09 clutching ,what we got

[mandingo]

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.

it's an easy thing to fix , ( if you don't like it , don't do it )

 

[sledcrazzy]

Turboal , When you say you cut the rave`s what do you do? I am trying to make an 09 get out of its own way, I would say it has about 130 hp not 150. Any help would be great.

 

[RideGuy]

Great work Al. And to share this with the public at no charge makes you better than the rest!!!

You are a credit to this sport!!

My buddy has an 09 50th anniversery sled that is so sweet!!!! as much as I want to kick his but all year with my set up.....we will be stopping in to see you this year no doubt..... After I work him a for a while in the steep and deep on my O'l 05 RMK 900 Mod with D.D.

How's about using Km/hr and M.P.H. the klmh kind makes me think of Startrek... LOL ... J.K. !!!

I'd love to see what you could get out of my sled if it wern't such a one off crazy ride...... Wayne always said you were a magician!!!

 

[Throttle Junkie]

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.

Amazing.....huh..it's unheard of to hear of a reserve cut helix in the mountains and that's what doo comes out with.....amazing.

 

[craigcolorado]

al will you be selling a clutch if not are you willing to post all the clutch parts you are using to make this track speed. Also could you tell me how to cut the power valves.
Thanks for your help.

 

[GoldenRider1]

I still haven't taken mine out, believe me though all the threads on here about problems with '09's is really discouraging. Maybe my money would have been better spent on an m8?

nate

 

[Priest]

al will you be selling a clutch if not are you willing to post all the clutch parts you are using to make this track speed. Also could you tell me how to cut the power valves.
Thanks for your help.

Hi to all, well my power valves are siting tight in the small box on their way to Canada to meet this guru so he can do some small operation to them and I wraped them with a good paper($) to make operation sucsesfull. Pray for snow and our country please.

 

[turboal]

understanding why doo does what they do helps in making the changes
they needed to meet a sound emmission test , delaying the opening of the power vales till 7400 helps them pass this test.

the clutching was to appease the eastern market were more trail use is done and the previous set up doesnt lend its self to a comfortable trail oporation of the throttle
the reverse helix does and the supporting parts in the primary try and offset some of the woes we might see in the mtns.

there just appeaseing the larger 80 percent market , and this is all driven by a sound emmission test.

clutching a motor that doesnt have a very large power curve based on the late opening of the power valves makes it very sensitive , very similiar to clutching a twin piped motor.

i listed the parts and i always encourage the guys to see your dealer for parts
yes i can get them and put together the parts and will have some here when guys show up and want it but parts aquisition in Revy is like living on the moon,
same with the yellow spring i have told the guys on the south side of the border that they can get it easier than i can
i have never minded sharing what we find inour testing
just got to remmember we have a different snow condition than lots so think about the snow you ride in and weather what we do might work for ya first.

areas with a lot tighter snow will use a different set up likely.

 

[General]

Curious about this power valve thing. What's being done to the power valves to makes them open at a different RPM? Is it just an adjustment? What RPM is the best for them to open at? I pick up my first doo today, just wondering if it's something I can have the dealer adjust before I take it home. Thanks.

 

[kooter353]

clutching

Xcellent work Al !!
Looking forward to your final results.Then a trip out to see you for the mods and a ride.
Thanks!

 

[winter brew]

Al, how about a spacer or double/thicker gaskets under the valve?? Is there a reason this will not show similar results? I'm sure you have tried both, curious why the cut?

 

[I.P.Yellow]

understanding why doo does what they do helps in making the changes
they needed to meet a sound emmission test , delaying the opening of the power vales till 7400 helps them pass this test.

the clutching was to appease the eastern market were more trail use is done and the previous set up doesnt lend its self to a comfortable trail oporation of the throttle
the reverse helix does and the supporting parts in the primary try and offset some of the woes we might see in the mtns.

there just appeaseing the larger 80 percent market , and this is all driven by a sound emmission test.

clutching a motor that doesnt have a very large power curve based on the late opening of the power valves makes it very sensitive , very similiar to clutching a twin piped motor.

i listed the parts and i always encourage the guys to see your dealer for parts
yes i can get them and put together the parts and will have some here when guys show up and want it but parts aquisition in Revy is like living on the moon,
same with the yellow spring i have told the guys on the south side of the border that they can get it easier than i can
i have never minded sharing what we find inour testing
just got to remmember we have a different snow condition than lots so think about the snow you ride in and weather what we do might work for ya first.

areas with a lot tighter snow will use a different set up likely.

Does anyone have the actual part numbers that we are going to need and also what length track was being tested since wouldn't this also make a difference. Thanks, Rick

 

[SHERMAN]

If any of you guys send al you power valves don't forget to send him the 4 little barrel lookin parts also. had to learn the hard way. Are they called booster ports? anyways thanks Al

 

[Vertical Edge]

62 mph track speed,you must now be Non-turbo-al! Nobody would ever need one with that track speed.................Come on guys,sorry........... not buying it

 

[MARV1]

WTH? Is that all the XP's got?

 

[Steeltech]

62 mph track speed,you must now be Non-turbo-al! Nobody would ever need one with that track speed.................Come on guys,sorry........... not buying it

?????Vertical Edge, no need to slag the tuner. This guy is the best in the area.

 

[turboal]

steelteck yes it is high but reflected the snow condition , deeper snow would drop it some and at the same time ask for a higher clicker number . test was done same snow and slope same day.
when we get the over the hood stuff i would expect to see the numbers fall to low 50's but no lower as we saw in last seasons testing on the 08.

undewrstanding track speed , first you have to understand how much snow a given tunnel design will process . tight snow you will see higher track speed numbers due to not haveing much snow on the return stroke in the tunnel
deep over the hood snow shows ultimately the amount of snow a tunnel can process before slowing track speeds.
ie the 07 and older rev tunnels can only process up to low 50 in a proper set up transmissioin as compared to the 08 chassi , it has 1.5 inches of room above the paddles as opposed to the 1/2 inch the previous tunnel has with the same track
new xp tunnel can process about another 10 mile an hour track speed in the deep stuff as compared to the previous tunnel .

this is why when talking track speed it is always relavent to keep inmind the type of snow .
hard pack delivers outrageous track speed , buried over the hood stuff delivers the lowest .

 

[Throttle Junkie]

62 mph track speed,you must now be Non-turbo-al! Nobody would ever need one with that track speed.................Come on guys,sorry........... not buying it

First 62mph track speed with a turbo and you have a turd on your hands....most turbos are well above that...

My XP last year would run in the low 50's on what I would call a junk setup so with a correctly setup sled and the correct conditions I will buy a 62mph track speed. My mod triple was right in there at 60mph with a 159 and there is no reason the XP when setup correctly can't get above 60. I have a new setup for mine this year and I am hoping to see above or close to 60 on some days.

 

[Vertical Edge]

First 62mph track speed with a turbo and you have a turd on your hands....most turbos are well above that...

My XP last year would run in the low 50's on what I would call a junk setup so with a correctly setup sled and the correct conditions I will buy a 62mph track speed. My mod triple was right in there at 60mph with a 159 and there is no reason the XP when setup correctly can't get above 60. I have a new setup for mine this year and I am hoping to see above or close to 60 on some days.

Track speed to me is climbing right before you turn out,thats what you have............otherwise it's pretty much ground speed.No way 62mph.

 

[caper11]

On a fully loaded track in the pow with the 09 clutching i'm getting around 45 mph of track speed, when using a cheater track i'm up to 50 mph, and this sled pulls hard! and that was easing into the hill and 1/4 the way up I pin it to see what track speed i'll get. I like the backshifting as well. I've have no complaints other than I have to pull the setscrews to get in a lower clicker position, i'm on five and it pulls 8100 to 8300rpm, Does anybody know for sure if there is a break in chip in these sleds because my buddy can't pull the rpm that I can and he has the setscrews pulled already, I'm wondering if some sleds have a chip and some don't.
any thoughts??