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 Installing RacerTechs Dual Rate springs!

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Mud-and-Guts
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PostSubject: Installing RacerTechs Dual Rate springs!   Installing RacerTechs Dual Rate springs! EmptySat Feb 21, 2015 11:43 am

Right after purchasing my 2015 RZR 900S I called Andy with Racertech looking for a solution to the stock springs but found he did not have a new S in house yet and did not know when he would get one in so we got together and made my bike the first test bike to find the ultimate spring package for the 2015 RZR 900S.  First I pulled my shocks and took a few measurements for Andy which he used to find the appropriate size springs and adapters for the new shocks, then a couple weeks  later I received my first shipment of springs. On the first shipment I received various springs in various weights totaling about 20 springs. I tried all of these on the  front and back but even though they where almost all better than stock I felt we could do better so I called Andy and placed the order for a few more springs. On the second and third run of springs I received several more springs in various weights, After putting all these springs through my tests I felt we where getting somewhere so I started putting more time on each set trying to get the absolute best feel for each set when comparing them to each other. When we finally decided I had the absolute best setup I decided to reinstall the stock springs so I could give them a good comparison to the RacerTech springs.


The front stock springs feel stiff when riding at speeds but they are actually quite soft, they feel stiff because they bottom out really easy and in most of my tests they seemed to stay bottomed out. The stock rear tender springs are real soft and if you put many miles on the machine with them on they will wear the threads off the shocks where they rub. I put very few miles on my bike with the stock tender springs and I still found damaged threads on my shocks, mine where not completely gone but they where to the point I wouldn't want to trust them. The stock lower rear springs on the other hand are extremely stiff which when combined with the stock tenders makes for a loose rear suspension and a rough ride at the same time.

In all my testing I did high speed runs in both fairly smooth trails and high speed riding including some high speed runs through a rough creek bed with 6-8" rocks, I tested in slow off camber rock climbs,  I tested in some whoops, and in all my testing the RacerTech springs proved far superior to the stock springs. Honestly when I first picked up the new RZR I felt it handled good and although a little loose it even rode pretty good but after running the RacerTech springs I found the stock springs where much worse than I had originally thought and now I could never go back.

In all my testing I tested the stock springs with the stock preload settings, I tested the RacerTech springs with their recommended 1/4" preload, and I had the clickers in the neutral position. You might ask why so little preload on the RacerTech springs when the stock springs had so much preload? Well to make a long winded explanation short in theory the less preload required the better the over all ride. On these shocks I also found they do not like preload, especially up front. Have you added a little preload to the stock springs to compensate for sagging stock springs or to increase ground clearance? Ever noticed a quick thud when the front tires leave the ground and the front shock extends fully? The excess preload and the stock valving is what causes this violent rebound, If you ride slow you may never notice this but if you ride aggressive you will notice this if you have not already. Although the shocks could use re-valving With the 1/4" preload of the RacerTech springs the rebound is not a big issue.

All along Andy told me to work on two sets of springs a medium set and a heavy set and although I feel the medium set will fit the bill for basically everyone they will have a heavy rate set just in case you need the heavier springs. Now with either of these sets you can expect a better ride than stock and you  can expect a little more ground clearance. On these kits we wanted to keep the RZR close to stock height but to achieve efficient  bottom out control and the smooth ride we where looking for we ended up an inch or so taller front and rear. On my personal bike I opted for 1/4" preload up front and more like 3/8"-1/2" in the rear, this yields for me about 1/2" rake from front to rear. If you want the 1" rake from front to rear the 1/4" preload should work for you.

In conclusion if you want a better handling RZR this is an excellent way to do it and no matter which setup you choose, the medium rate or heavy rate springs I feel you will not be disappointed!




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kscfire
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Installing RacerTechs Dual Rate springs! Empty
PostSubject: Re: Installing RacerTechs Dual Rate springs!   Installing RacerTechs Dual Rate springs! EmptySat Feb 21, 2015 1:29 pm

Nice write up. I have some of Racer Tech's spring ordered and were shipped yesterday for my 900XP. With all the add-ons I've put on I was seeing some squat even with the pre-loads turned up. I'm looking forward to installing them soon. I may drop you a PM if I run into any set-up questions, if that's ok?
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Mud-and-Guts
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PostSubject: Re: Installing RacerTechs Dual Rate springs!   Installing RacerTechs Dual Rate springs! EmptySat Feb 21, 2015 2:18 pm

Thank you and No problem brother, ask away and I will answer what I can. I haven't had an xp but I had the RacerTechs on both my 800 and 900 S.. They made a big difference on both my bikes.

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oldmustangjunkie
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PostSubject: Re: Installing RacerTechs Dual Rate springs!   Installing RacerTechs Dual Rate springs! EmptySun Feb 22, 2015 1:52 pm

Those aren't dual rate springs. There is no crossover nut. What you have is a main spring and a tender spring like the rear on a XP. Buy a set of crossover nuts and you'll be surprised how much better it will ride. I'll look for a link later that explains everything. I've been doing shock rebuilds on some XP and converting them to true dual rate. You'd be amazed how well they ride compared to stock.
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Mud-and-Guts
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PostSubject: Re: Installing RacerTechs Dual Rate springs!   Installing RacerTechs Dual Rate springs! EmptyMon Feb 23, 2015 12:04 am

These are designed so the top spring fully compress's so you don't need the cross over nut. From my under standing all the cross over nut does is cause the lower main spring to become a factor sooner or later depending on how it is adjusted, it would be cool to have that adjustment but I don't know if it would actually help with this setup. I have seen a couple shocks with these nuts that are adjusted so only an inch or so of the upper spring is being used and personally it looks like that isn't much better than a single rate. I could see it helping in certain conditions but honestly these uppers are only 4" springs so if you start cutting them down to 1-2" it looks like the ride would get considerably stiffer? I have seen some dual rate sets that include a 6"-8" upper spring where I could see this making a big improvement over no cross over but personally I don't see why they don't go with a longer lower spring and shorter upper spring so the cross over has less effect.

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My ride: 2015 RZR S 900! Pearl Black

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oldmustangjunkie
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PostSubject: Re: Installing RacerTechs Dual Rate springs!   Installing RacerTechs Dual Rate springs! EmptyMon Feb 23, 2015 8:20 pm

Here's a great quick and dirty explanation of what is and isn't a dual rate setup. I can say with 100% certainty that a true dual rate will out perform any other setup on both ride and handling.
http://shocktherapyst.com/dual-rate-spring/
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RIDERED
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Installing RacerTechs Dual Rate springs! Empty
PostSubject: Re: Installing RacerTechs Dual Rate springs!   Installing RacerTechs Dual Rate springs! EmptyWed Mar 11, 2015 7:20 pm

oldmustangjunkie wrote:
 
http://shocktherapyst.com/dual-rate-spring/

Awesome info !!!

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LAGER570
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PostSubject: Re: Installing RacerTechs Dual Rate springs!   Installing RacerTechs Dual Rate springs! EmptyWed Jul 08, 2015 10:08 am

I just ordered Racer Tech dual rate springs for my 2015 Rzr 900S and can't wait till they get here. Last week out riding I notice the rear end was sagging very low, alot lower then ever before. I have a little over 600miles on it and that's rediclous the stock polaris spring is getting wore out already. Did you gain any ground clearance with adding the RT dual rate medium springs? What do you have your preload and clicks set at on them so I have an idea of where to start. Is there any other tips I need to know about when installing the springs? I am def going to grease the shock bushing while I have it off.
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PostSubject: Re: Installing RacerTechs Dual Rate springs!   Installing RacerTechs Dual Rate springs! EmptyWed Jul 08, 2015 6:43 pm

Yes the springs added 2" ground clearance up front and 1" out back with 1/4" preload. They springs are designed to allow a 1" rake from front to rear but personally I like a close to level ride so I upped the rear preload to 3/4"-1". Install is real easy, it is easier with a speed wrench on the rear top bolt. I used two wrenches on the rear top bolt but every where else I got a ratchet/socket on one side.

With my 29" Dirt Commanders and these springs I have right at 14" GC. On the shocks you might want to loosen the rears a couple clicks and possibly tighten the fronts a couple clicks.

On my shocks I am working with William Yokley trying to get the valving dialed in. The valving on the front shocks have way to fast a preload which is the most noticeable and are to stiff on the rear. William has my front shocks dialed in but we are going to loosen the rears a little more. Hopefully have it dialed in real soon.

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My ride: 2015 RZR S 900! Pearl Black

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LAGER570
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PostSubject: Re: Installing RacerTechs Dual Rate springs!   Installing RacerTechs Dual Rate springs! EmptyWed Jul 08, 2015 8:23 pm

Awsome can't wait to get them and install them. Did you see kind of loss of power going with the 29" dirt commanders rather than the 27's? I am thinking about jumping up to the 29's with a set of method beadlocks. How do they compare to the 27s?
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PostSubject: Re: Installing RacerTechs Dual Rate springs!   Installing RacerTechs Dual Rate springs! EmptyWed Jul 08, 2015 10:20 pm

The 29" are 2" inch taller and yield 1" more ground clearance, they are noticeably bigger power wise but it still has plenty of power. The 29" go better, I can give it more throttle now where before it would just spin the tires now it will bite and go.

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My ride: 2015 RZR S 900! Pearl Black

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PostSubject: Re: Installing RacerTechs Dual Rate springs!   Installing RacerTechs Dual Rate springs! EmptyWed Jul 08, 2015 10:27 pm

Good to hear, thanks alot. Did ya think about putting a full system exhaust or Bikeman Performace tuner on your rzr yet? I was tossing the ideas are but not really sure.
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PostSubject: Re: Installing RacerTechs Dual Rate springs!   Installing RacerTechs Dual Rate springs! EmptyWed Jul 08, 2015 10:39 pm

I got exhaust ordered, going with an HMF full system. I normally don't due exhaust due to noise but they claim 88 decibels compared to 84 stock. Not sure how much difference that makes. And they claim 3hp gain. And yes I have considered the tuner and probably will end up with one. I don't like the throttle governed, when I put the pedal down I like for it to go down. lol

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My ride: 2015 RZR S 900! Pearl Black

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LAGER570
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PostSubject: Re: Installing RacerTechs Dual Rate springs!   Installing RacerTechs Dual Rate springs! EmptyWed Jul 08, 2015 11:53 pm

Sounds like a good idea. Did ya watch the video of bikemans performance tuner for the 900s. At full throttle the throttle body opens 100% unlike stock it only opens 70% with the pedal to floor. 
https://m.youtube.com/watch?v=52jXvjigad0
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PostSubject: Re: Installing RacerTechs Dual Rate springs!   Installing RacerTechs Dual Rate springs! EmptyThu Sep 10, 2015 9:25 pm

I did pick up the BMP tuner a few weeks ago. Last weekend I finally got to try it out by Racing a stock 900S and I got to say the tuner makes a noticeable difference! With my setup 30" QBT446 tires, HMF full exhaust, QuadBoss 27-28" tire clutch kit, and BMP tuner 0-30 was real close but the stock RZR pulled me a foot or two but by 35mph we where nose to nose and by 65 I had him by two + lengths. By 70mph he was way back. My RPM's are still a little low (7800)so I ordered a heavier secondary spring to hopefully get the revs up a little for a better pull from 0 all the way up! I want to start pulling away from the hammer down. lol

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My ride: 2015 RZR S 900! Pearl Black

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