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robertway · 03-09-2010, 01:58 PM

I have just gotten done recalibrating my MAF sensor for the RotoFab intake I have and also just installed my Kooks 1 7/8" headers. I have my AEM wideband installed and am tuning based on Lambda for E10 so I have Stoich AFR set at 14.137. I tuned the MAF in Open Loop and have the Lambda Error at +/-2% across the full range of the MAF Sensor. I did all the MAF tuning at Partial throttle never going over 4500 rpms since I had PE disabled. After all the partial throttle work, I put the new MAF mapping into my main tune, extrapolated out past 6000hz to extend the correction trend out into the WOT range and then did a single WOT run to try and see where I was at. The good news is, it looks like the MAF is +/-2% all the way through to redline but there are two things I need to address. The Commanded fuel is a flat line at 0.80 Lambda (11.31 AFR for E10) and I would like to get the car to command 0.85 so I have to richen up the PE Ratio but during the WOT run I noticed a lot of knock throughout the run. It started to knock a little bit at the beginning of the run, maybe 1 degree, and it pulled a bit of timing, then again 1.1 KR at 3700rpms and it pulled a few more degrees but then at 4600rpms the knock sensor read roughly 4 through the end of the pull.
So the question is, where do I go from here, I know I have to pull some fuel to get to 0.85 commanded lambda but if I pull fuel I am assuming it will knock even more. So is it best practice to get rid of the knock first or get the commanded lambda in line first.

Thanks in advance...

03-09-2010, 01:58 PM	#1
robertway Drives: 2012 Challenger SRT8 Auto Join Date: Sep 2009 Location: Central New Jersey Posts: 839	Tuning WOT on an LS3 with Knock I have just gotten done recalibrating my MAF sensor for the RotoFab intake I have and also just installed my Kooks 1 7/8" headers. I have my AEM wideband installed and am tuning based on Lambda for E10 so I have Stoich AFR set at 14.137. I tuned the MAF in Open Loop and have the Lambda Error at +/-2% across the full range of the MAF Sensor. I did all the MAF tuning at Partial throttle never going over 4500 rpms since I had PE disabled. After all the partial throttle work, I put the new MAF mapping into my main tune, extrapolated out past 6000hz to extend the correction trend out into the WOT range and then did a single WOT run to try and see where I was at. The good news is, it looks like the MAF is +/-2% all the way through to redline but there are two things I need to address. The Commanded fuel is a flat line at 0.80 Lambda (11.31 AFR for E10) and I would like to get the car to command 0.85 so I have to richen up the PE Ratio but during the WOT run I noticed a lot of knock throughout the run. It started to knock a little bit at the beginning of the run, maybe 1 degree, and it pulled a bit of timing, then again 1.1 KR at 3700rpms and it pulled a few more degrees but then at 4600rpms the knock sensor read roughly 4 through the end of the pull. So the question is, where do I go from here, I know I have to pull some fuel to get to 0.85 commanded lambda but if I pull fuel I am assuming it will knock even more. So is it best practice to get rid of the knock first or get the commanded lambda in line first. Thanks in advance... __________________ "When the people find they can vote themselves money, that will herald the end of the republic." - Benjamin Franklin LS3 Camshaft Swap Do-It-Yourself Instructions - 2010 LS3 gone but not forgotten!!!