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Old 28th June 2018
MatHormell's Avatar
MatHormell MatHormell is offline
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Default Any 88/90inch using 30T crank sprocket?

Considering going to a 30T crank sprocket on my 90", curious is anyone else is using one on a 88/90 and what final drive sprockets are you finding to work best with it?
I am currently running 19Tf 45Tr and would like to get into 5th a little bit sooner and would prefer to cut weight than add it with more chain and sprocket.
Also reason I mention 88/90", I was told once it wouldn't be as beneficial on a 90" because I would loose out on the TQ, so curious how its working for you.
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Old 28th June 2018
mac93 mac93 is offline
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IMO, gearing is whatever the dyno sheet says it should be, the 30t makes a bigger difference on the smaller engine, you need more clutch spring rate on both, I’ve run 30t on a 76 in. and 90in. They both liked it. Don’t think I’d like to hand clutch the spring rate needed in the 90. I’m guessing it would be harder to get a consistent 60, Never did it so don’t know for sure. Sometimes I wonder what would happen if I went the other way on the bigger engine, but then you speed up the transmission and I’m not sure if that’s a good thing. I’m running 360#’s static now and it’s killing my hand by the end of the day. Not sure what you mean by lose out on the torque?
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Old 28th June 2018
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MatHormell MatHormell is offline
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Quote:
Originally Posted by mac93 View Post
IMO, gearing is whatever the dyno sheet says it should be, the 30t makes a bigger difference on the smaller engine, you need more clutch spring rate on both, I’ve run 30t on a 76 in. and 90in. They both liked it. Don’t think I’d like to hand clutch the spring rate needed in the 90. I’m guessing it would be harder to get a consistent 60, Never did it so don’t know for sure. Sometimes I wonder what would happen if I went the other way on the bigger engine, but then you speed up the transmission and I’m not sure if that’s a good thing. I’m running 360#’s static now and it’s killing my hand by the end of the day. Not sure what you mean by lose out on the torque?
I run the barnett with the 6 gold springs, its stiff for sure but with the CRF perch and its throw Its not as bad as with a stock perch. What do you mean by what ever the dyno says? As far as missing out on torque, I don't recall exactly what was said but it was something to do with the motor turning up quicker, I think he was under the assumption I do not rev as high as the 1250/75's which I could see his point but I'm turning 7500 right now and bumping up to 8k for the next round.

I do prefer a hand actuated clutch, probably isn't nearly as consistent, maybe one day I'll come around to the variables lol.

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Old 28th June 2018
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The dyno sheet shows where the power is, shift/gear to spend as much time at as much horsepower you can. Need consistent 60’s for bracket racing, within .02 for the day, I’m sure my tune up is different from heads up racers, just my take on what works for us.
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