Looks pretty impressive, i may have to go with something like that. According you your numbers your a tad under 5% slip. A buddy of mine has 18% slip with a 9" non SP converter, so it looks like it works pretty well.
It was really hard for me to see exactly where the Tach was the instant I crossed the finish line so It might have been a little higher. The converter is pretty efficient.
Well with the non SP converter your speed over stall is much lower so you aren't as deep into the coupling of the converter yet so you will be getting more slip.
I've run the SP converters since the late 70's. I've always used stock GM1 converters, originally installed in V6 applications. I've tried turning the converter into low stall and leaving in high stall the entire run and never could really notice much difference. My GSX with a weight of 3960 lbs. without driver, 4140 with me in the seat, at least 1/2 tank of fuel, slicks and open exhaust the car ran a best ever of 12.50 @ 110.89 mph. Running a 118 cam, B4B, pocket port stock Stage 1 heads, 9.25 to 1, 800 QJ that I modified and 3.64 gears. For a basic street car with power levels in the 400hp to 500hp range I'd say the V-P trans is a dynamite set-up, and slip should be 5% area or slightly less. Any conventional converter that stalls more than 10% is most likely a cheaper converter and/or one not designed for the application its being used in. A good (read expensive) converter being used in a combo. it was designed for will most likely fall in the 4% to 6% range. It is difficult trying to determine rpm when you go through the lights. I've never been able to nail that art down, so I set up a video camera last time out and caught it all on tape....for posterity.......with the new engine it came in at 6,400 rpm. Which worked out to be 4.5% slip with the GM1 converter I'm running now (and soon to be changed out for a good conventional trans/converter set-up).
IN my application, since i am turbocharged i make very little hp at low rpm, and would require a very loose converter to get the spool up right. This really eats alot of fuel in city driving. This is where the SP converter wins. If i want to be in a agressive mood, i can use the highstall, if i want to drive like a grandpa, i use the low stall mode. I just wanted to be sure that in low stall mode its efficient. :TU:
