On 31/03/16 15:39, bert wrote:
In article , Roger Mills
writes
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!
I did a little test with my Defender which has max torque at about 2000
rpm and max power at about 3500 rpm.
Going up the gears and accelerating as fast as I could I never got
anywhere near max power in any gear before I could feel the acceleration
dropping off.

That is not the ****ing point, The point is whether or not changing up
to the next gear and dropping the revs lost even MORE acceleration.


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