09 S3 145mph top speed?????? How????

[onesaintsfan]

2009 Stock Speed Triple with a 280lb 6'4' rider by the GPS will do 128mph max. Ask me how I know

[morvegil]

I'm 220 and get 145

Sent from my motorcycle while riding.

[jimlowe]

I lived in Germany when in the armed forces and owned a kawasaki zzr1100,fastest I saw on the clock on the Autobahn was just over 170 mph,wasn't fun just scary.on slight bends the centrifugal force was try to throw me into the barriers,I'm a bit older now and dont think I will be trying to find out how fast my triple is any time soon

[Twisty King]

Another thing to factor in would be that most speedometers are not correct once you start hitting such high velocity. My Yamaha R6 will tell you that you are going 186 MPH when in fact it tops out at 155 unmodified. My friends CBR600RR is the same. This could be something to consider as well.

[bira]

Originally Posted by 12340987

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?

It's called gearing and wind resistance. Theoretically, the '09-'10 Speedy should do about 168 @ 10,000rpm. However, peak hp is at 9400, I believe. This would mean you'd be hard pressed to hit 10,000rpm in 6th unless modifying the bike to reduce wind resistance. At 9,400rpm you would be going about 158mph, again theoretically, wind resistance may keep you from even getting to that speed.

[12340987]

Originally Posted by bira

It's called gearing and wind resistance. Theoretically, the '09-'10 Speedy should do about 168 @ 10,000rpm. However, peak hp is at 9400, I believe. This would mean you'd be hard pressed to hit 10,000rpm in 6th unless modifying the bike to reduce wind resistance. At 9,400rpm you would be going about 158mph, again theoretically, wind resistance may keep you from even getting to that speed.

Makes it more believable to me when you factor in gearing, I guess. But a 140 hp civic going 130? Just doesn't seem right. Why would god do such a thing?
http://www.9thgencivic.com/forum/9th...our-civic.html

[zelatore]

12340987, you might be surprised at the Cd of a naked bike vs a car. The car has more frontal area to be sure, but the Cd is usually so bad on a bike like that this that it makes up for it.

For reference, a typical sedan these days probably comes in around .30 Cd or lower. Examples:
Mazda 6, Honda Civic hybrid, Lexus GS - .27 Cd,
Toyota Camry, Nissan 350Z, Mercedes SL - .29 Cd
Honda Odyssey, Honda NSX - .30 Cd

As you can see, physical size has less to do with drag than you might expect.

I didn't find an Cd numbers for bikes, but I understand they run closer to 1.0 - or 3+times as much drag as a modern car. Open, exposed wheels and no fairings are just bad at parting the air.

[FoothillRyder]

I remember reading (many years ago) that a well designed racing bike has a Cd of something like 0.7, which is why a modern MotoGP bike will top out at something like 220, even with 250hp.

An S3 (and any other nekkid bike) is going to be much higher than that, so zelatore is not too far off with that 1.0 'guess'.

[FoothillRyder]

Originally Posted by morvegil

I'm 220 and get 145

It isn't so much weight as it is size. The previous poster, at 280lb and 6'4", is putting a lot more 'frontal area' in front of that wind.

[12340987]

Originally Posted by zelatore

12340987, you might be surprised at the Cd of a naked bike vs a car. The car has more frontal area to be sure, but the Cd is usually so bad on a bike like that this that it makes up for it.

For reference, a typical sedan these days probably comes in around .30 Cd or lower. Examples:
Mazda 6, Honda Civic hybrid, Lexus GS - .27 Cd,
Toyota Camry, Nissan 350Z, Mercedes SL - .29 Cd
Honda Odyssey, Honda NSX - .30 Cd

As you can see, physical size has less to do with drag than you might expect.

I didn't find an Cd numbers for bikes, but I understand they run closer to 1.0 - or 3+times as much drag as a modern car. Open, exposed wheels and no fairings are just bad at parting the air.

But the cD of an upright cell phone would be much higher than a boeing 747, which would go faster if attached to my poor little t509?

So do bikes not have speed governors?