Guys, getting ready to run my new 2012 Pro-RMK. What RPM should I shoot for? I have seen people turning 7800-8400 on the forum, but I haven't heard what my target is. For instance, on my 900 I had a hard limit of 7900. Where should I consider the edge of sanity?
What RPM should I be targeting?
- Thread starter nd_switchback
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theultrarider
Well-known member
x2. Right at 8000 and get it to hold there. You will be very happy.
Mine seems happiest at 8100. It will see 8250 at times but it pulls hardest at 8100.
Seeing between 8000 and 8100 at 3-6000 Ft, not sure it matters but I have left the ethanol plug as if I were running Ethanol fuel.
Ours seems happiest at 8200+. Definatly slower at 8000 but evey sled and setup will vary.
brew, we have found with the pro that a max of 8100 produces better on the hill....once over that(82-8300+) it feels like it is getting it..but run against an identical sled turning 8100 and the 8100 sled has always climbed better...(we even swapped clutch kits right on the hill and results were the same....)
Another vote here for 8,000 to 8,100.
The bone stock setup makes 15% less HP/TORQUE at 8250 then it does at it's peak of 8040. The fall off of power above that is dramatic! Why would you want to tune a sled to operate outside of it's peak power curve?
Paul is that a stocker exhaust and porting? My tests conclusively show that if we set up a sled to pull 8200 it will be about four lengths slower from A to B and never actually close until we run out of pull or race track. Seat of the pants feels like the sleds want to run at 8200 as a happy spot but the actual field results were slower and with a hotter sheave and belt on the same duration.
Now furthermore we can take a dead on setup that pulls instantly to 8000 without significant fade either drag racing or hillclimbing and add 200 rpms with a secondary spring change only and BAM heat fade and a much slower sled over all. It will still pull the bottom and mid exactly the same but from 7200 to 8000 the better consistent never over 8100 but usually right at 7950 to 8050 sled is going away significantly. The clutching experience goes absolutely right in line with the results of stock dyno runs that we saw and it all makes sense now.
You need loaded traction IE heavily loaded pull through 7200 RPM... then you need a setup that will hold 8000 no matter what you are asking of the sled. It's really clear when you compare.
Paul is that a stocker exhaust and porting? My tests conclusively show that if we set up a sled to pull 8200 it will be about four lengths slower from A to B and never actually close until we run out of pull or race track. Seat of the pants feels like the sleds want to run at 8200 as a happy spot but the actual field results were slower and with a hotter sheave and belt on the same duration.
Now furthermore we can take a dead on setup that pulls instantly to 8000 without significant fade either drag racing or hillclimbing and add 200 rpms with a secondary spring change only and BAM heat fade and a much slower sled over all. It will still pull the bottom and mid exactly the same but from 7200 to 8000 the better consistent never over 8100 but usually right at 7950 to 8050 sled is going away significantly. The clutching experience goes absolutely right in line with the results of stock dyno runs that we saw and it all makes sense now.
You need loaded traction IE heavily loaded pull through 7200 RPM... then you need a setup that will hold 8000 no matter what you are asking of the sled. It's really clear when you compare.
Did some longer pulls on a long hill with some firmer snow (not hard, not really powder) this weekend just to watch the rpm.
Jumped to 8100 first and then settled into around 7900-8000. 7500 feet. 200lb rider.
Feels great at that rpm. Bone stock.
D
Jumped to 8100 first and then settled into around 7900-8000. 7500 feet. 200lb rider.
Feels great at that rpm. Bone stock.
D
ND I dont know where your going to ride? But when I had mine out by Sheridan it was only running about 7900, they also said it could be part of the break in chip doing that also? So if you say its new it might be cut back at least a little bit.
