gear down kit question for 7 tooth drivers

[mountainhorse]

Loading the clutches also has a lot to do with helix/spring weights/spring.

What RPM does the cat make power at (what is the "target" clutching RPM?)





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[WyoBoy1000]

Would have to dig up the math, but it was an actual circumference measurement, calculated out. (On the drivers).
Have to measure clutch, is it the same on the pro and axys

Your saying the chain case 3" axys has the same 22/43 gears?

I target 8000+ prefer 8150rpm they say 7950 is target but on hill performance is 81-8200.

Team primary running very similar primary spring with 66g haven't been in the sec yet.

 

[WyoBoy1000]

Would have to dig up the math, but it was an actual circumference measurement, calculated out. (On the drivers).
Have to measure clutch, is it the same on the pro and axys

Your saying the chain case 3" axys has the same 22/43 gears?

I target 8000+ prefer 8150rpm they say 7950 is target but on hill performance is 81-8200.

Team primary running very similar primary spring with 66g haven't been in the sec yet.

If those gears are the same it would calculate in comparison to cat math to a 2.13 ratio vs cats 2.86. That would be a ridiculous difference. So im curious to figure this out.

Mnthrs, what do you recommend for gears on 2.6 or 3"

Side note, that 156 with pro skid actually puts on the ground over 3" more track from smaller wheels and longer rails. That's impressive as the 16 cat is better but the 15 losses 5" compared to the axys. I was planning on putting a pc on the axys but I will have to modify the rails to fit it.

 

[mountainhorse]

From post #14 above... ALL factory equipped AXYS-Mtn chassis with 3" paddle tracks have 19/44 gearing

Gearing on all the sleds all sleds run the same straight cut 40 ER helix

Assault/SKS 155" with 2.6" track = 20/40/72p

All 3"-Lug, 155" & 163" (actually 156" & 162") Equipped sleds = 19/44/74p

Quickdrive™ sleds all have 22/43 gearing

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[WyoBoy1000]

Wasn't sure, what does the 74p stand for.

Based on the 19/44 = 2.315. Then if calculated the same way I do with the cat x.09 reduction that gearing adds up to about 2.399 or just say 2.40. Where the 16 cat is a stupid 2.86. My 14 is 2.42 and pulls a lot harder then the 16. The 16 just revs it feels like. 2.4 is great imo, but I'm getting measurements on the clutches to see if there is a difference.

So to me I don't see any reason to change gears yet.

 

[mountainhorse]

74p = 74-pitch chain... indicates the length of the chain needed to install that gear combo.





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[mountainhorse]

19/44 is 2.32:1 (rounding)...

If you are looking for a comparative "Polaris Ratio" as most on this AXYS-forum are... the math would be 2.32 ÷ .92 = 2.52:1

A "comparative" ratio is just a way for people that are used to 8tooth, 2.86"-pitch drivers to understand a "relative" ratio compared to what they have become used to with the PRO-RIDE-RMK's and 2007(+) IQ-RMK's.

Also will be useful for people to know that a change from the 7 tooth 2.86" pitch drivers to the 7 tooth 3" pitch drivers will have an effect as well.

With the Polaris sleds... we are not considering stock 8tooth drivers with 3" pitch (which is on your Cats)... for that comparison... hence the .92 compared to the .90 (9%) comparison.

Also, with all the variables and differences in the two brands of chassis/engines/clutches/driveline design (Cat/Polaris)... I don't think that trying to find a calculable "common ground" will bear much fruit.




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[mountainhorse]

And... to add to this... The actual diameter of the clutch(s) has a bearing... but thats no the full story.

The functional diameters... or where the belt rides on both clutches when the sled is operating is what truly matters in terms of a diameter measurement.

The choice of weights (shape of the cam and actual weight), the spring and the installed height (on both clutches), the helix and it's shape, the belt/shieve angle etc etc all bear weight on the comparison.

For these reasons, IMO, trying to find the common ground isn't super relevant.




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[WyoBoy1000]

Yep I understand that, I'm going off of the same method I use for gearing in the cat, so I have to calculate using that method.
What I call 2.42 in the cat is a 26/63 belt drive with 8 tooth (3 pitch), which is what I run and works better than anything else I found. Now if you go to a 7 tooth 3p, you times the number by .09 then take that number and add it to the 2.42. For instance 2.42x.09=.2178. .2178+2.42=2.6378. So 8t is a 2.42 and with same gears and 7t is 2.63.
Now the 2.63 is to low. So im trying to figure out what is close to the same method so I can get close to the same ratio that is in the cat but now in an axys. So I use the gears and calculate to get 2.315 then add the reduction for 7t and get 2.40 or close to it. Meaning from what I can tell so far the axys already has what im looking for.

Now I just need to look at the clutches to see if there is a difference, but using my math, I want to be around 2.4 to 2.5 max.

Thanks for the info and I hope I didn't screw anyone up with my crazy math, lol