Racer Roy wrote:Hey gang:
I have been doing some thinking and have a situation that does not make sense.
I would love some input about how to figure out what my RPM change will be when I change gears.
I am currently running a 3.73 rear in second gear in a TH350, which is 1.52. This gives: 1.52x3.73=5.66 total. I am turning 5200 this way.
Another car is using 2.73 rears in the 2.52 FIRST gear(TH350) for 2.52x2.73=6.87 He is turning 6000 this way. (same tires too)
Now the confusion comes from my "ARC Industries" gear calculator slide rule. It says the RPM difference between a 6.87 total to a 5.66 should be 1500 RPM.
Does anyone have a more accurate way to find out what my RPM will be?
I am trying to see what I would gain by going to a 4.11 final drive with the 1.52 second gear(6.24 total) My slide rule says that should be approx. 800 rpm
Thanks for any suggestions.
Cobra wrote:In making scientific calculations you can significantly change results by rounding wrong figures. Using 6.88/5.67 would give us 1.2134X5200= 6309.7002, which is incorrect. Multiplying figures is a prime example of this case.
jacksoni wrote:Does convertor slippage differences between the two cars factor into this somewhere as well?
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