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[Richard230]

According to a the following statement on page 22 of the March issue of Popular Science, electric vehicles (not necessarily motorcycles) may have a transmission in their future.  Here is the statement:

Single-speed EV transmissions will give way to two-speed units within 5 to 6 years, according to German supplier ZF.  As with gas powered cars, adding more gears to electric motors will make them more efficient, extending their range by up to 20 percent.

Note that ZF makes transmission for many brands of automobiles and has done so for years. I believe that they also make (or used to make) transmissions for some motorcycle brands, such as BMW. 

[benswing]

Tesla tried a 2-speed transmission with their roadster.  It failed and they never looked back.  Now they have the quickest production electric car with the longest range. 

Unsurprising that a transmission company would think they are a good idea putting them where they aren't needed.


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[RNM]

Because they don't have transmission, Tesla produces the world's slowest cars with 700hp (topspeed)

[Doctorbass]

According to a the following statement on page 22 of the March issue of Popular Science, electric vehicles (not necessarily motorcycles) may have a transmission in their future.  Here is the statement:

Single-speed EV transmissions will give way to two-speed units within 5 to 6 years, according to German supplier ZF.  As with gas powered cars, adding more gears to electric motors will make them more efficient, extending their range by up to 20 percent.

Note that ZF makes transmission for many brands of automobiles and has done so for years. I believe that they also make (or used to make) transmissions for some motorcycle brands, such as BMW.

Where is your source? I just can't find teh article on popsci...

Doc

[Doctorbass]

Because they don't have transmission, Tesla produces the world's slowest cars with 700hp (topspeed)

ugh?

Please post your comparaison list...  from what i know it beat the Envador and many otehr cars.
next will be to see it against a Nissan GTR.. same hp, same AWD, but tesla have 1000 pounds more and more torque...

Doc

[RNM]

Doc, I wrote topspeed

[Doctorbass]

Doc, I wrote topspeed

lol.. sorry... some say slow when HP are low or drag time are slow..

But in fact the P85D are 450hp.. not 700.. the anounced 700hp is in fact the rating of both motor combined not the power that goes in...

Doc

[Richard230]

According to a the following statement on page 22 of the March issue of Popular Science, electric vehicles (not necessarily motorcycles) may have a transmission in their future.  Here is the statement:

Single-speed EV transmissions will give way to two-speed units within 5 to 6 years, according to German supplier ZF.  As with gas powered cars, adding more gears to electric motors will make them more efficient, extending their range by up to 20 percent.

Note that ZF makes transmission for many brands of automobiles and has done so for years. I believe that they also make (or used to make) transmissions for some motorcycle brands, such as BMW.

Where is your source? I just can't find teh article on popsci...

Doc

Page 22, lower left-hand corner, under a faded red #1.

[protomech]

lol.. sorry... some say slow when HP are low or drag time are slow..

But in fact the P85D are 450hp.. not 700.. the anounced 700hp is in fact the rating of both motor combined not the power that goes in...

Doc

The dashboard on the P85D reports 450 kW discharge at maximum power.

A two- or three-speed transmission allows you to pick the most efficient of two or three operating points for the motor. A dual motor system also allows you to do this, if either motor / axle can be powered.

High-performance transmissions aren't exactly lightweight. Here's a AWD transmission for a 500hp GT-R weighing in at 326 lbs. A 2WD transmission like the ZF 8HP90 in the Dodge Hellcat weighs 205 pounds "without ancillaries".
http://www.2009gtr.com/2008/02/r35-gt-r-transmission-weight.html

In comparison, the front motor and gear reduction on the P85D and S85D weighs around 200-250 pounds as well.

A two- or three-speed transmission also allows you to pick the highest power output of two or three operating points for the motor. A dual motor system doesn't do this - you get whatever both motors can output - but the peak output is higher. A P85D will probably still out-accelerate a P85 w/ two-speed gearbox until well over 100 mph. The gearbox car might not even catch the P85D until the P85D reaches 155 mph and stops accelerating.