T850 trenching

maxwell

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Well I think these turbo 850 need better clutching, I put in a softer primary spring and went to 33mm pin bolts which are 2 grams heavier in number 1 clicker position, and still revs 8000 RPMS, if they are revving 8100 they are not pulling.

always room for improvement im sure. But lake racing isnt where you would decide how to make those changes.
 

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......
 

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1709

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always room for improvement im sure. But lake racing isnt where you would decide how to make those changes.

How can you race a Turbo sled that has maxed out gearing at 111 Kms down a lake for 1 Kilometer, with clutching that is off at that altitude and expect to beat anyone ?
 
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Teth-Air

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You can’t be serious? Point that thing up hill and load it up. Lake racing proves nothing especially at lower elevation. That’s not how these machines are designed, programmed or clutched to work. Try again in 2 feet of snow up a hill man holy!! Surely I thought you of anyone would understand that

When we went to the higher altitude 7500 ft) and it was steep and deep it felt like it had no more power or pull than my Poo. I was telling it like it is and trying not to be biased. I do like somethings about it but not the things I expected.
 
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acesup800

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How can you race a Turbo sled that has maxed out gearing at 111 Kms down a lake for 1 Kilometer, with clutching that is off at that altitude and expect to beat anyone ?
Clutching isn't off. Remember it is clutched for 165hp at all altitudes....
 

maxwell

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When we went to the higher altitude 7500 ft) and it was steep and deep it felt like it had no more power or pull than my Poo. I was telling it like it is and trying not to be biased. I do like somethings about it but not the things I expected.


Ok man LOL. The sled is noticeably faster than any stock machine you must have one special RMK Lmao. That or I’m thinking you don’t really understand the term steep and deep.


f8af926da181f44dabd603eb1cb9ed9c.jpg
 

Teth-Air

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Ok man LOL. The sled is noticeably faster than any stock machine you must have one special RMK Lmao. That or I’m thinking you don’t really understand the term steep and deep.


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It should be noticeably faster but if it was, barely. And as far as clutching and gearing goes the owner of the Doo did say it sat at 7900 rpm across the lake and felt like it was being held back at that rpm. Maybe it has something wrong with it?? It felt like it was running fine when I rode it on the trail and at 7500 ft in a bowl.
It certainly does keep going at that point where the other NA g4's seem to hit a speed wall.
 

pfi572

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It should be noticeably faster but if it was, barely. And as far as clutching and gearing goes the owner of the Doo did say it sat at 7900 rpm across the lake and felt like it was being held back at that rpm. Maybe it has something wrong with it?? It felt like it was running fine when I rode it on the trail and at 7500 ft in a bowl.
It certainly does keep going at that point where the other NA g4's seem to hit a speed wall.

What you’re saying is what every ski doo I have seen in stock form does .
It just amazes me that a huge percentage think it’s awesome. Lol
 

acesup800

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watch this and tell me the clutching is not off. peak HP 7700 RPMS, next you will tell me his dyno is off. check Neil`s and powderfreaks dyno they all say the same peak HP.
Didn't say the clutching wasn't off, I said it wasn't off due to altitude, which was your claim.
 

Caper11

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It should be noticeably faster but if it was, barely. And as far as clutching and gearing goes the owner of the Doo did say it sat at 7900 rpm across the lake and felt like it was being held back at that rpm. Maybe it has something wrong with it?? It felt like it was running fine when I rode it on the trail and at 7500 ft in a bowl.
It certainly does keep going at that point where the other NA g4's seem to hit a speed wall.

They are. Get that turbo loaded up on a deep hill and see where the difference is.
Your probably comparing a fully box stock sled to a setup NA sled.
That turbo basically has the same clutch setup as a NA 850, some guys that have changed out the secondary setup on a NA 850 have seen an impressive difference in performance. That turbo secondary setup is what guys were running in the mid season of 2017.
HP means squat to me if the power is not getting to the ground properly. Rpm does not necessarily mean good trackspeed.

For a out of the box sled its an impressive piece of engineering, it will be even more impressive when guys start to tinker with them.
 

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What I am saying is that 8100 RPMS is to high, you would be better off at 7750 to 7900 RPMS, at 8100 the torque is down and so is HP
 

1709

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It should be noticeably faster but if it was, barely. And as far as clutching and gearing goes the owner of the Doo did say it sat at 7900 rpm across the lake and felt like it was being held back at that rpm. Maybe it has something wrong with it?? It felt like it was running fine when I rode it on the trail and at 7500 ft in a bowl.
It certainly does keep going at that point where the other NA g4's seem to hit a speed wall.

of course it felt like it was being held back, he was out of gearing. its only good for 69 MPH, and with the turbo`s power it would be maxed out very fast.
 

Teth-Air

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of course it felt like it was being held back, he was out of gearing. its only good for 69 MPH, and with the turbo`s power it would be maxed out very fast.

My 174 is geared for 112 kmph at 8200 RPM. On the first race I pulled ahead and stayed there, Later he got me off the line as I was not paying attention and then I stayed even with his back bumper all the way. Yes gearing will limit top speed but we were in fresh snow and neither sled went full speed as if you were to hit a track it would speed up noticeably.
 

maxwell

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My 174 is geared for 112 kmph at 8200 RPM. On the first race I pulled ahead and stayed there, Later he got me off the line as I was not paying attention and then I stayed even with his back bumper all the way. Yes gearing will limit top speed but we were in fresh snow and neither sled went full speed as if you were to hit a track it would speed up noticeably.

betcha the wastegate didnt release after that drag. Think about it. you were basically drag racing a factory 850
 

maxwell

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Should it not have accelerated faster than a N/A sled?

that snowmobile is reading more sensors than anything else on the snow and making thousands of calculations per second as to how that boost comes on. Thats all im going to say about that.

also, 174 vs 165 your going to have more traction out of the hole. next time, try easing into the throttle in a drag race rather than putting it to the bar. See what happens ;)
 
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