Best fuel/octane for SC M3

[Longboarder]

Originally Posted by Mike Benvo

Shouldn't be running leaner with e85 after adaptations take place. A targeted lambda will be met regardless of the fuel type. Putting e85 in just means that the fuel trims will be higher to reach the target.

Hi Mike, when we tested my car on a little E, AFRs were definitely higher across the RPM spectrum. I have a lot of data over 100 dyno pulls with lots of different combinations.

[BPMSport]

Originally Posted by Longboarder

Hi Mike, when we tested my car on a little E, AFRs were definitely higher across the RPM spectrum. I have a lot of data over 100 dyno pulls with lots of different combinations.

Then you may be at the upper limits of your fuel system, or not enough adaptation time has taken place.

[Longboarder]

Originally Posted by Mike Benvo

Then you may be at the upper limits of your fuel system, or not enough adaptation time has taken place.

Well certainly wouldn't have been the upper limits of the fuel system when my AFRs are distinctly higher at 3,000 RPMs on e25 compared to a pull at 3,000 RPM on conventional gasoline (e10). Again, AFRs were higher across the entire RPM spectrum. Not just higher at 8,000+ RPM.

Adaptation time? Well I can't prove that it wasn't still adapting so I can't say that it wasn't happening. But it doesn't really matter as it has been running great for a very long time now.

Tell ya what, come to NoFlyZone April 2 (I'm already signed up) and gas up your Harrop blown M3 with 100+ octane or C16 or whatever you want and race me and I'll be on my daily drive mix of 91 octane with a couple gallons of E to blend to e25, like I have been doing for a year now with no issues. Then you will see how good the e25 is.

[BPMSport]

Originally Posted by Longboarder

Well certainly wouldn't have been the upper limits of the fuel system when my AFRs are distinctly higher at 3,000 RPMs on e25 compared to a pull at 3,000 RPM on conventional gasoline (e10). Again, AFRs were higher across the entire RPM spectrum. Not just higher at 8,000+ RPM.

Adaptation time? Well I can't prove that it wasn't still adapting so I can't say that it wasn't happening. But it doesn't really matter as it has been running great for a very long time now.

Tell ya what, come to NoFlyZone April 2 (I'm already signed up) and gas up your Harrop blown M3 with 100+ octane or C16 or whatever you want and race me and I'll be on my daily drive mix of 91 octane with a couple gallons of E to blend to e25, like I have been doing for a year now with no issues. Then you will see how good the e25 is.

Doesn't matter to me if your M3 is faster than mine or not. I don't have time for events. I never disputed the results on e25. My M3 is a garage queen at this point.

If I had the time for one of those events I'd take my M5 anyway.

I'm glad your mixture is working out well

[777eThOd*]

Hmm. Any VF Owners running a E85 mix with 93? I kinda want to try it out now..

[8k4]

Don't bother if you have 93