858 on the dyno

[Vern]

At Dynotec, 167hp around 7800hp.

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[turboless terry]

At Dynotec, 167hp around 7800hp.

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That means it is in the mix, which i already knew it was from riding it.

 

[Chewy22]

Here is the full sheet. 800 was 152-154. But I can’t remember at what rpm was peak.

 

[shattuck]

That means it is in the mix, which i already knew it was from riding it.

What’s it like compared to 9R bottom end? I’m assuming top end will be the same or better then 9R I don’t think the 9R top end feels any better then the 850

 

[turboless terry]

What’s it like compared to 9R bottom end? I’m assuming top end will be the same or better then 9R I don’t think the 9R top end feels any better then the 850

I think it pulls harder all the way through but i don't think it revs as quick right out of the hole but not positive. Does not sign off on top like 800

 

[zl5600]

I think it pulls harder all the way through but i don't think it revs as quick right out of the hole but not positive. Does not sign off on top like 800

New crank on production models.

 

[NHRoadking]

Reasonable numbers for the Cat.

 

[hansenmac]

40 more than the 600 will feel awesome. but should lean it out and rev it up so its a piston eating rod breaking nightmare but man would it sell if the dyno said 175.

 

[clutch]

The 600 on the same dyno was 122. So basically 45 more. The 9r made roughly the same or a little less until it had several break in miles on it. Then it was like 170. Same dyno

 

[boondocker97]

Even with 6hrs on it I don't think I would consider that broke in. I bet it picks up a couple by the 500 mile mark.

 

[Old & slow]

I was told by Andy Bevis that the 858 made more power @4000 miles than it did @400 during EPA testing. He didn’t say how much more just more.

 

[MTsled3]

The 600 on the same dyno was 122. So basically 45 more. The 9r made roughly the same or a little less until it had several break in miles on it. Then it was like 170. Same dyno

You wouldn't happen to have access to the dyno chart for the 9r, would you? It would be good to compare powerband of the 9r vs. 858, and even both 850s too.

 

[Readymedic]

Every dyno is different. From my experience with Dynotec, they have always had lower #s with just about any sled. Too many factors involving elevation.

 

[koolaid]

Are they calling the 858 a Ctec2 engine? Same injection oil as the 800's?

 

[Mafesto]

Are they calling the 858 a Ctec2 engine? Same injection oil as the 800's?

Yes, same oil

 

[Clark42]

Reasonable numbers for the Cat.

Is that gonna be enough for the corn fields of New Hampshire?

 

[clutch]

The dyno chart is basically a mirror image with the edge to cat for 3-4 hp at certain rpm ranges until the cat peaks at 7800. Then the 9r keeps revving and peaks at 8300-8400 rpm and 170 hp. I dont know how to attach the chart or I would do it.

 

[BeartoothBaron]

Interesting to see the 858 being torquey and lower-revving - more like the Doo 850. Given the similar bore/stroke to the Polaris 850(840), I would have expected the power curves to be similar. But then I wonder, other than the power drop, if the power curve changes any at elevation. I wish somebody had a dyno at elevation: these near sea level numbers are really kind of worthless for me and most mountain riders (and I know, some of you guys in AK, BC, etc. are down lower). That'd tell you who's tuning for the best power at elevation, and who's just chasing numbers. Anyway, it's good to hear reports that it pulls as hard as any NA motor, and if it's durable, I'd say job well done for Cat. I don't think they need anything else, but that's partly personal. Aftermarket turbo kit sales will be telling as to whether Cat "needs" their own turbo sled.

 

[NHRoadking]

Is that gonna be enough for the corn fields of New Hampshire?

No idea, I don't ride in New Hampshire!

 

[kanedog]

I notice perfect placement of the hp/tq curve. 8000 is rpm perfectly on the backside of the torque curve so when the engine is loaded on a big climb, rpm’s begin to drop, the engine falls into more torque. Nice. So many torque curves make no sense and seem willy nilly. I think this factoid will be part of the secret sauce. Cat sauce that is.
There’s a 10% drop in power in 200rpm, 7950 to 8150rpm so it’s important to be at 8000 on the nose. Aftermarket pipes will give many tuning options and different power bands for your performance needs. Exciting