Technical > Dan Dishon's Transmission Den

Rearend gear ratio advice wanted

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Supercat:
I run 3.89 gears and same Hoosier as OP.
We run through the lights at about 7800rpm at 192mph 7.2-- ET. 1.01 - 1.05 60 ft.. 3800 to 4200 launch rpm.
Check the converter as others had mentioned

Dunc the Funk:
Thanks for responses. We don't have a data logger so I'm getting the rpm figure from onboard camera. I have reviewed the footage & it's actually only about 7500 rpm on a 178 mph run.

Using a slip calculator eg TCIs gives a figure of 11.8% (assuming no tire growth). Supercat's numbers indicate only 2.57%. At launch our motor always goes straight to 5000rpm so I guess our converter is looser? What is a normal range of slip?

Frontenginedragsters:
Many years ago ATI would tell us that 5% slip was a good convertor.
This was years before data recorders became common.
He used to figure it out with the Moroso slide rule.

Supercat:
At the finish line my car,  just ahead of the rear tire, is about 6 inches off the ground. So tire growth would be 4 to 6 inches anyway.  How does that change your numbers?

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