opening a can of worms... - Wrist Twisters
 
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post #1 of 23 Old 02-06-2012, 06:11 AM Thread Starter
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opening a can of worms...

I know I will probably get shit for this from some but oh welll....

I am beginning to think that the 919 has a soft speed limiter to 142mph...

I live in Fla and have miles of straight stuff that opens wide at night with no traffic, I put a f4i cluster on my bike and speedo healer. It is dead accurate verified with gps. the bike will get up to 138 no problem, the next 4 mph take a little bit but not that long, once there you can feel the bike picking up steam and then dropping back down.

thoughts...


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post #2 of 23 Old 02-06-2012, 06:41 AM
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post #3 of 23 Old 02-06-2012, 07:17 AM
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Video posted doesn't say there is a speedohealer, and it's known that with stock gearing that the speedo is optimistic about the actual speed.

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post #4 of 23 Old 02-06-2012, 09:45 AM
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Quote:
Originally Posted by Jeef View Post

I am beginning to think that the 919 has a soft speed limiter to 142mph...
My internet-guess is that there is no speed-limiter.
Rather, aerodynamics are your speed-limiter.

The bike makes 105hp, similar to 600 #'s.
Top 600's hit... 150-155mph? With muuuch better aerodynamics.

If the 919 did have a speed-limiter, my guess is it's purely a safety issue. Perhaps the bike could become unstable at greater speeds. (Although I know it's been mentioned around here how unflappable the geometry of the bike is.)

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post #5 of 23 Old 02-06-2012, 10:28 AM
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stock gearing has a theoretical top speed of 151.8 @ 9500. he hits [email protected] aprox. 9700 in the above video.
the 9er's speedo reads @ 8% high so something is fishy.his speedo should be aprox 157 mph at that rpm.

jeef what rpm are you at top speed?

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post #6 of 23 Old 02-06-2012, 10:57 AM
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My 9er has gears that supposedly make it accurate, and I've had mine to 150.
I just got my ram mount in the mail, so I'll see what top speed is with gps.

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post #7 of 23 Old 02-06-2012, 11:22 AM
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i've hit 143mph and my front end started to get the death wobble. So i dont do that anymore.

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post #8 of 23 Old 02-06-2012, 11:27 AM
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A naked upright that weighs 460 ish # before rider, and has 110 HP @ the crankshaft at sea level.
Hmmmm,
I'd say about 15 % short of the required bhp to be able to touch 150.

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post #9 of 23 Old 02-06-2012, 12:11 PM Thread Starter
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will have to check out the tach next time and see where I'm at, I'm running 16/44 gears though

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post #10 of 23 Old 02-06-2012, 12:38 PM
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Quote:
Originally Posted by Jeef View Post
will have to check out the tach next time and see where I'm at, I'm running 16/44 gears though
im running 17/44 i believe. so i dont know how the math works out for the actual speed

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post #11 of 23 Old 02-06-2012, 01:03 PM
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Quote:
Originally Posted by brenner182 View Post
i've hit 143mph and my front end started to get the death wobble. So i dont do that anymore.
A 919 should be dead smooth stable at top end, hands off so to speak, even though I'd suggest keeping both hands on.
Are your fork tubes raised up in the clamps ?

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post #12 of 23 Old 02-06-2012, 01:07 PM
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Quote:
Originally Posted by Jeef View Post
will have to check out the tach next time and see where I'm at, I'm running 16/44 gears though
A 919 with stock rear wheel tire diameter, geared with 16/44, and truly going 142 mph will have to be revving at an actual 9165 RPM.

919 speedos over indicate.
919 tachs over indicate.

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post #13 of 23 Old 02-06-2012, 01:17 PM
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Steve and I had them pegged out at about 145 on the speedo which with my 17/44 is not all that inaccurate compared to the OEM gearing which is very optimistic. Still not too bad considering I had saddle bags a Ventura rack and cooler on the back

With stock gearing the speedo is 7-8% optimistic at freeway speeds, but that error grows as the rate increases so by the time you are doing an indicated 130mph the error can be as high as 14% or more.

When you install the taller gearing of a 17T you are basically correcting that inherent error built into the speedo.

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post #14 of 23 Old 02-06-2012, 02:38 PM
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I got up to 130 and said "good enough." Also 17/44 gearing.

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post #15 of 23 Old 02-06-2012, 02:51 PM
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I have LDHs 17/44 conversion and sounds about like how you described it Jeef. Get up to 135 in a hurry and creep up to 144ish

Aside from the guys that get track time, we are all speaking hypothetically though

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post #16 of 23 Old 02-06-2012, 03:26 PM
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Quote:
Originally Posted by mcromo44 View Post
A 919 should be dead smooth stable at top end, hands off so to speak, even though I'd suggest keeping both hands on.
Are your fork tubes raised up in the clamps ?
i've never really checked to be honest.

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post #17 of 23 Old 02-06-2012, 05:20 PM
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Quote:
Originally Posted by andrewebay1 View Post
I have LDHs 17/44 conversion and sounds about like how you described it Jeef. Get up to 135 in a hurry and creep up to 144ish

Aside from the guys that get track time, we are all speaking hypothetically though
same boat here.

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post #18 of 23 Old 02-06-2012, 05:42 PM
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BHP required to overcome a linear increase in speed increases by the 3rd power.
Meanwhile, the engine's BHP output with increasing RPMs as you approach peak BHP, is fairly linear in a 919 BUT near peak, becomes non linear as it starts to go flattish.
So, as you crowd the power based aerodynamic on a 919, the power needed is climbing steeply BUT your engine power available is instead increasing at an ever lessening rate. This is the classic reason why the last few mph of any top end run is at a walk up rate in terms of the actual rate of acceleration.

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post #19 of 23 Old 02-06-2012, 05:51 PM
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Quote:
Originally Posted by Pvster View Post
same boat here.
Run ups to 130-135 on the road don't take long.
I've never found a stretch long enough and safe enough (deer on the sides of the road included) to let it fully wind out.
I sense that it can crack an honest 140 here where I am, that being 3500 ft altitude.
A sea level run should theoretically add another 5 mph.
I figure sea level limit is in the 143 -145 band, if ideally geared, and also being bike and day's air dependent. I think a sharply mapped bike with decent slip ons and lower bars like ULs should be good for 1 or 2 mph, that being part of my setup.

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post #20 of 23 Old 02-06-2012, 05:54 PM
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155 top for me.rear tyre 190/50/17.

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post #21 of 23 Old 02-06-2012, 05:56 PM
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Quote:
Originally Posted by giorgos View Post
155 top for me.rear tyre 190/50/17.
indicated, not real

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post #22 of 23 Old 02-07-2012, 01:14 PM
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theres also the issue of the rev limiter no one has spoke of
go bang your gears at a dragstrip, you'll know then
IMHO, fuck street speed, i save it for the track, or just passing a yayhoo when needed (in my case, a lot, LOL!!)





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post #23 of 23 Old 02-07-2012, 07:03 PM
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theoretical speeds @ 9500 rpm

16/44 = 148.3
16/43= 151.8
17/44 = 157.5

@ 10,000-

16/44= 156.1
16/43=159.7
17/44= 165.9

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