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Discussion Starter #1
Hello, I have a '11 XP 900 with a pump gas 995cc Alba Big Bore in it. It's clutched right now using the parts Alba supplies and setup great for the 26" STU paddle tires on it. I intend to use it for some rock crawling and trail riding in addition to just the sand, including running The Rubicon Trail. So I'm considering 30" or 32" tires. I was really interested in your kit to make changes to the clutching to accommodate the different tires easier.

I've been told your setup won't work though because I have the Big Bore. Is that true? Can you set me up with a kit that would work with my Big Bore on both the sand and rock tires with just changes to your weights that can be made easily with the clutch on the car?

Thanks,
TJ
 

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Hello, I have a '11 XP 900 with a pump gas 995cc Alba Big Bore in it. It's clutched right now using the parts Alba supplies and setup great for the 26" STU paddle tires on it. I intend to use it for some rock crawling and trail riding in addition to just the sand, including running The Rubicon Trail. So I'm considering 30" or 32" tires. I was really interested in your kit to make changes to the clutching to accommodate the different tires easier.

I've been told your setup won't work though because I have the Big Bore. Is that true? Can you set me up with a kit that would work with my Big Bore on both the sand and rock tires with just changes to your weights that can be made easily with the clutch on the car?

Thanks,
TJ
Not sure how often Dalton reads this section I will answer with what I think Dalton will answer with, as we just had this discussion and if he reads this he can correct me on it. I am only answering because I don't want you to have to wait on a answer.

He told me there are too many cam profiles out there for the kits to work with and BB kits need a much heavier weight than a stock engine to keep from what we call blowing through the clutch. The heavier weights are to make it shift out quicker or put it in higher gear if you will quicker thus loading up the engine.

So as a general rule they won't work with the BB kits.

Also the calibration between your 26" sand tires on sand will be a much different calibration than the 30" tires. No matter what you do I would surely limit it to the 30" I prefer people limit it to 28" tires as it becomes harder to over come with clutching. If a kit was available for this, these two different tires would also need to swap secondary springs back and forth.

Hope this helps and you didn't mind me answering.

Todd
 

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Hi Tj

Hunterworks has given you good info (thanks Todd, you are correct I'm not here as often as I should be)

To elaborate a bit more it is not that the kit doesnt "fit" or anything, and quite possibly the components here could be used, but it is more important to realize that accurate cvt calibration needs to be tested for each application...and changed any time the following:

- hp change
- required rpm peak changes (long duration camshafts, etc)
- final drive ratio change (including from larger diameter tires)
- rotating mass like heavy tires,
- deep soft terrain, etc

So although the comoponets could maybe be used ...the calibration of those for best efficiency would need thoroughly tested in the exact application............without doing the proper testing it could give you wrong info, and we only sell what has been tested. that way, when someone asks "what happens on this application when we use this tire, etc" ...we can answer with confident, tested results.
...we certainly do not have that test data with your engine, so I'm sure it would be better for you to stick with the tested parts you have from the original vendor.

You dont "guess or assume" anything when it comes to calibration of cvt's.

Sorry to not be more specific in this application

thanks for inquiring.

PS, Todd is correct. If you want to contact Dalton Ind., the best way is probably not a forum (in case we miss it)...it is always better to go [email protected] and we will answer quickly.
Thanks
 

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Discussion Starter #4
A little update:

I put the 30" Mongrels on the car this weekend and ran it in the dirt. I had just put a new belt on and cleaned the clutch sheaves really well with scotch-bright and denatured alcohol and I broke the belt in carefully.

When jumping on the throttle the RPMs would hit around 7,300-7,400 which is of course a bit lower than the 8,200-8,300 it would do on the sand setup (roughly 27"). I ran it out to about 7,600-7,700 RPM which was indicated a bit over 70 MPH, but really over 80 MPH with the 30"s. It was still pulling hard, but the wind noise (we didn't have helmets/headsets on) was getting to be too much.

All-in-all I think I'll leave the clutching alone. In the dunes when you really need the speed/power it's clutched perfect. In the dirt on the 30"s it's not hitting the RPM I'd ideally want, but the Alba 995cc Big Bore still pulls it great and it was way faster than any of the other RZRs I ran with. In a perfect world I'd just have 2 full clutch setups, but for now I can just swap the tires and go.

-TJ
 
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