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  #1  
Old 07-14-2011, 10:44 PM
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Default RMK 800 PRO Mods?

I snow checked a new 800 RMK 163 pro. Sold my turbo four stroke. Want to pull a reliable extra 15-20 hp out of the 800 plus add a small hit of nitrous. What have other owners been doing for mods that work.

Thanks in advance!
Casey
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Old 07-15-2011, 08:31 AM
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Power Addiction Head 13.1 if you are riding 3000-5500 or 13.6 if you spend your time at 5500-up

Clutch Kit from Carl's Cycle Sales in Boise Idaho

Trim your stock 5.1 Polaris track to 2.1"

Do these three simple things and make your PRO outstanding! Stock shocks are seriously wanting as well in all aspects of performance. I did a Fox Evol R front and Evol R with Zero Pro/ Ti spring rear system that is second to nothing that I rode all last season.


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  #3  
Old 07-15-2011, 09:26 AM
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I know the CFI4 had excellent gains with a high compression head and I'm hoping that the CFI2 does the same without deto issues and without the need of race fuel. That could be wishful thinking, but that lightweight chassis would rip with a few more HP.

This is the best sled I've ever had out of the box. Shocks are a little soft though.
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Old 07-15-2011, 10:09 AM
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I had a 1150 cutler before my Nytro turbo and loved that sled more than my t-4 stroke, wondering how peoples experiences are with the big bore kits on the 800. I am riding 2-6500 ft.
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Old 07-15-2011, 11:07 AM
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You could look into slp' s stage 3 kit for the pro, bolt on and gives you an extra 15hp.
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Old 07-15-2011, 10:51 PM
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Default Dynotech research

Join Dynotech reasearch look at the graphs they have done on stock and mod 2011 polaris 800's.
167 hp 106 ft/lbs w/ cyl shim, timming key and pipe.

http://www.dynotechresearch.com/index.htm

Hey KC, I remember you, you were going to sell me a SC for my Nytro, welcome to the club.

Last edited by traveler; 07-15-2011 at 11:05 PM.
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Old 07-16-2011, 10:04 AM
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Quote:
Originally Posted by traveler View Post
Join Dynotech reasearch look at the graphs they have done on stock and mod 2011 polaris 800's.
167 hp 106 ft/lbs w/ cyl shim, timming key and pipe.

http://www.dynotechresearch.com/index.htm

Hey KC, I remember you, you were going to sell me a SC for my Nytro, welcome to the club.
I do remember now. Ya the SC was an adventure that went really wrong really fast, so I took the SC off and put the turbo on. The turbo ripped (340hp) but you just cant have fun boondocking. Time to focus on light weight and agility again. Hope to get to 410-420 lbs dry with my 163 pro and 165-170 hp.
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Old 07-16-2011, 02:32 PM
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Here's another option KC, Power additions 1100 twin w/ lectron carbs, lots of weight savings over fuel inj. system, more than enough power. http://www.poweraddictionracing.com/...products_id=74
http://www.snowestonline.com/forum/s...23#post2730423
if moneys no object, this is the direction I'd go once they get some hours into it.
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Old 07-17-2011, 08:44 PM
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wow, $12,000! I wonder how many will sell. Cool motor, very cool.
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Old 07-17-2011, 10:26 PM
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or as a fuel injected option.....
http://www.snowestonline.com/forum/s...46#post2748746

or the more affordable! porting, head , single pipe and PCV-you can't go wrong with that combo!

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Old 07-18-2011, 09:16 AM
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Quote:
Originally Posted by F-Bomb View Post

Trim your stock 5.1 Polaris track to 2.1"
Why? And how will the track perform in very dry powder?
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Old 07-18-2011, 12:25 PM
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There is no handicap in any type of snow tested heads up versus a bone stock 5.1 irregardless of depth or water content. You do get exponentially higher performance with higher water content or more packed the snow conditions.

The reason for this on this particular vehicle is because the drag from resistance of windage and evacuation space cannot be overcome by the 800's limited HP. IE A balance of pattern, throw, evacuation and windage in use with the amount of power/force available is what propels the vehicle. On this vehicle you get better performance with less drag resistance. To compete in net performance you have to add significant HP to overcome the resistance.

Camoplast (the contracted manufacturer for Polaris) knows this and it's been clearly proven over and over on this application. The problem is the consumer is ignorant and marketing demand drives design. Guys would stuff 3" paddles plus in there if they would rotate at all! Add more HP and more evacuation space to lessen resistance and you'd would have a performance increase but as things stand right now on this application 2.1" is the perfect setup and that is why I coach people to do this. It gives you free performance over your buddies' stock application all day every day.
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  #13  
Old 07-18-2011, 12:29 PM
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Since the timing seems to play such a vital role in the DTR runs... I'm wondering what the results would be with stock exhaust, stock head, no shim BUT adding the timing key and the PC-5?? (no speculation.... just a real world test)
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Old 07-18-2011, 04:36 PM
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So Rob, how much advantage is the cut down 5.1 over just using the competition track?
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Old 07-18-2011, 07:10 PM
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Would there be an advantage to cut a V down the paddles in the center of each row to allow for air evacuation. We used to do that with the old plastic paddles. (WOW that was dating myself)lol. Keep the opinions coming, myself and others are needing opinions. Thanks
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Old 07-18-2011, 07:55 PM
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trim but do you add screws to these tracks also??, did that with my 08 d8 and did lots better than stock
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Old 07-18-2011, 10:13 PM
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Well if you ask Polaris or Camoplast they will tell you the 5.1 is the same and I've always installed stiffening screws on the 5.1. BUT...when the PRO showed up last year studying it directly next to my 09 the track appears stiffer. So I simply trimmed it first but no screws to compare. It throws and feels identical to my old 5.1 with inset screws. Now the two sleds are totally different so you couldn't conclude anything against one another but they stood out similarly in their comparison to other like sleds in testing.

Windage and resistance are huge performance factors. It doesn't take much drag to have a significant effect on performance.

I trimmed a camo extreme on one of my sleds and it was outstanding as well. Once again same chassis situation on both the IQ RAW and the PRO..just not enough room and snort to efficiently spin that mass...as least not as good as the exact same track trimmed to 5.1 and what ever durometer or flex/throw you end up with on the old 5.1 with 1" inset screws or just trimmed on my PRO. Never did a direct comparison on a 5.1 155 versus a camo extreme trimmed (only non trimmed and the cut 5.1 was better). There is a snowest member from the midwest that bought a camo extreme 155 for an IQ and trimmed it...he liked the results or so he said.

I had such a good result from my trimmed stocker 5.1 on the PRO this past season that I consider it a done deal. I"m sure waiting for someone to come along and show me a significantly faster or better performing PRO with any kind of a track or track mod. It's gonna have to be something new because what was offered last year didn't do it.
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Old 07-18-2011, 10:52 PM
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thanks for the info, i know your track mod on my d8 saved my bacon on crusted snow more than once, will trim er and see how it goes
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Old 07-19-2011, 09:22 AM
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Rob -> Did you have to make changes to the Pro stock skid? I ask because the limiter strap is not adjustable (w/o modifications) and the adjustment is mostly in the front shock. I've thought about making your mod to my Pro but the Pro isn't as bad with the 5.1 as the Dragon was. I'm sure some of your variables have something to do with that including weight and the transfer of the rear skid. I'd like to hook up quicker when climbing out of a hole or coming down hills. I might just try it. If it doesn't work, there are a ton of guys selling their 5.1's. If you see my signature, you can see I'm trying to find an old beater 5.1 to experiment with.
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Old 07-19-2011, 09:23 AM
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Quote:
Originally Posted by mountainhorse View Post
Since the timing seems to play such a vital role in the DTR runs... I'm wondering what the results would be with stock exhaust, stock head, no shim BUT adding the timing key and the PC-5?? (no speculation.... just a real world test)
Isn't the timing key relative to the shim?
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Old 07-19-2011, 05:59 PM
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Well you certainly don't have too but I run stock arms and rails with a Fox rear suspension that has an the new 2011 Evol R rear shock and the Fox Zero Pro that Renton Coil Spring loaned me a prototype progressive rate Ti spring to test with. I make my own limiter straps normally after I've had an opportunity to try out a system. Once I got the pre-set tension correct on the Ti spring it turned out to be just right with the factory stock settings on the limiter. I had to search around with the Ti spring settings before I got it just right. Almost removed it and called it a no go but tried a very very loose almost no pre-load setting and BAM magically delicious! Those springs are expensive and they don't just make fifty to try so we were in a stretch but it's exactly what I would recommend for them if they want to go into production as this setup is sweet and very high performance. Fox OK'd the project and helped us with the parameters to attempt. The guess came out great using Fox's initial tensions and length ratios and then getting as close as we could with some of the existing prototype progressive rate Ti springs that RandD had available.

The PRO is so light and balanced that you definately don't get the instant and obvious impact of the track trim like the iq raw in bone stock form. This is another reason why I think there is some funny business going on with the stiffness that everyone is claiming. The PRO track does not seem to lay over and spin nearly as dramatically as the iq raw did. But once I got the combo of the head and the track trim that is when it got really exciting. The stocker at alt is pretty lethargic and I think it's a compression deal. Once we bumped up to 13.6 and had the track trimmed it became a completely new beast. Snap was right there and in all conditions not just packed drag racing. It's cool to hammer it and have the skis pack and hold steady only changing with throttle control not terrain. Probably why this sled rips so good in various conditions. Really good setup and balance. Also note it wasn't like that the entire season. I messed with a bunch of clutching, head, track, and shock setups throughout the season and alot of them weren't all that "special". Tons of rides on a mediocre running sled...but by the end we got it really right and especially in our home stomping grounds.
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Old 07-19-2011, 07:10 PM
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Quote:
Originally Posted by mountainhorse View Post
Since the timing seems to play such a vital role in the DTR runs... I'm wondering what the results would be with stock exhaust, stock head, no shim BUT adding the timing key and the PC-5?? (no speculation.... just a real world test)
I've been wondering the same. Makes sence, do the least expensive/invasive mod 1st.
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Old 07-19-2011, 07:31 PM
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So why does carls use the cat track instead of just cutting the 5.1 especiallyp on the turbo sleds???

Quote:
Originally Posted by F-Bomb View Post
Well if you ask Polaris or Camoplast they will tell you the 5.1 is the same and I've always installed stiffening screws on the 5.1. BUT...when the PRO showed up last year studying it directly next to my 09 the track appears stiffer. So I simply trimmed it first but no screws to compare. It throws and feels identical to my old 5.1 with inset screws. Now the two sleds are totally different so you couldn't conclude anything against one another but they stood out similarly in their comparison to other like sleds in testing.

Windage and resistance are huge performance factors. It doesn't take much drag to have a significant effect on performance.

I trimmed a camo extreme on one of my sleds and it was outstanding as well. Once again same chassis situation on both the IQ RAW and the PRO..just not enough room and snort to efficiently spin that mass...as least not as good as the exact same track trimmed to 5.1 and what ever durometer or flex/throw you end up with on the old 5.1 with 1" inset screws or just trimmed on my PRO. Never did a direct comparison on a 5.1 155 versus a camo extreme trimmed (only non trimmed and the cut 5.1 was better). There is a snowest member from the midwest that bought a camo extreme 155 for an IQ and trimmed it...he liked the results or so he said.

I had such a good result from my trimmed stocker 5.1 on the PRO this past season that I consider it a done deal. I"m sure waiting for someone to come along and show me a significantly faster or better performing PRO with any kind of a track or track mod. It's gonna have to be something new because what was offered last year didn't do it.
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Old 07-20-2011, 08:41 AM
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The PC track is very popular down at Carl's! Obviously Jack feels like that is the superior track system for their setups.
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Old 07-20-2011, 01:37 PM
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