tuning LS4
Thread Starter
Joined: Dec 2008
Posts: 1,229
Likes: 24
From: lancaster, pa
tuning LS4 I'm currently helping a local tune his 06 impala ss ls4. I have dabbed in mainly fbodies and looking at the ls4 setup theres tons of more data and tables than I anticipated. in searching on here as well as other forums (hptuners for example), a couple members mentioned "reduce the burst knock air delta table 10%". which table is that? I noticed a section call burst knock retard but I also see 3-4 fill in data followed by the one labeled something like aircyldelta and within that table has values that are whole numbers, meaning you cant enter anything with decimals.
also regarding the spark advance. I noticed that when I was logging a WOT run, it was 28* with 2 degrees of KR at 0.68g, so in theory the car's trying to command about 30-31*. in the high octane table I noticed in the cyl airmass 0.68g it was set at about 34 degrees while in the low octane at about 23 degrees. IIRC the pcm would take the averages of the 2 tables which if correct is about right in the pcm trying to command 30-31 degrees. in the LS1 world, long as premium fuel is used, ppl have copied the high octane table into the low octane table. is this advisable for the LS4 as well?
also the current stock PE enrichment is set at 1.21 or 12.15. aside from the 2* of KR which I imagine GM set the KR on the aggressive side, is it alright if I set the PE EQ to something like 1.18 or 12.5 after possibly lower the KR sensitivity a bit?
also regarding the spark advance. I noticed that when I was logging a WOT run, it was 28* with 2 degrees of KR at 0.68g, so in theory the car's trying to command about 30-31*. in the high octane table I noticed in the cyl airmass 0.68g it was set at about 34 degrees while in the low octane at about 23 degrees. IIRC the pcm would take the averages of the 2 tables which if correct is about right in the pcm trying to command 30-31 degrees. in the LS1 world, long as premium fuel is used, ppl have copied the high octane table into the low octane table. is this advisable for the LS4 as well?
also the current stock PE enrichment is set at 1.21 or 12.15. aside from the 2* of KR which I imagine GM set the KR on the aggressive side, is it alright if I set the PE EQ to something like 1.18 or 12.5 after possibly lower the KR sensitivity a bit?
