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Author Topic:   running in high gear
nw15x
Dirt Maniac

Total posts: 129
posted September 27, 2005 01:04 AM  
Using a saginaw 3 speed on a half mile track. Is there any advantage to run in high gear (1:1) vs 1st or 2nd gear. Would the savings in the tranny be offset by the increase in driveshaft and pinion speed.

WesternAuto17
Dirt Forum Champ
Total posts: 569
posted September 27, 2005 08:04 AM  
If the car is traveling at the same speed, the driveshaft speed is the same, whether you're in 1st, 2nd or 3rd (only the engine speed changes).

There is definetaly a benefit in running in high gear. When a 3 speed is in 1st or 2nd, the power is running through a gear set to acheive a higher ratio. In 3rd gear, the power is running straight thru the transmission shaft and not running thru any gear sets. No gear sets = less friction loss.

nw15x
Dirt Maniac

Total posts: 129
posted September 27, 2005 08:27 AM  
lets say you have a 3.0 gear and then switch to a 6.0 gear by using a lower gear the driveshaft would have to spin twice as fast to perform the same work as the 3.0 gear

WesternAuto17
Dirt Forum Champ
Total posts: 569
posted September 27, 2005 01:05 PM  
Your right, I was thinking about it from the wrong angle.

The increased driveshaft speed will hurt nothing.

ARMallardSlayer
Dirt Maniac

Total posts: 175
posted September 30, 2005 06:03 PM  
If you can use a 9" and run the correct gear for rpm you want to turn....then running your tranny in high (1 to 1) is an advantage. It's as close to direct drive as you can get.....it's almost a direct line from engine to rear end.....

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If you can't work em in close & git em in your face with their orange landing gear down, don't bother taking the safety off......

    

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