Turbo Vector Clutching

[dirk_03]

Ok I have a yamaha vector motor in a rev chassis. I was having what I thought was problems with the motor or turbo setup. And Now I think I have found out that the clutching was not even close to making it work right.

Here is my current setup.

Primary spring blue/pink/blue
8bu-00's Fully loaded
14.5 rollers
engagement 3400-3600

Team Secondary
44 degree helix
180/300 spring Black/lime Green

Running the doo belt.

What can I do to increase the engagement rpm?

Questions on secondary

1. If i lower the spring rate what will the result be?
2. If I lower the helix degree what will the result be.

I am not a clutching guru. Last year I ran the same setup with the stock yamaha secondary with a Cat green spring and a shockwave helix and it worked perfect but this year I have the engine compression lowered and it is not quite as strong on the bottom end. And I can't run the yamaha secondary yet . . . . . I am working on building a new jackshaft to run the yamaha secondary on the ski doo.

 

[kinger]

What do the clutches look like (smooth, etc), is it not grabbing the belt properly? Why the doo belt? Is that what you set up the motor spacing for? Are they the same diameter? Yamaha belt is much better for boost I would say.

On the rest I would PM turk.

 

[dirk_03]

I am running the doo belt because it is a bit shorter and and I needed to get the motor back as far as possible.

 

[dirk_03]

I talked with Allen Ulmer and he was very helpful to what I wanted to know. It sounds like for every 5 kg of preload I can expect to see aprox 300-400 increase in engagement rpm. I would like to increase 800-1000 rpm in the engagement I think. I would really like to see what that does. I have a green/white/green spring here I can try to see if I like the engagement rpm. I don't think I will care for the finish load that that spring has though. I will order a blue/white/blue if I like where I get my engagement to. That spring should be higher engagement but close to the same finish as the current spring I am using.

It also sounds like I may be able to get away with a little lower helix angle if I decrease the spring a little.

I am going to try to make the sled work with the team clutch for now and I will start working on a new jackshaft for the yamaha clutch again.

 

[rxwarrior]

Why not just put some engagement notches in the weights?

 

[dirk_03]

I have it figured out. It is all clutching related. I put a higher engagement spring in it and it is far better. The only spring I have right now is a green/white/green. So it has a kinda high finish. I am going to order a blue/white/blue and that should get me right where I want to be for the primary and then I will play with the secondary.

I never thought it could be the clutching. But I guess with the changes I made this year i really needed to make changes to the clutching.

 

[kinger]

I dont know all the clutch springs but I have a YWY brand new if you need one.

Good luck hopefully she zings to life!

 

[dirk_03]

I rode the sled yesterday with the heavy spring and it worked ok but I am sure with the lighter finish spring it will grab the belt much harder and pull harder.