SLP Boost Clutching

[cmcgillis]

Is anybody running the SLP power shift kit for the 22 boost? The theory behind the weight profile is interesting.

I’d like to know if it performs as advertised.

From SLP,

This clutch kit uses our innovative patents pendin Magnum Force Ultra Weights[emoji769] which utilizes a slingshot effect to transfer the Polaris Boost's impressive horsepower to the ground with precision using our industry exclusive mass profile. Its design delays initial shift, allowing the turbo to spool faster and then shifts aggressively, loading the engine and creating more exhaust heat. This improves boost function and generates more useable power quicker. The kit also includes a primary spring.


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[Sheetmetalfab]

The slp weights conflict with the new billet P22 spider.

 

[cmcgillis]

The slp weights conflict with the new billet P22 spider.

They’re only for MY22 boosts.


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[Sheetmetalfab]

They’re only for MY22 boosts.


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Yeah but as soon as you need a new clutch then the weights become obsolete?

I just put the new clutch with updated spider on my 22 boost.

My clutch kit works great.

(It’s also from the original company that SLP ripped off the weight design from)

Indy specialty has been making weights with that same conceptual idea since 2017 (or earlier that’s just when i saw them)

 

[billdelong6384]

I used the SLP weights last year. Performance was nice. Nice and snappy on the very bottom end. That’s the good. The not so good was a weird shift out at about 16MPH. It would go from the equivalent of 1st gear to 3rd or 4th gear as the sled increased in speed. Right at about 16MPH. Sort of annoying. After the weird shift out the sled was very lethargic accelerating until the turbo power would finally catch up. The other not so good thing was the weights wore distinct grooves in them near the heal. Once these grooves wore into the weights they would hang up on the grooves while trying to spool up.



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[cmcgillis]

Good info, thanks guys. Sheetmetalfab, you aren’t experiencing these negative characteristics with the Indy specialty kit?


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[Wheel House Motorsports]

They work well. The little leg thsts behind weight centerline pulls up engagement and causes a way snappier bottom end then passes centerline and results in big upshift suddenly as described in pervious post. Riding around this 16-20mph area (depends on weight loading) there is a drastic change in feel.

Overall I liked them as they liven the bottom up a lot especially at high elevation and allowed use of a lower start rate spring which have less breakage issues.

 

[Sheetmetalfab]

Good info, thanks guys. Sheetmetalfab, you aren’t experiencing these negative characteristics with the Indy specialty kit?


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I have 400 miles on my indy specialty setup.

No wear on the weights.

It rips my arms off throughout the shift range.

57-58 mph trackspeed.

 

[billdelong6384]

From my post above I should have mentioned that for this year I decided to go with a P85, and TRS’s clutching. Awesome so far! Has the same awesome low end snap that the SLP setup had, but the TRS / P85 setup has almost no upshift at that 16MPH area. Had I not been looking for any shift out change at 16MPH I would not have even noticed the little bit that it has. Anyway….


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[Billy Bigrigger]

The slp weights conflict with the new billet P22 spider.

Yep, just found out on my maiden voyage. Weights catch the billet spider.

 

[Dogmeat]

Ok I am not seeing what is going on with these SLP weights ... I ordered the kit off their website that they said was for 22-25 Boost sleds and I didn't have a single issue with clearance on the clutch? I ordered P/N 41-580 from them which came with weights 40-170M .... am I missing something here?

 

[Sheetmetalfab]

Only the billet spider has clearance issues.

With weights bought before summer 2024.

Cast or forged spider no issues.

Later mfg date no problems.