Was that on the stock tires? What type of dyno was is? Was it Eddy current? What altiture were you at(if not corrected for altitude can make a HUGE difference) and are the numbers corrected and what correction factor was used SAE or STD ect..... If it wasn't a loaded dyno and the numbers are corrected for sea level that sounds pretty low....70-30% driveline loss should still be in the 48-49 area...35% driveline loss would be about 45...but ;like I listed above there are many many factors involved...and the numbers can only be comepared with the dynos being the same type and useing the same correction factor...

SuziOzark-sheets on an 07 Can-Am I have seen showed a peak of 40.1...have't seen any on an 09..
Also for reference an 08 Brute 750 peaked at 33.2

 

This equals to about a 45-46% loss of HP in the drive train, and average everday car with a traditional automatic looses about 15-20% in drivetrain HP but if you look at a typical big bore ATV with a belt drive tranny I think that these #'s are about right where they are suppost to be. If you takin the fact that they are belt driven with IRS there is multiple places for power loss like this. If you were to have two identical engines one in a Sport quad and a ute I gurantee that the Sport quad will have mor HP at the wheels with a manual tranny, chain dr and solid axle. In short I think it is spot on!

 

midnight, if someone laughs at that, then they aren't anyone to associate with because they have no clue what they are talking about.

500HO's had 36 at the crank
550 has 40 at the crank
500HO EFI is 38
800 is 48
800HO 52
850 69.???..........70

That is as close as I can remember from the carb numbers.

I still think it should be higher than 38, but I must be wrong. The dyno #'s are usually pretty close.

 

<div class="FTQUOTE"><begin quote>Originally posted by: DODGE57HEMI

This equals to about a 45-46% loss of HP in the drive train, and average everday car with a traditional automatic looses about 15-20% in drivetrain HP but if you look at a typical big bore ATV with a belt drive tranny I think that these #'s are about right where they are suppost to be. If you takin the fact that they are belt driven with IRS there is multiple places for power loss like this. If you were to have two identical engines one in a Sport quad and a ute I gurantee that the Sport quad will have mor HP at the wheels with a manual tranny, chain dr and solid axle. In short I think it is spot on!</end quote></div>


Have you seen dyno numbers from a CVT utility ATV? 45-46% loss is HIGH....those numbers are not spot on IMO for a machine that makes 70HP at the crank...
But as I have said dyno numbers are only comparable if the variables are the same..we need more info to judge the numbers...
Do I think the XP is overrated..no ...but I do think that there is an issue with those numbers..

 

<div class="FTQUOTE"><begin quote>Have you seen dyno numbers from a CVT utility ATV? 45-46% loss is HIGH</end quote></div>

They all lose power to the wheels. ATVs that come in both manual and CVT perform the same in power and speed,such as the 400 Eiger/KQ, 500 Vinson and AC 500.

 

<div class="FTQUOTE"><begin quote>Originally posted by: TLC

<div class="FTQUOTE"><begin quote>Have you seen dyno numbers from a CVT utility ATV? 45-46% loss is HIGH</end quote></div>



They all lose power to the wheels. ATVs that come in both manual and CVT perform the same in power and speed,such as the 400 Eiger/KQ, 500 Vinson and AC 500.</end quote></div>

I know..that was a rhetorical question..
Yes of course they all loose power through the driveline...but 45% is alot of loss....I doubt the driveline loss on the XP is 45%....

 

I Just though you though power the lose was higher because of the CVT system itself.

 

<div class="FTQUOTE"><begin quote>Originally posted by: TLC

I Just though you though power the lose was higher because of the CVT system itself.</end quote></div>

Oh ok..no the CVT system if working properly is pretty much a mechanical drive..like a manual clutch..just like you said...

 

<div class="FTQUOTE"><begin quote>Originally posted by: HIGHOCTANE

Was that on the stock tires? What type of dyno was is? Was it Eddy current? What altiture were you at(if not corrected for altitude can make a HUGE difference) and are the numbers corrected and what correction factor was used SAE or STD ect..... If it wasn't a loaded dyno and the numbers are corrected for sea level that sounds pretty low....70-30% driveline loss should still be in the 48-49 area...35% driveline loss would be about 45...but ;like I listed above there are many many factors involved...and the numbers can only be comepared with the dynos being the same type and useing the same correction factor...



SuziOzark-sheets on an 07 Can-Am I have seen showed a peak of 40.1...have't seen any on an 09..

Also for reference an 08 Brute 750 peaked at 33.2</end quote></div>


Tires are 26" Terracross on 212's.
Superflow Dyno.
STP correction factor 1.185
10% load=37.8hp
0% load=38.8hp
peak power was at 6489 rpm
peak torque was at 6321 and 6433 rpm
AFR at peak hp was 12.7

 

is the xp broke in, how many miles on the 850, i know 4 strokers take some time to break in?