top speed for 600's at Daytona?

[ryan]

Just curious on this. Last spring at daytona I was on an 03 R6. About 113rwhp on U4.2 and was running 16/47 gearing (+2 up from stock).  Going through Nascar T-4 my speedo was showing 162mph.  How accurate would this be compared to my actual speed? What do bikes putting down around 115rwhp usually top out at, on the spring Daytona configuration?

Thanks,

[khanson]

AMA bikes will hit 178 on the banking.

[Super Dave]

Just curious on this. Last spring at daytona I was on an 03 R6. About 113rwhp on U4.2 and was running 16/47 gearing (+2 up from stock).  Going through Nascar T-4 my speedo was showing 162mph.  How accurate would this be compared to my actual speed? What do bikes putting down around 115rwhp usually top out at, on the spring Daytona configuration?

Thanks,

And, usually, I've seen that the speedo's are off close to 10%.  Meaning that if you were indicated 162, you might have been doing 156. 

More importantly, though, your lap times.

[Scotty Ryan]

When I was riding for khanson I saw 190 something on the speedo with the 07' Safety First bike.... So factor in the 10% Super Dave mentioned. This season on the ZX6 I rode in the 200 - the AMA charts had me at 177-178 coming off the banking onto the tri-oval. Not bad for a privateer bike - Granted the bike made 130 +/-  rwhp - So it definitely wasn't stock :)

The SpeedWerks.com Sv650 I rode in the Moto-St was about 145mph maybe a little less. The bike made 75hp - But the big problem that you run into is the amount of air you are pushing.

TZracer can prolly give us the mathematical breakdown on that one :)

[tug296]

Hodgson's superbike did 194 + at the tire test, I think I heard of 176 mph on a AMA "supposed" Supersport spec bike year before last.

[kl3640]

Just figure for your gearing from stock and the 10% wheel spin (not sure though if the 10% applies to 600's or only the 1000 Superbikes).

[123user]

I think the 10% is a reasonable approximation of tire + clutch slippage for just about anything over 100hp.  My 1000SS "fudge" factor for slippage is 9%.   That number was derived semi-scientifically on a load control dyno.  Without the the slippage factor your top speed calculation becomes a little ridiculous- unless your at Bonneville.

In my experience both speedo and tachs are way off.  When I got a ticket for doing 120 in a 55 on my TL, I could of sworn the speedo read 140, but I just took officer Tenoria's word for it.

[MegRyan]

On the tradditional config that we ran this fall - Scotty's GPS laptimer I had on my bike read 170mph. My bike puts out 115hp.

[Garywc]

during the Daytona 200 last march my speedo read 182 mph with stock gearing and stock motor on a 2007 R6.
and i figured the 10% that everyones says it should be off it would be around 164 mph. I dynoed the bike at the VIR ASRA round and it had 103 hp

[Faas73]

2006 R6 with usual supersport stuff -- I saw 174 logged this past October as a top speed on my AIM data acquisition unit, with the tire size programmed from Pirelli's provided specs (a magnet is used on the rear wheel). Of course, this is only valid (or at least "more valid") when the bike is straight up and down, so it may be providing a slightly higher-than-actual number when the bike is leaned over.

[MELK-MAN]

FYI.. 16/45 is stock gearing on an 06-07 r6.... NOT the 03-04-05 r6. Stock for those bikes was 16/48. So, your down 1 tooth from stock.

[Fast4fun]

If your stock gearing assumption was correct (+2) and your speedo is spot on, your actual speed was 154.80 mph. If Melk Man is correct then your actual speed was 165.375 mph. This is assuming that your speedo is correct which, being a yamaha and all, if it's like the RPM indication, you're off by at least 10%. Either way, you were flying.

I'm not an engineer but I believe the need for hp goes up exponentially for additional mph when you approach those speeds (assuming constant aerdynamics). In short that would mean that you should look elsewhere for better lap times or draft for more speed.