viper gearing


I think it would be too low. It will throw your clutching way off, you will be overreving. And you will lose a lot of top end speed. I'm guessing that your top end would only be about 75mph. I used those gears with 8 tooth drivers in the mountains in my srx. When I came back home I put in my flatland clutch wieghts, 8dn-20's with 4.5 and 5.5 rivets and left those gears in. I was overreving so I put in 23/39 gears and it brought my rpms down to where they should be.
 
the thing is, is i want to make the front end of my sled stand up easy so i thought gearing, clutching, the drivers, and a track with bigger lugs would do the trick. what do you think would make a viper stand up on end with those mods? oh and i also have a rumble pack exhaust on it.
 
To make your front end lift the main thing you would want to do is work on getting more wieght transfer in your back suspension. Do a search and you will find information about what to change in your rear suspension to help you do this. You could maybe gear down your top gear I tooth and put in a different primary spring to raise your engagement rpm also. But nothing you do will help if you don't get wieght transfer and all you do is just sit and spin instead of take off.
 
alright. im getting an 04 ski doo rev suspension so were gonna see how that goes together. how do you think this would work?
 
depends on how you set up your suspension. any suspension is better than the stock one in a viper and you should be happy with ride quality. If you want to pick the skis up, you need to adjust the limiter straps.
 
21/40 gearing = 97mph real speed, 110.5 mph speedo readout at 1 to 1 clutch shiftout, standard 9 tooth drivers, no over-rev. I agree, clutching and suspension setup would do more good. Revs will rise with lower gearing as stated above.
 
BornYamaha said:
21/40 gearing = 97mph real speed, 110.5 mph speedo readout at 1 to 1 clutch shiftout, standard 9 tooth drivers, no over-rev. I agree, clutching and suspension setup would do more good. Revs will rise with lower gearing as stated above.
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Ok, I am probably wrong about my guess at top speed.... I didn't think you would ever get 97mph out of those gears. I know I wouldn't be able to with my 8 inch drivers and 2" track.
 
ok ok lol. so it would be a good idea for the gears 21/40 on my sled along with clutching and the suspension with the 8 tooth anti slip driver make it stand up?
 
IMO:
21/40 with 8 tooth drivers works out to 2.14:1 gear ratio that would give you a top end of @85mph [at 8500 rpm at a 1:1 shift ratio]. IMO this is WAY too "low" of gearing for a "Flat Land" Viper.
Remember switching from 9 thooth drivers to 8 tooth effectively "Lowers" your gearing by 12.5%.
For a stock flat land Viper the "lowest" final gear ratio I would be suggest is @ 1.90:1[I actually like 1.80 -1.85:1] for a fair compromise:
-23/39 with 8 tooth drivers works out to: 1.91:1
-21/40 with 9 tooth drivers works out to: 1.90:1
Lifting the skiis real high is only good about the SHOW + more about suspension setup and traction then it is about gearing. Lifting the skiis slightly[under 6"] is all about the GO!
JM.02c
 
BRAAAPPP420 said:
Revs will rise with lower gearing as stated above.

what do you mean by this?
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Anytime you change the gearing youll change the rpm in which the engine will operate in because the gearing determines the load applied to the engine. Going to a steeper gear ratio reduces the load on the engine and and will allow the engine to pull more clutch weight, so if you dont change the clutch weight,the engines operating rpm will be higher. If you go higher on the gear ratio, the engine would pull less clutch weight if everything else remains the same.

"steeper"/"lower" gear ratios are numericly higher.

"taller" gear ratios are numericly lower

Your stock gear ratio is 22/38, youd simply divide the top sprocket into the bottom,which equals-1.727:1, meaning the top jackshaft which your secondary clutch is joined to turns 1.73 times to 1 turn of the driveshaft,which your track is joined to, so it multiplys the engines output.
Again,the higher this number,the less load is applied to the engine .
 
all i want to do is ditch bang with a gnarly sled. im 15 and know very little but i stripped my sled down to the chassis cleaned her up and now just sitting in the garage waiting for new parts to thrown on.
 
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