Testing was done on my heavily modified rig…it is set up for desert racing, and weighs 1850 lbs with half a tank of fuel…spare tire, parts & tools, etc. Running on 30x10x14 Motocrawlers.
The motor is a fully built Sparks 1110 naturally aspirated motor with pump gas friendly 11.5 compression.
Bottom line….I think this is one of the best performance mods you can do to your RZR!
It definitely works better with a re-flashed ECM which raises the rev limiter.
Initially my RZR was running 65-66 mph at the 500 foot mark, with a top speed of 80-81 mph on gps at 8450-8500 rpm. This was using a dirty dog clutch setup.
Now with boondocker’s clutch setup my RZR is running 70-71 mph at the 500 foot mark, with a top speed of 77-78 mph at 8750-8800 rpm…with top speed coming much sooner in my steady uphill, .5 mile, test section of road
The rip-tied clutch can be geared differently depending on which belt you use…with the arctic cat belt being the normal one delivered with at about 25% under driven. A narrower belt can be used which brings the gearing back to about 5% overdriven. Boondocker is working on a proprietary belt which is somewhere in between. The arctic cat belt can be had online for about $50
75% of my riding is done on technical trails. Also observing my average speed when going to the Oregon dunes…I noticed that it was between 30 and 60 mph. So sacrificing some top end for much greater acceleration seemed like a good deal.
Seat of the pants acceleration differences are amazing between this setup and stock!
I elected to go with boondocker’s somewhat pricey enclosed cover due to the very muddy and dirty conditions I mostly ride in. The down side to this cover is that the secondary must be removed in order to change belts….something that I initially dreaded…but have found out that since it is splined…it is quite easy and quick. I can do a complete belt change in under 10 minutes. When using the open cover that is provided with the kit, belt changes can be accomplished without removing anything but the belt. I have checked to see if the Fuel Customs cover will work with this setup….and it will not.
Another nice feature of the TIED secondary is the ability to use the treaded tool to spread the secondary for belt changes, and the ability to set initial belt tension.
Talking about clutch engagement, there is an aluminum spacer installed under the primary clutch spring that starts moving the car at about 2800 rpm…and talk about smooth…wow!
I found this high engagement point to be a little too high for my liking…but might be better on a standard bore motor which has less torque than my 1110 motor.
I removed the aluminum spacer which brought clutch engagement down to a modest 1800 rpm…so it starts barely moving the car just above my 1200 rpm idle. The clutch now works so smoothly, that it feels like the automatic transmission on a car!
For comparison sake…my 1110 pump gas motor makes approximately 145-147 hp at the crank according to Sparks. A couple of weeks ago I had the opportunity to race an XPT on the beach in Oregon. This was using the stock clutch with the dirty dog clutch setup. I was able to just barely out accelerate him in a best of 3 out of 3 races…by between .5 and one car length in the bottom and midrange…but consistently pulled him on the top end by quite a bit. My car was doing 79-80 on GPS that day, and I GPSed him at 73-74 mph on the sand. To be fair…I was using STU paddles, and he was on stock tires.
An XPT with a reflash is going to be able to beat me.
Now with the Rip-Tied clutch setup…I could extremely out accelerate a stock XPT…and will have to see how we do in a race…time will tell.
If I get discouraged…I will have to put a boondocker turbo on my 1110…but I sure like the reliability of my NA motor. 3000 miles on it, and it is running like a top, and hasn’t burned an ounce of oil.
When doing one of the desert races, or the KOH race next year, I will probably use the narrower belt in order to get some more top speed. The dry lake beds are some of the only opportunities to pass.
Overall…I love this clutch setup…and think it is one of the best mods one can make to the RZR.
Chris
Bottom Line Racing
