On 30/03/16 23:16, Roger Mills wrote:
On 30/03/2016 18:39, Dave Plowman (News) wrote:


We're not talking 0-60 times here. Just the best rate of change of speed.
No vehicle with an IC engine gives a linear rate of increase in speed
from
0 to top speed. It will obviously produce the best acceleration in the
lowest gear, slightly less in the next one up, and so on. But that is a
red herring as regards when the engine produces the best acceleration in
any one gear.


OK, can we agree on this?

In a given gear, the maximum rate of change of road speed will be
achieved at the engine's maximum torque speed. The road speed at which
that occurs will be determined by the engine speed and the gearing.

At a given road speed, the maximum rate of change of road speed will be
achieved at the engine's maximum power point. The necessary gear ratio
to achieve this will be determined by the chosen road speed and the
engine's maximum power speed.

Yes or no please - no equivocation!

Yes.


--
You can get much farther with a kind word and a gun than you can with a
kind word alone.

Al Capone