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Question on Top Speed and RPM after 1000km

JayM

JayM

Expert
Joined
Oct 29, 2018
Messages
476
Age
45
Location
Pickering, ON
Country
Canada
Snowmobile
2017 Sidewinder R-TX SE
On my R-TX SE that I just got this year I just put on 1000km so far this winter, decent for living in Toronto lol.

I did 1st engine/chaincase oil change at 500km because I was heading up North for a 800km + trip and didn't want to do it after.

I have Max Spool 17, 3Bar, intake, TD Super Quiet, Primary/Secondary Springs and Rollers, Dalton Helix, Dalton DTYA weights with 78g, Ultimax XS825 belt, 135 x Megabite 1.575's, probably missing something, stock gearing.

I'm seeing 8950rpm and fastest I saw was 105mph, having said that I haven't really held it for too long for fear of a: blowing the belt and b: fear of hitting the Rhubard at crazy speeds lol

Does the rpm seem right? It's real snappy in the trail I absolutely LOVE this thing. So darn fast!

How long are you holding it WOT to hit the 120mph+ speeds?
 

Rpms are good. Last year geared 22/41 I ran 131 in 2000' and 124 in 1320' with a 1.25" track and 192 1.575 Megabites. This was running TD max17. This was on ice.

This year I'm running max spool 17, shaved my track to 1", sharpened my studs and removed 48 of them, will be gearing up to 22/37 (37 gear back ordered) and hoping to hit 130 in 1320' on pump gas.
 
JayM said:
On my R-TX SE that I just got this year I just put on 1000km so far this winter, decent for living in Toronto lol.

I did 1st engine/chaincase oil change at 500km because I was heading up North for a 800km + trip and didn't want to do it after.

I have Max Spool 17, 3Bar, intake, TD Super Quiet, Primary/Secondary Springs and Rollers, Dalton Helix, Dalton DTYA weights with 78g, Ultimax XS825 belt, 135 x Megabite 1.575's, probably missing something, stock gearing.

I'm seeing 8950rpm and fastest I saw was 105mph, having said that I haven't really held it for too long for fear of a: blowing the belt and b: fear of hitting the Rhubard at crazy speeds lol

Does the rpm seem right? It's real snappy in the trail I absolutely LOVE this thing. So darn fast!

How long are you holding it WOT to hit the 120mph+ speeds?
Click to expand...

Sounds right....did you see any knock lite? Or are you running higher fuel? Id hold that til you see a knock lite.....lol

Are you running 91 and nothing else?
 
ROCKERDAN said:
Sounds right....did you see any knock lite? Or are you running higher fuel? Id hold that til you see a knock lite.....lol

Are you running 91 and nothing else?
Click to expand...


I'm running only 91,whatever 91 I can get either Esso or Petro around here. Haven't seen a knock light no, I assume I'm just not holding it long enough. I will try and man up tomorrow lol
 
One thing I haven't mentioned is my belt sits maybe 1/16th to 1/8th below the top of the secondary sheaves. I need to get proper sized Washers so I can adjust that up a bit, unsure of the impact deflection has on rpm/speed.
 
JayM said:
One thing I haven't mentioned is my belt sits maybe 1/16th to 1/8th below the top of the secondary sheaves. I need to get proper sized Washers so I can adjust that up a bit, unsure of the impact deflection has on rpm/speed.
Click to expand...


Deflection has nothing to do with rpm or speed.
 
KnappAttack said:
Deflection has nothing to do with rpm or speed.
Click to expand...
Deflection affected the top end speed on both my poo and apex,belt too high and I lost mph
 
JayM said:
One thing I haven't mentioned is my belt sits maybe 1/16th to 1/8th below the top of the secondary sheaves. I need to get proper sized Washers so I can adjust that up a bit, unsure of the impact deflection has on rpm/speed.
Click to expand...
I do like the adjuster for getting belts nice and taught for deflection, I am always re-setting mine as i'm OCD and for tight trails,corner to corner a tight deflection makes for more snappiness down low.

If its below, you can have a poor drive off.....but as mentioned above, once running along, the belt will find its sweet spot at any given ratio, dictated by the springs,weights, and speed/rpm ect. But still, I am OCD about deflection anyway and it's a good habit to be in. The Cat setup is quite awesome which I would love about the TEAM. Next time you see a cat 998, check belt..its TIGHT!

Dan
 
what were the temps? smell any plastic....lots are running in less than great temps and conditions...just saying..
 
So an update, I found a nice smooth hard pack lake to run on and in the shortish distance I saw 116mph this time. I'm seeing just under 8900rpm. I'm just too chicken to hold it longer lol I much rather have the 20-60mph acceleration than the top speed I think.


@ROCKERDAN we need you to get a Team clutch setup done and let us all know how-to lol
 
I'm assuming it's still pulling hard at 116. You should be fine to hold it till about 125 then get out of it. You won't hurt the engine as long as there isn't knock. You just don't want to hold the clutch at full shift for very long. I thing people are hitting 128-130 on stock gearing at full shift when Rpms start to climb toward rev limit.
 
I am not condoning full throttle pulls on trails, but 105 at the correct rpm's seems low.
Find a lake, PIN the BITCH then re-post.
I saw 120 speedo on trails & 124 on lake at 9000 rpm's with Powertrail.
Stock i would see 115 all day.
 
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