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Old 04-22-2012, 03:17 PM
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auto trans loss ratio of hp

can anyone tell me what ratio loss of horse power you can expect when using a auto trans vs manual. and would one trans be better or worse then another, set up for drag racing.
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Old 04-24-2012, 11:01 PM
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I'd think that it would be a plus to race with autos

hi,
I'd think that it would be a plus to race with autos for then you wouldn't lose the time to shiift and lose HP when doing the shifting.
In an automatic transmission, each gear possesses a device that, under specific rpm and engine vaccuum pressure, will change the gear. In a manual transmission, you are that device. Also, manual transmissions are geared differently, to make up for operator error when shifting. The differences are gears that are easier for the engine to turn, due to circumference of the gear. A higher gear robs horsepower.

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Old 04-29-2012, 08:28 AM
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Autos have the advantage of high stall torque converters for take-off, and consistent shifting. In a manual you have to depend on the clutch and the coordination with your arm moving the shifter. A manual has less power loss, but all it takes is one bad shift to wipe out any advantage.

You also need to consider what type of race you plan to run. In bracket races you need to be very consistent to win, and that will be harder with a manual.

Bruce
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