I'm sure 3 5 7 and 9 would work fine and if you have a wideband wired it would compensate enough for normal road use .

Just don't bugger it up watching the dollars instead of the litres or carry a clean dry 10L container in the boot .

A .