Anyone know how the sport button affects a dyno curve from a Cooper D?

Has anyone ever posted a image from two dyno runs?

Doesn't the sport button just affect the engine by changing the throttle action - less pedal required to give more 'throttle' opening?

So since a dyno curve is run at full throttle throughout, the curve won't be changed by the sport button.

Andrew

Na! - in my experience a dyno curve is done through the rev range of the engine under test. The few dyno runs I've had done (bike!) have all shown the curve from a few revs up to the red line - you get to see the power output at all revs - thats the curve. Tweak the fuelling here and you'll see a change in the power output, tweak it there and the curve will change again. You get to see that the max power (and torque) occur at certain points, the shape of the curve and so on. If all that the sport button is doing is just giving you a quick action throttle then it's doing nothing really (but I see your point!) and the tightening of the steering wheel feel is the same - p155 poor value for £90 quid then! I actually thought it changed the fuelling map!

The few dyno runs I've had done (bike!) have all shown the curve from a few revs up to the red line - you get to see the power output at all revs - thats the curve.
Yes, but the power output at each revs is with the throttle wide open - full throttle at lower revs is achieved by just screwing down the brake (a dyno is basically just a big brake connected to the rollers).

The 'Sport' button is like many extras - it's the manufacturer's way of getting money from those punters willing to pay while not putting off those who won't pay. Loads of Mini 'extras' cost BMW nothing - like the trip computer that exists in all cars, but if you don't pay BMW for it, they disable it (except when the tank is nearly empty, when the remaining range starts working...).

And for a bigger example, look at a Mini One or a First - they are 99% a Cooper and probably cost BMW within £20 of the price of a Cooper to make. They are sold for thousands less by BMW not making much profit - but as long as it doesn't cost BMW a Cooper sale, any Mini sold at a small profit is better than no profit at all.

The price of an extra is determined by what Mini think they can get us to pay and is often completely unrelated to what it costs to make/fit the extra. That's business.

Andrew