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Those are great #'s. Anyone care to guess the % of drive train loss? I'm guessing that the belt that the CVT uses would soak up some energy. Even if it was a 14% (Automotive standard for a car with AT and IRS.) drive train loss, that would put the power at the crankshaft at ~36hp. Well over the 32hp number Polaris advertises. Provided that the dynometer is accurate, of course.
 

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I was wondering why no power loss at the rear wheel . 32 at the crank and 31.6 at the rear wheel ? The razor 570 has 35 on the Dyno.
 

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Maybe one reason..... Scoundrel posted that the axles come directly out of the tranny, no other gear box involved, so maybe that saves some power loss.

Maybe Polaris posted ACE's hp based on RWHP ? Would be odd, I know.
 

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If that is true the Ace would have a better power to weight than the 570 . Do any other Polaris models have the axels come directly out of the tranny ?
 

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At about the last 20 seconds. Hard to say how hard he was on it and how the start went, looks like he let up......

 

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I know this is an old thread but I was just wondering If an actual dyno graph was ever posted. I found hmf's dyno of the Ace and it seems much more similar to your original dyno run. It's on a mustang dyno which generally reads lower than for example a dynojet, but I was just curious what torque you read. View attachment 1246
 

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If that is true the Ace would have a better power to weight than the 570 . Do any other Polaris models have the axels come directly out of the tranny ?
Yes, most of them come directly out of the transaxle with a few exceptions, the Sportsman XP 550 and 850 and the 6x6 models and probably some others.

The Ace runs really well for 327cc, but so does the 570. As far as performance difference between the two you can basically figure the horsepower ratings that Polaris puts out vs the weights of the different vehicles and that is about where they will run in a race. The 327 is not as quick or as fast as the 570. There are differences in vehicles in that sometimes you see one that is a dog and one that is really quick, but most of the time the higher hp/weight ratio will win out and it would take real dog of a 570 to lose to a really good running 327 of equal weight.

All of the ProStar series of engines from the 327 to the 1000 use the same basic design principles in the engines and basically the same transmission so there is no advantage to the 327 there.

I think that that last dyno graph that shows 25 HP is the one that will prove to be more accurate as we see more tests in the future.
 
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