Burandt clutch/Kurt gear down kit
- Thread starter Colin101
- Start date
Ok... math the Kurts gearing vs pro pulleys on 7 tooth 2.86 drivers (the most common Axys setup) for us. I guess I was under the impression that they were more or less the same. If not maybe a Kurts kit is worth looking into.
stock final=2.21
kurts and pro gearing is basically the exact same..2.37 vs 2.39..
tki 28/63=2.55
26/63=2.75
sounds like just gearing down and using stock setup still works really good?
kurts and pro gearing is basically the exact same..2.37 vs 2.39..
tki 28/63=2.55
26/63=2.75
sounds like just gearing down and using stock setup still works really good?
S
Spaarky
Well-known member
Nick... show your math. I have ran it through the MPH calculator and did the math long hand. Both show me that the Pro gears give you a lower final ratio.
Yea, show the man Nick. Heehee just kiddin ya both. This is a good subject.
Maybe it's best just to keep it apples to apples with gear ratios only? Leave the drivers out of it, since that's an additional change.
- Pro is 44/21 = 2.095
- Axys is 43/22 = 1.95
- TKI is 63/25 thru 63/30 = 2.52 thru 2.1 (interesting the "recommended" ratios are close to Pro ratios)
- Kurt's ?
67/32=2.35
69/29=2.67...nice
69/29=2.67...nice
So gearing only, not final drive:
- Pro is 44/21 = 2.095
- Axys is 43/22 = 1.95
- TKI is 63/25 thru 63/30 = 2.52 thru 2.1 (interesting the "recommended" ratios are close to Pro ratios)
- Kurt's is 69/29 and 67/32 = 2.38 and 2.094
Perfect Axys/pro mountain gearing is 3.2-3.3 final drive ratio in my opinion. 163” 3” track. Don’t doubt, just do it and put turbos out of business. Or wait till Burandt claims he invented it and hop on board. Whatever way, it’s all good.
W
Winter Nutz
Well-known member
If I was to put the Pro gears on my 850, can I still run my new/stock 850 belt? or are the pro and axy belts different? and will the pulley's go right onto the axys shafts?
be good to know all of this before I start looking for a parted out pro
be good to know all of this before I start looking for a parted out pro
800 and 850 axys sleds have the same gears/belts on the quickdrive so the pro pulleys work the same on an 850.
Great setup, cheap upgrade with very good gains.
Great setup, cheap upgrade with very good gains.
I can believe it, how much track speed do you really need in the trees? Just like gearing a dirt bike way down for extremely technical riding. But how do you even achieve those final drive ratios? Whats the on trail top speed?
Yes, exactly like gearing down a dirt bike for extreme technical riding.
The crazy low drive ratios are achieved by using a belt drive setup with different custom gears from a non sled manufacturer. Unfortunately, none of the belt drive companies go larger than 66-69 tooth. The chaincase has to be modified to fit the larger bottom gear. It’s a bit of work but when you hit the combo, it’s crazy.
I think my top trail speed is like 55-60mph. I can’t remember as I’ve only hit it once going downhill on a long flat stretch.
The secret is to use low gears to hit 1-1 clutch ratio, into overdrive and then overrev when clutches are locked out for even more mph.
When geared perfectly, the clutches should shift seamlessly all the way to the rev limiter.
I like to share info so fellow sledheads can have the info in their back pockets for future knowledge.
I am at 3.65gr with a 174” 3” track. Bone stock engine. It nibbles on the heels of turbos and beats the poorly tuned ones no problem. Some days I can’t believe what it does and I shake my head in disbelief.
If the difference was only 3-4 sled lengths it wouldn’t be a big deal. But a low gearing combo beats other sleds by a long shot. It’s not even in the same ballpark. It’s that crazy. Not bragging, just painting a picture so hopefully some ambitious person will do it too. Cheers!
I will certainly take it into consideration when gearing down my sled. I dont have such a long track, and I would like a bit more trail speed (comfortably be able to cruise at 60), so I probably wont go to such a extreme. But its definitely something to digest and am considering going beyond what most people do. Thanks for the reply.
I talked to kurts today. They said only option for the axys is the 67/32. Im running pro pulleys already so makes no sense to do the 67/32. Maybe I asked the wrong questions there. Someone posted back that there was a 68/29 option.
Its in development. Not ready for public consumption just yet. But basically a slightly more affordable alternative then buying new pro pulleys.
They still prefer the full gear down kit they have been producing as the belt is softer and rolls more freely vs the Polaris factory belt. But at about 50% of the cost on the new kits, your still going to be seeing most all of the performance gains.
