Polaris RZR XP Turbo/S STM 44-36 Helix
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The helix is the “brain” of the driven clutch and it will respond differently with a change in load to the machine, for example, bigger tires or increasing gross weight to the vehicle. With the 36-42 helix, you will gain more out of your driven clutch and have a quicker backshift compared to the OEM helix while raising your rpms and top speed.
Does not fit 2021 Pro XP
The helix lives within the secondary clutch. The helix helps apply pressure to the CVT drive belt. There are two types of helixes, straight and progressive. Straight helixes will have the same angle cut the whole duration. A progressive helix with have two different cuts for different shift points. Different helixes with more aggressive or less aggressive angles can adjust the pressure on the belt and shift points. If you get too aggressive with the helix angle, and don’t adjust the secondary spring you will cause belt slip. If your rpms are too low, a shallower range helix and/or stiffer secondary spring will raise rpm. This will also provide more squeeze on the belt which is useful if you are experiencing belt slip. Conversely, if your rpms are too high, a steeper range helix and/or softer secondary spring will lower rpm.
testimonials
My car is absolutely insane. LOVE it. Thank you for everything. Zero issues and even in 95 degree ambient it's not over heating dining or anything. This power dining is 100% perfect. Car is a beast. You guys Rock! - Dynomite Turbo Kit
Ernie
Evolution Powersports has a reputation of the utmost quality and attention to detail on every product they design. From within the industry and outside, I have heard nothing but great things about this company and my experience has been the same. If you are looking to make more reliable power this company can get you there. Both customer service and product design are top notch and they stand behind their work!
Blake S
Don’t spend much of your money here unless you want gobs and gobs of reliable power
Collision Vision
I wouldn’t go with another company if you payed me
Ryan L
If you truly want to build your project with the best possible parts available, buy EVO. They not only build with the best materials they test and test to make sure you are getting the performance gains they say you will but that the mods will be safe and keep the reliability of the machine as high as possible. Thanks again to both Jim and Todd. Keep it up guys!
John K
Great customer service!
I have had such a great experience with EVO over the course of a year, I wouldn’t even try going anywhere else. Prices are fair and the performance you receive is unreal!!