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Old 06-30-2009, 05:37 AM   #6 (permalink)
minibajaman

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Default Re: Reliable FNR gearbox for SAE app?

Quote:
Originally Posted by atomicjoe23 View Post
Just checked it out. . .a little pricey and I'm guessing no differential action since it doesn't say anything about it. . .like the fact that it's set-up for VW CV's, but the gear ratio seems pretty high to me as well. . .seems like most people on the forum have said that they are very happy with ~4.85:1. . .the Stak is about double that. . .maybe a good thing for a little SAE B&S engine. . .that's not my area of expertise though. . .
No need for a diff on off-road race cars. The gear ratio is probably pretty close to what you need; most Baja cars are running anywhere from 7:1 to 10:1 with a CVT. 4.85:1 is only for bike powered mini buggies and is in no way comparable to a Baja SAE car. You can do the calculations pretty easy to figure out what gearing you need for a top speed of say 35 mph. Or look around on here, I posted a spreadsheet that does the gearing calcs for you several times before.
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