Carl's 900 is running awesome

[assault11]

Ive got 900 miles on mine now. It's completely turn key, no tuning required, just install the kit and go. I had some issues earlier in the year but that was my fault. Pistons and cylinders still look awesome. No det issues at all. I'm running straight pump gas, even starting out in revy at 1000 feet with no issues. It pulls my three inch track really good. Will hopefully have 1200-1300 miles by the end of the season

 

[Dizzle]

Has anyone seen a video of this setup vs. a stock one?

Does the 900 have mostly low end torque over the stock 800 or is it noticeable on top too?

 

[Scott]

Has anyone seen a video of this setup vs. a stock one?

Does the 900 have mostly low end torque over the stock 800 or is it noticeable on top too?

The one that I rode in June last year was REALLY fun to ride. It pulled REALLY well. Kept pulling hard on the top end too. Was at 9500 feet at Cascade, Idaho.

 

[Jimb]

How many gram weights are you pulling and what rpm?

 

[Kcjepperson]

That's the best question ever? I think it needs to be followed by what spring in your primary, what spring in your driven, what helix, what gearing do you have, what track are you running, how much does the rider weigh, what's your riding style, what altitude do you ride at, did you have a muff pot chefboyardee lunch, what's your graphic kit, do you have the +25 horsepower snow flap. There are so many variables that go into what weights and rpms are you pulling.

Sounds like the carls kit is running good though. I would like to ride with one next year and see how comparable they are to the par910. Not in a my 910 vs your 900 way just to see how they compare. I think a lot of us that have both kits are very happy with the motors. I know I am

 

[Kcjepperson]

Assault not directing all those questions to you, don't really care what you are running for weights and rpms as long as your are happy with your sled. But you know if you say 66 grams at 8250 rpms. Some guy will get on here and say hell my stock 600 pulls 66 grams at 8300 rpms all day long in 8 feet of powder

 

[die hard poo]

I just wish someone would demonstrate a side by side comparison of ANY of the big bores for the pro line up to the same year pro and track size and do a comparison race. This will give the customer an indication if the cost of the modification is worth the gain... Is that too much to ask? I agree with Kc that there a lot of variables in setup, but a good ol drag race is hard to dispute! Seeing is believing!

 

[assault11]

I'll run with a turbo at 6 pounds. 4 grams heavier than a stocker.

 

[Kcjepperson]

Right on, I can hang with the turbos for the first 1000ish feet then they smoke me, not really a competition with them on the top end. But I ride at 8000+ feet starting and usually above 10,000 ft for 80 percent of the day so I am sure my top end loses quite a bit with elevation. What elevation are you running at?

 

[Blown Motor]

Not that this answers many questions, in fact it just proves that setups are so variable that it is a seat of the pants answer. But we rode Smith Fork, South of Afton WY the week before the Hillclimbs with these setups.

2013 PRO RMK
Silber Turbo @ 10 Lbs.
163 x 3"
Stock Skid with ZBroz

2013 PRO RMK
HPS Can
Timbersled Skid with FOX
Stock 163 Track

2013 Arctic Cat BDX Pro Lite
900 Big Bore
Lightweight Suspension Components

2013 PRO RMK
Carls 900 BB
Stock Skid and 163 Track


Im not really a drag race guy, but for giggles we compared one day down there. We were at about 9k Ft. 18" of Fresh and it was 24 Degrees or so. The Big Bores and the stocker took off dead even for the first 100 ft. I would assume the Timbersled rear skid made the stocker hook up so well it kept up, after that it fell way behind. It is my Turbo sled, and the bottom end even though it isn't much of a lag took a second to spool. I caught them at what I would say a couple hundred feet, and we pulled pretty even for a couple hundred yards before the boost started to walk away from them. In my opinion though, I was VERY impressed with both the Big Bores. They both had great bottom end and pulled hard for longer than I expected. In my opinion I would probably rather have the BB here at home in Northern Idaho rather than a Turbo, but boost is sure hard to get away from. But the bottom end of the BB's is hard to touch, i will go out on a limb and say it is not achievable on a 2 Stroke. But this is just what I saw on this one day, one location, with different setups.

 

[Kcjepperson]

I must clarify the turbos I was racing were running much more that 6-10 of boost. I really really enjoy my bottom and mod range and probably after next weeks change up the top end will pull just a little bit harder

 

[wellfed777]

Kc
sounds like your 910 is running strong what all did you do to it to get it
working good ?

 

[Jimb]

I think it needs to be followed by what spring in your primary, what spring in your driven, what helix, what gearing do you have,

Yup that would be nice to know too from the op you donkey.

 

[Kcjepperson]

I have messed around with the vipec a lot, from fuel, altitude, air intake, etc etc. that software is pretty amazing, you can compensate for just about anything to get your sled to run as good as possible from sea level to 12,000 or -30 degrees to 50 degrees over. It will automatically calibrate those variables and many more to keep the afr in optimal burn. I have had a lot of good conversations with Bryce at turbo performance about some other things you can do. I am still just breaking the tip of the ice berg with the vipec. It will be a long summer now that the sled just keeps better and better.
Also The tri city polaris boys and I have tried about every combination of weights spring helix imaginable just tinkering getting the sled to perform how I like. I am not a drag racer at all. I am easily in the trees 90 percent of the time I am riding. The pro chassis makes it so easy to feel comfortable at any line you dare challenge. I have my sled setup to have t a lot of snap in the bottom and mid range. I think I still have some more power at the top end that I haven't tapped into yet, but except for maybe 4-5 quick races up some hill I haven't really needed it. I have a couple summer project i want to do to the sled.

Sorry to derail the carls 900 thread not my intention at all. Just trying to answer the question.

 

[assault11]

The nice thing about Carls setup is there is absolutely no tuning required. You get on it and ride it. I'm not the type of guy that wants to sit there and try to tune my sled. I want to ride. And I'm sure I'm not the only one

 

[Kcjepperson]

I agree tuning is not for everyone. I actually enjoy it and like having the capabilities/option to tune. Be able to change things. I am sure carls set there sleds up on the safe side of any tune so they can have good reliability. My 910 ran quite well, probably on the safe side of tuning, when I picked it up and I probably would of been more than happy with it if I wasn't able to fine tune some of those things. But being able to fine tune all these elements has made a noticeable difference in the performance. Also the knowledge I have gained from being able to do it will just help me on the next sled. There are plus and minus to all of it. Sometimes, I am content with how it runs for a weekend. Then I do a little research, ask some question, and want to try those changes. Being able to tune and change things make it's great. Some times the changes help sometimes they don't and I go back to the way it was. The vipec software is pretty cool, I don't have to rely on the seat of my pants to see if the change affects the sled positively or in a negative way, the numbers don't lie.. And I am glad I have the option to change things when I want to and not have to run my sled back and forth to a dealer every time I want something done. But like you said assault some guys just want to get on and ride. I Was one of those guys, but after seeing how many things can affect the performance of the sled. I glad I can adjust thing, as I want to.

 

[Jimb]

For clarification of my question too... I'm deciding between a big bore or a turbo for next year. Never saw any big bores where I ride but lots of turbos.

 

[Kcjepperson]

I think it would be interesting to put a vipec on a carls 900 and see if you can get anymore gains?

 

[Scott]

For clarification of my question too... I'm deciding between a big bore or a turbo for next year. Never saw any big bores where I ride but lots of turbos.

When the turbo guys are changing exhaust doughnuts or reeds in the trailer or on the hill, you are busy booning in the trees or carving circles around them with more bottom end and torque than them. LOL.

 

[Kcjepperson]

Jimb,

I am sure you have seen us around. We just don't have the cool intake cut through the side of our hood, or the sound of the waste gate chirping when we left off the throttle. That's the best part of having a bb, know one knows what you have under the hood, could be stock, could me a lightly modded, could be a doo motor in a poo.
I am 100 percent happy with my choice of the bb, don't get me wrong having a turbo pushing 15-20 pounds of boost and flying up the hill would be a blast, but I love playing in the trees, and I ride a lot with my family and soon to be new riding partner next year (2 year old son) so the turbo is something that would not really benefit my riding style/company right now.