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

[fiveohwblow]

Originally Posted by 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.

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?

Literally two posts up lol

[pikkagtr]

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

Nice and healthy numbers

[trungnguyen28]

Originally Posted by fiveohwblow

Literally two posts up lol

Lol apologies, missed it by a mile. I should've asked for logs some people get knock and don't even realize it.

[fiveohwblow]

Originally Posted by trungnguyen28

Lol apologies, missed it by a mile. I should've asked for logs some people get knock and don't even realize it.

Very true. At the time I didn’t have an e30 tune available to me and have since moved on so I can’t help you there. I’m sure someone can!

[horsepower_and_hounds]

So you did 3 pulls of true 93 and one pull of 91 with 3.5 gal of E85? Which maps did you test? stg 2 91 and which 93? Did you have 93 oct or did you just add E85 to make 93 which would have been 94 by the calculations

Post one from each map...

So if you mixed correctly and put in 3.5 then topped off with 91 to fill the tank and drove it around to mix and all fuel was good you 91 would be higher oct then the 93
94 Octane
% Ethanol is 26.72 or same as E27 if total Gals is 15.70

[trungnguyen28]

Originally Posted by horsepower_and_hounds

So you did 3 pulls of true 93 and one pull of 91 with 3.5 gal of E85? Which maps did you test? stg 2 91 and which 93? Did you have 93 oct or did you just add E85 to make 93 which would have been 94 by the calculations

Post one from each map...

So if you mixed correctly and put in 3.5 then topped off with 91 to fill the tank and drove it around to mix and all fuel was good you 91 would be higher oct then the 93
94 Octane
% Ethanol is 26.72 or same as E27 if total Gals is 15.70

I'm from CA where we don't have 93. And the calculator depends on which one you use, if you count E85 as 100 octane or 105 or more. Some CA 91 has been rated lower and I wanted to make sure I was at slightly above 93 octane. I used a calculator that considered E85 as 100 octane and had me at 93.1 or so octane.

I only did 1 pull of Stage 2 91 Octane because it was almost identical numbers and graph, the 93 octane map was SLIGHTLY smoother per my dyno operator. The 93 vs 91 map is the 3rd picture posted.

In conclusion, I am now on the 91 map and going to run less E85 in the future.

[horsepower_and_hounds]

Originally Posted by trungnguyen28

I'm from CA where we don't have 93. And the calculator depends on which one you use, if you count E85 as 100 octane or 105 or more. Some CA 91 has been rated lower and I wanted to make sure I was at slightly above 93 octane. I used a calculator that considered E85 as 100 octane and had me at 93.1 or so octane.

I only did 1 pull of Stage 2 91 Octane because it was almost identical numbers and graph, the 93 octane map was SLIGHTLY smoother per my dyno operator. The 93 vs 91 map is the 3rd picture posted.

In conclusion, I am now on the 91 map and going to run less E85 in the future.

Ok so to specify you ran 91 & 93 but both were stg 2?

[trungnguyen28]

Yep!

[horsepower_and_hounds]

Originally Posted by trungnguyen28

Yep!

Thanks for the clarification

[m3elmo]

Originally Posted by trungnguyen28

In conclusion, I am now on the 91 map and going to run less E85 in the future.

this is helpful - for extra clarification you'll run the 91 ACN Map with less E85. Are you thinking 1 Gal per tank or 2?

[trungnguyen28]

I'm going to run the regular 91 map NOT the ACN map with 2 gallons of E85 which should put me at 92 octane if E85 is 100 octane.

[jballer123]

I just spent a day logging 2 gallons of e85 to a full tank of shit 91, running stage 1 acn 91, and there is no knock, but it is still pulling 2to3 degrees of timing through out the rpm increasing to 7,000 rpm. It defintly pulls way smother than straight 91, and you can feel the power increase and throttle response is better!

[m3elmo]

Originally Posted by jballer123

I just spent a day logging 2 gallons of e85 to a full tank of shit 91, running stage 1 acn 91, and there is no knock, but it is still pulling 2to3 degrees of timing through out the rpm increasing to 7,000 rpm. It defintly pulls way smother than straight 91, and you can feel the power increase and throttle response is better!

That' good feedback - so that means that even the Stage 1 91ACN is still on the aggressive side. Curious how much timing did it pull before without the E85?

[jballer123]

Originally Posted by m3elmo

That' good feedback - so that means that even the Stage 1 91ACN is still on the aggressive side. Curious how much timing did it pull before without the E85?

Here's the log at 6,500 rpm, thats always my reference point , and see the smooth pull also, an easy visual.

[gosutony]

So weird how you guys had knock on the high end of the RPM bands, I had a knock on the low end RPM range going from 4th to 3rd on Stage 2 91 map, no knock on Stage 2 91 ACN obviously. Maybe I need to add more E85 in on a full tank, I only did 2 gallons vs the 3 gallons.

[jeremyuhh]

Don’t wanna start a new thread but I did just this and my oil temp shot up from normally being in between the 2 lines before 250 to just a tick above the line closest to 250.

Went to one of my M modes and temps normalized back to between the lines.

Went back to comfort and temps went back up. I know comfort runs hotter for efficiency reasons but any idea why this would happen? Maybe car adapting to more consistent combustion since the octane went up ?

I’m in Ca using crap 91 as well. BM3 stage 1 acn91 tune