rpm threw the traps need help

We need to know your rear tire size... gimme all of them.. like 275/60/15.


Based on that size of tire you would trap (theorticall of course) in fourth (1:1 ratio) at 166 MPH with 3.73s at 7200 RPMS... 4.30s..139 MPH... 4.56, 131 MPH


Nick

Might as well do the math. Heres one way.

There are 5280 ft/mile. A 26 in dia tire is 2.1667 ft in diameter and 6.801 ft in circumference, so it turns over 775 times per mile. So at 60 mph, which is a mile a minute, the rear tires are turning 775 rpm. The engine rpm is the tire rpm times the axle ratio times the trans ratio, if you have overdrive.

So for a 4.10 gear, no od, 775 x 4.10 is 3180 rpm for the engine at 60 mph.

So the tire rpm at 7000 engine rpm is 7000/ratio, or 7000/4.1 is 1701.

1701/775 is the same as new mph/60, so 60x1701/775 is 131 mph.

Easiest to just do a spreadsheet and try combos.

Generally gear the car so that your finish line rpm is at or just under your planned max rpm.