[ausev] High torque or High RPM?

[Ian Ward]

Josh,

You're going to get sick of hearing "it depends", but it is totally true.

Define your expectations for performance in terms of:
- top speed
- range
- acceleration

Then put a cap on the price you're willing to spend (on just the drive
components).

Lastly, throw in any must-haves.  For me, this included regenerative braking
and single-speed transmission.  Neither of these has a huge influence on the
other constraints that I had for the vehicle, but they do constrain your
choices of components.

Weight will certainly play a major role in configuring your 7, but if you're
willing to throw down some coin, there are some screaming batteries that you
can put in it that will give you great weight, performance and life.

At this point, there are no design constraints to make any decisions upon.

- ian

On Dec 5, 2007 1:24 PM, Josh Handel <jhandel at ktomics.net> wrote:

> Howdy all,
>    So I've been piecing togeather my "master plan" and I came to a
> perverbial "fork" in the road.   The vehical I am building will be based on
> a Lotus 7 Clone and is extremely light; so light that many builders of these
> cars use Motorcycle engines & Transmissions in them AND still have a heck of
> a fun car to drive.   This brings up a few questions.
>
> 1) Motorcycle transmissions are designed for higher RPM & Lower torque.
> Given that I have the freedom to choose my transmission for my roadster, is
> there any EV advantage to going with a transmission designed for RPM or a
> traditional RWD Standard car transmission..
>
> 2) How much "extra" weight should I account for in an EV based car (yes
> its all dependent on battery but a ball park).. Lotus 7's can be built ICE
> and weight in at under 1200 pounds.. I am sure I get 2 ~ 300 of that "back"
> for loosing the Gas engine, but how much MORE do I loose to batteries,
> controllers, etc?
>
> Thanks
> Josh
>
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