zx6r top speed

[slopster]

Had my zx6r wound out today on an appropriate bit of road. It ran out of puff at an indicated 240 and slowly crept to 250 but I don't think it had any more then another couple of km left to go. I know when I rode my mates gsxr600 it was good for an indicated 265 which really is quite a differance.

The 6r doesn't seem to be any slower so I thought maybe the speedo's actually accurate and the gsxr is a little exagerated (but it can be a little hard to judge these things). Anyone else had an 07 6r much past 250

[onearmedbandit]

Last year FastBikes magazine did a test on the 600's after the R6 rev issue. The results were as follows:

R6 Indicated Speed - 168mph Actual Speed - 155mph
ZX6 Indicated Speed - 181mph Actual Speed - 162mph
675 Indicated Speed - 165mph Actual Speed - 155mph
GSX Indicated Speed - 175mph Actual Speed - 157mph
CBR Indicated Speed - 171mph Actual Speed - 156mph

All of their rev counters lied as well, from the GSXR being 700rpm optimistic through to the R6 being 1700rpm over.

[bugjuice]

'indicated' has so many varibles, that it'll never be anywhere near what you're actually doing. I managed to hit the rev limiter in 6th on my 636, out the back of Puke. The 'indicated' speed was reading 287. I've heard of 05/6 bikes reaching a bit more than that. My bike felt strong pulling all the way up to the speed too, didn't feel like it was running out of puff. Get it onto a bigger straight and just whack it right open. I managed my speed with a bit of help from a race ZX10 that I managed to tuck in behind for a couple of seconds on the exit of Castrol

never understood why it's so hard to get the rev counter accurate tho. The R6 one I can kind of understand, cos they were boasting about a massively high redline, when really, most of it was on paper, but the other bikes.. can't be that hard to measure!

[sugilite:Me]

If you want more, gear it down.

[YellowDog]

I have a mate who put lower profile tyres on his FJ1100 becuse it gave him an extra 8-12kph on the speedo. In reality he would have been going slower, not faster.

I got him to run the mod past the dealer who told him that lower profile tyres were not safe for all riding conditions. All this so the speedo can show a few kph more at top speed!

Be careful out there.

[Mikkel]

I have a mate who put lower profile tyres on his FJ1100 becuse it gave him an extra 8-12kph on the speedo. In reality he would have been going slower, not faster.

I got him to run the mod past the dealer who told him that lower profile tyres were not safe for all riding conditions. All this so the speedo can show a few kph more at top speed!

Be careful out there.

Why would you want to do that?

Making videos for Youtube?

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.

[yod]

ive tested a few cars and bikes against my GPS at various speeds - every single one was reading high

[R6_kid:Me]

I had my '99 R6 out to 267kmh and was only just creaping a kilometer every second or two at that speed and there was a corner fast approaching. This was on stock gearing.

On the dyno it put out 92.8hp or so, and 'only' got to just over 240kmh as indicated on the dyno.

At the end of the day it's not the kind of thing you do all the time anyway, but still interesting to know all the same.

[Krayy]

'indicated' has so many varibles, that it'll never be anywhere near what you're actually doing. I managed to hit the rev limiter in 6th on my 636, out the back of Puke. The 'indicated' speed was reading 287...

How the hell can you look down at the speedo when doing 287 km/h?

I'd be shitting myself.

[onearmedbandit]

never understood why it's so hard to get the rev counter accurate tho. The R6 one I can kind of understand, cos they were boasting about a massively high redline, when really, most of it was on paper, but the other bikes.. can't be that hard to measure!

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.

[mynameis]

Someone explain the maths behind indicated vs actual speed to me please?

[onearmedbandit]

Maths? There is no 'maths' behind it as such. The reasons can be mechanical error (unintentional) or simple over reading from the marketing guys (intentional). How many people actually know just how fast they are going? Fuck all, so if you are trying to market your bike as the fastest who will it hurt to have the speedo reading a bit high? Certainly not your sales. Same as revs. Same as weight. These are performance bikes, we want the fastest, lightest and most advanced available. So some figures get smudged.

[mynameis]

Maths? There is no 'maths' behind it as such. The reasons can be mechanical error (unintentional) or simple over reading from the marketing guys (intentional). How many people actually know just how fast they are going? Fuck all, so if you are trying to market your bike as the fastest who will it hurt to have the speedo reading a bit high? Certainly not your sales. Same as revs. Same as weight. These are performance bikes, we want the fastest, lightest and most advanced available. So some figures get smudged.

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

[onearmedbandit]

Exactly. How many times have you heard someone saying something like, 'Oh I was pulling 220 out of that corner' or 'I put the frontr back down at 180'? We've all said something like that, because we all use our speedo as the measurement. But we were all wrong.

[Pwalo]

Don't forget that even after the vagaries of speedos and tachometers, you also got the variable of tyre size, weather conditions, rider weight, height etc.

Even identical bikes can have slightly different top speeds (ie not all 2004 GSXRs produced in a certain batch will have identical performance).