Quote:
Originally Posted by sd2649
So, you will be able to tune these with the stock ecu easily? The advantage to e85 would be the octane rating? That is a very slick setup, I have always loathed the limitation imposed by the fuel injectors...
|
Yes. I've run E85 on several other cars now with no fuel tuning other than properly oversized injectors, and an adjustable fuel pressure regulator for fine tuning. The idea is pretty simple really, E-85 takes 30-35% more flow than gasoline to get the same AFRs, so based on that I calculate the flow I need and through a combination of injector sizing and base fuel pressure I can get it dialed in to run more or less like stock. The oxygen content of E85 is so high that you'll typically see 5-10% power increase from that alone and also be able to run a LOT more timing advance.
E85 has an octane in the neighborhood of 105, but due to the fact that you run it so much richer, it typically runs cooler at best-power mixtures so it acts more like 115+. It's damn near impossible to get detonation with E85, even with stupid timing advance and boost levels. Also, best power is around 12.1:1 AFR and there's nothing to be gained by leaning it out so all around it's a very safe fuel to tune on. $2.20 a gallon for some of the best race gas you'll ever use is hard to beat
I'm going to be pretty busy at work for the next few days, but hopefully I'll be ready to start it on E85 by the end of the week. If my other cars are any indication, it should run like a champ.