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cjperformance · 10-17-2021, 12:43 PM

Got a chance to do a couple WOT pulls. Words can not describe how much better it is running now.

Ambient temps are way down today compared to most of my other logs, so it's running fantastically on the colder air. MAF lb/min are higher than I've seen previously, peaking at around 80 lbs/min a couple times. Prev was around 72 lbs/min max in warmer weather.

So that's due primarily to the temperature. Now on to the changes due to the high side change.

First thing I looked at was injector pw. We are down to about 4.5ms max! With the LT1 system, i'm sure it would have been exceeding 6.2 in this temperature. I do need to adjust my PE to be a little richer as the LT4 setup is tending to run just slightly leaner with the same MAF calibration. I prob should have added 5% fuel before doing the run, but instead I just did progressively longer WOT runs while watching AFR. Until I was comfortable it wasn't going to go crazy lean.

Also still getting some KR in oddball places. Thought I had that nuked with my last set of timing changes, but since AFR is now around .825-835 at WOT instead of the previous .800 with the LT1 fueling, it may be solved by adjusting my PE with the new LT4 stuff to be a little lower. KR is frequently coming on after my foot has been down for a while, and manifold temps are coming back up. Overall, commanded is sticking to actual AFR within a percent or two except for a couple of areas that might need tweaking.

Best of all, I verified that the gas station just 1 mile from my house sells E85. So I def think some E is in the very near future. I dont have a ton of info on the E85 tune changes required, but Goat Rope Garage has a vid on that, and it didn't look too bad. Just make sure your stoich tables are set up, and then figure out how much timing to add at each eth % level. My understanding with the LT4 high side, is I'll probably be limited to around E50 at the most. Prob going to do whatever I can to keep the inj PW lower than 5.5ms. I dont want to get back to that borderline state again and start maxing out the system again.

Going to try to get the PE AFR back down around .80-.81 and then I think maybe another run at the track will be safe.

10-17-2021, 12:43 PM	#179
cjperformance Drives: 2017 Camaro SS 50th Anniversary Join Date: Apr 2021 Location: Missouri Posts: 950	Got a chance to do a couple WOT pulls. Words can not describe how much better it is running now. Ambient temps are way down today compared to most of my other logs, so it's running fantastically on the colder air. MAF lb/min are higher than I've seen previously, peaking at around 80 lbs/min a couple times. Prev was around 72 lbs/min max in warmer weather. So that's due primarily to the temperature. Now on to the changes due to the high side change. First thing I looked at was injector pw. We are down to about 4.5ms max! With the LT1 system, i'm sure it would have been exceeding 6.2 in this temperature. I do need to adjust my PE to be a little richer as the LT4 setup is tending to run just slightly leaner with the same MAF calibration. I prob should have added 5% fuel before doing the run, but instead I just did progressively longer WOT runs while watching AFR. Until I was comfortable it wasn't going to go crazy lean. Also still getting some KR in oddball places. Thought I had that nuked with my last set of timing changes, but since AFR is now around .825-835 at WOT instead of the previous .800 with the LT1 fueling, it may be solved by adjusting my PE with the new LT4 stuff to be a little lower. KR is frequently coming on after my foot has been down for a while, and manifold temps are coming back up. Overall, commanded is sticking to actual AFR within a percent or two except for a couple of areas that might need tweaking. Best of all, I verified that the gas station just 1 mile from my house sells E85. So I def think some E is in the very near future. I dont have a ton of info on the E85 tune changes required, but Goat Rope Garage has a vid on that, and it didn't look too bad. Just make sure your stoich tables are set up, and then figure out how much timing to add at each eth % level. My understanding with the LT4 high side, is I'll probably be limited to around E50 at the most. Prob going to do whatever I can to keep the inj PW lower than 5.5ms. I dont want to get back to that borderline state again and start maxing out the system again. Going to try to get the PE AFR back down around .80-.81 and then I think maybe another run at the track will be safe. Attached Images