fejjj

I think I have finally gotten rid of all my boost leaks and I was seeing 12.0-1 AFR'S at WOT tonight.

What do you guys consider as being too lean?

I know that E85 cools the intake charge more and therefore itīs more knock resistant and can handle more boost and it also makes the engine run cooler.

Thank you

bw993

11.3-4 AFR with M-tune and E85 (WOT at 20.5 PSI boost). I am using an adjustable FPR and my fuel pressure is set at 44.5 lbs.

fejjj

I have an M tune as well running 17-18 lbs of boost and Joshua told me when I was at 11.2 that that was too rich.

So back to my original question... What is the ideal AFR at WOT running E85 and what is too lean?

blown 944

I shoot for 11.7-12.0.

I try to be around 12.5 up to peak torque, fattening uo right before Tgen leaning out after 5500 rpms.

I've picked up to over 130 mph leaning out the top end to 12.2

So, it's not a simple answer, but anything over 12.5 when in boost, I'd consider too lean. However, I have made a full pass at 12.6 without hurting anthing.

fejjj

Sid,

Thank you for responding.

I greatly appreciate and value your opinion!

blown 944

To add to this in case you've missed it in the past, I run a lean burn tune to her decent mileage under light load. I try to run around 17-18:1and a little over 40* timing for highway driving.