the testing that we have been able to do now has shown the 08 set up we use .used in the 09 doubled the track speed .09 set up over 4000ft in deep snow does not work . on the trail it is a bullet tho.
09 clutching ,what we got
- Thread starter turboal
- Start date
What track, Al? Stock gearing?
And just what is that doubled track speed number? 50? 60? (MPH)
D
drop the hammer
Member
That's not a surprise!! 2009 Clutch change looks promising on paper to the Engineer who designed it and feels great on trail/low elevation/low snow/no incline (like Doo test site in Quebec), or some summer time pulls around the grass. based on their angles/ramps that sucker should hit a wall at 25 mph in the steep & deep. Good thing they are light. my 2 cents. Keep testing Al and the rest of you all and keep us informed on how it goes.
Im in Revvy next week too.
hoping to meet Al again.
hoping to meet Al again.
What??? A reverse helix doesn't work in the deep?? I'm shocked!! Looks like we should stock up on parts for our setup for the '09's.
Im in Revvy next week too.
hoping to meet Al again.
See ya there, Joey....I'll be there Wed - Sun.
What??? A reverse helix doesn't work in the deep?? I'm shocked!! Looks like we should stock up on parts for our setup for the '09's.
ha ha - as we discussed.
same slope same snow , betwen 6000ft and 7000ft we saw stock sled turning mid 30klm's, our 08 set up turning 100kklms.snow was loose and deep enough to make load testing ,finally.
see ya next week joe , more snow forcasted for today and throu the weekend
dave we will finally be able to approach the secret arms hahaha
see ya next week joe , more snow forcasted for today and throu the weekend
dave we will finally be able to approach the secret arms hahaha
Ditto AL 2009 no workie in deep snow no pull rpm efficiantly. My son who has his torn down on the bench getting fixed. Should be no big deal same old historic TRA.
Break out the straight 44, because it's reliable
OT
Kind of funny...Well not really but, we were riding Quartz last weekend in several feet of heavy wet snow and while we were taking a break, we were watching and listening as a couple 09 XP's were climbing. Revs were up, then down, up, then down.
Looks like BRP may not quite have the clutch thing figured out.
Looks like BRP may not quite have the clutch thing figured out.
BRP never has had a setup for deep snow.
OT
OT
I
Insaneboltrounder/sjohns
Well-known member
Very cool of Al to do all that testing and share the results
I
Insaneboltrounder/sjohns
Well-known member
yea i think he messed up his mphs and kphs. Told me trk mph went from 35ish to 60mph
was klms . it really pulled down and wouldnt get past the 35klm mark . we put the stiffer sec spring in first and it dropped the temp in the belt a bit , then we put the 42 helix in and we gained some more but not enough , had to be on clicker 5
changed the ramps and the spring in the primary next and that put the clicker on 1 and the track speed at 100klms in the same snow and slope .
clicker 1 would get to clicker 3 as the depth of the snow gets a lot deeper .
this was with uncut valves , cut them and expect to add 2 grs.
stoc spring ran up the trail at 6500rpms
160/320 dropped the trail running rpm to 5500rpm
cut the valves and it drops the running rpm to 4500 as we added 2 grs,
these thigs are fast when you get them corraled .
400klms on this sled
changed the ramps and the spring in the primary next and that put the clicker on 1 and the track speed at 100klms in the same snow and slope .
clicker 1 would get to clicker 3 as the depth of the snow gets a lot deeper .
this was with uncut valves , cut them and expect to add 2 grs.
stoc spring ran up the trail at 6500rpms
160/320 dropped the trail running rpm to 5500rpm
cut the valves and it drops the running rpm to 4500 as we added 2 grs,
these thigs are fast when you get them corraled .
400klms on this sled
I wonder if the main purpose of the 09 clutching changes by BRP were to minimize the need to change clicker positions between the trail and the POW.
Maybe they should be more concerned about performance of their mountain sled when riding in the mountains!
Maybe they should be more concerned about performance of their mountain sled when riding in the mountains!
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I
Insaneboltrounder/sjohns
Well-known member
Wow... nice work Al. sj
Just a few thoughts
Modifying the primary/secondary springs, pin weight and gearing will impose varying changes to the performance of the clutch system and thus the sled. We can debate the value of any of these components and how change will affect any individual component, however the reality is that modifications made to any of these components will affect the complete range of the clutch system. For example, increasing the finish force on the secondary spring might allow for a great balance in the clutch system at one point in time, but this same change may reduce performance at another point in time. The upside is that these modifications are realtively cheap and are easy to make.
The advantage of a custom helix and/or custom set of ramps are that they offer the ability to impose a modification to the clutch system at a specific point in time. For example, a change that is required at a specific track speed can be made without affecting the clutch system balance at other track speeds. The disadvantage of these modifications are the amount of testing, knowledge and experience required and the cost involved with building a custom helix and set of ramps.
Using a straight helix IMHO gives up an opportunity to build a clutch system that is sensitive to changes in the environment at specific points in time.
I think what separates a good clutch system from a great clutch system is the ability of a great clutch system to provide balance in as many situations as possible. IMHO this balance can not be achieved by simply changing the gearing, pin weight, primary or secondary spring.
Modifying the primary/secondary springs, pin weight and gearing will impose varying changes to the performance of the clutch system and thus the sled. We can debate the value of any of these components and how change will affect any individual component, however the reality is that modifications made to any of these components will affect the complete range of the clutch system. For example, increasing the finish force on the secondary spring might allow for a great balance in the clutch system at one point in time, but this same change may reduce performance at another point in time. The upside is that these modifications are realtively cheap and are easy to make.
The advantage of a custom helix and/or custom set of ramps are that they offer the ability to impose a modification to the clutch system at a specific point in time. For example, a change that is required at a specific track speed can be made without affecting the clutch system balance at other track speeds. The disadvantage of these modifications are the amount of testing, knowledge and experience required and the cost involved with building a custom helix and set of ramps.
Using a straight helix IMHO gives up an opportunity to build a clutch system that is sensitive to changes in the environment at specific points in time.
I think what separates a good clutch system from a great clutch system is the ability of a great clutch system to provide balance in as many situations as possible. IMHO this balance can not be achieved by simply changing the gearing, pin weight, primary or secondary spring.
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