Re: A simuv2 backport of the clutch/gear-change inertia fix

Here's a fix of the issue that Andrew discovered in his testing, again 
backported from simuv3.  It is simply a fix for the engine break and 
fuel consumption calculation (rather than having the engine break simply 
proportional to the maximum engine torque at each rpm, it is a linear 
function of the torque produced at maximum power - this means that there 
is always some engine break, and it is always higher at higher revs). 
Incidentally, this fix also corrects the 'consuming a negative amount of 
fuel when not accelerating' bug.

Andrew Sumner wrote:
> Ok, I think I've found a bug.
> 
> Accelerate up to third gear, then get the revs nice and high.  Change
> down to 2nd and the revs will be well above the redline.
> 
> The bug is that the car isn't slowed down by the gear until the rpm
> drops below the redline, and then suddenly the gear takes effect.  Until
> then it just slowly drops in speed as if the car was in neutral.
> 
> cheers
> Andrew
> 
> 
>

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