I am running a SD tune on my 98 (02 PCM) H/C FI vette, and have run into a strange issue
My VE table has very low #s in the 400-4000rpm to about 80 KPA compared to every table Ive seen or tuned (stock, modded, etc)
I have 19s-20s through around 400rpm-2000rpm and 35KPA. When I set up and scan STFTs, It just keeps me pulling and pulling until they are that low. I know they #s are not correct because once they are low, I get tip in, and when I start the car warm, it will go to flat line (18 afr) on my onboard wideband.
I really want to tune it with the STFTs because of the ease, but something is obviously not right. I am not a veteran tuner, but have tuned the MAF and VE tables on several cars with great success, and never seen this before.
NOTE: For what its worth, the car was DEAD ON when I had the 98 PCM in, but although the car is strong and runs good, I have never gotten all of the bugs out of it since the swap.