• We are no longer supporting TapaTalk as a mobile app for our sites. The TapaTalk App has many issues with speed on our server as well as security holes that leave us vulnerable to attacks and spammers.

Aftermarket clutch weight testing from this weekend

STM makes the 38 and Ulmer has them also.. I do believe STM makes them for Ulmer. I really like mine.. Definitely need secondary pocket opened up for spring bind.. I have POUNDED my sled very hard with a 8dn and straight 38 secondary wrapped at 3/3. Yellow/green/yellow Yami primary spring.. 120 + on hard pack trail.. Very clean clutches.. pulled 105 at 3/4 throttle... Speedo not GPS.. But since I switched to this helix and machined spring pocket, I have zero belt issues. BETTER gas mileage . Not afraid to hold her, and actually get on and OFF throttle hard at cruising speeds.. IMO its the on and off hard punches that zap the belts. The higher helix angle seems to help.. What's really funny is compared to stock helix the 38 actually back shifted WAY MORE wrapped at 6/1.. I had to go back to 3/3 to stop getting thrown over bars when letting off hard.. 38 helix actually helped the engine brake more and became a lot more noticeable. Conventional clutching says less helix angle more back shift? Not the case with my set up.
 

HH thunder weights have 3/4 slug in heel, aluminum 3/8 (0.9) grams in middle, 7/16 steel and two thin washers in tip.. 9000-9100 on the punch - settles at 8500-8600-climbs to 8800.. This is on hard pack trail with 192 studs, TD eco trail flash, TD turbo force muffler, stock gears..911 primary cover.. Ulmer rollers
Just wanted to give the rest of my set up.. And no I did not get Ulmers kit.. I ordered straight 38 from STM.
BUT I SURE do like his choice for a helix!
 
Last edited:
actionjack said:
Interesting my Winder feels like it has ZERO engine braking on backshift.
Click to expand...
This is what I find the strangest thing about my sled and the clutching.. Stock I felt or heard zero engine braking.. I put the 38 in and it was instant a TON of back shift and could hear and feel the engine braking. But felt it was to much and off with the clutching some.(the braking felt out of rhythm with the clutching) Almost like the clutching was back shifting way to soon and faster then the engine braking.. . SO I went back to secondary wrapped 3/3 and it was like YES! I like! And the sled would back shift slightly and BANG the engine would brake and it just felt good.. Some times Its about what I feel and I know some may say that's not a good measure but I know when it feels right...
 
Last edited:
Snowaddict said:
Yes. Sorry typo. I changed it in above post. 35/39 from Dalton. Also, have my secondary machined for coil bind. (Thanks again to NOS-PRO.)
Click to expand...

You are welcome bud!!!
 
Tried the 33/35 helix this weekend and it really revs quick now! If I had picks or hardpack.....DAMN!!!
 
Also, OSP new design weights are awesome! I ran 130 GPS (135mph on speedo). This was in Michigan on a slightly snow covered hardpack trail.
 
Shagman, that going to be a problem for us guys that had the secondary pocket machined?
 
Just bringing this post back to life as there is a lot of great info just in this post alone.

Things that were addressed this year was inventing and testing a new orange secondary spring from Thunder Products that is the same twist pressure and more side pressure than the stock sidewinder secondary spring. Awesome on asphalt, grass and a little trail testing last winter.

Now with more and more tunes/flashes out there.....this year is going to be crazy fast sleds on the trail! Along with that come some really good clutch setups. Let's keep this thread going with clutch setups so everyone can post or take notes.

*****To all who have a SW or have one coming.....please ride safe out there! I know everyone wants to be the biggest and baddest out there...but this sled has soooo much power (especially with add-ons) that it will be a big change from non-turboed sleds you may currently ride. Even the turbo guys that are messing with this sled are seeing faster speeds, quicker take offs and freight train pull. Just be careful and know your surroundings. This sled has become very popular, the hpr is the most on the market, the speeds are crazy fast......but you need to remember.....you still only have 1 brake rotor and 1 track trying to stop you at these speeds. Be safe! Ride smart! If you are going to run someone....find/check an area where you know you won't hit deer or an ice crack or heave. With that I say... HAPPY TRAILS EVERYONE!!!****
 
I have the up most respect for the guys at Thunder products..come up with some pretty good ideas...even my SRVIPER needs better spring...but your words confuse me..same twist pressure...but more side pressure.....so if you scale the clutch...and had say 15#'s. on the spring.....it would stay the same....so how can compression (I think you are saying that) change..maybe a web link to the spring would help.
 
if you hold the secondary spring in your hand....pinch the coils closer to each other....thats compression.....the two tangs being twisted radially ...thats torsion...
 
RJH said:
I have the up most respect for the guys at Thunder products..come up with some pretty good ideas...even my SRVIPER needs better spring...but your words confuse me..same twist pressure...but more side pressure.....so if you scale the clutch...and had say 15#'s. on the spring.....it would stay the same....so how can compression (I think you are saying that) change..maybe a web link to the spring would help.
Click to expand...
The new Dalton sec spring has many design factors changed from stock spring. The SW being a turbo makes more power with more rpms, as the turbo is spooling faster making more boost. So getting that turbo spooling earlier can make acceleration faster. The stock sec spring is pretty lazy.

To get more rpms down low, yet keep Similar rpms up high, Dale has created a spring with more side pressure(compression) and Similar Torsional pressure. So the tangs will twist with similar rates to stocker(expecially upon full twist at top speed).

With compression springs(only) like most sleds have today in the secondary, you can spec a compression spring to have a hi compression rate initially, and a modest compression rate at full shift(fully compressed) This is done by choosing coil diameter, number of coils and several other factors.

So with a half season of riding the SW last year, many of us KNEW what was needed to wake these up, and now we have at least 2 secondary springs available to us. Dale(Dalton) has a nice write up on his site,along with actual rates and comparisons to STOCK yammie sec springs...for comparison sake. Take alook below.

Dan

New Dalton black/orange
dalton sec spring.jpg


Comparison to stock
Dalton Secondary spring.jpg
 
You must log in or register to reply here.

Similar threads

S
Clutch weight bushings?
Replies
6
Views
1K
DMCTurbo
DMCTurbo
MattB_Qc
3200 km and need to change roller, weight, washer of Clutch ?!
2
Replies
21
Views
2K
KnappAttack
KnappAttack
W
2020 SW LTX GT Ski and Carbide Input
Replies
1
Views
2K
hibshman25
hibshman25
snowdust
Clutching for corner to corner
Replies
7
Views
4K
snowdust
snowdust
Derailed
The Clutch Rabbit Hole
2 3 4
Replies
52
Views
4K
Upstater57
Upstater57


Back
Top