E85 / 93 40/60 logs

[Ak335i]

Ok so my car just didnt like 50/50 E85 on map 7 or 5 Logged for days and emailed with T for days as well.

I dropped down to 40/60 now and ive done 20 or more WOT including 2/3 and 3/4 shifts and finally no codes or limps.

I had to set future usa A=2 and open loop to 75 and raise the PID damper a touch

My problem has been slight over boosting post shift which then causes a very brief throttle cut.
I will be upgrading to the G5 in the next month or so as per Terrys advice

To get me by for now, what do you guys think of these logs? The only thing im not loving is the post 2/3 shift, that lean spike like i said they all look similar to these now, but no codes any more, no limps after about 20 pulls like this

[Ak335i]

the slight post shift overboost causes a slight throttle cut one 1 out of 5 runs or so. I can't feel them on the road , but was feeling it on the strip last week. So far over 20 pulls and no codes or feeling of throttle cut. but you can see it a little on the log. I'm afraid if I take it to the track tonight I'll feel it as the tires may grab and not slip a little during shift like they do on the road.

[Ak335i]

no thoughts?

[Sticky]

no thoughts?

Just a lot of other threads going on, let's see what people say. Bump.

[Ak335i]

well I'm back from the track. I had to let it autoshift into 3rd or I got throttle cut. ran 3 12.7s in a row like this but if I could only shift to third around 6200... man o man

[Terry@BMS]

Let's see a log of the track runs. Unless your throttle is closing more than 60% and staying closed for a few hundred RPM it's not related.

[Ak335i]

emailed ya terry

[Terry@BMS]

emailed ya terry

Got it. Definitely not a throttle issue. It's a fuel pressure issue. Since you are using E85 you should be using map 5, which will lean the AFR out on its own. But if you want to use the G4 map 7 curve on E85 manually change the AFR values all to 0 and relog. That should take some stress off your fuel system and the E85 prefers to run leaner anyway.

[Ak335i]

ok. will do and log in the morning. thanks T

[Ak335i]

Got it. Definitely not a throttle issue. It's a fuel pressure issue. Since you are using E85 you should be using map 5, which will lean the AFR out on its own. But if you want to use the G4 map 7 curve on E85 manually change the AFR values all to 0 and relog. That should take some stress off your fuel system and the E85 prefers to run leaner anyway.

THANKS! I knew to lower them and tried before lowering a bit, but didn't kno to literally zero them out.. I set everything back I.e. future useA=0 and Pid damper 5 then zerod the afr settings
and it auto learned to 90.. no codes, no fp drops and no throttle cuts and my quick 6200 shifts are back. I'll send ya some csvs.

[dzenno@PTF]

E85 prefers to run leaner

What AFR do you target on E85?

[Terry@BMS]

What AFR do you target on E85?

On the stock flash we run it close to the OEM curve of 14:1 down low and 12.5:1 up top. With our flash closer to 12.5:1 across the board and a bit richer on tip in.