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jamesm · 12-05-2013, 03:02 PM

I've made the switch to E85 and I'm loving it so far. I've basically just done the scaling part (scaled DI and port injectors) similar to the how-to provided by @mad_sb. It worked very well, and the trims were pretty much dead on without any further adjustment (so far, we'll see again on the next tank). I also leaned out the target open loop afr slightly. i plan to bump the boost to 10-12psi until it's on the dyno.

I will use a dyno to tune the ignition timing for the sake of not running past MBT and blowing up the engine. My ignition map is currently the same as the 93 tune, running around 12 degrees at peak torque and 16-17 at max rpm. I've read lots of different opinions and reviewed lots of logs and the information is all over the place on where to go from here. The general consensus seems to be that E85 likes a bit more timing up top, and maybe a tiny bit more around peak torque but not much. Also most seem to agree that E85 likes more timing in the low-load cruise sections.

So how much timing are you guys on boost with E85 actually running? It'd be very interesting to get an idea of where we're all finding MBT. I'll post my results as soon as i can get on the dyno, but that won't be for a few more weeks.

On a side note, the 'tip in knock' that i was reporting earlier is still every bit as present and behaving exactly the same with the E85, and i can't hear it with det cans, so I'm considering it false knock from now on. Seems reasonable?

12-05-2013, 03:02 PM	#1
jamesm Banned Join Date: Mar 2013 Drives: 2013 FR-S Location: Orlando, FL Posts: 2,929 Thanks: 1,166 Thanked 2,294 Times in 1,180 Posts Mentioned: 313 Post(s)	E85, Boost and Ignition Timing I've made the switch to E85 and I'm loving it so far. I've basically just done the scaling part (scaled DI and port injectors) similar to the how-to provided by @mad_sb. It worked very well, and the trims were pretty much dead on without any further adjustment (so far, we'll see again on the next tank). I also leaned out the target open loop afr slightly. i plan to bump the boost to 10-12psi until it's on the dyno. I will use a dyno to tune the ignition timing for the sake of not running past MBT and blowing up the engine. My ignition map is currently the same as the 93 tune, running around 12 degrees at peak torque and 16-17 at max rpm. I've read lots of different opinions and reviewed lots of logs and the information is all over the place on where to go from here. The general consensus seems to be that E85 likes a bit more timing up top, and maybe a tiny bit more around peak torque but not much. Also most seem to agree that E85 likes more timing in the low-load cruise sections. So how much timing are you guys on boost with E85 actually running? It'd be very interesting to get an idea of where we're all finding MBT. I'll post my results as soon as i can get on the dyno, but that won't be for a few more weeks. On a side note, the 'tip in knock' that i was reporting earlier is still every bit as present and behaving exactly the same with the E85, and i can't hear it with det cans, so I'm considering it false knock from now on. Seems reasonable?