One Gallon of E85 for ACN91 - BM3 Suggested...

[jpy1980]

Originally Posted by chewbakam4

I’ve beat on my S55 with the stage 2 ots 93 and 91 octane maps without ever topping it up with anything. Of course some places will have absolute shit octane and you need to run a lower octane map. That’s why you have logging too in case of concerns and to verify.

What do you look for when you log?

[jpy1980]

Originally Posted by terahertz

The STFT will adjust up to a limit. I used to run 2.5 gallons no problem. That was the size of my fuel container so I could bring an extra fill-up with me. Piggyback/jb4 guys ran up to e40ish before STFT maxed out, so the range is pretty large.

If you're going to add more than that, might as well switch to the E30 map and mix E30. I'd probably mix E35-E40 since our normal fuel is so bad.

Great info. Would you normally log to see if it was helping?

[bioman]

I used to put about 3 gallons in per fill up. Was a little hectic every time to go to 2 gas stations, so I just bought some boostane. A little more expensive, but more convenient for me.

[terahertz]

Originally Posted by jpy1980

Great info. Would you normally log to see if it was helping?

Yes. But too much octane isn't a problem.

[E92inSG]

Originally Posted by jpy1980

Great info. Would you normally log to see if it was helping?

Drops in ignition timing advance and knocking under WOT

[nbennettksu]

Originally Posted by horsepower_and_hounds

That basically gave you 1 oct point if the E85 & 91 is qood quality...

92 Octane
% Ethanol is 14.75
same as E15
Total Gals is 15.80

personally would do at least 2

Why not just upgrade to OTS E30 and really wake it up?

[jpy1980]

Originally Posted by nbennettksu

Why not just upgrade to OTS E30 and really wake it up?

Well my whole point of doing it wasn’t for power but making the shitty gas in LA a bit better

[horsepower_and_hounds]

Originally Posted by jpy1980

Well my whole point of doing it wasn’t for power but making the shitty gas in LA a bit better

Add 2 gal to your fuel and call it a day

[BzsBimmer]

So if adding two gallons to ACN91 tune, would it allow me to run normal 91/93 octane tune?

Much of a difference?

[TopJimmy]

Originally Posted by BzsBimmer

So if adding two gallons to ACN91 tune, would it allow me to run normal 91/93 octane tune?

Much of a difference?

If your base fuel is ACN91 you should stick with the ACN tune, even if you juiced it up with some E.

[E92TiAg335i]

I'm in Florida where we have traditional 93. I'm downpipes and stage 1 BM3?

Can i try running 1-2 gallons on my setup?

I used to LOVE blending some e85 with my jb4 335.

[BzsBimmer]

Originally Posted by TopJimmy

If your base fuel is ACN91 you should stick with the ACN tune, even if you juiced it up with some E.

Thanks. Appreciate the info!

[fiveohwblow]

I ran the standard stage 2 93 with Arizona 91 and around 3 gallons of E85. Bottom line the acn fuel is just a lower octane. Enough E85, you’ve enough octane to have greater than 93. While it provided good power, the only drawback I had was the fuel economy tanked.

[MisterF80M3]

I'm getting 16MPG on E30 tune. Typically I get 22MPG.

[trungnguyen28]

Originally Posted by BzsBimmer

So if adding two gallons to ACN91 tune, would it allow me to run normal 91/93 octane tune?

Much of a difference?

I tried this tonight actually. Stage 2, 91 octane (NON-ACN). All 3rd gear WOT pulls starting at low rpm and to redline and shift to 4th for a little. 5 pulls, back to back. I didn't get any knock, I'm not sure if I would knock in 4th gear if I stayed longer.. Will take another night to mess around with it.

Tried the Stage 2, 93 octane map- I would get a knock immediately after shifting to 4th. 3 pulls back to back.

I really want to try 3 gallons of E85 and attempt the 93 octane map. Does anyone know how that'll work out?

[TopJimmy]

PTF says if you have ACN91 then use the ACN map even if you juiced it up, but not a 93 map.

If you're fuel is 93 you can add 1-2gal of E. If you go too far you will hear sputter/miss at high RPM (should be logging to see things first).

[jballer123]

I have also logged this, the acn 91 and stage 1 91 have very little difference in max timing and boost level, with 2.5 gallons of e on shit 91 ca gas , I had no knock and almost hit full timing , only sometimes would 1 or two cylinders be down a degree or two on timing

[horsepower_and_hounds]

Originally Posted by trungnguyen28

I tried this tonight actually. Stage 2, 91 octane (NON-ACN). All 3rd gear WOT pulls starting at low rpm and to redline and shift to 4th for a little. 5 pulls, back to back. I didn't get any knock, I'm not sure if I would knock in 4th gear if I stayed longer.. Will take another night to mess around with it.

Tried the Stage 2, 93 octane map- I would get a knock immediately after shifting to 4th. 3 pulls back to back.

I really want to try 3 gallons of E85 and attempt the 93 octane map. Does anyone know how that'll work out?

I am pretty sure you can run 3 gal without fuel trim issues. Over that you should run the E30 map. Some cars have issues with 4 gal and some like my old M4 I could run 5 gal.... anymore and it would trim out. Have not tried it on this one....I don't even have pump E85 here right now due to COVID

3 Gal good E85 with good 91:

mix is 94 Octane
% Ethanol is 24.33 or same as E24
Total Gals is 15.70

[trungnguyen28]

Originally Posted by horsepower_and_hounds

I am pretty sure you can run 3 gal without fuel trim issues. Over that you should run the E30 map. Some cars have issues with 4 gal and some like my old M4 I could run 5 gal.... anymore and it would trim out. Have not tried it on this one....I don't even have pump E85 here right now due to COVID

3 Gal good E85 with good 91:

mix is 94 Octane
% Ethanol is 24.33 or same as E24
Total Gals is 15.70

So I went to get dyno'd today testing the Stage 2 91 octane vs the 93 octane map as well as datalogging. Mods are just charge pipe and downpipe. 3 Pulls of 93 octane and 1 pull on the 91 octane map.
I did 3.5 gallons of E85 and the rest was Chevron 91. All from the same station too. I did 3.5 gallons of E85 assuming its rated at only 100 octane to make up for shitty 91.
Car has 44k miles and stock plugs as well.

Car made 510/530 on a Dynapack 5th gear WOT pulls - logs show no knocks! Both maps made the same power pretty much, not sure what's the difference.

Logs for those interested:
https://www.bootmod3.net/log?id=5fae...729b116c36c86b
https://www.bootmod3.net/log?id=5fae...90c64de0b080c7
https://www.bootmod3.net/log?id=5fae...0b4307450408d6

[trungnguyen28]

The middle sheet is a comparison with a stock M4 that was here that put down 433/436. Strictly comparison purposes.

[BzsBimmer]

Wow. That’s some dedication to do dyno’s just to show me the difference of 91ACN vs 91+E. Thanks 🤩

[jpy1980]

Originally Posted by trungnguyen28

So I went to get dyno'd today testing the Stage 2 91 octane vs the 93 octane map as well as datalogging. Mods are just charge pipe and downpipe. 3 Pulls of 93 octane and 1 pull on the 91 octane map.
I did 3.5 gallons of E85 and the rest was Chevron 91. All from the same station too. I did 3.5 gallons of E85 assuming its rated at only 100 octane to make up for shitty 91.
Car has 44k miles and stock plugs as well.

Car made 510/530 on a Dynapack 5th gear WOT pulls - logs show no knocks! Both maps made the same power pretty much, not sure what's the difference.

Logs for those interested:
https://www.bootmod3.net/log?id=5fae...729b116c36c86b
https://www.bootmod3.net/log?id=5fae...90c64de0b080c7
https://www.bootmod3.net/log?id=5fae...0b4307450408d6

Where are you getting 93 octane in CA?!