Does anyone practice downshifting w/ emergency braking? - Page 7 - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #61 of 69 (permalink) Old 09-13-2020, 03:58 PM
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post #62 of 69 (permalink) Old 09-14-2020, 01:01 PM
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Quote:
Originally Posted by TheBigG View Post
I hope you do know that ABS is not for a shorter braking distance but for one to be able to controll the vehicle during braking.
One can get shortest braking distance by applying pressure to the point right before ABS would kick in.
https://www.nhtsa.gov/sites/nhtsa.do...t4finalrpt.pdf
results start on page 23. many charts show the shortest stopping distance using ABS. Several surfaces were tested as well as different vehicles.



Apparently ONE important thing was not tested. That was the SURPRISE OBSTACLE. Which is very common in motorcycle accidents. A rider surprised by an obstacle adds an element of loss of find motor control and momentary mental breakdown which in most cases removes the option of modulation of braking at the cusp of ABS operation.
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post #63 of 69 (permalink) Old 09-14-2020, 02:29 PM
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Rebuff #2 posted. Just sayin'.......
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post #64 of 69 (permalink) Old 09-17-2020, 07:40 PM
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Originally Posted by slowdave View Post
You don't HAVE to downshift with the decrease in speed. You can just pull in the clutch and come to a stop in top gear. May have to half let out the clutch in each gear as you downshift at a standstill but there is an alternative. I've never had a vehicle that would tolerate a straight downshift to 1st gear at highway speed with the clutch in. Gears are trying to engage that are spinning at WAY different speeds and many cars have an interlock to prevent you doing that so you won't break stuff.

Caveat that stopping in top gear does leave you susceptible to the immediate need to go and not being able to. In my experience, when I've had a full emergency stop, whatever I narrowly avoided hitting is directly (and closely) in front of me so I can't go anywhere anyway so...

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When I first got the YZF (first time ever on a motorcycle) I started out trying to do that... and often found difficulties getting back into first gear. Other gears were generally okay. What I didn't know at the time was, I just had to roll the bike back or forward <1 foot to get engagement. Then you'd have that loud (but harmless) engagement of first while at stop. It was just easier (and much quieter) to downshift back into first as the bike was rolling to a stop. Besides that and as you also point out, there is an advantage to being able to move (even if not super quick) by downshifting with the decrease in speed. Even if one finds themselves one gear too high, to get going in an emergency the clutch can be slipped. Far slower than being that lower gear but way quicker than taking the time to downshift.
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post #65 of 69 (permalink) Old 09-17-2020, 07:45 PM
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Originally Posted by Linton West View Post
I never use the gearbox to reduce speed, as someone once said brake pads are much cheaper than gearboxes and I can't multi task.
Yup. Brakes were designed to stop the vehicle. The engine/transmission wasn't. Unless one is decending a mountain there's no real need for routinely using the engine/trans in lieu of normal braking.
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post #66 of 69 (permalink) Old 09-18-2020, 07:08 PM
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It is normal to match the gear to the bike speed, and I never heard of a transmission failure due to doing this.
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post #67 of 69 (permalink) Old 09-18-2020, 11:28 PM
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Be aware of those who have had second gear dogs wear and had to go through engine teardown to fix it......... I recommend you do ensure any shift from 1-2 or 3-2 be very positive so second gear dogs are fully engaged. It's more than a $2000 repair at a dealer if you can't do it yourself.
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post #68 of 69 (permalink) Old 09-19-2020, 07:53 AM
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Quote:
Originally Posted by mobilemike View Post
we are talking two different scenarios here.

1) Impact is imminent, there is no avoiding it. The only function is to scrub as much speed as possible before impact. With ABS you grab as much front and rear brake as physically possible and hold until the end. No clutching no shifting. Nothing but full ABS deployment and brace for impact.

Many times coming to a stop is so violent the bike falls over even if you did not hit the object.

2) Impact is likely but avoidance is possible (even if slim) This is when you have time to evaluate the situation. Look for escape or avoidance avenues and modulate controls for other options besides 100% braking only.
Very well said...........

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post #69 of 69 (permalink) Old 09-19-2020, 03:12 PM
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Originally Posted by RaYzerman View Post
Be aware of those who have had second gear dogs wear and had to go through engine teardown to fix it......... I recommend you do ensure any shift from 1-2 or 3-2 be very positive so second gear dogs are fully engaged. It's more than a $2000 repair at a dealer if you can't do it yourself.
For my YZF, I'll occasionally have to bend the aluminum shift lever back out an inch or so. Over time it gradually moves inward toward the bike; more quickly if it was dropped on its left side. Bending it back out helps get that solid feel back. Might be something to look at on the FJR; don't know.

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