What Clutch Weights for 8100 RPM - Page 5 - HCS Snowmobile Forums

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Old 02-13-2020, 07:18 PM   #41 (permalink)
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I just got my Dalton QAP 4s, anybody have a good start state with the Daltons before I go out and spend a day tuning it? Mines a 129” with the 1.25” Ripsaw studded. There’s a local drag race this coming weekend that I might enter if I can get the clutches tuned in time.
How long of a race? With stock helix I find my sled a little lazy on the back shift when i load up my daltons...but is 100% pulls more mph. My testing show best speed/ET with 7900 on launch...creep up to 8050 ish on long run.

I really don't feel like spending money on another helix right now...but I suspect if I ran slightly less weight, with steeper helix finish angle I would find the happy medium.
The race is 660 feet, I played with it a bit today but didn’t get it to where I want yet. The helix is stock. When you say loaded up, which weights?
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Old 02-14-2020, 09:17 AM   #42 (permalink)
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was turning consistent 8250 with some 8300 flashes put in 10-74 now 8150-8200 its definitely stronger and worth doing. cobra track studded 550 miles still not happy with top end hits a wall at 102 105 max on good lake conditions
gear it down. 1.73 ratio. we are getting 116-118 mph with that ratio and that track 77.5 grams of weight. SLP magnum force. or just as good of top end with E.P.I. belly buster 76 grams.

my own 850 with a storm track goes 109-110 mph. up from 98-99 stock. read the report about our clutch kit. gained 10 mph as well on a not broke in sled.

stock 850 8000-8150 tops rpm. and make sure your clutches are fully shifting out. if not drop the gearing. just like the 800's they can't pull a 1.61 or a 1.68 ratio.

i won the 850 class last year a a radar run 84 mph in wet loose snow @ 45 degrees out 660' and we tied the open class @ 89 mpg with a 800 assault. tied a 290 h.p. BCM tuned sidewinder. we know how to make these fast.
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Old 02-14-2020, 11:06 AM   #43 (permalink)
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gear it down. 1.73 ratio. we are getting 116-118 mph with that ratio and that track 77.5 grams of weight. SLP magnum force. or just as good of top end with E.P.I. belly buster 76 grams.

my own 850 with a storm track goes 109-110 mph. up from 98-99 stock. read the report about our clutch kit. gained 10 mph as well on a not broke in sled.

stock 850 8000-8150 tops rpm. and make sure your clutches are fully shifting out. if not drop the gearing. just like the 800's they can't pull a 1.61 or a 1.68 ratio.

i won the 850 class last year a a radar run 84 mph in wet loose snow @ 45 degrees out 660' and we tied the open class @ 89 mpg with a 800 assault. tied a 290 h.p. BCM tuned sidewinder. we know how to make these fast.
Was wondering about the Magnum force weights for my 850 but I didnt think they were heavy enough so I checked their site. I see they now have an extra heavy set available. I have these in my 800 and they work great.
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Old 02-14-2020, 02:32 PM   #44 (permalink)
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gear it down. 1.73 ratio. we are getting 116-118 mph with that ratio and that track 77.5 grams of weight. SLP magnum force. or just as good of top end with E.P.I. belly buster 76 grams.



my own 850 with a storm track goes 109-110 mph. up from 98-99 stock. read the report about our clutch kit. gained 10 mph as well on a not broke in sled.



stock 850 8000-8150 tops rpm. and make sure your clutches are fully shifting out. if not drop the gearing. just like the 800's they can't pull a 1.61 or a 1.68 ratio.



i won the 850 class last year a a radar run 84 mph in wet loose snow @ 45 degrees out 660' and we tied the open class @ 89 mpg with a 800 assault. tied a 290 h.p. BCM tuned sidewinder. we know how to make these fast.


Rick what sort of mods were lurking around the 800?
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Old 02-14-2020, 02:41 PM   #45 (permalink)
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Was wondering about the Magnum force weights for my 850 but I didnt think they were heavy enough so I checked their site. I see they now have an extra heavy set available. I have these in my 800 and they work great.
the 65 gram base can work with the heavy set screw kit they sell , i just put a set on ebay if anybodys looking .
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Old 02-14-2020, 04:35 PM   #46 (permalink)
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I have magnum force in mine loaded about 75 grams. Holds 8000, pulls hard up to 108 on my assault with 1.6 cobra.
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