Slipper Clutch and Braking question.

[Lee1200r]

I've notice coming into a downhill left hand turn and downshifting from 4th to 2nd the rear is more stable if I blip the throttle going into second. I've tried both no blip and blipping and blipping is more stable. Anyone know why this is? On most other turns I let the slipper clutch do it's thing and it works fine, not sure why the down hill would make a difference?

[dePunietS1000RR]

Originally Posted by Lee1200r

I've notice coming into a downhill left hand turn and downshifting from 4th to 2nd the rear is more stable if I blip the throttle going into second. I've tried both no blip and blipping and blipping is more stable. Anyone know why this is? On most other turns I let the slipper clutch do it's thing and it works fine, not sure why the down hill would make a difference?

I always get rear shake when I brake really hard and downshift without blipping (the lower the gear I end up in, the worst the rear movement as the back torque is harder in the lowest gears). There is so little weight left in the rear wheel that any resistance will slide the wheel. In a downhill, you get even less weight on the rear wheel under hard front braking than on a flat surface (also, your bike will stoppie a lot easier than on flat).

It's always better to blip. It'll avoid the rear movement and save your clutch plates. It's a good habit anyway and can save your hide if you borrow your friend's 1198 with no slipper clutch...

[HardRacing]

Originally Posted by Lee1200r

I've notice coming into a downhill left hand turn and downshifting from 4th to 2nd the rear is more stable if I blip the throttle going into second. I've tried both no blip and blipping and blipping is more stable. Anyone know why this is? On most other turns I let the slipper clutch do it's thing and it works fine, not sure why the down hill would make a difference?

.

The Stock slipper clutch in the S1000RR is not the best design.
Yea. It does work.

But, not perfectly all the time. Certain instances it will work fine, and others it won't work that well.

Everyone has their opinions of the Stock Slipper.
But, until you experience a really good quality one that uses roller bearings on 5 or 6 ramps, it's hard to explain.

What you are experiencing is just the variences with the stock Slipper Clutch.

.

[Lee1200r]

Originally Posted by HardRacing

.

The Stock slipper clutch in the S1000RR is not the best design.
Yea. It does work.

But, not perfectly all the time. Certain instances it will work fine, and others it won't work that well.

Everyone has their opinions of the Stock Slipper.
But, until you experience a really good quality one that uses roller bearings on 5 or 6 ramps, it's hard to explain.

What you are experiencing is just the variences with the stock Slipper Clutch.

That is very possible since this is the first bike with a slipper clutch I've owned and no experience with others.

[A.B.]

Even with the slipper, I still blip.

Have noticed the lesser engine braking though as compared to my VFR...

[dePunietS1000RR]

Originally Posted by Lee1200r

That is very possible since this is the first bike with a slipper clutch I've owned and no experience with others.

The slipper clutch on the S1000RR is actually really effective and totally fine.

Even an STM or other aftermarket will not completely remove the engine
braking (Thankfully as engine braking is really useful to slow down and to settle the bike for the turn). (I have an STM on my Ducati and still get lots of fishtailing when not bliping).

Under hard enough braking with little weight on the rear, the rear wheel will slide if you don't blip (especially if you end up in a really low gear). Note that most bike in World superbike have automatic blipers. They don't fully rely on slipper clutches for downshifting without bliping.

The riding advice I would give you is to try to blip and also use your legs to grab the tank under hard braking. Putting all your weight on the handlebar with stiff arms will lessen the rear wheel weight even further and make it more likely to fishtail. Another thing would be to look at your rebound on the rear shock and your compression on the front fork. If you have too much rebound damping on the rear, the bike will be likely to fishtail under hard braking, if you don't have enough compression damping in the front, same thing. If you have the stock forks, compression at 5 is just not appropriate for hard braking. You would need to be at least at 8, use a zip tie on the fork to see how much travel you use when braking hard. (depending on your weight of course. I weight 180lbs).

IMHO there is a lot of things with instant gains to be done on that bike before getting a new clutch (mostly in the suspension and front master cylinder department)

[Lee1200r]

Originally Posted by dePunietS1000RR

The slipper clutch on the S1000RR is actually really effective and totally fine.

Even an STM or other aftermarket will not completely remove the engine
braking (Thankfully as engine braking is really useful to slow down and to settle the bike for the turn). (I have an STM on my Ducati and still get lots of fishtailing when not bliping).

Under hard enough braking with little weight on the rear, the rear wheel will slide if you don't blip (especially if you end up in a really low gear). Note that most bike in World superbike have automatic blipers. They don't fully rely on slipper clutches for downshifting without bliping.

The riding advice I would give you is to try to blip and also use your legs to grab the tank under hard braking. Putting all your weight on the handlebar with stiff arms will lessen the rear wheel weight even further and make it more likely to fishtail. Another thing would be to look at your rebound on the rear shock and your compression on the front fork. If you have too much rebound damping on the rear, the bike will be likely to fishtail under hard braking, if you don't have enough compression damping in the front, same thing. If you have the stock forks, compression at 5 is just not appropriate for hard braking. You would need to be at least at 8, use a zip tie on the fork to see how much travel you use when braking hard. (depending on your weight of course. I weight 180lbs).

IMHO there is a lot of things with instant gains to be done on that bike before getting a new clutch (mostly in the suspension and front master cylinder department)

I am not unhappy with the stock slipper just wanted some feedback in the one situation. As I said it works fine in most cases just different in downhill braking. I am sure some of it is lack of weight on the rear but it is very stable downshifting and braking from 5th to 4th an 3rd. It's just that last downshift to 2nd and I am starting to trail off the brakes by that time. And it's the only time I need to blip the throttle to keep it from moving around.