another track/bulkhead clearance question

[pura vida]

i guess this is mostly directed towards mountain horse since he has talked about it so much but figured i would look for everyone's opinion.

so the PC is going on the PRO this week but when i bought it from carl's i didn't specify 7 tooth drivers. with the 8 tooth drivers and the PC the clearance is TIGHT! I was/am concerned about this but then was wondering if we were making a bigger deal out of this than necessary b/c the majority of the snow is pushed between the paddles, not over the tips. so how much difference does an extra 1/2+ of clearance between the track and bulkhead really make?

of course the rubbing on the tunnel is a whole other issue. but talking with chris at carl's he says the sled was significantly faster in every condition it was tested with this setup over the stock track and drivers. and they definitely do not like combo drivers but chris admitted they had not tested the new style yet. the biggest reason was b/c they do not like to cut b/c of how the track acts when this is done.

i'm still concerned about the clearance but going to run it for now. thoughts? thanks

pv

 

[slash]

I like a min of 1in 2in is great your track acts like a big fan restrict it and it slows down, and sucks up HP , give it room it will RPM faster THIS IS BETTER..

 

[mountainhorse]

More clearance than you have is better...

If Carl's has not tested the new drivers... they should, night and day difference in how the track works with these drivers compared to what they tested years ago.

I CAN tell you this... if you are testing rotating resistance, on a stand... by pulling the track backwards OR by rottating the secondary by hand (on the stand)....

This is not at all the same as the sled on the snow, under load, with the weight of the sled and rider on it...

 

[pura vida]

More clearance than you have is better...

I CAN tell you this... if you are testing rotating resistance, on a stand... by pulling the track backwards OR by rottating the secondary by hand (on the stand)....

This is not at all the same as the sled on the snow, under load, with the weight of the sled and rider on it...

I understand this. not what i was thinking at all. this is where people thought running tracks loose with combo drivers was a good idea. i just wish there was a way to quantify the difference between the energy it takes to push snow through the tunnel with a 1/2" of clearance vs. 1", 1.5", 2", etc. again on a track stand it works as a big fan and the more clearance the better (to a point) but when you add snow to the equation i wonder how big of a difference there is. i could see that once you get to a certain point the larger clearance would cause what i would describe as turbulence, actually lessening the efficiency of your snow evacuation. everyone always says that track speed is really the only important number but i would think if you really got down to the science of it the truly important number would be the volume of snow you can more through the tunnel? kind of like a jet unit on a boat. although this doesn't take into account the volume of snow you are pushing behind you... idk, just thinking. and i'm not happy with the limited clearance, i would be happier with more. the new avids would be the way to go. just wish you didn't have to cut the rail tips to get them to clear. that leads to other issues. wonder how well they would work without the anti-slip part...?

pv

 

[mountainhorse]

The Polaris factory runs trimed rail tips and toothed drivers on all the IQR's now.

Cat runs Combo

Doo Runs combo

Yamaha does as well.

"that leads to other issues"

Sincere question... what issues are you concerned about?

 

[pura vida]

i guess i was mainly concerned about how the track comes off the drivers and onto the rails. but antistabs probably solve anything that might be of concern. i should have been more specific with my statement. i want to see slowed down footage of a high speed camera recording this area under varying conditions and loads. and while we are at it the same thing of involute, old avids, and new style avids. is that too much to ask...? i'm probably over concerned and way over thinking it. i'm sure you are right and the new combos w/ antistab is the way to go. that or the extended chaincase that fastrax (i think) has coming out. but then you get into suspension changing issues. i'll probably go with the new style avids eventually, i just wish i wouldn't have paid $188 for the involute 8 tooth i have sitting in my garage now. especially since i forgot i had a take off pair of the exact same thing from two years ago sitting on my bench.

 

[die hard poo]

I would just like to report that the Pro tracks seems to hook up a lot better than the previous 5.1 on the Dragon. Not sure why thought they were the same part number, but all I know is side by side comparison, the Pro's stock track gets it done.

 

[pura vida]

it is the same track so i would guess it has to do with sled weight and geometry. thanks for the report though. good to know.

 

[800poodragon]

The stock Poo track always does seem a bit stiffer and work better for maybe the first 500 miles. Then the tips really seem to get softer.

 

[gonehuntnpowder]

Are the drivers for the IQ and the Pro the same? I am looking at a Pro but want to keep my 162 CE and 7 tooth extroverts. Don't mean to steal the thread, but are the pro's that much better? Anyone have any seat time on them yet? Also looking at a holdover 10 IQ.

 

[pura vida]

drivers are the same. drive shaft is the same. if you want to keep your CE and 7 tooth then you just need to swap them. if it is a 3.0 pitch CE then you need to as the stock drivers are 2.86 pitch

 

[mountainhorse]

Pura... The drivers ARE the same pitch, but the internal spline for the shaft is a different size...The drivers will not swap over.

The shaft Looks the same.. but it is a different size according to Robbie at avid and the lead engineer on the RMK project for Polaris.

 

[AkLogan]

Are the drivers for the IQ and the Pro the same? I am looking at a Pro but want to keep my 162 CE and 7 tooth extroverts. Don't mean to steal the thread, but are the pro's that much better? Anyone have any seat time on them yet? Also looking at a holdover 10 IQ.

i have 2 rides on mine and it is a ton of fun. i have played around on mine and then jumped on a '10 Dragon with a PCV and there is no comparison the pro feels like it has more power. way easier to ride carves better. just a better all around ride