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Polaris: TURBO Turbo discussion for Polaris aftermarket turbo sleds
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Old 01-27-2019, 09:22 PM
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Default Track tension

How tight are you guys with 163 turbos tracks? PRO RMK. I stripped cogs on belt last year due to extremely loose track. 10 lbs on track and 3/8-7/16 gap. This year snapped belt with couple cogs showing some signs of wear. Right before belt snapped I felt a pretty good ratchet. Not sure if it was the two sharp/pointy stumps I revealed or if I need to tighten track a tad more.

Belts are getting expensive!

FYI “tight” doesn’t provide me much help!

Last edited by sledhead_79; 01-27-2019 at 10:02 PM.
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Old 01-27-2019, 09:58 PM
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I ride a reg old pro, sled has the AVID drivers which drive through window and the nubs on the track. I run a 174x2.5 track, I don't run it too tight and never had it ratchet, I've just felt how much flex/sag I have from my top 2 wheels to the rear wheels on the suspension, It's not much help i'm sure but Its not super loose but yet not tight like a string, Could try and measure it later there to get a better number, but To me you kinda know when its too tight and at that, when its too loose. It's how I've done all my sleds, never had an issue yet, Overly tight can be tough on everything down there as well

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Old 01-27-2019, 10:01 PM
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Originally Posted by Octanee View Post
I ride a reg old pro, sled has the AVID drivers which drive through window and the nubs on the track. I run a 174x2.5 track, I don't run it too tight and never had it ratchet, I've just felt how much flex/sag I have from my top 2 wheels to the rear wheels on the suspension, It's not much help i'm sure but Its not super loose but yet not tight like a string, Could try and measure it later there to get a better number, but To me you kinda know when its too tight and at that, when its too loose. It's how I've done all my sleds, never had an issue yet, Overly tight can be tough on everything down there as well
Im also in an PRO. I bet you are looser due to Avids.
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Old 01-28-2019, 09:45 AM
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I always run it 5/8-3/4 inch. Thats the exact #s from the manual. I haven't had one issue with it in that spec range. Im on 7lbs axys 163
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Old 01-28-2019, 12:04 PM
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IMO the stock drivers are junk. I always R&R my drivers with Avids (not the center drive version) on my sleds. One of the guys in our group runs a Mtn Tek turbo on his 18 163. Thing was ratcheting frequently under load. Ditched the stock drivers, installed Avids and hasn't had it ratchet since.

I've had Avids on since day one, first season with a stage 3 kitted 800 with the 2.6 track and 2 seasons with a BMP 860 running a 3.2" track and never had it ratchet. This season I've boosted my spare 800 with a '19 BD Sidekick Switch and some BMP turbo parts and not had any problems.

These are the non-center drive Avid drivers I'm referring to. They will require you to trim the rails and run an snti-stab kit. I run a Kmod skid so no trimming was needed, stock skid has never seen a flake of snow. This drive shaft has the Avid 8T 2.86 drivers. When I switched to the 3.2, I bought a new steel drive shaft to install the 7T 3" pitch drivers.

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Old 01-28-2019, 12:18 PM
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Originally Posted by sledhead_79 View Post
Im also in an PRO. I bet you are looser due to Avids.

You will want to find a set of the avid's, IIRC, the stock ones will wear down quickly from the power, and of course ratchet badly. They can only hold so well and work OK stock but when you add the power.... It just doesn't work, the track nubs flex and the drivers probably start to round off a bit. I'm unsure of why the factory doesn't just drive through the windows as they are already clipped and there....

Last edited by Octanee; 01-28-2019 at 12:25 PM.
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Old 01-28-2019, 12:30 PM
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Originally Posted by sledhead_79 View Post
Im also in an PRO. I bet you are looser due to Avids.

I have Avids and I'm very close to Poo track tension specs. The track needs to be close to those specs to function properly.
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Old 01-28-2019, 05:11 PM
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174 here, exact set to the manual, 10 psi, zero issues with stock drivers.
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Old 01-28-2019, 10:53 PM
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Quote:
Originally Posted by richracer1 View Post
IMO the stock drivers are junk. I always R&R my drivers with Avids (not the center drive version) on my sleds. One of the guys in our group runs a Mtn Tek turbo on his 18 163. Thing was ratcheting frequently under load. Ditched the stock drivers, installed Avids and hasn't had it ratchet since.

I've had Avids on since day one, first season with a stage 3 kitted 800 with the 2.6 track and 2 seasons with a BMP 860 running a 3.2" track and never had it ratchet. This season I've boosted my spare 800 with a '19 BD Sidekick Switch and some BMP turbo parts and not had any problems.

These are the non-center drive Avid drivers I'm referring to. They will require you to trim the rails and run an snti-stab kit. I run a Kmod skid so no trimming was needed, stock skid has never seen a flake of snow. This drive shaft has the Avid 8T 2.86 drivers. When I switched to the 3.2, I bought a new steel drive shaft to install the 7T 3" pitch drivers.

Agree with all the comments from richracer1,
In addition take the stock clamp off the mag side and put it on the PTO side and run a happy face collar clamp on the mag side.. It's tougher than the OEM one. ( I have an extra one avaiable on the shelf)

Track Tension;
I always run, (even with the avids) 1/2" of sag now to get the best out of performance. Robbie @ avid told me to try it-and it works very well .This is with ZERO weight pushing down on the track just a free hang while supporting the rear of the sled on a stand.
I run a 162 Power Claw 3" on my K-Mod 163 skid and have ZERO issues with the Hex drive shaft under 10# boost,and have lots of adjustment for track tension.

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Last edited by Sage Crusher; 01-28-2019 at 10:55 PM.
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Old 01-29-2019, 10:48 AM
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Old 01-29-2019, 11:51 AM
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