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Speed Triple Forum Rants and ravings about the best naked triple on the planet!

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Old 11-25-2012, 03:57 PM   #51 (permalink)
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I know I'm on the wrong forum here but my '04 Daytona 955i, unless my speedometer is way off the mark, i've hit over 140 in 4th gear and i've hit 153 in top gear with a little more throttle left. I have a 17t countershaft sprocket and a 43t rear so maybe that has something to do with it. Also a PC3 and a K&N also.
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Old 11-25-2012, 04:41 PM   #52 (permalink)
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Most bikes reach peak HP at LESS than rev limit... so you will go faster, at a lower RPM, because the power that pushes you to 145, may not be available in the upper RPM ranges.
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Old 11-25-2012, 07:11 PM   #53 (permalink)
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That '04 Daytona has two significant advantages over any 'unmodified' S3 - an extra 30hp, and much better aerodynamics. Both payoff in a significant way at high speeds.
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Old 11-25-2012, 08:14 PM   #54 (permalink)
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Quote:
Originally Posted by FoothillRyder View Post
That '04 Daytona has two significant advantages over any 'unmodified' S3 - an extra 30hp, and much better aerodynamics. Both payoff in a significant way at high speeds.
exactly!


also the 1050 will pull right up to, and through redline, if tuned properly.

but she won't last long wound out.
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Old 11-26-2012, 12:00 AM   #55 (permalink)
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After owning a GSXR1000 i couldn't care less what the S3 does in a straight line........Corners is where the fun is at!!!!!!!
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Old 11-26-2012, 07:17 PM   #56 (permalink)
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After owning a GSXR1000 i couldn't care less what the S3 does in a straight line........Corners is where the fun is at!!!!!!!
I'll go along with that.
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Old 11-27-2012, 12:56 AM   #57 (permalink)
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Which 955 does he have, Speed Triple or Daytona? Big difference.

Either way, the 1050 will have a little more torque in the mid-range and should pull better there; at top-end, the Daytona motor with 20Hp more will have higher max speed.
He has a 955 Speed triple. Is it in the gearing? he also has a different sproket I think 1 tooth up in the front?

Spent four hours on his bike on Thanksgiving (that's what he gets for storing it at my place for the winter and the temp hits 55 on Turkeyday) and it just doesn't seem to have all that mine has.
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Old 11-27-2012, 04:24 AM   #58 (permalink)
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without examining the math, I'm having a hard time believing these vehicles with power/weight ratios better than that of some supercars, can't exceed 140. I see posts of people hitting 130 in their stock civics, surely a bike is going to produce less drag than any car? Isn't 140 typically the figure that speed governors are set at?
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Old 11-27-2012, 10:17 AM   #59 (permalink)
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without examining the math, I'm having a hard time believing these vehicles with power/weight ratios better than that of some supercars, can't exceed 140. I see posts of people hitting 130 in their stock civics, surely a bike is going to produce less drag than any car? Isn't 140 typically the figure that speed governors are set at?
Unfortunately at those speed it is quite the opposite, the car and the bike will have similar drag coefficients thus whoever with the most hp will come out on top.

Found this on the R1 forum that explains it way better than I can:

original post at http://www.r1-forum.com/forums/showthread.php?t=235116

Originally Posted by DoinTime
Total drag (Dt) and drag coefficient (Cd) are two completely different but related things. Cd is equal to the coefficient of parasitic drag (Cdp) plus the coefficient of induced drag (Cdi). Cdi is minimal on motorcycles though so it can be effectively disregarded.

Total drag (in lbs) can be found by multipyling the Cd, dynamic pressure* (q), and the surface area (S).

* dynamic pressure is made up from the density ratio (local air density accounting for local altitude, temperature, and barometric pressure measured against standard density) multiplied by the air velocity in knots squared. The resultant of that is then divided by 295.

The formula looks like this:

Dt=Cd(q)S

As you can see drag is determined by five factors. Cd, surface area, local pressure, local temperature, and air speed.

As the above poster mentioned, high end sports cars generally have Cd numbers in the mid 0.3s. Motorcycles however have Cd numbers close to 1.0 depending on the model bike, size of rider, and riding position. In looking at the formula you should be able to deduce one major point. Drag is increasing exponentially with speed.

Plugging in some generic numbers show this better.

Variables: Standard atmosphere (sea level, 15 degree C, and a barometer of 29.92), Car at .35 Cd. Bike at 1.0 Cd. Car surface area at 19 sq. ft. Bike surface area at 7 sq. ft. (surface areas and Cds are approximate numbers).

50 kts

Bike Dt = 59.32 lbs

Car Dt = 56.35 lbs

100 kts:

Bike Dt = 237.3 lbs

Car Dt = 225.44 lbs

150 kts:

Bike Dt = 533.90 lbs

Car Dt = 507.20 lbs

Conclusion:

In the case of cars vs. bikes the bikes generally have triple the Cd but 1/3 the surface area so Dt remains about the same regardless of speed. Cars kick the crap out of bikes at high speeds because at high speeds the predominant factor is aerodynamics. As speeds increase the rate of acceleration decreases and the superior HP/weight ratio that gave the bike superior acceleration at low drag speeds cease to be the deciding factor. At high speeds where rates of acceleration are minimal you need horsepower to overcome the drag factors. As we have seen, aerodynamic drag is approximately equal so whoever has the most horsepower wins.
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Old 11-27-2012, 11:02 AM   #60 (permalink)
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Believe it man. The only thing any of my bikes have been limited by are HP and drag. Thanks to Tuneboy, Tune ECU, Ignitech Ignitions, and in my Suzuki days, well placed proper value resistors. The bottom line is that it's just not happening!
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Originally Posted by 12340987 View Post
without examining the math, I'm having a hard time believing these vehicles with power/weight ratios better than that of some supercars, can't exceed 140. I see posts of people hitting 130 in their stock civics, surely a bike is going to produce less drag than any car? Isn't 140 typically the figure that speed governors are set at?
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