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Richard,
To answer your question, the SPF was runningn a 3.55 rear with a standard Tremec TKO 5 speed. Unfortunatley, it still had the 0.6 overdrive, which was horrible and bogged the car on the long straights, but the rest of the gears worked pretty well. I always meant to upgrade to the 0.8x OD, but sold the car before I got there. The car would run 4th gear from turn 1 to 3, then 3rd from 3 to 5 (it was pretty tached out coming down the hill but not enough to go to 4th before 5), short shift slightly to 4th before 6, into 5th near 7, back to 4th for 9, 5th down the front straight, and back to 4th for 1. The car had a 515 hp 393W with a very flat and wide torque curve. Shift points were normally 6200-6300 rpm except for the short shift before 6. Tires were 26 inch tall Kumhos on 17 inch wheels. I had previously tried a 3.73 rear with the same trans, but that required a 3-4 shift between 4 and 5, then a corresponding downshift for 5. Cost a ton of time and was hard to do all that in such a short time. Also, with the wrong 5th gear ratio in my TKO, the 3.73 actually cost time on the straights because the car would bog so badly after going to 5th gear. With the 3.55, I could carry 4th longer and make up a little time that way. Interestingly (or maybe not), the Z has almost the same physical shift points on the track as the SPF did, and is also (will be) a 1:32 car, maybe even a bit quicker. So far, I've only run 1:34's with it, but I've only had the car there once and have tons of notes to try different rear springs, shock valving, etc the next time I go out. I would be interested in hearing your suggestions for what I maybe should have been doing with gears, etc.
Mike
Mike
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