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Author Topic:   Gear Change ?
Kromulous
Dirt Forum Champ
Total posts: 796
posted May 19, 2004 10:33 AM  
All things being the same (tires etc) how many more rpm's will going to 6.00 gear, from a 5.43 ?

Just looking for a ballpark figure really.

udecide66
Dirt Freak

Total posts: 229
posted May 19, 2004 12:45 PM  
I would say around 900-1200 RPM gain
I recently switched from 5.43 to 5.67 and gained 400 RPM
I was told you gain 300-500 RPM for every step in gears (5.43,5.67,5.83,6.00 etc...)depending on engine.
If you gain more than what is expected I would say you are spinning your tires.
I don't know how much truth is to the above statement but it has worked for me in the past.
Hope this helps.

NJantz
Dirt Forum Champ
Total posts: 755
posted May 19, 2004 12:54 PM  
Theoretically you're looking at a 10% change in rpm. Which is basically the same thing undecide66 came up with.

Kromulous
Dirt Forum Champ
Total posts: 796
posted May 19, 2004 01:14 PM  
Thanks folks, exactly the info i was looking for.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted May 19, 2004 01:32 PM  
It would also depend on your engine and if the change in gear gets the engine up to its peak rpm range then it will pull harder and gain rpms that way too.
In my experience i havent seen more than about 200 rpm per gear set. But we rarely ever go more than 1 gear up or down and the enigne is in roughly the same rpm range.

nolimit92
Dirt Forum Racer

Total posts: 97
posted May 20, 2004 09:11 PM  
It also depends of how much wheel spin you have. I can change from a 5.43-5.83 and run 100 rpms differerence. It seems we always pull around 7300 everynight, regardless of gear.

Mike

FASTLAP
Dirt Maniac

Total posts: 171
posted May 21, 2004 05:02 AM  
I used the toolbox and it seemed to be fairly accurate. Went from a 5.29 to a 5.43. Not quite a 200 rpm difference.

[This message has been edited by FASTLAP (edited May 21, 2004).]

bone30
Dirt Full Roller

Total posts: 32
posted May 22, 2004 04:48 AM  
we figure bout 100 rpm for every .10 click on the ratio

MOD75D
Dirt Freak

Total posts: 236
posted May 22, 2004 09:35 AM  
I agree with nolimit92. We ran a 5.43 and was turning 7600 went to a 5.83 because 5.43 were bad and all I gained was traction. I still turn 7600 but the tires are seeing a lot less ware.

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