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      02-06-2017, 11:10 AM   #16
ashburyn54
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Drives: f87 M2
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Quote:
Originally Posted by Mbavar2 View Post
Quote:
Originally Posted by ashburyn54 View Post
You won't run lean on that low of a mix. Your DME will compensate and will hit your target AFR's. The benefit is the extra octane will create a cooler burn and you'll hit your peak timing vs pulling timing.

The fueling problems only begin when your HPFP can't handle the e85 supply. It still targets your target DME AFR's until it crashes. E20-e30 on stock boost won't be a problem.

To take full advantage of E85 you would actually want a leaner tune.
Thanks! When you had HPFP problems, how much E85 were you running? And what type of tune were you on?

That's crazy that the DME can compensate for this.

I think I'd like to continue to use this 2 gallon blend just to up the octane to 93, but I'd also like to be tuned on this blend eventually. With a tune usually you have more timing and what not, would it still be safe to use 2 gallons of E85 with a 93 octane tune (91/E85 blend in tank)? No risk to the HPFP?

Thanks!
When you start pushing your boost up is when I started seeing problems with the HPFP. That being said a tune probably won't run as rich of a target like JB4 on a stock tune. Stock boost levels were fine, car ran great.

So theoretically it could work and it's very plausible, it will have to be just right. Map 1 is an additive map that targets 4psi. Map 2 is the same but targets 6psi over stock. That's around 20-21psi In overboost so we need that E30 blend for knock.

I would see crashes in 4th gear around 7k on the e30 blend in map 1 and around 5.5-6k on map2. Pulled like a train though.

I'm sure PTF could work out a custom e30 map for you. That's our only way short of port injection right now, DME tunes that alter fuel scalers
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