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Buell Forum » 1125R Superbike Board » Archives 001 » Archive through October 13, 2008 » Whats my speed? « Previous Next »

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White79bu
Posted on Monday, September 29, 2008 - 08:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I did my third track day with the 1125r today. I had my speedo taped up and I was running around 9500-10000 rpm in 5th gear. Does anybody know what kind of speed that is?

I can't do track days without the speedo being taped up. It messes with my head to much.
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Fresnobuell
Posted on Monday, September 29, 2008 - 08:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Not sure but I think its freakin fast.
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Dtx
Posted on Monday, September 29, 2008 - 08:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Oh wow...yeah thats a fast track.

Probably about 140.
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White79bu
Posted on Monday, September 29, 2008 - 08:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

It was at Mid-Ohio going down the back stretch. The scary thing is is that I could have very easily gone faster. But I am recovering from some type of flu bug and didn't feel like pushing the bike or myself real hard.

It was nice being able to keep up with all of the 1000cc I4 bikes. I even passed a few of them.
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Brent1125russ
Posted on Monday, September 29, 2008 - 09:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

On my first trackday with the 1125r, I touched 160 going into turn one at Spokane County Motorsports Park.....it took a couple weeks for me to stop smiling!
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Kttemplar
Posted on Monday, September 29, 2008 - 09:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

based on this spreadsheet from another poster on this board

http://www.badweatherbikers.com/buell/messages/290 431/397207.html

in 5th 9500rpm=144mph & 10000rpm=152mph
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Pariah
Posted on Monday, September 29, 2008 - 09:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The main thing that freaks me out about going so fast (>100mph) on a bike (versus a car) is what happens if a tire blows out? Even in a car, the result can be catastrophic. On a bike... yikes.

I know the MotoGP and Superbike racers go this fast regularly, but they've got fresh tires and a crew that looks them over... so make sure you look over your carcasses carefully.

Sorry for the somber comments... I'm still at work, and that probably has something to do with it.
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Fresnobuell
Posted on Monday, September 29, 2008 - 09:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I guess in a way it is good that the lifespan of a moto tire is only 4-6 months for most people. Keeps the rubber fresh!
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Pariah
Posted on Monday, September 29, 2008 - 10:03 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Here's a tire blow out at around 150mph (maybe better examples, but this is pretty interesting):

http://www.youtube.com/watch?v=WIEEJmJ36H4
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D_adams
Posted on Monday, September 29, 2008 - 11:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Actually, if the speedo was correct at about 320 kph, then he was doing about 190 mph or so.
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Slypiranna
Posted on Monday, September 29, 2008 - 11:14 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

High 140's to Low 150's...mph, pending "air"

and to think there is still another cog on that shift drum! : )
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Slypiranna
Posted on Monday, September 29, 2008 - 11:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Forgot to add...

How do you haul that wheel barrel in between your seat and tank?

!!!!
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Xb9
Posted on Tuesday, September 30, 2008 - 03:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I ran the Buell Inside Pass trackday at Mid-Ohio Sept.3, then ran that evening with the KTM crew so I put on a lot of track miles that day.

The Michelin slicks I was running that day - I knew I had worn out the front on the right side by the end of the day, and as usually I look over the tires frequently.

So I go to take the tire off the rim last weekend to put another on, and notice a nice 1" split in the tread just off center.
First thing I thought of was when I was looking at the speedo on the back straight and saw 158. I feel lucky and fortunate.
I gotta keep a better eye on the center part, not just the sides.....always remind yourself that this is not a badminton game. Preflight and inflight checks are a must.
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Rfischer
Posted on Tuesday, September 30, 2008 - 03:42 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Years ago, Yvonne DuHamel on a Yamaha at Daytona had a rear tire disintegrate at nearly 200 mph. Unbelievably, he did not go down.

But that was Yvonne DuHamel...a mere mortal would have been chum in the infield lake.
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Chadhargis
Posted on Wednesday, October 01, 2008 - 11:31 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Why would you tire "blow out"?

Unless it was grossly under inflated or old as dirt, typically motorcycle tires don't "blow out". If punctured, they lose pressure slowly which will induce a "loose" feeling in the bike. You'll know it when you feel it.

If the tire is worn, you will begin to spin the rear up or push the front a bit. If you're riding smoothly, and not whacking the throttle open and grabbing the brakes, then you should feel the "slip" and be able to make adjustments for it.

During high speed riding, you are primarily going in a straight line, and when you are straight up and down, and full throttle, there is very little stress on the front tire, but the rear tire is under stress. If it begins to fail, you should have your front tire free to brake and get off the track.
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Brent1125russ
Posted on Wednesday, October 01, 2008 - 02:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Tires typically blow out only when the max speed they are designed for is exceeded and the structural stability of the tire is compromised by the extreme centrifugal forces.

The other times you might see a 'blow out' would be if the tire was overinflated or overloaded, or something causes enough damage to the tire for it to loose structural integrity.
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Pariah
Posted on Wednesday, October 01, 2008 - 03:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The faster the tire spins, the more stress there is on the carcass... it's centrifugal force (increases as the square of the speed). At high speeds, there can be enormous stress on the tire--- tiny imperfections in the tire could cause a blow out if they are stressed enough.

You're putting a lot of faith in a manufacturer's ability to make a tire that is free of defects whenever you go fast...
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Xb9
Posted on Wednesday, October 01, 2008 - 03:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Any idea how much stress is on the front tire, near race pace, when you grab the brake lever at 158mph and you're trying to get it hauled down to about 45-50mph in the shortest distance possible?

What is more powerful - the engine or the front brake? Try this experiment:

Measure the distance it takes to go from 0-150 full throttle.
Now measure the distance it takes to go from 150-0 full application of the front brake.

No contest.

"If punctured, they lose pressure slowly"
That's a pretty good assumption on the street, but not always the case at racetrack speeds. I agree, modern tires are very good and "blow outs" rarely happen.

In this case I am referring to, it looks like a defect. It will be going back to the Michelin rep at the track for their analysis.
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Xb9
Posted on Wednesday, October 01, 2008 - 03:09 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

+1 Pariah
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Pridayr
Posted on Wednesday, October 01, 2008 - 03:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Well, as we all do every day... you can manage risk, but you can't eliminate risk.

Rob
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Xb9
Posted on Wednesday, October 01, 2008 - 07:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)


Ply separation I believe. about 3/8" deep.
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Pridayr
Posted on Wednesday, October 01, 2008 - 10:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Awww man! You can't even see the air inside yet! That's got another 2-3 track days left in it...

Rob
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Cutty72
Posted on Monday, October 06, 2008 - 09:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Redline 5th gear is 155mph indicated.
so at 10K, about 150ish.
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