e85 timing sweet spot?

[b4black]

If you run E85 on the octane rating engines, you will get about 95. The octane engines can't account for the cooling effects of ethanol very well.

It's effective octane is more like 105 and it's blending octane (for low levels blends like E10) is more like 115.


If E85 were only 94-95, it would not perform way better than 93 premium.

 

[GTPpower]

from everything ive ever read e85 is around 104-105 octane, unless its made with good gas as the 15% gas then its around 112

The true octane rating is in the 94-95 range. Due to it's latent cooling effect, it performs similar to 105-110, which is why you typically see that.

 

[TurboTPI]

Well it was hot (89 degrees, full sun) but still managed a 13.1 @ 106 today. Im happy with that considering i ran that hot lapping my car in this heat. It should be a 12.9 car in alittle cooler air for sure. This was with a 3.2 pulley, non intercooled @ 20 timing.

 

[m_dogg]

 

[Xtant12]

I always ran more boost and less timing, I had an unintercooled m90 car on e85, it was a l26 bottom end so it was a little more compression but I ran stock timing and a 3.0 pulley seemed to like that

This guy knows his stuff! He piratically built my motor from his tech support. He always told me what way to go and what I would need. I never gave him his props!