So other than the tach registering double the actual RPM (pcm see's it fine) the car is awesome. Even got to tuning it in SD mode with the MAF in the trunk. We're doing a gas mileage test to prove that SD tuned properly is just as good as MAF only without the whole intake ducting issues. We even have proof that the rotation of the MAF can change things up. Before the tune it was constantly around 118 BLM. This means the MAF tables were reporting too much air flow than what was actually getting into the motor. With just rotating the MAF 90 degrees back to it's stock "clocking" the BLM's went to 124 and the "split" decreased from 6 down to 2. Scientifically I can explain it but it's easier to just point and say, DUH, MAF's aren't as great as people think they are. They can screw up just as easily and limit you just like how MAP limits you.
We'll have the conclusion about mileage and 1/4 mile performance between the 2. This is what happens when you get 2 engineers together to futs around with a high performance car... we prove things that don't matter to 99% of the world :P . I'm guessing the times will all be within a tenth of each other. Also, it's pure 87 octane.
With the OBD-I pcm it's a lot easier to tune and more "complete." We'll be adding a switch to enable and disable the built in shift kit from GM. I can even tune the performance shifting tables with line pressure vs gear and even the upshift and downshift speeds all vs TPS (obviously). It's a blast and makes me want to get a 4L60E
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, Jon
Owner of a Red Sled.
If it\'s EFI I can tune it. Specialize in 82-95 GM (yes Lt1\'s)
\"If you can leave black marks on a straight from the time you exit a corner till the time you brake for the next turn.......Then, you have enough horsepower\" - Mark Donohue
. Only a week after we got done with the SD tuning. He got a best mpg, 21.8 average when in above his normal traffic. Nothing was changed except the SD tuning and the "shift kit" that I programmed in. We didn't get a chance to take it to the 1/4 mile but it felt the exact same.
