Schmidt billet multi-angle helix

[MikeWalters]

Anyone know what angles this helix actually runs?

Any comparison photos?

What helix angle is stock on the 07FX?

thanks guys. Running out of performance ideas/over-rev solutions want to do this next.

 

[UP bushman]

Anyone know what angles this helix actually runs?

Any comparison photos?

What helix angle is stock on the 07FX?

thanks guys. Running out of performance ideas/over-rev solutions want to do this next.

Stock helix angle is 39 degree and the Schmidt helix is a 42 degree. The over rev you need to go with less spring rate to drop rpm.

 

[MikeWalters]

Thanks UP.

By over rev I mean on bottom end/midrange, especially at take off.

Adding 3.1g to each heel put peak rpm right at 11350... perfect.

Spring rate, are you talking primary or secondary? ?

 

[rocklong]

I put schmits stage 2 helix on with ulmers primary kit. At first I just had ulmers kit and that woke the sled up but after I added schmits helix the sled really seem to come to life from midrange to WOT.

 

[UP bushman]

Thanks UP.

By over rev I mean on bottom end/midrange, especially at take off.

Adding 3.1g to each heel put peak rpm right at 11350... perfect.

Spring rate, are you talking primary or secondary? ?

The spring rate on the primary but total force is also an issue. A spring has several components to work properly in the shift out. The preload is for engagement, spring rate is to hold rpm shift as consistant as possible and that equals total force. Aaens tuning book really helps understand all this after reading it several times.

One of the problems I've run into on my MTX is holeshot over rev and load tuning. I can tune the clutch to peak at 11,300 but under load it's 10,800 and holeshot it's 12,100 or rev limiter. The under load issues is not enough spring rate to hold rpm up to 11,300. They other is total force of the primary spring is to low which is what I call the trampoline effect on initial take off. When the main force hits the trampoline it flexes and then returns to a more normal state with less force. Our spring options are some what limited but I need to try the stiffest one and go from there. Clutching info may require a phone call let me know.