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Old 05-17-2019, 07:32 AM   #1 (permalink)
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Default Longer better?

This is going to sound stupid but if I have a stock 121in track. And i clutch and upgrade my motor on a 03 800 xcsp would it go faster on the big end? In theory its would make sense to put a 136 or a 144 on it but I'm just wondering. My buddy and I dont agree. My thought is that on take off it would have more grip less slip. And on the big end it should go faster due to a longer track. Like a bigger tire. Would it be better to get a team secondary too? That's just my thought. Any opinions would be great.
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Old 05-17-2019, 08:49 AM   #2 (permalink)
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As long as the traction issues with a 121'' track are addressed, i've never seen a longer/extended track sled as a stock xc 800 with the same hp have more top end...cover the first couple hundred ft quicker...yes. There's a bunch of mods you can do to make a sled chassis like that making it faster. I'll say any sled you install a longer track will ride better and have better flotation/traction.
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Old 05-17-2019, 08:58 AM   #3 (permalink)
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much better acceleration, considering the bigger footprint. top end should at best stay close to the same, but if anything you'll lose some top speed.


in all likelihood, you would increase the acceleration even more to take better advantage of the better traction , by gearing down and clutch it more aggressively, since you were not going to pull the stock gearing even in stock track length,you will be leaving a little performance on the table by not.
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Old 05-17-2019, 08:59 AM   #4 (permalink)
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It's going to have slp high flo intake, reeds, balanced crank, cheater heads, tempa flow , twin pipes. So I think itll haul its self up too 100 pretty easy.
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Old 05-17-2019, 09:00 AM   #5 (permalink)
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Originally Posted by Neverfinished800 View Post
It's going to have slp high flo intake, reeds, balanced crank, cheater heads, tempa flow , twin pipes. So I think itll haul its self up too 100 pretty easy.
800 xc should pull that anyway stock pretty well.my 600s pull 90 mph or so on gps on 1000 feet stock with a 144 (clutching , gearing, jetting)
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Old 05-17-2019, 09:27 AM   #6 (permalink)
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Originally Posted by Neverfinished800 View Post
It's going to have slp high flo intake, reeds, balanced crank, cheater heads, tempa flow , twin pipes. So I think itll haul its self up too 100 pretty easy.

"balanced crank" don't waste your money.

BTW, you'll usually lose some top end with a longer track due to rotating mass weight.
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Old 05-17-2019, 09:57 AM   #7 (permalink)
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BTW, you'll usually lose some top end with a longer track due to rotating mass weight.
As mentioned on another post I sent, get an auxiliary cooler or the 800 won't last with twin pipes.
In theory the shorter the LUG of track the higher MPH it will go on hard pack snow as XCR mentioned its lighter and it also pumps less air, you need to balance the track lug height with the number & length of studs.
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Old 05-17-2019, 10:02 AM   #8 (permalink)
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Correct it will get a cooler in the rear. I was going to send the cases out to indy Dan. But I just thought it should pull better from the start with a bigger footprint and more track on the ground. Less slipping at the beginning.
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Old 05-17-2019, 10:27 AM   #9 (permalink)
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It's a balance of track length, track lug, track width and # of studs & length when it comes to traction. It comes down to clutching to put all of the mentioned to proper use. I've seen 121" beat 136/144" but I've also seen 136/144" smoke 121",s. If you want to go to 136/144 go for it, I think we're just saying that its all in the set up buddy.
Here are some numbers so you can see the difference in footprint per size.

121/136/144 tracks using 2.52" drive pitch

121” - 48 total rows of lugs – 16.86 lugs on ground
128” – 51 total rows of lugs – 17.85 lugs on ground
136” - 54 total rows of lugs - 19.87 lugs on ground
144” - 57 total rows of lugs – 22.62 lugs on ground
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Old 05-17-2019, 10:49 AM   #10 (permalink)
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Thanks. It makes more sense now seeing that chart. Should I get a team secondary or just get a helix for my stock seconday.
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