Hey guys, not new to these cars at all, but definitely new to tuning. The last L67 car I played with at all was my '98 GS years ago (3.4" pulley, headers, 3.29s, etc), and it was just a car I got very lucky with: the DHP 1.5 BIN worked flawlessly on that car and I never saw anything beyond tiny blips of KR on hot days and, as far as I know, that car still runs great for the current owner.
Now I'm back with another car, an '01 GS, and I'm getting my feet wet into modding again. Last weekend I did a Gen V swap, along with some other stuff. So for now the mod list is:
- 3.6" pulley on Gen V
- Front and rear Powerlogs
- 3" downpipe
- 3" catback
I'm noticing that I'm getting some sustained KR near the end of each gear, along with some blips here and there. At first, I attributed it to the DHP tune, so I went back to stock and started over. Generally, the KR doesn't exceed ~2.8 degrees or so, but on a recent scan I did see one blip of 4.2 degrees which really scared me. I started going through Jerry's Tuning Notebook as a guide and wasted a lot of time on a VE tune until I got back on here and read again that it's probably not worth it. So I did some scans and used Eddie's table tool to try and clean up the MAF tune a couple of times, but to no real difference. As of now, the PCM is stock minus the changes that Jerry suggested for torque management, shifts, etc along with the MAF and VE tables slightly tweaked. I have included the BIN file currently on the car.
Looking at the scans, it seems that my O2 readings are below where they should be, only in the high 800s. This would indicate I'm leaning out, right? Is this too aggressive of spark advance or simply not providing enough fuel? I'm seeing positive LTFTs so I'd think it's too lean in the tune..
I REALLY wish I would have had a more recent scan of the car unmodded, but the last time I scanned it was probably in May '16 when I got an AVT box and dumped DHP 1.5 on it. It had no appreciable KR then, but that was also with good summer fuel down in GA, not to mention being totally stock, right down to the U-bend. I don't know if a combination of the terrible winter-grade 93 octane and the ~55 degree weather is making matters worse here.
I'm in the middle of reading through webracin's tuning guide that Scotty linked to in another thread, there's just a lot to take in right off the hop.
Scan 1: http://superchargedv6.com/tuning/9Mar2017-Scan1.csv
Scan 2: http://superchargedv6.com/tuning/9Mar2017-Scan2.csv