I think we all believe you Simpson that the dash shows 160, but Triumph themselves claim the 675 is only good for 155mph, and lowering the final drive would lower the top speed, not raise it.
Yeah. Unless my calculations above have a mistake in them, I would say that your calibration correction is still out some. I came in at 153mph, and so if you're -1/+1 then you should be less than that. **edit** so i just adjust the above calculations using -1/+1 and it came out at 147mph. Those calculations have lost a load of precision along the way too (to save me writing down and calculating long numbers at 02:00 in the morning ), so I would guess that at -1/+1 your real top speed is more like 144mph.
People reckon the Striple over reads by 6% on standard gearing and more than 10% with -1 on the front. I don't think it impossible that a true 159 could be achieved-lower gearing drops the theoretical top speed -meaning the mathematical calculation of max revs/road speed. It may be that 155 is not at the limiter but as many revs as the engine would pull. Higher figures may be speedo error
I guess lower gearing could allow the engine to hit the limiter in top gear....I did read of someone with a TT600 who lowered his gearing and the bike gained top speed due to this.
Ok, so using triplex's maths but for my situation (-1+1 and ramming off the hard limiter at somewhere in the region of 14.5krpm in 6th) I calculate my Vmax(theoretical) to be 167.34mph so +/- 5% error brings it into line with my seen 159mph on the dash... Then there is also heat expansion, running gear condition, hotter air creating a steeper tyre profile which your equations do not account for...
Is the limiter @12700 rpm? Because those sums were the theoretical max speed, assuming you hit the limiter in 6th gear.
2006 Daytona 675 stock limiter is 13325rpm... 09-> is higher (13.7krpm IIRC)... but I looked down and thought my bike is at 14,5krpm and you could feel it ramming against the limiter and I thought better of raping it for so long at those kind of engine speeds.
Is the rev limit in the map? because I'm sure I never get anywhere near 14k. Maybe tuneecu will tell me if I plug it in. I'll be happy if the limit is higher because then that makes gaining some extra hp more worth it.
The rev counter may also over read-people have posted revs reached which are beyond the limiter. It is an analogue read out of a digital signal and Kawasaki had a period of being notorious for this kind of "tuning"
The heat expansion, etc, would be insignificant if you calculate how much growth you'd need for a few mph. An extra 1k+ revs would obviously be very significant though!
Hey, simpsoni.. did you say 159? I just found gearingcommander.com and loaded the daytona gearing, andjusted the sprockets, and set the max revs to 14500, and it came out to spot on 159mph!
I wouldn't read too much into what Gearing Commander says. Unless you believe my bike in stock form at redline will do 182mph??
The other thing is that if you stick your bike on a dyno or something similar, something that can do an accurate readout of your revs, you'll see that the rev counter is almost as duff as the speedo!
Previous was a 146 so happy with this. Although the bike was rolling on quite nicely and I think would easily of gone over 160 but common sense kicked in unfortunately. Must say, it makes such a difference getting your chin on the tank and you head and limbs tucked in. Hopefully going to Mugello next year so I will have a proper go on the Autobahn rather than on the private bit of road I used over here! :?
