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Thunder doesn't reveal his rates... But I can tell you it's one the most stout springs I've handled
I put this spring in this weekend and wrapped it at 60. My hands still hurt!! Made my stock sled much more responsive with the stock 35degree helix. I was also wondering how different brand helixes measure out compared to the stock helix. Turk had a post years ago comparing different helixes (he measured them)and they were off by a couple of degrees compared to the stock helix. For example a Bender or Dalton may say 35 but they act much steeper or shallower than the stock helix. I miss Turks clutching posts. He helped me a lot with my RX1, APEX and Nytro.
 
Agree with the different vendors' helixes. Rated angles will be slightly different from each other regardless of how similar they look. This is fact.
 
I knew it wouldn't take long for Mr dalton to chime in. I'm not singling out anyone's brand just pointing out the fact that they're not all same. Testing is a must.
 
I just picked up ulmers stage 2 which is a spring and helix. Comparing helix angles and without knowing ulmers angle (all he told me is its a multi angle, not a reverse).

First pic is the stock 35 with daltons 35/39 reverse next to it.

Second pic is stock 35 with ulmers helix, quite the difference in angles.
 

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No details needed, shallower angles have always work better 4 me. If you remember the old days back on the TY two stroke forums Turk or Srx Majic had tested some roller clutches. The conclusion was after 1:1 shift the clutches become very inefficient and belt tension drops off significantly. Best top speed was achieved with a 32 degree straight helix and heavy secondary spring. So I started testing the theory also and found I could get 5~6 mph more on a shallow helix and stiff spring. I had my SRX over 120 on Radar bone stock motor, killing ZRT 800’s on a wide open lake only clutching. Yea they accelerated faster but with some room I always reeled them in. Even button clutches gain a bit below 40 degrees. I believe I was running a 42/32 helix on a Haulk roller silver secondary spring.

Maybe this heavy orange secondary spring from TP is doing the trick and keeping the belt tighter?? Just my experience with helix angles is all I’m trying to convey.
I also found the same results as you back in the day with 835 SRX running HeelX roller secondary 41/32 stiff spring, motor had plenty of grunt to accelerate and top end was amazing
 
I ordered and installed the big venom kit along with the 33/35 helix and orange secondary spring based on you and Shagmans reports. Thank you for all your hard work. I'm sure I will be very pleased with the results.
I bought the same set up, waiting to give it a try
 


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