ski
New member
I made up a little excel sheet with a gear chart for 8 and 9 tooth drivers and a speed calculator.... It is in Microsoft Excel format so you need that program to use it. Let me know if it works ok and if I should make any changes to it. Thanks -Steve
Click here to try it
Click here to try it
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BLUE LIGHTNING
New member
good job works really well ,
I just put 8 tooths drivers on this year and hopefully i can reach the "max speed"
MAYBE U COULD GET THIS POSTED IN THE TECH AREA!
CHEERS
JP
I just put 8 tooths drivers on this year and hopefully i can reach the "max speed"
MAYBE U COULD GET THIS POSTED IN THE TECH AREA!
CHEERS
JP
yamyrider
Active member
this is where I get really lost.
Acording to this I should hit 110.45 miles an hour with my SXR.
I am trying to understand how this works when there is nothing showing horse power or torque.
Can someone explain how the calculation works. Thanks.
Acording to this I should hit 110.45 miles an hour with my SXR.
I am trying to understand how this works when there is nothing showing horse power or torque.
Can someone explain how the calculation works. Thanks.
ski
New member
According to gear ratio, that is the maximum speed achievable within the given variables... now whether or not you have the horsepower to push that kind of speed is a different story...
For example at a 1:1 clutch ratio my Vmax 500 is geared from factory to go around 95mph. Now, my Vmax will go 95 mph only if thrown from a plane at high altitude.... 85mph is more reasonable for the power I have. so by putting more gear into the sled I can get better acceleration while not losing any top end speed, in fact if the clutches work properly I can gain both top end and acceleration by letting the engine do less work with the Steeper gears. This is a give and take process that you can only succede at through experience or trial and error.
Rider weight plays a large role in choosing the appropriate ratio.
one way to check this is to get a GPS or radar top speed for your sled , lets say it goes 96 MPH, and the gear calculator says max is 107MPH. Then you should gear for a max speed of about 98 MPH, not lose any top end but get there faster... Make sense?
If not don't worry, I am still just figuring this out as well.
For example at a 1:1 clutch ratio my Vmax 500 is geared from factory to go around 95mph. Now, my Vmax will go 95 mph only if thrown from a plane at high altitude.... 85mph is more reasonable for the power I have. so by putting more gear into the sled I can get better acceleration while not losing any top end speed, in fact if the clutches work properly I can gain both top end and acceleration by letting the engine do less work with the Steeper gears. This is a give and take process that you can only succede at through experience or trial and error.
Rider weight plays a large role in choosing the appropriate ratio.
one way to check this is to get a GPS or radar top speed for your sled , lets say it goes 96 MPH, and the gear calculator says max is 107MPH. Then you should gear for a max speed of about 98 MPH, not lose any top end but get there faster... Make sense?
If not don't worry, I am still just figuring this out as well.
ski
New member
What gears and drivers do you have in your SXR? Also, what is the max RPM?
yamyrider
Active member
22/39 gears with the 9 drives. With the pipes I am 9100 RPM max.
My weight is 180. Based on this I think the stock gearing is ok.
am i right.
My weight is 180. Based on this I think the stock gearing is ok.
am i right.
aSRX600guy
New member
nice job!
a good tool for deciding what gears to use.
find your top speed with stock gearing, then gear down to that top speed, and you'll get there faster.
now if only there was a speedometer to real speed conversion table
a good tool for deciding what gears to use.
find your top speed with stock gearing, then gear down to that top speed, and you'll get there faster.
now if only there was a speedometer to real speed conversion table
yamyrider
Active member
SO if you go up in gear size you will get more top speed but get there slower.
If you go smaller gears you lose top end but will get there quicker.
What is the difference in dropping one tooth on the top or the bottom.
Is it better to drop the bottom gear or top.
According to the spread sheet if I drop one tooth on the bottom gear I will gain top end and my gear ratio is smaller but what does that do for acceleration.
If you go smaller gears you lose top end but will get there quicker.
What is the difference in dropping one tooth on the top or the bottom.
Is it better to drop the bottom gear or top.
According to the spread sheet if I drop one tooth on the bottom gear I will gain top end and my gear ratio is smaller but what does that do for acceleration.
yamyrider
Active member
there is a big top end difference when I go up one on top and down one on the bottom which gives 23/38 but I guess you need to power to pull that as well...am I correct.
I have a SXR700 with Aaen triples, reed spacers and 1 layer removed from head gasket. I am thinking this should put me about 135HP.
Should I leave gearing stock??? Thanks for the info.
I have a SXR700 with Aaen triples, reed spacers and 1 layer removed from head gasket. I am thinking this should put me about 135HP.
Should I leave gearing stock??? Thanks for the info.
2001_blue_sxr
New member
- Joined
- Oct 20, 2005
- Messages
- 189
- Age
- 40
- Location
- New Liskeard, Ontario, Canada
- Website
- www.vanducchiracing.com
i'm startin to wonder about this now...i was told that to get more bottom end to go from the 22/39 to a 24/38 combo...according to the chart its givin me more top end?
yamaholic22
Active member
yamyrider, stock gearing will work great with those pipes. As for somebody telling the other guy that 24/38 will increase your bottom end, they are mistaken. Here is the rules:
1.Bigger top gear (going up on teeth on top) will give MORE top end, LESS bottom end. Going to a smaller gear will do the opposite, giving less top end but better bottom end
2. Bigger bottom gear will give MORE BOTTOM END, and less top end. Smaller bottom gear will give more top end
Now, it needs to be noted that as somebody already said, just throwing in a ratio for better top end will probably not get you more top end unless you have added power to pull the taller gearing. It is just like manual transmissions in most standard cars. In most cases the car will not reach redline in high gear because it doesn't have the power to overcome all of the resistance on the vehicle at speeds that high, such as the wind resistance mostly, as well as driveline friction, road friction, etc. But if you add power to the vehicle and leave the gears stock, it will pull more rpms on top end and might reach the redline, where it would be beneficial to go to a higher gear ratio (say from 2.1 to 1.9) in order to increase the top end.
*When people say "taller gears" they usually mean a setup with a lower NUMBER ratio, which will increase top end if you have the power to pull it. Like people will say 5th gear is TALLER than 4th gear.
Hope this helps clear up some confusion.
1.Bigger top gear (going up on teeth on top) will give MORE top end, LESS bottom end. Going to a smaller gear will do the opposite, giving less top end but better bottom end
2. Bigger bottom gear will give MORE BOTTOM END, and less top end. Smaller bottom gear will give more top end
Now, it needs to be noted that as somebody already said, just throwing in a ratio for better top end will probably not get you more top end unless you have added power to pull the taller gearing. It is just like manual transmissions in most standard cars. In most cases the car will not reach redline in high gear because it doesn't have the power to overcome all of the resistance on the vehicle at speeds that high, such as the wind resistance mostly, as well as driveline friction, road friction, etc. But if you add power to the vehicle and leave the gears stock, it will pull more rpms on top end and might reach the redline, where it would be beneficial to go to a higher gear ratio (say from 2.1 to 1.9) in order to increase the top end.
*When people say "taller gears" they usually mean a setup with a lower NUMBER ratio, which will increase top end if you have the power to pull it. Like people will say 5th gear is TALLER than 4th gear.
Hope this helps clear up some confusion.
ski
New member
Yammyrider, you are geared stock for 110MPH, I don't think your sled will actually achieve that speed now ... so putting in a gear for more top end will have an opposite effect. Gearing down however, will get you more bottom end and may actually give you an increase in top speed as well, because the clutches will be able to shift out further. So, I would reccomend droping 2 teeth total (maybe 22-41 so you can only replace 1 gear and use your existing chain) and this would gear the sled for around 105mph which should be achievable for you. Keeep in mind this is at 1:1 ratio... if clutched properly with some mods you may find it shifts into overdrive ratio in which case you may add 5% to that speed.... all the while gaining better acceleration. But as it stands with stock gears you are losing because with the power you have the clutches will NOT shift out to 1:1 ... that is where you loose. In other words the clutches will pick up the top end that the gears take away and often gain more than you had to start with.
yamyrider
Active member
Thanks guys for the detailed answers.
I think I am getting it.
I think I am getting it.
bluemonster1
LIFE MEMBER ONLY ONCE!!!
speed man..it's abeautiful thing.
My 2001 Sx600 has 1 gasket mod done,can mod done,Carbon Fibre Reeds installed along with reed spacers.I am re clutching to drop my rpm's down from 9000 to 8500.If i change to 1 tooth higher 21/39 ..ratio would be 1.86. My speed should come up to around 98.15 mph. My weight is 165 lbs. Is this realistic. Using stock 20/39 would give me 93.62 mph. When sled was new,co-worker whom I bought it from said he used to hit 96mph (160km/h). Can I gear it 21/38 to go 100.85 mph or would clutching have a hard time with it.What about 23/37 gears to go 113.39 mph. Is there an end to this.What do you think would work best.SKI what do you think.I will be able to get to Steinbach from my place much faster...lol
Bluemonster1
My 2001 Sx600 has 1 gasket mod done,can mod done,Carbon Fibre Reeds installed along with reed spacers.I am re clutching to drop my rpm's down from 9000 to 8500.If i change to 1 tooth higher 21/39 ..ratio would be 1.86. My speed should come up to around 98.15 mph. My weight is 165 lbs. Is this realistic. Using stock 20/39 would give me 93.62 mph. When sled was new,co-worker whom I bought it from said he used to hit 96mph (160km/h). Can I gear it 21/38 to go 100.85 mph or would clutching have a hard time with it.What about 23/37 gears to go 113.39 mph. Is there an end to this.What do you think would work best.SKI what do you think.I will be able to get to Steinbach from my place much faster...lol
Bluemonster1
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ski
New member
First thing to do is get an actual speed on your sled with gps and then use that info and a check of how far your clutched are shifting out to determine if you should gear up or down.