[craigstumph]

Pro UTV Parts is working on the ultimate Turbo R rock crawling transmission. I can let out that the prototype is in progress and we have a 42.8:1 turns ratio in low range. This is 18% lower than the stock trans or 7.8 turns more that the stock 35 turns. Combine this with 30% portals and you have a whopping 61:1 turn ratio that puts your machine's gearing into rock buggy class. This gives you the ability to run 39"+ tires.

We have also figured out how to retrofit this trans into the older 1000 and Turbo RZRs. The first test will be in our super trick RS1. After breaking the trans in we will attempt running one of the buggy only trails at Sand Hollow. The RS1 was built to run Arrowhead at Sand Hollow. I tried it last month and found out my current 53 turn gearing is too high. I made several obstacles only to be stopped by a smoking belt on one of the tougher ones. The next test will be with the Turbo R trans installed.

The RS1 is bad ass as it is. With the new Turbo R trans we are expecting to have even more capability. I have included two videos of the Soup Bowel at Sand Hollow so you can get an idea of how well the test machine works with the current set up compared to an ultra low gear Turbo S. The Turbo S took 20 minutes to get through. I only know of two other UTVs that have been through the Soup Bowel without a strap or winching.

 

[RZR_Joe]

You made the soup bowl look stupid easy. We'll be out there & Moab the 1st part of June. I'll call you with the dates so we can get together

 

[craigstumph]

You made the soup bowl look stupid easy. We'll be out there & Moab the 1st part of June. I'll call you with the dates so we can get together

I will be there Joe. You are your crew are always fun!

 

[NICETRY]

Working on anything for the Pro R?

 

[Ryan K]

Gonna sell a kit for the funny stuff that rear end does?

 

[craigstumph]

Funny stuff?

 

[Hvlrgr]

Funny stuff?

Assuming he’s talking about the rear steer

 

[craigstumph]

The list of things the Pro R needs for rocks is long. The car is brilliant for going fast, probably the best built so far. For going slow on rock there are several problems.

Cons
1. Trailing arms are too low and hang up.
2. Gearing is not low enough for tough obstacles on 35" or larger tires. It's not too bad with 32s.
3. Front a arms also a bit on the low side, but useable.
4. The front locker is clumsy because it's slow to disengage, but it works.
5. Body is very wide and is damaged easily.
6. 4 Seater wheelbase is too long on breakovers.

Pros
1. Wheel base on the 2 seat is the best yet from Polaris.
2. Power is great.
3. Steering works better than past models.
4. Heavy duty cage and chassis.
5. Heavy duty drive train.
6. Automotive type uni-bearing hubs.
7. Automotive type differentials

The Pro R drive train is the most advanced UTV yet from a manufacturer. I am trying to decide if I want one to go fast for desert and dunes or build it for multi propose use.

 

[Hvlrgr]

Seems like gearing and big ass tires fixes pretty much all if that and it’s built to hold them better than any stock machine to date ….seems like the list is kind of average to me IDK. Glass half full I guess

 

[NICETRY]

Couple of the cons can apply to the Turbo R as well.
Trailing arms definitely need replaced for rock use but even on a 4 seat Pro R I have found them to really only be an issue on more extreme trails like Pritchett Canyon.
Front A-arms I have yet to find them to be an issue and only time I have had them drag on a rock was in Pritchett Canyon.
Front locker is an odd one to put in the cons.

I do have some CT Race Worx trailing arms coming so hopefully that should help out.

I would like to see someone come out with better gearing options for the front and rear diffs besides gearing in the transmission.

 

[craigstumph]

The gearing option is in the testing mode now. The product is called TVM (torque vector multiplier). 25% reduction at the wheel. 3/8" lift and is 4" narrower than than portals. Only 2" wider at each wheel instead of 4". Total width of the test machine on stock wheels with 35" Roxxzillas is 81". Perfect gearing for 35s and extreme wheeling. Top speed is about 75 mph.

 

[Kodak-Pro-R]

The gearing option is in the testing mode now. The product is called TVM (torque vector multiplier). 25% reduction at the wheel. 3/8" lift and is 4" narrower than than portals. Only 2" wider at each wheel instead of 4". Total width of the test machine on stock wheels with 35" Roxxzillas is 81". Perfect gearing for 35s and extreme wheeling. Top speed is about 75 mph.

ETA ? Pictures?

 

[craigstumph]

I will have pics soon. Possibly an install video. I only have test units right now. The production units should be available by June.

 

[craigstumph]

Spy photos. More coming.

 

[Ryan K]

I have wondered why nobody makes something like this, just a planetary reduction I assume. Combine it with some 39”+ tires on a tube chassis and you don’t need a suspension lift or the lift from portals. Of course I want it to be 2:1 reduction.

 

[Kodak-Pro-R]

I’m still try to wrap my head around the 3/8” drop. If it was planetary it would be centered. Something different is going on here. How is the axel shaft not interfering with the new stub.

 

[craigstumph]

We looked at portals for the Pro R and with the added lift and width decided that an 85"+ wide machine would be too wide and tall. The extra 8" width would be hard on the steering geometry and adversely affect the handling. The height would also cause problems because the machine would be tippy. The TVMs keep the machine low for stability, yet gives enough gear for 35"+ tires. The gearing on 35s is awesome for technical rock crawling with about 75 mph top speed. We are mounting 39" MRT tires on our test Pro R next week to see how that works.

 

[littleboss]

Keep us informed. Also more info on the rear steer... Thanks

 

[Kodak-Pro-R]

We looked at portals for the Pro R and with the added lift and width decided that an 85"+ wide machine would be too wide and tall. The extra 8" width would be hard on the steering geometry and adversely affect the handling. The height would also cause problems because the machine would be tippy. The TVMs keep the machine low for stability, yet gives enough gear for 35"+ tires. The gearing on 35s is awesome for technical rock crawling with about 75 mph top speed. We are mounting 39" MRT tires on our test Pro R next week to see how that works.

I agree it would be too wide. 81ish with these makes me nervous. Already getting shut out at 77ish on 35’s. Definitely want to hear how them 39‘s did.

Wait did someone say rear steering? Pro R? Does it involve new trailing arm design to work? I just bought the CAtech arms they are impressive. Make a lockable open rear diff and it would kill.

 

[craigstumph]

I am looking for the lockable open rear diff also. I hope someone makes it soon.