Engine speed calculator ( to help decide new rear gear set ) - Mustang Evolution

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Old 07-28-2013, 02:40 AM   #1
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Engine speed calculator ( to help decide new rear gear set )

Saw this today on the TV show called Musclecar on Spike TV.

You plug in your transmission gear ratios, your final drive ratio and desired speed and it will tell you your engine speed.

This is great when trying to decide between 3.71 or 4.10's as an example.

Have fun.

http://www.powerblocktv.com/calculators/
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Old 07-28-2013, 09:59 AM   #2
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Kinda neat, but when it doesn't take into consideration drivetrain loss, it's pretty much useless.
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Old 07-28-2013, 11:09 AM   #3
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Should work 100% for manual transmission, correct?
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Old 07-28-2013, 11:13 AM   #4
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No, I think dt loss is 15% on a manual, 25% on an auto, but don't quote me on the #s.
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Old 07-28-2013, 11:24 PM   #5
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What the hell does drivetrain loss have to do when calculating RPM speed for gearsets? This is why I don't watch the "power block" or take anything associated with them seriously. Drivetrain loss has 0 to do with your RPM turning at X speed and the gears in the trans/rear making your tires turn at Y speed. The only way it MIGHT come into account is on an unlocked torque converter.

This site has been around forever, like literally at least a decade and will tell you exactly what your RPM speed should be with your final drive ratio, rear gearset and tire size.
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