i keep thinking it's false knock but i know better, i'm just convincing myself it is lol. It's been driving me nuts since i started tuning the car. if i stay on the gas through it, it'll be gone by around 3.5krpm. if i'm just lightly cruising on the highway it doesn't happen, but if i give just enough so that i'm not quite in boost but you can hear the turbo starting to spin up and hold it there, it'll happen. basically i get a consistent -1 fbkc every time i get into the throttle more than a tiny bit.

i can send them to you if you'd like to look at them. Sorry for all the questions, but just trying to understand a little more of what is going on.Ībsolutely. Seems reasonable?ĭo you have any logs? Is it only right after throttle blips? What are the A/F ratios doing and the ignition advance doing? RPm specific or everywhere? 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. I'll post my results as soon as i can get on the dyno, but that won't be for a few more weeks. 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. Also most seem to agree that E85 likes more timing in the low-load cruise sections. 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. 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. 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 will use a dyno to tune the ignition timing for the sake of not running past MBT and blowing up the engine. i plan to bump the boost to 10-12psi until it's on the dyno. I also leaned out the target open loop afr slightly. 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've basically just done the scaling part (scaled DI and port injectors) similar to the how-to provided by mad_sb. I've made the switch to E85 and I'm loving it so far.

Crusing spark advance of 43 degrees