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Weak 850 or Strong 800s

850 800 Etec Slow 850 Fast 800 Fast Enduro

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#16 MX-Z Man

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Posted 04 December 2019 - 11:56 AM

Reading all these threads on the 850 kinda make me chuckle. The 850 was introduced to give the mountian boys a little grunt at elevation. The p-drive increased the acceleration and made the sled fell faster. You guys have to understand it's only 10 hp. more than the 800 etec. 10 hp. does not make the sled 10 mph faster. As far as speed increase usually rule of thumb add 5 hp. gain 1-2 mph. Don't get caught up in all the magazine propaganda. The G4 was designed to change the riding experience as with the engine position and seating. The 850 was a bonus as it was designed to fit the chassis.   

 

 

The 850 is not a lemon, it is what it is.  Variability is always a factor but in the end I don't subscribe to the theory of miracle sleds and complete dogs.  Machine tolerances are far to precise these days for widespread differences.  In more cases it is environmental conditions, difference in sled setup, track selection, rider ability, the list is endless.  In this case as others have already stated track makes a massive difference and the shift to off trail leaning tracks, i.e. 1.5" lugs and larger just provides more disappointment for on trail use when the effect is scrubbing off top end speed.  Want larger lugs?  Accept that you will trade top end performance for off trail capability.

 

Also, my experience with the 800 is with a 2013 and a 2016.  The 16' was a big improvement in overall performance from the 13'.  Don't ask me what BRP did in the 2015 and later 800's but they all ran so much better than any 800's prior to that.  As has also already been stated the 850 was not designed to deliver a massive top end gain with that additional 10HP.  It was meant to deliver better performance across a wider mid-range band which is where the 800 was not a great performer.  The 850 completely solved the mid-range lag or laziness for lack of a better term.  The G4 chassis brings a lot to the table in the handling department.  It is a big improvement overall and combined with the new 850 motor has been an overwhelming success for Doo with most everyone that has tried them.  Not many dislike them.

 

 

^^^ Nailed it. 


gallery_5_57_615.jpg

The XP was the most fun sled ever made - but I liked my XR more. The 850 takes it to a whole different level. 

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#17 Meat Head

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Posted 04 December 2019 - 12:14 PM

If it's slow make it faster if your bothered by the fact.

#18 SummerSux

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Posted 04 December 2019 - 12:42 PM

Another reason I prefer the 600r.....its always slow lol. 


.......Current sleds.......

 

'17 MXZ-X 850 e-tec 129" coming! No ts skis for me!!

'16 MXZ TNT 1200 (120") Black. Only year for XS 1200 - 120" and it rails!

'07 Mini Rev (not being ridden anymore, bone stock).
 


'16 MXZ-X 1200 Black, Adjustment package (ts skis stink), Ice Ripper, GPS
'16 MXZ-XRS800 Yellow/Silver Adjustment Package) 

​'14 Arctic Cat Turbo 129" TD tune 220/260HP FAST
'14 TNT 900 ACE (Cudney PB80-helix/secondary spring)
'15 MXZ TNT 1200
'15 MXZ-X 800 (yellow/black)
'14 TNT 1200 (Cudney PB80/kit & MBRP header)
'14 MXZ-X 600 e-tec
'13 MXZ 600 ACE (daughters sled)
'10 TNT 1200
'12 MXZ-X 1200
'12 MZX 600 carb
'12 MXZ 600 TNT e-tec
'11 Yamaha Apex (didn't like)
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#19 badactor

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Posted 04 December 2019 - 12:46 PM

Track as mentioned and conditions.
My 2018 850 against my 2016 800 in a few inches of fresh snow on the lake would be close maybe 1 sled length.
On hard pack the 850 will put a few sleds(2-4) on the 800 both having ice ripper tracks, 800 does have a rider weight advantage of about 50 pounds.

The 850 runs cooler than the 800 by 10 degrees across the board and mid range is stronger on the 850.

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#20 GHOSTRIDER

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Posted 04 December 2019 - 01:34 PM

as mentioned earlier, not a big difference in horse power, between a 800 and 850. I had an extremely fast 2015 800 renegade that I still believe is the fastest sled I've ever owned. that sled ran over everything I lined up against.it would run 120 on the speedo every time  you opened it up and it would get there in a hurry. it made other 800's in my group look like 600's.another factor is wind. The 850 sits so high in the front that if there is any headwind at all the xs chassis will have a big advantage



#21 15xrs800etec

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Posted 04 December 2019 - 01:53 PM

I lined up with my 850 xrs last season with 800 xrs and i wish I didn't, i got him out of the hole till about 50 and after that he put bus lengths on me, both were stock

#22 Hemi-ram

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Posted 04 December 2019 - 01:54 PM

2015 must of  have been the golden year for the 800 , my buddies bone stock 2015 tnt beats all 850's in our group , but top end only and usually 3-4 sled lengths behind until 105-110 then he drives away .

I also agree with Ghostrider on the advantage the XS has with the lower chassis design .

But all and all , the 850 is 100 x  more fun to ride and the responsive feeling from the p-drive is extremely addictive .


Edited by Hemi-ram, 04 December 2019 - 01:55 PM.


#23 jeff 800 ho

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Posted 04 December 2019 - 02:15 PM

I've seen vast differences between the 850's performance, stock for stock.  on mine top end was disappointing, I got to 102 on gps (at about 500 miles)  was still pulling slowly,but not enough for me to hold it there. My 04 800ho I topped out @ 107 GPS

 

1 1/4" track  96 1.54 studs 129"

 

Now getting there is a whole lot more fun and faster on the 850

 

I'm at 915 miles now and I figure its Loosen up some more. Have to hit Derby pond to see where it's at now. Just don't expect it to be a lot different...we'll see



#24 ultrazls1

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Posted 04 December 2019 - 02:28 PM

I guess not much difference between an 800 H.O. and an 800 r or etec than either. The old ho is 145 hp compared to 150-155 hp R and etec. But yet people talk like an 800 etec is in another world to an old HO. Which I never thought was the case anyways.

#25 Gin la pine

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Posted 04 December 2019 - 03:18 PM

I've seen vast differences between the 850's performance, stock for stock.  on mine top end was disappointing, I got to 102 on gps (at about 500 miles)  was still pulling slowly,but not enough for me to hold it there. My 04 800ho I topped out @ 107 GPS

 

1 1/4" track  96 1.54 studs 129"

 

Now getting there is a whole lot more fun and faster on the 850

 

I'm at 915 miles now and I figure its Loosen up some more. Have to hit Derby pond to see where it's at now. Just don't expect it to be a lot different...we'll see

This...they are all over the place....like some blow belts some dont..... in my quest of having a reliable 850 starting from a belt blower i've gained 2 sled lenght without even aligning it......So if you get one thats off the chart it prolly wont be a performer.....


Edited by Gin la pine, 04 December 2019 - 03:18 PM.


#26 800_XRS

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Posted 04 December 2019 - 03:33 PM

Are you questioning my butt dyno?


When was the last time it was calibrated lol
03 x 600ho
12 xrs 800 etec
15 x 800
16 xrs 800 etec

#27 slw2007

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Posted 04 December 2019 - 04:00 PM

Sounds like it is the track. I did some quick math making some assumptions and the contact area on the 129 1.6 is a good bit more than the 137 1.25. 

 

The enduro walks away from it from a dig or from a roll. Even in 1 foot of crusty powder the 137 1.25 800 pulls away from the 129 1.6 850. I'm thinking the enduro is just a performer and the 850 is on the slow side. Just a disappointment that it gets spanked so bad.

 

FYI the 850 isn't my sled it's my uncles so I'm not that butt hurt hahahah


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#28 ultrazls1

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Posted 04 December 2019 - 04:15 PM

Modified with exhaust and timing. Geared. Studs. 800 etec: still loses to a stock 850 without even studs in this video

https://m.youtube.co...h?v=Q5DjU9hHl24

#29 72bu

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Posted 04 December 2019 - 05:10 PM


I run my 850 against whoever is riding my '11, 800 every chance I get. The 850 will put 2 sleds on the 800 out of the hole or on a a role up to 70 mph and it stays like that until someone lets off. On a role above 70mph the 850 will get a half to one sled jump then hold there till the end.
The 800 etec was always a good runner in my book. Miy sled has the SC5 rear suspension which is lighter and I think a faster skid than the R- motion rear suspension so that's an advantage for the 800. The 850 accelerates so hard there's no way I'd give it up for any other sled.
Although, I haven't tried the 600r yet.

#30 NB-REV800X

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Posted 04 December 2019 - 05:16 PM

Sounds you like you guys some dud 8 hundo's,  There's 850's beating Sidewinders in 660ft right out of the box. 







Also tagged with one or more of these keywords: 850, 800, Etec, Slow 850, Fast 800, Fast Enduro

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