Explain Backshifting to me

[tkuss]

I have a question about secondary clutch backshifting. I understand that a steeper helix angle gives you better acceleration as long as is doesnt upshift to fast to overgear and bog the engine.

I believe a shallower helix angle gives you better backshift, correct?. Is this because as you let off the gas the secondary stays in a higher gear ratio for a longer time because it takes a longer time for the secondary to travel down the shallow helix angle?

I would think a steeper helix angle would backshift the secondary into a lower gear ratio faster than a shallow helix angle and would therefore give you a better faster backshift into a lower gear ratio

Or does a good backshift means that as you let off the gas the clutches stay into a higher gear for as long as possible?

I have read the TY tech pages on clutching but cannot just fully understand what exactly makes a clutch backshift well.

 

[Turk]

Backshifting is the ability of the cvt clutch systems ability to kick down in a lower gear & maintain rpm,s when it experiences a load or you get on & off the throttle real quick.
If your on a groomed trail & pull of into deep snow a good backshifting clutch set up will keep rpm,s at an rpm close to peak hp. With a poor backshifting set up(good aceleration tho) when you go from groomed trail to deep snpw rpm,s will fall of dramatically.
The same thing will happen but not as bad if you let off the throttle at wot & hit it again. With a very aggressive clutch set up rpm,s will either take a long time to recover or the sled will fall on it,s face & rpm,s won,t recover(ideal drag race clutch set up).

If you want the best acceleration possible with a cvt transmission you will give up backshift. If you want good backshift you will give up acceleration.
CVT is a compromise.