Octane booster

[StockM4]

So im tuning my car on upgraded twins, and currently doing a 91 fuel tune but my tuner is having a hard time saying my 91 quality is very bad and not holding timing good.
We have done like 15 revisions so far, my question is… has anyone ever ran boostane octane booster to up their 91 fuel quality? Since here in norcal our 91 fuel sucks ass.
Was looking at trying this just to up my fuel quality a lil bit.

https://boostane.com/boostane-shot/
Any info is appreciated.

[hellokitty]

Originally Posted by StockM4

So im tuning my car on upgraded twins, and currently doing a 91 fuel tune but my tuner is having a hard time saying my 91 quality is very bad and not holding timing good.
We have done like 15 revisions so far, my question is… has anyone ever ran boostane octane booster to up their 91 fuel quality? Since here in norcal our 91 fuel sucks ass.
Was looking at trying this just to up my fuel quality a lil bit.

https://boostane.com/boostane-shot/
Any info is appreciated.

Can you run an ethanol blend instead?

[TopJimmy]

Boostane will coat your O2 sensors and exhaust system with orange dust. After just 3 cans the dust was thick. Stay away.

Better to use Ethanol to supplement octane. If you can't get E then de-tune for your ACN 91.

[StockM4]

Originally Posted by TopJimmy

Boostane will coat your O2 sensors and exhaust system with orange dust. After just 3 cans the dust was thick. Stay away.

Better to use Ethanol to supplement octane. If you can't get E then de-tune for your ACN 91.

Do u think adding a gallon of e85 will help? I was considering doing that

[TopJimmy]

Originally Posted by StockM4

Do u think adding a gallon of e85 will help? I was considering doing that

I'd use 3gal of E85 per fill up of ACN91. If you get any sputter on WOT then back it down to 2gal of E85 next time.

See the link.

https://www.bimmerpost.com/forums/sh...php?p=27644296

[StockM4]

Originally Posted by TopJimmy

I'd use 3gal of E85 per fill up of ACN91. If you get any sputter on WOT then back it down to 2gal of E85 next time.

See the link.

https://www.bimmerpost.com/forums/sh...php?p=27644296

Gonna wait to run down all my gas then start with 2 gallons of e85 and fill the rest with 91 and see how it likes it. Just scared to mess something up in the fuel system idk..

[TopJimmy]

You could run down to a half tank and then add 1gal of E... same mix, less wait.

[Twistm4]

Boostane and all those MMT boosters will foul up your plugs quick.

Its a very expensive tank of gas. Much better to just use ethanol and let the ecu swing the trims, tuned or not up to 20% will be fine.

[StockM4]

Originally Posted by Twistm4

Boostane and all those MMT boosters will foul up your plugs quick.

Its a very expensive tank of gas. Much better to just use ethanol and let the ecu swing the trims, tuned or not up to 20% will be fine.

So if i add just 1 gallon of e85 on every full fill up I should be fine..? Without any modifications to my tune…?

[fiveohwblow]

Originally Posted by StockM4

So if i add just 1 gallon of e85 on every full fill up I should be fine..? Without any modifications to my tune…?

As recommended twice, and now a third time, mix a ratio closer to 20% which would be two gallons on a full tank.

16 gallons:
2 gallons of E85 =1.70 E, .3 of 91 octane
14 gallons e10/91= 1.4 E, 12.6 of 91 octane

Totals: 3.1 total gallons ethanol
12.9 total gallons unleaded fuel

3.1/12.9=24% ethanol content

Also of note, E85 is roughly 112 octane
3.1*112=347.2
12.9*91=1173.9

1173.9+347.2=1521.1
1521.1/16=95 average octane rating.

This is rough math but in the zone. There are ethanol calculators which may be more precise, but as also previously mentioned, it doesn’t need to be completely concise, just in the zone. The DME will adjust.

[hellokitty]

I would run E15 and be done with it. Add 2.8 gallons before you fill up with 91. You don't need to add a ton of octane overhead if you are just tuning for ACN91. You are barely making any power anyway… just kidding lol

[StockM4]

Originally Posted by hellokitty

I would run E15 and be done with it. Add 2.8 gallons before you fill up with 91. You don't need to add a ton of octane overhead if you are just tuning for ACN91. You are barely making any power anyway… just kidding lol

Gonna go ahead and try this. And see what my tuner says

[horsepower_and_hounds]

https://www.brewcity**********/about...ol-calculator/

[wuzhatning]

Subbed

[TractionControlDelete]

Originally Posted by fiveohwblow

As recommended twice, and now a third time, mix a ratio closer to 20% which would be two gallons on a full tank.

16 gallons:
2 gallons of E85 =1.70 E, .3 of 91 octane
14 gallons e10/91= 1.4 E, 12.6 of 91 octane

Totals: 3.1 total gallons ethanol
12.9 total gallons unleaded fuel

3.1/12.9=24% ethanol content

Also of note, E85 is roughly 112 octane
3.1*112=347.2
12.9*91=1173.9

1173.9+347.2=1521.1
1521.1/16=95 average octane rating.

This is rough math but in the zone. There are ethanol calculators which may be more precise, but as also previously mentioned, it doesn't need to be completely concise, just in the zone. The DME will adjust.

Masterpiece. Thanks for this

[Wanted_M]

I've been using 1.5 gal of E/91 on the last few fill ups with no issue on my stock CS. No CEL but car seems to run cleaner on pulls but unfortunately I can't log it. I wish BMW had a tool like VCDS for a quick log pull. It's unfortunate that you have to be tuned to log..

Does ISTA have a log feature?

[slaughter.mode]

Just add a gallon or two of E85 per fill, that'll get your Octane up to a ~93 level. I ran a Stage 2 93 tune for almost 6 months doing that, worked great.

[wuzhatning]

would like to add the brewcity calculator is hella confusing to use for me, so i found this calculator which is much easier to use (for figuring out octane with the e85 mix, use their 'advanced calculator' below the first calculator)

https://www.morepowertuning.com/emix

[wuzhatning]

our f82 m4 supposed to have 15.9 gal tank, but i can never pump that much. today i was able to pump 2.2gal of e85 and only 12.2gal of 91 gas, my car said i had 8 miles left at the time of fill up....

the other day i was able to fill a little over 14gal before i couldn't pump anymore, and the time i had like 2 miles left. why is that?

[hellokitty]

Originally Posted by wuzhatning

our f82 m4 supposed to have 15.9 gal tank, but i can never pump that much. today i was able to pump 2.2gal of e85 and only 12.2gal of 91 gas, my car said i had 8 miles left at the time of fill up....

the other day i was able to fill a little over 14gal before i couldn't pump anymore, and the time i had like 2 miles left. why is that?

Because when your range reaches 0 miles, there is still 1 gallon left in the tank.

[wuzhatning]

Originally Posted by hellokitty

Because when your range reaches 0 miles, there is still 1 gallon left in the tank.

So youre telling me i have another 20 miles after 0 mile?? Lol thank you bro 🙏🙏

[TopJimmy]

Originally Posted by wuzhatning

So youre telling me i have another 20 miles after 0 mile?? Lol thank you bro 🙏🙏

Yep, and if running E85 then only 12-15mi left till chugga-chugga. I've run my tank 10mi past — — when switching from 93 to Race Gas, to keep from "mixing down" the octane.