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| Pontiac - Boost Turbo, supercharged, Nitrous, EFI & other Power Adders discussed here. |
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#1
10-27-2015, 11:36 AM
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Thanks Tom! Yeah, I want to change the gear to a 3.25 or 3.50 set if I keep 28" tires on it. That's why I put the 30" slicks on. Trying to kill some gear. With the 30's my final ratio is 3.37. I don't know if I like the way the 30's feel with swaying sometimes, so I may go with a 3.50 gear and 28's. I don't know yet, but I know that I do like driving it with a higher gear so far.
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#2
10-27-2015, 01:20 PM
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I'm going with a 3.60 and a 31" tire on my setup. I do have a 4 link and fairly wide tires.
I like to chart the tire, gear, rpm combo. Makes it easy to see where you really are. Looks like this. ---------------------------------------------------------- rear tire - 31" tall, 5843 multiplier rear gear 3.60 trans gears multiplier 1 2.33 0.01099 2 1.48 0.01731 3 1.00 0.02562 OD 0.778 0.03292 1 2 3 OD RPM | 8.388 | 5.328 | 3.600 | 2.801 | --------------------------------------------- 750 | 8.2 | | | | --------------------------------------------- 1000 | 11.0 | | | | --------------------------------------------- 1250 | 13.7 | | | | --------------------------------------------- 1500 | 16.5 | 26.0 | | | --------------------------------------------- 1750 | 19.2 | 30.3 | | | --------------------------------------------- 2000 | 22.0 | 34.6 | 51.2 | | --------------------------------------------- 2250 | 24.7 | 38.9 | 57.6 | 74.1 | --------------------------------------------- 2500 | 27.5 | 43.3 | 64.1 | 82.3 | ----------------------------------------------- 2600 = 86 mph cruise 2750 | 30.2 | 47.6 | 70.5 | 90.5 | --------------------------------------------- 3000 | 33.0 | 51.9 | 76.9 | 98.8 | --------------------------------------------- 3250 | 35.7 | 56.3 | 83.3 | 107.0 | --------------------------------------------- 3500 | 38.5 | 60.6 | 89.7 | 115.2 | --------------------------------------------- 3750 | 41.2 | 64.9 | 96.1 | 123.5 | --------------------------------------------- 4000 | 44.0 | 69.2 | 102.5 | 131.7 | --------------------------------------------- 4250 | 46.7 | 73.6 | 108.9 | 140.0 | --------------------------------------------- 4500 | 49.5 | 77.9 | 115.3 | 148.1 | --------------------------------------------- 4750 | 52.2 | 82.2 | 121.7 | | --------------------------------------------- 5000 | 55.0 | 86.6 | 128.1 | | --------------------------------------------- 5250 | 57.7 | 90.9 | 134.5 | | --------------------------------------------- 5500 | 60.4 | 95.2 | 140.1 | | --------------------------------------------- 5750 | 63.2 | 99.5 | 147.3 | | --------------------------------------------- 6000 | 65.9 | 103.9 | 153.7 | | --------------------------------------------- 6250 | 68.7 | 108.2 | 160.1 | | --------------------------------------------- |
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