I have tuned quite a few 2010 SS's with LS3 conversions (VVT and AFM delete) using my cam (224/236 114) and an FTI 3000 converter and all seem to work quite well.
This car came in after being done at another shop and has a larger cam, 235/242 114, and a PI 3000 converter as well as a stock TB. Everything is great as far as the trans and driveability. The issue is slow speed rolling idle.
When it first starts it will surge slightly and take a steady idle. Initial entry into drive or reverse gives some surge but settles pretty quickly. The load does change as the kpa will go from low 60's to about 70 or so. So it seems this converter is a "tight idle" 3000 stall. The fuel seems to be within 2-3% so
Now as far as I know there is not different idle airflow tables from park/neutral to drive reverse. Please correct me if I am wrong here.
So here is the tune that seems to be the best so far as well as a log. You can see that just off idle and at 2-4 MPH or so it just continually surges the idle up and down. It seems to be a lot better with the AC off, but still there and rock solid either with the AC on or off once coming to a stop.
My first thought is that since I am so perfect (haha - not) and tuned a bunch of these, that it must be the different loads it sees from park to drive. Thinking that I figure a looser converter would be better. But I have made my smaller cam work decent at a 650-700 idle and a stock converter.
I looked into a idle setup sequence by Bill Winters, but it is E40 LS2 based and on an M6. If there is a E38 specific idle prodedure out there, I missed it and would like to know where to find it. This is the first E38 I have had an idle issue with.