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Discussion Starter · #4 ·
I have never checked a sled by GPS, but I was hoping it would be closer to the "real" speed being traveled, I really don't care one way or the other, just was more concerned about the ECU seeing everything clearly if you know what i mean!
 

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I believe it's the other way around. Gearing taller slows the speedo and odometer down. But, if speedo is 5-10% fast already as most are, it should make it more accurate. 1.73/1.8 = .9611 or about 4% slower.
I gear mine up and they read low speed and log less miles. Jackshaft spins same rpm and sled goes faster than ecu thinks it is.
 

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So I believe larger number gear ration (such as 2.0) is a larger gear with more teeth on the drive shaft, and smaller gear with fewer teeth on the jack shaft. This means that it takes more turns of the jack shaft to effect a single turn of the drive shaft. (Note the gear ratios for 1.3" tracks, vs 2" tracks on crossover sleds) So more torque and lower top speed with higher numbered gear ratio. This means, that if you swap out the gear ratio for a higher number... the sled will be going slower than the original gear ratio at any given RPM for the jack shaft.

But I could be thinking incorrectly.

Mike
 

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So I believe larger number gear ration (such as 2.0) is a larger gear with more teeth on the drive shaft, and smaller gear with fewer teeth on the jack shaft. This means that it takes more turns of the jack shaft to effect a single turn of the drive shaft. (Note the gear ratios for 1.3" tracks, vs 2" tracks on crossover sleds) So more torque and lower top speed with higher numbered gear ratio. This means, that if you swap out the gear ratio for a higher number... the sled will be going slower than the original gear ratio at any given RPM for the jack shaft.

But I could be thinking incorrectly.

Mike
That is correct and is why you will log more miles than actually traveled.
 

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Went from the stock 1.86 gear to 1.74 and no reflash.
Went on a 130ish mile ride with 2 other sleds. They were both within 0.3-0.4 miles of each other.(18 XCR 800 and 18 Sidewinder)
My sled(20 XC850) was around 10-11 miles less on the odometer than theirs, on the same exact trip. Sensor for the speedo is on the jackshaft, jackshaft turns less revolutions with new gear(1.74) compared to stock(1.86). My speedo read lower mph than before and odometer recorded less miles. But is probably more accurate to the actual mph and miles traveled, than it would be with the stock gear.
 

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Went from the stock 1.86 gear to 1.74 and no reflash.
Went on a 130ish mile ride with 2 other sleds. They were both within 0.3-0.4 miles of each other.(18 XCR 800 and 18 Sidewinder)
My sled(20 XC850) was around 10-11 miles less on the odometer than theirs, on the same exact trip. Sensor for the speedo is on the jackshaft, jackshaft turns less revolutions with new gear(1.74) compared to stock(1.86). My speedo read lower mph than before and odometer recorded less miles. But is probably more accurate to the actual mph and miles traveled, than it would be with the stock gear.
And, the best part is that the CVT automatically adjusts to the difference and delivers almost the same mpg.
A taller gear adds load to the CVT and it compensates by gearing down so engine runs at about the same rpm for any given speed vs the lower chaincase gearing.
 

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MY21 650 SBA 146, ES, ICE Storm 1.5
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Is there any issues with NOT getting a speedo recalibration reflash for a gear change on a 2022 XCR 650 128"? Went to 1.73 from 1.80
Going to 1.73 from 1.80, would have the sled moving faster, covering more miles, than the speedometer/odometer shows.

About 4% more MPH or miles traveled, than previously indicated by the gauge.
 

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MY21 650 SBA 146, ES, ICE Storm 1.5
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Just a heads up--Polaris updated the digital wrench, and currently you Cannot recalibrate the speedo, on the 22's. I hear their working on it.
Pretty embarrassing for Polaris, don't you think, Jim.
 
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Polaris is really fucking this shut up. how in the hell are they allowed to sell something with no support? nope we can't flash 22's ecu's, pbr's etc. WTF they are starting to really piss me off. guys leaving Polaris again like it's 2008 all over again. a lot of the Polaris guys are buying ski-doo this year. good job. there losing the atv/utv market as well.
 

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MY21 650 SBA 146, ES, ICE Storm 1.5
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Polaris is really fucking this shut up. how in the hell are they allowed to sell something with no support? nope we can't flash 22's ecu's, pbr's etc. WTF they are starting to really piss me off. guys leaving Polaris again like it's 2008 all over again. a lot of the Polaris guys are buying ski-doo this year. good job. there losing the atv/utv market as well.
I just verified that the most recent update to Digital Wrench II version 4.3 was issued Feb. 8, 2022.

As I have posted before, Polaris still has NOT officially released ECU software for reflash or initialize of new electronics for MY22 snowmobiles equipped with 650 and 850 Patriot engines. The good dealers are being put in a terrible situation without support from Polaris. I am getting myself into trouble for making this post, I'm sure.
 

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I directly encountered this yesterday. Dealer tech and I were scratching our heads, he called Polaris and the message we got back is, D Wrench 2 software current release is indeed in deployment without several features operable. One of the inoperable features is the ability to change gear ratio on '22 sleds. Polaris' message to the dealer tech is that it is scheduled to be updated but they couldn't tell him when. Super awesome.
 
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