E85 tune thread

[Tailgunner]

Hi JC,
An E85 tune alongside the 98 tune.
My man Dirk and other heavy hitters were posting of this.
My shop says Nah,nah,yeh,nah,nah,nah mate
Are they BSing me?
My L77 is set up.

 

[krusing]

Most L76's [I stand to be corrected if I am wrong] & L77's will already be E85 compatible,
Unless hey have been modified.
Even the VE V6's in Series 2 are also compatible, I was told by a work colleague,
well his SV6 is, as it got the compatibility sticker on the petrol flap.
I have L77 and I use E85 when they decided to up the price of petrol over $1.50 P/L,
It's a pig of a fuel, they say it packs a punch, causes the car to start and idle rough when its cold, [on first start up in the morning]
And idles faster, @ 2.6+ L/H.
Where 91 & 98 idles between 2.3 > 2.5 L/H.

 

[VS 5.0]

My Series II VE L77 is flex fuel (can run 91, 95, 98 or E85) from factory.

I would expect your is too @Tailgunner

 

[Tailgunner]

Yes it is flex fuel compatible.
I'm talking about the performance tune side of it.
I've heard there are separate 'E85 tables' in the computer to tune?
But my shop steered me straight away from that idea.
Is a twin tune a thing I think I mean?

 

[Tailgunner]

Don't try and say that when you're pißed either lol

 

[lmoengnr]

Yes it is flex fuel compatible.
I'm talking about the performance tune side of it.
I've heard there are separate 'E85 tables' in the computer to tune?
But my shop steered me straight away from that idea.
Is a twin tune a thing I think I mean?

The E38 ECU has 3 fuelling sections, low octane petrol, high octane petrol and ethanol blends.
The flex sensor works out how much ethanol is in the 'blend'.
Pretty sure United E85 is 85% ethanol year round.
Caltex Flex Fuel(not sure if still available?) blend varies from approx. 70% in winter, to 85% in summer.
More petrol in winter to make cold starting easier.

 

[VS_Pete]

My 2012 SV6 II Flex fuel is tuned for 95/98 (same tune) and E85.
Ask/show this to Dirk he should know about my tune.

 

[_R_J_K_]

Yes it is flex fuel compatible.
I'm talking about the performance tune side of it.
I've heard there are separate 'E85 tables' in the computer to tune?
But my shop steered me straight away from that idea.
Is a twin tune a thing I think I mean?

So are you wanting a flex tune or, like, two tunes that you flick back and forth from? If your shop can't do flex tunes go somewhere else, it's pretty standard these days.

For a flex tune it gets tuned on 98, then the tank is drained and it gets tuned on E85 (this part of the flex tune would be the E85 table you mentioned or something similar). The ECU then works out the "tune" on the fly based on the percentage of ethanol in the tank using the parameters from those two tunes.

"Twin tune" would mean that you would only run it on one fuel+tune or the other, nothing in between which would be totally pointless and stupid, particularly in this day and age where flex fuel solutions exist (a solution you already have too, like you don't have to do anything else, all the hard work is taken out of the equation). It would be like a dual fuel petrol/LPG car where you can flick between the gas tank and petrol tank, except that you can't because you don't have two fuel tanks and you'd have to totally drain the tank every time you wanted to use the other tune.

Plenty of big power cars on flex tunes. The E85 tune you get on flex won't be any different to the tune you would get if the car just ran straight E85 if that was the impression you were under.

 

[Tailgunner]

For a flex tune it gets tuned on 98, then the tank is drained and it gets tuned on E85 (this part of the flex tune would be the E85 table you mentioned or something similar). The ECU then works out the "tune" on the fly based on the percentage of ethanol in the tank using the parameters from those two tunes

This is the answer I was after.
Perfect, thanks RJK!
I'll hit up my shop again about doing this. I like the flexibility of having the ethanol capability. And the extra power.

 

[VS_Pete]

RJK is on the money.
First tune 95/98 fuel.
Then put 2 tanks of E85 in then tuned.