help with an evr slipper

[MAXdB]

I'd like to get some help here.. so I recently installed an evr slipper clutch in my s4rs.. I was very excited to get it on and not have to worry about rev matching while downshifting but when I finally got it installed..I'm not sure I feel any difference in the engine/compression braking--I'll downshift a couple gears and dump the clutch only to have the bike have the typical twin engine braking.. I tried a couple more times with more speed & more gear changes but the same thing..

so my question is: am I expecting too much? I understand the evr slipper is supposed to prevent rear lockup but is that all? is there still supposed to be significant engine braking? is there a way to adjust the slippage (ie lessen the engine braking by taking springs off the pressure plate )?
Thanks everyone. btw, the clutch seems to work perfectly fine otherwise.

[He Man]

I think you don't really understand how engine braking works. It is a function of  weight  of the parts and compression inside the engine. Engine braking occurs because you are using the momentum of the bike (which is connected to the ground by the tire) to spin the engine. The heavier the parts are, the more energy is spent on moving the parts (and the greater engine braking you get). aside from compression, you didnt change much in weight, so you cannot expect there to be a difference in engine braking.


So yes, that's all you can really expect, and if you consistently ride hard enough to warrant a slipper clutch, then you should ecstatic about what a slipper can do for you. Otherwise you will just really end up seeing your money go to waste because those clutch plates wear extra fast.

[Slide Panda]

IS the EVR slipper adjustable? If so, you might have it set to a point where there's little to no slipper action.

[MAXdB]

lol..Thanks for the explanation of what engine braking is HeMan..helpful as always. I've owned a slipper on an inline four track bike so I have some experience with the typical ball/ramp slipper.. but I wanted to get some feedback from someone who has had first hand  experience with an evr on a twin

[He Man]

Cant help you with EVR, ive only had experince with the Ducabike slippers. The adjustment came from using different springs on it. Stiffer = less slippage (they fight against the bearing/ramp design), less stiff = more slippage. you can also adjust the stack height, but i always found that super tricky to do because it was really sensitive to the stack height. in this scenario the more plates there are, the less slipping there is, the less plates there are (the more space between the plates when the ball moves up the ramp) the more slipping there is. Im pretty sure this is universal to all slippers.

I ran a 749R stock slipper for a bit and yea, it chewed out the plates i ran. I didnt like it for street. damn thing moans like no tomorrow during hard take off.

I thought about it a bit and if you have less slip, than more force is translated from teh wheel to the spin the engine. if you have more slip, then less force is translated to the engine, hence you might feel a difference in engine braking there. So if you wanted less engine braking try to adjust it for more slip. just be aware, the more slip there is, the greater the pack wear. not sure what your bike is used for, it might not matter, but i put on more than 10,000 miles a year and clutch packs arent cheap.

[ShiftSix]

Well that brings up a good question,
What can one really expect out of their Normal clutch as far as mileage vs a slipper clutch.  Im talking normal riding not a track only bike.

[He Man]

various on how you ride.

i got 11k out of the 1st set and im on 15k on this set and probably another 3k at best,

for what its worth, i ride 80% city 15% twistys 5% track

and 80% city is hard stop n go 1st gear.

[ShiftSix]

Is this with the Slipper or the normal clutch?

[He Man]

Normal clutch.

Ducati OEM plates, Vee-two basket and hub, Speedymoto pressure plate and Stainless Springs.

[ShiftSix]

so if someone was upgrading to a slipper clutch are we to expect under normal or average riding 6-7000 miles?

[He Man]

depends on how you ride and how much slipping occurs. But it will be less than your normal miles per pack.

[errazor]

The heavier the parts are, the more energy is spent on moving the parts (and the greater engine braking you get).

If this is true why does "everybody" say that a lighter flywheel increase the engine breaking?

[Narflar]

If this is true why does "everybody" say that a lighter flywheel increase the engine breaking?

Because a flywheel is a mass in motion and it stores energy between the engines power pulses.  A lighter flywheel stores less energy so the effect of engine braking is greater. 

[He Man]

^ If you do a search theres a few threads that discuss it more in depth.