cross multiply
Thread Starter
Racer
Joined: Sep 2002
Posts: 317
Likes: 1
From: Maple Valley WA
cross multiply
To figure out new RPM's for a new gear, use a simple ratio:
old ratio new ratio
---------- = -----------
old RPMs X
Cross multiplying gives (with 3.07 as old gear ratio and 3.73 as new ratio and 2000 rpm's at 65mph:)
3.07X = (3.73)(2000)
3.07X = 7460
X = 2429.96 RPM's for 3.73 gear ratio at 65MPH
Jay
old ratio new ratio
---------- = -----------
old RPMs X
Cross multiplying gives (with 3.07 as old gear ratio and 3.73 as new ratio and 2000 rpm's at 65mph:)
3.07X = (3.73)(2000)
3.07X = 7460
X = 2429.96 RPM's for 3.73 gear ratio at 65MPH
Jay
