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Can someone tell me the gain of going to lighter wheel on the back vs ET ?

...........I mean what gain in time for every pound lighter

Dan

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I can tell you! The gain will will be equal to a dead weight loss rule of thumb .1 et per 100 lbs.

The rotational effect wont come into play because the tire will gain rotational speed the whole 1/4 mile. the car just sees the weight as dead weight.

I did the tests many years ago Hoping I would see 1# rotational = 3# of dead weight.

The theoretical gain never occured. The gain was that of the weight alone that was lost as per the old rule of thumb.

I also went as far as removing the rear drums and tested The drums were 40# Guess what 40# of rotational weight was worth ET wise. It was the same as 40# of dead weight.

I did that test over and over a few times.40# on ,40# off, The rotational gain never showed its effect, MEASURABLY!!!

My speculation again was that it was because the tire slowly gains rotation across the whole 1/4 mile ,thus the car sees the weight just the same as dead weight because of that.