QuadBoss Clutch Kit in the "S" - Polaris RZR Forum - RZR Forums.net

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post #1 of 9 Old October 29th, 2013, 06:59 PM Thread Starter
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QuadBoss Clutch Kit in the "S"

Hey guys I see there is a lot of discussion on this and everyone seems to have different ideas of what works and what don't. Anyway earlier in the year I picked up two QuadBoss clutch kits, one for the RZR with 27-28" tires and the other for stock tires. Inside the Box was QuadBoss and EPI stickers and the instructions was EPI. I installed both kits but they did not agree with my bike nor me.. When I say they did not agree with my bike (2013 RZR S LE blue fire) I mean my bike would stumble and miss with wide open throttle from a stand still because (I assume) the engine would rev to fast and the ECU would tell it something was wrong. The launch felt good for about a second before the ECU would shut it down. And when I say it did not agree with me I mean I did not like the high engagement RPM (25-2700rpm). Stock engagement on mine is 15-1700..

Anyway the stock tire kit had a white primary spring, green secondary spring, and 66 weights.
The 27-28" tire kit had a white primary spring, green secondary spring, and 64 weights.

After riding with both these kits for a short time I got to thinking if I could lower the launch RPM me and my machine might like it better so I started doing a little research.. What I found was the Primary spring effects the clutch engagement RPM so I went to EPI and looked through their primary springs and ended up ordering a silver spring to try.. This past weekend I reinstalled the stock tire kit with the substitution of the silver spring instead of the white spring.. What I found made me and my machine smile ! My engagement now is 19-2100rpm and it has a much better feeling launch, the clutch also feels like it engages firmer. I have only rode this a few miles so far and no big down hills so I am still curious as to how it will do on a long trail ride but so far I am very happy. With this setup I can't tell much difference from a 30+mph punch but the low end gain is very noticeable. I think the 64 weights will give a little better accel but I don't know, I will try them and see next time I pull the clutch if I don't change my mind.

Anyway my .02 so far..

2015 RZR S 900 (currently in the process of "Making it Mine")
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post #2 of 9 Old November 2nd, 2013, 09:46 PM
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Re: QuadBoss Clutch Kit in the "S"

Very good post. However, you are not going to notice a big difference with just a 2 gram difference in weight. UNLESS the weights have a different profile from each other. Most of the EPI RZR clutch weights are the "Torquer" series. Which for the most part, have a very aggressive profile that will give you good low end takeoff. Going to a lighter weight with the same profile will increase your rpms and will raise your engagement speed (stall). Another thing too, one of your kits maybe for the 08-09 RZRs that had the Team 3 secondary clutch. They use a completely different Helix setup from your 13 model which uses the "Rapid Reaction" secondary. If I'm correct the Rapid Reaction secondary (10-14 year models) require the use of a much stiffer secondary spring than the Team 3 setup.

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Last edited by PolarMud; November 2nd, 2013 at 09:54 PM.
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post #3 of 9 Old November 3rd, 2013, 03:01 PM Thread Starter
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Re: QuadBoss Clutch Kit in the "S"

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Originally Posted by PolarMud View Post
Very good post. However, you are not going to notice a big difference with just a 2 gram difference in weight. UNLESS the weights have a different profile from each other. Most of the EPI RZR clutch weights are the "Torquer" series. Which for the most part, have a very aggressive profile that will give you good low end takeoff. Going to a lighter weight with the same profile will increase your rpms and will raise your engagement speed (stall). Another thing too, one of your kits maybe for the 08-09 RZRs that had the Team 3 secondary clutch. They use a completely different Helix setup from your 13 model which uses the "Rapid Reaction" secondary. If I'm correct the Rapid Reaction secondary (10-14 year models) require the use of a much stiffer secondary spring than the Team 3 setup.
Both kits I have are suppose to be for the newer clutches.. Only difference between the stock tire kit and the 27-28" big tire kit is the weights.. I tried both kits and couldn't tell much difference between the weights but with the clutch tuned a little better to my liking with the silver spring I am curious to try the lighter weights but I like the setup so good right now I hate to pull it back apart just to experiment.

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post #4 of 9 Old November 3rd, 2013, 06:16 PM
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Re: QuadBoss Clutch Kit in the "S"

If you like how it is now, then I would leave it alone. It just really surprises me that the only difference between the stock tire kit versus the 27-28" kit is just 2 grams of weight. Usually clutch tuners change the secondary spring to a much stiffer one for big tires along with a slight weight and primary spring change. Very interesting.
The one thing I have never understood with EPI, is their obsession with high rpm engagement on a lot of their clutch kits. Anything over 2000 rpms is just too much for me. I have noticed on this forum as well as others, that most people with EPI clutch kits, usually have to buy a different primary spring with less pretension to lower the stall. I'm not trashing EPI at all. I've had a few of their clutch kits and have liked them all, its just the high stall is a little annoying and hard to get use too for most of us.

GForce shock revalve w/ Racertech springs
15HP ECU reflash
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post #5 of 9 Old November 3rd, 2013, 06:31 PM Thread Starter
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Re: QuadBoss Clutch Kit in the "S"

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Originally Posted by PolarMud View Post
If you like how it is now, then I would leave it alone. It just really surprises me that the only difference between the stock tire kit versus the 27-28" kit is just 2 grams of weight. Usually clutch tuners change the secondary spring to a much stiffer one for big tires along with a slight weight and primary spring change. Very interesting.
The one thing I have never understood with EPI, is their obsession with high rpm engagement on a lot of their clutch kits. Anything over 2000 rpms is just too much for me. I have noticed on this forum as well as others, that most people with EPI clutch kits, usually have to buy a different primary spring with less pretension to lower the stall. I'm not trashing EPI at all. I've had a few of their clutch kits and have liked them all, its just the high stall is a little annoying and hard to get use too for most of us.

I totally agree I would have thought there would have been a spring difference but after ordering and receiving both kits I called EPI and was told they where correct and the only difference was the weights. I to felt the stall with the kits was way to high and I cann't see letting the engine run like that all the time.. For high speed trails or deep mud it may not be that bad but for trails like I ride I couldn't handle the high speed engagement..

2015 RZR S 900 (currently in the process of "Making it Mine")
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post #6 of 9 Old November 3rd, 2013, 06:37 PM
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Re: QuadBoss Clutch Kit in the "S"

Yeah I think a lot of mudder guys who race in the mud pits like the high stall to give them a good launch. But that has got to be hard on drivetrain components in the long run. Around 1700 to 2000 rpms is usually good for trail riding or technical riding.

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post #7 of 9 Old November 3rd, 2013, 06:48 PM Thread Starter
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Re: QuadBoss Clutch Kit in the "S"

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Yeah I think a lot of mudder guys who race in the mud pits like the high stall to give them a good launch. But that has got to be hard on drivetrain components in the long run. Around 1700 to 2000 rpms is usually good for trail riding or technical riding.
I agree, stock engagement is pretty good but with the new setup engagement is just a few hundred higher and has a lot better low end launch and it feels like it engages firmer so maybe the belt will last longer. I am getting use to the engagement being a little higher and really like it also, I was looking for 2000 when I ordered the silver spring and got lucky that my engagement is right on with that. I can't wait to get a few good rides on it and see how it performs. I have also heard that the stock springs are like the stock shock springs in that they are cheap and weaken fast but the EPI is suppose to hold their weight better/longer.

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post #8 of 9 Old November 23rd, 2013, 10:51 PM Thread Starter
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Re: QuadBoss Clutch Kit in the "S"

I've got a few more miles on this setup and for the way I ride I love it. It is a lot peppier than stock and launches/lunges quicker with better throttle response. No major improvements up high but down low is awesome.

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post #9 of 9 Old November 23rd, 2013, 11:16 PM
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Re: QuadBoss Clutch Kit in the "S"

Change the secondary to the older style which will give you EBS and it seems to give better low end grunt. I bought one off of eBay that came off of a 08. Guarantee you will like it even better!
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