What is ideal WOT RPM?

[IceCap]

I am running 10-62 and stock everything on a 163" track.

Elevation 5-6000ft..... when I first got the sled it ran 8100 rpm in deep snow steady climb.

Now I have 230 miles on the sled and in 3ft of fresh on a steady climb it is consistently 8300 rpm.

My question is at what rpm does this motor make the most power?

I was wonderiing if I should add another gram of weight to the primary and try to bring it down to 8100-8200 rpm?

 

[AKSNOWRIDER]

I ran mine against a bonestocker(mine has clutching changes) identical stock springs, finish angles..his pulling 8100,mine 8300..mine consistently out pulled his regardless of rider...on one steep climb that his sled was down to just making over he took mine over pulling at least 5-6 mph more ground speed...

 

[FatBoyzfrenchy]

What's your clutching change?

FBF.

 

[AKSNOWRIDER]

different weights , primary spring and helix(same finish angle though)..setup doesnt like the stock secondary spring..so I will change that for the next ride...once I find a setup I like I will post a thread with everything on it..just as i did with the dragons...this setup worked very good..just hot secondary clutch...and it had a limited elevation change before it was hitting the rev limiter...which i think a spring change will cure...its very very snappy...even over stock..yet pulls even harder....

 

[aebsledder]

I love these threads. People are starting to get different set-ups dialed in on their own without paying an aftermarket company who has already done the R and D. I was kind of wondering what AK's clutching changes were too. He said identical springs and finish angles...so different weights? I have the 62's in mine, but I think I am going to change to 60's. I ride mostly between 7-10,000 feet, and I notice I lose RPM's fairly significantly as I gain elevation. I was also thinking about swithching to an SLP blue/pink spring. It has the same engagement as the stock primary spring (140) but a slighly higher finish (340). Any opinions? Clutching made the biggest difference in the performance of my dragon by far. It seemed to run the best at around 8300 rpms. I haven't been able to reach those r's with my pro for any extended period of time (I think my max was 8250) so I don't know how good it would run. I do know if I could get it to pull 8200 at elevation in deeper snow and or climbs it would be even more amazing than it already is.

 

[IceCap]

So at what RPM do you hit the rev limiter? What happens when you hit it?

I have to say I was really impressed with the pros performance yesterday in 3ft of fresh.
So maybe just leave the clutching ..... and run it at 8300 RPM.

 

[AKSNOWRIDER]

I love these threads. People are starting to get different set-ups dialed in on their own without paying an aftermarket company who has already done the R and D. I was kind of wondering what AK's clutching changes were too. He said identical springs and finish angles...so different weights? I have the 62's in mine, but I think I am going to change to 60's. I ride mostly between 7-10,000 feet, and I notice I lose RPM's fairly significantly as I gain elevation. I was also thinking about swithching to an SLP blue/pink spring. It has the same engagement as the stock primary spring (140) but a slighly higher finish (340). Any opinions? Clutching made the biggest difference in the performance of my dragon by far. It seemed to run the best at around 8300 rpms. I haven't been able to reach those r's with my pro for any extended period of time (I think my max was 8250) so I don't know how good it would run. I do know if I could get it to pull 8200 at elevation in deeper snow and or climbs it would be even more amazing than it already is.

AB, so far it does pull harder up higher in rpm's..problem is on any track unload it hits the rev limiter and will bog for a second...8300 seems to work in the steep/deep stuff so far though...on the trail up (and I have it well loaded in the middle range)I was hitting the limiter at 1/2 throttle(1000 ft lower elevation)and with the stock secondary spring it will hit the limiter on any firm snow...but I have a few ideas to try and we will see what it does then...

 

[AKSNOWRIDER]

So at what RPM do you hit the rev limiter? What happens when you hit it?

I have to say I was really impressed with the pros performance yesterday in 3ft of fresh.
So maybe just leave the clutching ..... and run it at 8300 RPM.

it looks like 8500-8550..i hit it right at mid hill between some big trees..(no wiggle room)and it bogged big time..had to back off the throttle and then get back into it..lost all ground speed and was thinking..this is gonna be ugly..but it picked the ski's up and proceeded to pack *** right over the top...really impressed me..I know my dragon would have been done...none of the other guys would even try it after they saw me ...really hard to watch the guages with so much going on...

 

[aebsledder]

AB, so far it does pull harder up higher in rpm's..problem is on any track unload it hits the rev limiter and will bog for a second...8300 seems to work in the steep/deep stuff so far though...on the trail up (and I have it well loaded in the middle range)I was hitting the limiter at 1/2 throttle(1000 ft lower elevation)and with the stock secondary spring it will hit the limiter on any firm snow...but I have a few ideas to try and we will see what it does then...

Nice. I am probably going to switch weights and maybe try the blue pink since I have it in my garage. I have to tweak my set-ups a little different than yours since we have such a big difference in elevations, but different starting points are always nice. I am so jealous of the lower-elevation riders in AK. You guys still get all the hills and fun stuff, but at a lower elevation. I notice how much stronger mine runs at 6,000 compared to 10,000. I couldn't even imagine how good it would run at sea level to 3000. Would probably feel like a turbo.

 

[AKSNOWRIDER]

Nice. I am probably going to switch weights and maybe try the blue pink since I have it in my garage. I have to tweak my set-ups a little different than yours since we have such a big difference in elevations, but different starting points are always nice. I am so jealous of the lower-elevation riders in AK. You guys still get all the hills and fun stuff, but at a lower elevation. I notice how much stronger mine runs at 6,000 compared to 10,000. I couldn't even imagine how good it would run at sea level to 3000. Would probably feel like a turbo.

this weekend we rode from parking lot aprox 3000 ft...riding area was 4-5000 ft..but yeah its nice having the power...I notice the difference just between sea level(we have several areas with good riding right on the deck..and other areas that start at 2500-3000 ft...cant imagine at 10000 ft...

 

[IceCap]

I have noticed a short bog once in a while.... sometimes right after we have sat for a while.
Even though I do let it idle for warm up for a minute or two.... to let the temps stablize and go up to 110 min before I get on the throttle.
The other time it has bogged was at WOT climbing..... I think maybe I am hitting the rev limiter at that time.
The other bog just after sitting..... I think this maybe that the pipe is not hot enough.

The 06 900 166 I ran previously had a bog ..... almost always....right after sitting for a while.
I always had to crack the throttle a few times and circle around a bit to heat up the pipe before a good pull.

 

[cobaltpilot]

I have noticed a short bog once in a while.... sometimes right after we have sat for a while.
Even though I do let it idle for warm up for a minute or two.... to let the temps stablize and go up to 110 min before I get on the throttle.
The other time it has bogged was at WOT climbing..... I think maybe I am hitting the rev limiter at that time.
The other bog just after sitting..... I think this maybe that the pipe is not hot enough.

The 06 900 166 I ran previously had a bog ..... almost always....right after sitting for a while.
I always had to crack the throttle a few times and circle around a bit to heat up the pipe before a good pull.

IceCap,

I see the same bog as you - sometimes after sitting for a while it'll do some strange bog thing either for a half second or for a couple seconds when after sitting you ask for WOT.

I tried 10-64's but the sled performed much better with the 10-62s that are stock.

If you want to try the 10-64's or the EPI 62's I can lend them to you.

 

[wyodragon]

RPM

I have all stock set-up but changed to 60's at the dealer. I am pulling 8250 at 8,500 ft elevation. Seems about right. I am going to leave it alone. It will run right up to 8500rpm at 6,000 ft so I never hammer it until we get up a ways.

 

[Jaynelson]

Has anyone seen what kind of track speed you are getting at different RPM?

Also if you pull the secondary off, are there 2 different helix angles to try?

 

[goforbroke]

Dealer told me rev limiter is 8550 and cuts out and at 8800 rpm will shut down, like actually turn off. I hit the cut out and it sure drops the rpm, so I can't imagine ever hitting the 8800. at 8150 rpm and 9500 feet with mtx 62, (similar to 58's) I was getting 40 mph. one pull 42mph. just at 200 miles so hopefully I can pull 8250-8300 rpm as it seems to pull harder there to me, but I don't have a track speed to verify. I'll try tomorrow.

 

[B2]

Has anyone seen what kind of track speed you are getting at different RPM?

Also if you pull the secondary off, are there 2 different helix angles to try?

Only one cut on the stock helix - 56/42-0.36 if memory serves me.

 

[IceCap]

Cobaltpilot What elevation do you ride at?

What RPM difference did you experience between the 10/62 versus 10/64?

I was thinking of purchasing 10/64 and grinding them down to 10/63..... I was thinking that the 10/64 would be a bit too heavy.

 

[cobaltpilot]

IceCap,

Riding 6000-8000 here in Whistler area. 10-62's seemed to run 8100-8400 with a pull down to 8050 or so on a long pull. 10-64's seemed to run 8000-8150 but pulled down to 7650 on a long pull. 10-62s didn't seem to load it enough to my liking but the 10-64's didn't let the secondary recover enough to my liking.

You may be right to try 63's. I would be interested to hear what you find.

Track speed seemed to be around 41-44mph with either weight until the RPMs dropped off on the 64s.

This was 155" at 7300 feet, a couple feet of fresh snow.

One thing I've found is when we get back to trailer at the end of the day is that the RMK is always about 5% lower than the Cat or the Doo on the odometer even if we are riding same lines all day together. This fact makes me think you can't using the speedo as an absolute measure of the track speed performance against other brands. Just a relative measure against your different setups on the same machine.

 

[THEPOWDERHOUND]

Nice. I am probably going to switch weights and maybe try the blue pink since I have it in my garage. I have to tweak my set-ups a little different than yours since we have such a big difference in elevations, but different starting points are always nice. I am so jealous of the lower-elevation riders in AK. You guys still get all the hills and fun stuff, but at a lower elevation. I notice how much stronger mine runs at 6,000 compared to 10,000. I couldn't even imagine how good it would run at sea level to 3000. Would probably feel like a turbo.

Not quite like a turbo, but huge difference. Sorry

 

[IceCap]

It seems that you guy's like the performance of the PRO at 8300 rpm........ and I have to agree.
Does anyone have the Dynotechs H.P., torque chart when he did his dyno run?

Just curious as to see at what RPM peak H.P. and torque are?

BTW has Jim done anymore dyno runs?