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Ski-Doo: REV Gen 4 For the 2017 and newer REV Gen 4 Sleds
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Old 04-17-2018, 10:47 PM
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Default Optimal RPM

Called several shops about clutching.

Most say 7950 to 8000

A couple say 7900 plus minus 50.

What do you say?
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Old 04-17-2018, 10:57 PM
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Default Rpm

7971 rpm on the dot no more no less!
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Old 04-17-2018, 11:19 PM
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Here. RPM, horsepower, torque stock 850.
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Old 04-18-2018, 08:41 AM
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Quote:
Originally Posted by Clutched Films View Post
7971 rpm on the dot no more no less!
Thank you for the precise concise number. Will the accuracy of the RPM meter allow such accuracy?

Called 4 shops yesterday.

Was interesting the ones I've done business for decades say leave it stock and use the existing clickers to get 7900. Only get a clutch kit if sled was modified.

Maybe change the spring and or helix to lessen the trenching by engaging at lower RPMS also helps backshift.

New shops I called said to get a kit and strive for 8000 RPM

Not uncommon to overrev peak to hit 8100 to 8300 and system retard starts at 8800 RPM?

Unfortunately a days drive away from snow with no time off really test the sleds with no miles
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Old 04-18-2018, 08:43 AM
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Quote:
Originally Posted by ak View Post
Here. RPM, horsepower, torque stock 850.

Thank you.
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Old 04-18-2018, 09:21 AM
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I've always shot for getting a little overrev on the flats (100-150 over peak) and let it work on the hills at 79-8000. No need to be any more precise than that, you have a tachometer that is not perfect, terrain that varies and engine output that varies with temp and altitude. That's the nice thing about a big twin, they have a fairly broad range of usable power.
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Old 04-18-2018, 06:44 PM
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Quote:
Originally Posted by ak View Post
Here. RPM, horsepower, torque stock 850.
That’s a pretty big fat juicy target from 7600 to 8000

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Old 04-19-2018, 10:14 AM
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Wink

Both the owners manual and a sticker on the clutch guard give you the optimum RPM which you can adjust up or down with the clickers on the clutch. The clicker comes on 3, increase the clicker up to the next number as you increase altitude as necessary or decrease the number to reduce RPM as you decrease in altitude.
If you find that your sled over revs at altitude you may need to add pivot weight or buy a clutch kit. Imo.
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Old 05-07-2018, 01:00 AM
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Copied from a clutch website:

The #1 way to keep clutch heat to its lowest is to have correct engine speed when full throttle – 7900. Lower or higher than 7900 the temperatures soar. Both over or underrev, the belt ceases to move across the face of the primary clutch face.
Core Value - Lower heat by lowering part throttle engine speed. So when (example) poking along at 40mph on the hardpack, from this snow area to softer snow area, lower heat will be at 6200 rpms instead of 6700 rpms.
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Old 05-07-2018, 04:21 AM
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Here is a dyno that I've seen that varies slightly from the one previously posted. It's not mine.
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Old 05-07-2018, 10:00 AM
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Old 05-08-2018, 12:11 AM
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Old 05-08-2018, 10:00 AM
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Old 05-08-2018, 04:24 PM
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Old 05-09-2018, 07:55 AM
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Old 05-09-2018, 10:37 AM
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Old 06-06-2018, 09:48 PM
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