Badapwned Posted November 25, 2008 Report Posted November 25, 2008 I was searching the forum to find some topics about gearing.... I came across this nifty calculator... http://home.earthlink.net/~gellett/banshee.htm Is this thing accurate? From my gearing and my tire size, etc. It seams pretty inline with a GPS I used to track top speed. My real question, if i gear it down from 72 MPH to 61 MPH, think I will notice anything on the bottom end? I have no reason to go 72 MPH, 60 is more then enough for trails, tracks and dunes right? So I can take the top speed down and get more bottom acceleration.....right? Quote
AKheathen Posted November 25, 2008 Report Posted November 25, 2008 I was searching the forum to find some topics about gearing.... I came across this nifty calculator... http://home.earthlink.net/~gellett/banshee.htm Is this thing accurate? From my gearing and my tire size, etc. It seams pretty inline with a GPS I used to track top speed. My real question, if i gear it down from 72 MPH to 61 MPH, think I will notice anything on the bottom end? I have no reason to go 72 MPH, 60 is more then enough for trails, tracks and dunes right? So I can take the top speed down and get more bottom acceleration.....right? yes, but the gears will be a tad shorter, but mabey not noticably Quote
Snopczynski Posted November 25, 2008 Report Posted November 25, 2008 yes, but the gears will be a tad shorter, but mabey not noticably Its at least 6mph off in 6th gear from my bike (radar, gps) by my accounts of how big my rear tires would be on a wot run. Quote
Badapwned Posted November 25, 2008 Author Report Posted November 25, 2008 Its at least 6mph off in 6th gear from my bike (radar, gps) by my accounts of how big my rear tires would be on a wot run. 6 MPH off which way? It shows your top speed to high or to low? Quote
Snopczynski Posted November 25, 2008 Report Posted November 25, 2008 It says my top speed is lower than it really is as tested. Quote
Badapwned Posted November 25, 2008 Author Report Posted November 25, 2008 It says my top speed is lower than it really is as tested. Think I should take that into consideration when buying new sprockets? Im assuming right now I have stock sprockets. I pretty much toped out at 72 MPH in deep soft dirt. So, If I use the calculator, its pretty accurate to what I have. Should I just assume its perfectly right and buy sprockets to what it says? lol I want to achieve around 60 MPH max speed. So, I could use 13 front and 45 rear, and get roughly 62 MPH with a 20" tire. Or from anyone's experience is this to much or to little gearing? Quote
pittss1c Posted November 25, 2008 Report Posted November 25, 2008 Is the calculator off, or are your tires a different size at top speed? Quote
Badapwned Posted November 25, 2008 Author Report Posted November 25, 2008 Is the calculator off, or are your tires a different size at top speed? Damn, thats a good point. I know this question isnt referring to me, but...damn lol 1 Quote
dajogejr Posted November 25, 2008 Report Posted November 25, 2008 Damn, thats a good point. I know this question isnt referring to me, but...damn lol Tires, especially low pressure tires like we run, tend to grow at higher speeds... If you lower the gearing, it won't change the motor at all, rather you'll go through gears faster and have to shift more often... For trails, a bump in compression and timing helps bottom to mid... Quote
Badapwned Posted November 25, 2008 Author Report Posted November 25, 2008 Damn, thats a good point. I know this question isnt referring to me, but...damn lol Whats the max RPM on a banshee? Is it around 9,000? Quote
dajogejr Posted November 25, 2008 Report Posted November 25, 2008 That depends on several factors. Carbs, intakes, porting, exhaust pipe, ignition...just to name a few. Quote
Badapwned Posted November 25, 2008 Author Report Posted November 25, 2008 Well, the only reason to gear it down is that i have no place to go 70 + MPH. Its wasted gearing for me. 60 MPH is more then enough. Might as well get more acceleration right? Quote
Badapwned Posted November 25, 2008 Author Report Posted November 25, 2008 (edited) Well, stock carbs, 380 mains, cyl have been ported (not real aggressive, but has had some porting), FMF pipes, +4 timing, pod filters. I would assume the max rpm on the shee is not much more then a stock one. Considering the minor engine work..... Edited November 25, 2008 by Badapwned Quote
dajogejr Posted November 25, 2008 Report Posted November 25, 2008 380 mains on those mods? I'd love to see your plug chop...that's huge. With your setup...I'd say 9500 to 10K, give or take. I'd setup the bike to have a linear power spread, shortening up the gearing won't do that...as much as you're looking to. Or just stay in the lower 4 gears. Quote
Badapwned Posted November 25, 2008 Author Report Posted November 25, 2008 380 mains on those mods? I'd love to see your plug chop...that's huge. With your setup...I'd say 9500 to 10K, give or take. I'd setup the bike to have a linear power spread, shortening up the gearing won't do that...as much as you're looking to. Or just stay in the lower 4 gears. So your saying, gearing it down to 60 MPH from 70 MPH wont do anything for me? Everyone keeps telling me 380 is huge, but I could get zero plug color with anything smaller then that. The last plug check i did was with 360's and the plugs had no color. If anything the plugs looked lean. They were starting to get that slightly white look, like a lean condition. Once I put the 380's in I finally got a brown color on my plugs. Bike runs great with the 380's in. It never bogs or spits or anything at WOT. Runs great throughout the RPM range. It takes the gas and grins back at me lol Quote
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