Here are the dyno graphs for a stock Summit 154. 2 of the runs are stock clutching from a 2017 vs. stock clutching for a 2018.
P Drive Clutching 2017 vs. 2018
- Thread starter toms
- Start date
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I stared at that for 10 minutes thinking I was missing something
The blue is 2017 stock, green is 2018 stock, and red is 971 ramp.
Skidoo is sure leaving lots of horsepower on the table with their poor clutching.
Toms been doing his homework!
Thank you for taking the time to share it with our readers.
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Thank you for taking the time to share it with our readers.
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I assume that those HP numbers are supposed to have a 1 in front of
Them?
Them?
Thanks for the info Tom. I'm curious, does the SAE numbers from the track dyno have any correction built in? Or are those uncorrected numbers for the ~4,000' your shop is at?
Thanks for sharing. Little disappointing considering there's 160+ at the crank. Assuming 165hp at the crank, and 60hp at the track, that's only 36% efficiency...
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It’s a track dyno so no.
What is a 971 ramp. Sorry I don’t speak clutching.
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https://goodwinperformance.com/product/pdrive-ramps
Click you can see the difference in weights for different ramps.
Stock 2018 ramp 965
Stock 2017 ramp 967
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Tom I see at 50mph the two ramps are about the same hp.. And close to 10 hp over the 17 ramp..When in a climb we mostly see a max speed around 50 mph on stock fourm, or does this graph not cross reference to a hill application..
Be cool to see the tra in comparasion to this p drive primary.. Almost crazy to have such a hp loss to track
Be cool to see the tra in comparasion to this p drive primary.. Almost crazy to have such a hp loss to track
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Weight of ramps..
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Just to clarify, is this a 2017 and a 2018 sled or are all 3 runs done on the same (2017?) machine with just the parts changed?
If it's the same sled, was the gearing and springs changed to match each years setup as well?
If it's the same sled, was the gearing and springs changed to match each years setup as well?
It is a 2017 machine. Just changing primary weights. To keep as many variables the same as possible. At least last I talked with Tom it was a 2017.
Just a good FYI comparison looks like to me.
Just a good FYI comparison looks like to me.
Track speed and ground speed...Good to know which.
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On a dyno they are kinda the same I'd imagine.
With that much power on the table with minor clutch changes, I'd love to see a clutch kit shoot out. Have a few full clutch kits tested from different builders.
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