powerband ?

[BluePill]

Enjoy! Don't let it bite you... and once you find it... you'll want to hit it every time you take off!

There is a theory called "tangent shifting" that is supposed to keep the motor in the range where it is producing the maximum average horsepower (and therefore maximum acceleration). It depends on the horsepower curve and the rpm drop between gears. To take a simple example, an engine has 80 HP at 8,000RPM, peaks at 100HP at 10,000RPM, then drops to 80 again at 12,000RPM. If the gearing gave you a drop from 12,000 to 8,000RPM on each shift, shifting at 12,000RPM would give you an avearge of 90HP through that range. Shifting at the max. HP of 10,000 would drop you to around 6,000RPM after the shift, and the average HP would be much lower. For maximum performance, I usually shift when I see 12,000RPM on the tach. That keeps me a bit below the limiter.

BTW, I recommend running to the limiter a few times (When safe) so that you know what to expect if it happens. Just like kicking in the ABS on a car, it can be weird if you haven't experienced it.

 

[eucsstamtic]

OK, so not the rev limiter... but really really close.... I'll have to see if I have one.

YouTube - testrun.wmv

note: I always cover my speed... even if I'm under the limit (or just a few mph above)... habits! I left the tach in here.

Nice!!! i see you were gettin on it for sure... have you had any issues with the front end coming up when getting on it like that?

 

[Marthy]

Ok, let's get technical here... This is how we do it in the big league. Each gears have a different shift point. Usually we set up the shift light to indicate the driver when to shift. This will be my recommendation for this bike.
1/2 -> 12000, drop to 8200
2/3 -> 12000, drop to 9500
3/4 -> 11500, drop to 9800
4/5 -> 11000, drop to 9800
5/6 -> 10750, drop to 9800

At the end of the day, you need to get the feel of your bike... they're all a bit different.

 

[dart1963]

Nice!!! i see you were gettin on it for sure... have you had any issues with the front end coming up when getting on it like that?

it can very well get in the air, especially, actually mostly, if you accidentally slip the clutch instead of getting a smooth shift. That's why I rarely take off like that, and most of my shifts are at 7-9k.

 

[dart1963]

Ok, let's get technical here... This is how we do it in the big league. Each gears have a different shift point. Usually we set up the shift light to indicate the driver when to shift. This will be my recommendation for this bike.
1/2 -> 12000, drop to 8200
2/3 -> 12000, drop to 9500
3/4 -> 11500, drop to 9800
4/5 -> 11000, drop to 9800
5/6 -> 10750, drop to 9800

At the end of the day, you need to get the feel of your bike... they're all a bit different.

Nice example of shifting for max performance.

oh, and on the street, by 3rd gear you're up to highway speed!

 

[Marthy]

Nice example of shifting for max performance.

oh, and on the street, by 3rd gear you're up to highway speed!

I agree with you! If I try to do that with my 16/38 I'm already in the 3 digits in 3rd gear. Kind of nice to cruise at 80 mph @ 6000, but I might back up a bit when the time come to change sprockets & chain. 17/44 will be my next one.