zx6r top speed

[Clivoris]

Aprilia Tuono.
254kmh measured on flying quarter mile.
257kmh recorded on speedometer.
I wonder why other manufacturers can't be that accurate?

[icekiwi]

Get in touch with the dude who has the laser gun and remove the doubt...
I found my speed is connected to my arsehole...faster i go tighter it gets...
265k ("indicated" for the purists)and it feels like a marble bag with the draw string up to the max...
Just enjoy it dude the cops will if they get you over 145...lol

[YellowDog]

Thanks. Something which is a bit hard to measure dead accurately, even with the many types of radors out there aye.

That is why a cop can't do you unless he has had his equipment recently calibrated.

[slopster]

Tested it on a gps today - not to full speed though. Came up with an 8% error speedo reading faster. So that means my actual top speed is around 233 which is definitely too slow for a near new 600. What sort of things would cause this, it runs perfectly other then that. Its bog standard (as far as I know I am the second owner though) and only done 4500km. Does feel quite a bit slower then my old gsxr750t but I'm not that worried cos I got it for the handling, not the power and it sure knows how to go round corners.

[discotex]

Interesting. My speedo and tacho are totally in sync. I was doing calculations for how much top end I'd lose dropping a tooth and I noticed 6000rpm in 6th should be 113km/h.

Next time I went on the motorway I checked and it was spot on.

Guess the rpm and speed could go out at higher rpm though.

[NinjaBoy]

Have you done the jumper mod ? First time on the track without the mod against a GSXR was embarrassing.

[slopster]

No does it really make much difference? I was told it would only make 1 or 2 extra hp. Which wires do I bridge and where do I find them.

[NinjaBoy]

The horsepower difference is not much but the top speed retardation when the exhaust valve closes at top revs is very noticeable.

Do a google for 'jumper mod'. Its a blank (unconnected) plug under the seat which you need to jumper a couple of pins across with some lockwire (or a staple )

Hardest part is finding a secluded straight piece of road to get it to the red line !

[HDTboy]

I've got a set of high flow headers for one of these bikes which I modified. There's a lot that can be done to them relatively cheaply to get more power if that's your thing. You know how to get hold of me

[Edbear]

...Can't remember who said it - but in the end the only two people who care about how fast you're going is you and the police officer who pulls you over.

Wise man, that!

Oh it's not hard at all. In fact it's achievable with cheap components to get it within 1%. But then what would the marketing guys do?

Remember that the pulses taken for revs would be the same as those taken for injection etc which are incredibly accurate. Any error in the rev's is intentional.

Interesting point!

Aprilia Tuono.
254kmh measured on flying quarter mile.
257kmh recorded on speedometer.
I wonder why other manufacturers can't be that accurate?

'Cause then they'd get left behind in the "Mine's faster than yours!" race...

[madbikeboy]

Interesting stuff. Mine says 299 sometimes*. It stops there. Not sure what that's about. Maybe the manufacturers got together and decided that if a speedo didn't read any faster than that, it was more socially acceptable.

Speedo's lie like lawyers and politicians. No excuse for the rev counter to lie though - that should be more precise. R6's are quietly infamous for being optimistic with RPM.

*tested under controlled conditions, and not on a public road.

[Mikkel]

Tested it on a gps today - not to full speed though. Came up with an 8% error speedo reading faster. So that means my actual top speed is around 233 which is definitely too slow for a near new 600.

Exactly what makes you think 233 km/h is too slow for a near new 600 ccm sportsbike?

Is it because it doesn't match the performance figures released by the manufacturer?

Is it because it's not fast enough for the public road?

Or?

We already touched upon the "little white lies" in marketing...

A speedo deviation of only 8% at these speeds is not bad at all.

Is this at the red line or do you not reach the redline at top-speed?
If not someone could have changed a sprocket (or fitted a close ratio gearbox). If you make the gearing lower you'll have more acceleration but you'll run out of revs before you run out of puff...
If you want to speed you want your gearbox to match your top-speed with the maximum power in the rev range (NOT redline!)

E.g. a dodge viper will not reach it's top-speed in top-gear, but in the second highest instead. The final gear is there to allow "efficient" cruising at high-way speeds and it's so tall that the engine won't hit max power until way after top speed is achieved.

[HDTboy]

Exactly what makes you think 233 km/h is too slow for a near new 600 ccm sportsbike?

Every 600 sportsbike from 2000 on will do over 260km/h indicated.
A 2007 ZX6R will do 280km/h on the speedo with very limited modification.

[mynameis]

That is why a cop can't do you unless he has had his equipment recently calibrated.

Yeap and that is within the last 12 months.

Question how come most times cops clock you at same speeds as indicated though ??

[onearmedbandit]

Exactly what makes you think 233 km/h is too slow for a near new 600 ccm sportsbike?

Is it because it doesn't match the performance figures released by the manufacturer?

It's actually very rare for manufacturers to give performance figures on bikes these days, they are simply not interested in the top speed pursuit. What matters is power, weight, and wheelbase/rake etc. If you look at my post at the top the actual top speed of a ZX6R is higher than what the OP got on his bike, and indicated higher again.

162mph x 1.609 = 261km/h
181mph x 1.609 = 291km/h