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[Larry295]

Does anybody know what the actual power converted into hp is for this bike?
Just curious...

[Biff]

Motorcycle.com dyno:

http://www.motorcycle.com/gallery/gallery.php?g2_view=largephotos.Largephotos&g2_itemId=325658

That was a ZF9 I believe, the ZF6 might have a little less due to greater internal resistance in the battery, but that won't make a huge difference. the S and DS have the same power plant, but different gearing, so the peak horsepower on the S is at 28/25* 48.3mph = 54mph.

-ryan

(edited error in my math, corrected speed at which peak power happens on the S, note wheel size will have small effect as well)

[Larry295]

28-25hp for the Zero S ZF6 huh.
And they are saying that the 2013 is 54hp ?? So in essence, we are talking about double the power?!! 
Is that correct? That's gotta make a big difference in the riding of the 13 model then!

[protomech]

Zero's specs for the 2012 are 22 kW (29 hp) and for the 2013, 40 kW (54 hp). Huge power increase.

Peak power point is affected by both the front sprocket gearing and the rear wheel diameter.

I have the nominal tire height for the S and DS respectively at 24.2" and 23.8", but in practice they may be different.

48.3 * (28/25) * (24.2/23. = 55.0 mph.

[JohnSki]

I think you also have to look at the voltage that the motor is running at. Here is a link to a motor that is 30 hp at 72 volts, 54 hp at 96 volts and 62 hp at 120 volts. 

http://www.evdrives.com/product_p/mot-es-31b.htm

Zero could easily change the voltage of the 2013 battery packs and run a very similar motor and achieve these huge increases in hp.  This would mean that if you could get a 2013 motor and put it into your 2012 bike that you are not going to get 54 hp unless you could increase battery voltage.

One thought here could be that Zero might have 62 hp for 2014.