Hello everyone,
So I will start off by saying I am new to tuning. I have read a lot and I have had a few people help me, but I still have questions. I have a 2009 LSA supercharged stock from GM Gen 4. I have a pretty good base tune as the car runs pretty good as is. I did just do a muffler delete and I feel like I have lost a little bit of power, so I thought it would be good time to try and clean it up some before I do anything else. Is it possible to lose some back pressure with the muffler delete and make it not pull as hard now? Just curious! I have added my most recent tune along with my last scan. I think I am getting pretty close with my MAF at this point. I have also added at the bottom of this post a list of things I have turned off to do closed loop tuning and force it to run only on the MAF. Please let me know if I missed anything, or if I made changes I should not have. These settings are what I have read or had someone help me with.
So here are a couple of questions I have:
1. When tuning the MAF what is the correct way to drive to get an accurate scan. I have seen where one person says to sweep across the Hz and try to fill as much data as you can with smooth transitions. Then I read where someone says to try and hold the throttle in each cell until the values level out. I sort of feel like holding the throttle in each cell until they level out would be best, but I am uncertain.
2. When tuning the MAF when does PE come on? Can I tun the entire MAF just by trying to hold the throttle in each cell all the way to WOT? Not really realistic as I would be going way to fast to do that. I have read that after roughly 5700Hz PE starts to come on and really anything under that would be where I want to target my MAF tuning. Then do another scan trying to start above this Hz and do a single gear run to WOT. Then tune the second half of the MAF this way. I am a little confused about what is correct. How do I know when PE will come on for certain?
3. I have been copying the entire MAF error and multiplying by % half to the calibration. But this tends to change the parts of the scanned Hz that are good (I am shooting for +-1 or 2 max across the board). If I have enough hits in the cell to give me good data, can I just add in or pull out fuel per cell to make it fall in my target? Or maybe highlight a few cells and extrapolate to smooth it out? I am not sure the best procedure to dial this in. Using the entire table gets me REALLY rich to the point I have a really bad flat spot off idle. So I have started over a couple of times now.
Well that is all I have for now. Please don't beat me up to awful bad for the newbie questions.
Thanks
scan8.hpl
MAF_Step5.hpt
Closed Loop Settings
Engine, Fuel, Cutoff
Disable DFCO by setting "Deceleration fuel cutoff"
Set Enable RPM = 8100
Set Disable RPM = 8099
Engine, Fuel, Temp Control
Set COT to disable
Engine, Fuel, Oxy Sensors
Set "O2 Readiness ECT" to 400*
Engine, Airflow, dynamic
Disable Dynamic Air by
Set High RPM Disable to 100
Set High RPM Re-enable to 99
Spark, Advance,
Subtract -5% across spark table