Clutch Kit Reduce Engine Breaking?

[bigsur]

I just installed a Ulmer Clutch kit in my Apex, and it greatly reduced the 4-stroke engine breaking effect. Do the Phazer kits do the same?

 

[ZAKSTANG]

i installed a ulmer spring/weight kit on my phazer and also put a 136 track on....MUCH less engine braking...not sure if it is from the clutch kit or the track or both though...but i like it

 

[rhino_live]

ya it's from the clutch. I still ride a stock track...ulmer clutch kit does reduce engine breaking alot. again i think this is about the best $150 i ever spent on a snowmobile.

 

[Otter]

Heh Rhino what did you end up using for a helix setting with the ulmer clutch kit . I ended up using C-2. A1 my rpms were like 10800

Otter

 

[yzf1999]

It does reduce engine breaking alittle..

 

[RJH]

It seems the clutch kits…..that folks buy on this forum are well thought out.

What would decrease engine breaking – was interesting. The answer would be that the belt is staying high on the faces when you let off.

You would get the same feel….clutch reaction say…if you were going down a hill and let off. The secondary does not feel the load (as the track still turns a bit) and lets the belt stay high.

A bad way (but understandable) to describe it would be ….driving your 4 speed car in 3rd (at a good speed) and letting off the gas. As opposed to - letting off the gas (at a good speed) while driving in 1st.

If the sled can still pull this –then it’s a step in the right direction.

 

[Weapon X]

Isn't the engine braking a result of a good secondary clutch backshifting properly

 

[RJH]

Yes – backshifting alters the leverage by (as you are aware) moving the belt higher on the secondary and lower on the primary…..quickly. A 4/ is more pronounced than a 2/.

Yamaha uses an extra fuel gate to allow more fuel into the engine when you lift your thumb – this squirts a bit more raw fuel into the engine so it doesn’t rpm down as fast….and is designed to take away the engine braking.

In the case of the aftermarket clutches – they are set up more to what I would classify as drag race clutching. This style is for faster up shifting but it sacrifices a little backshift in the balance of things.

There is nothing wrong with that…customers are happy – sleds are faster than stock..and the big 4/ doesn’t seem to be bothered by a little more lugging to compensate – it has the power. It’s all good.

 

[Srxspec]

Actually the only sled that has the Engine Braking Reduction System (EBRS) is the FX Nytro models and I believe the new 120FI in the RS Venture GT for 2009. This actually pushes fresh cold air without any extra fuel into the intake tract under rapid deceleration of the throttle creating a lean condition causing the engine to hang up and this leads to a less effective engine braking.

 

[RJH]

Right... it is air not fuel. The multi system works the idle system as well....keep the engine at the 1500 rpm.

Not all sleds have it - right also.