what is a GOOD target lambda for E85 in a 700-800 hp application, 11:1 compression?

0.85-.086 ish? low 12's with gas numbers?

 

I wouldnt start that high. My personnel preference is around .71 If you are on a typical (GASOLINE) wideband, 0.71 lambda will be displayed as 10.5:1. Anything in the 12 afrs W/GAS Sensor is asking for trouble in MY opinion.

 

12's with gas number is fine, because lambda is lambda. 14.7 is 1 volt on the gas calibrated gauge....which means 1 volt lambda with a gas calibrated gauge on e85 would be 9.7:1.

.71 would be 10.5ish and thats sickening. my car starts to clear up at around .82 lambda which is roughly 12.0-12.1...gas numbers and im trying to see how big the window is.

 

i think i mis read your post. i thought you were looking for a GOOD (meaning safe) AFR to start tuning with. Sorry for the confusion.

 

you are tuning to the same lambda as you would with gasoline. You just have a bigger window for error with e85 due to its octane content than that of gasoline.