Re: E28 Acceleration?

[Jim Cash <j.cash@xxxxxxxxxxxx>]

Mark writes:
>     I'm puzzled at this point, and wonder if anyone has any advice.  I
> have an '84 528e (manual).  When I am cruising at say 55-65mph and let
> off the gas, instead of smoothly decelerating, my car tends to drop-back
> suddenly before leveling out.  I'm pretty sure that there's something
> preventing a much smoother transition.  If you take your foot of the
> gas, shouldn't the engine maintain a smooth decline, rather than this
> distinct drop-off?  Any clues or recommendations would be appreciated.



Mark

This is designed to work this way. It is different than other cars that
let the engine idle as soon as you take your foot off the gas.

Whe you take your foot off the gas it is a signal that you want to slow
down.  As long as the engine speed is above 1000 rpm, it knows the
engine will not stall, and therfore it uses full engine comprssion for
braking (slowing you down).

It does this by cutting off "all" fuel supply (cuts the injectors).

I much prefer this as you get better control - depending on how you come
off the throttle.  This is especially useful in stop and go traffic -
not as much use of the brakes.

It's what I call "bi-directional throttle response".

With practice you begin to use the throttle for both accelerating and
slowing - differently than you do in other cars.  Now when I drive other
cars I sometimes forget and find myself closing on slowing traffic
because I am not slowing as I am used to.

Cheers

Jim Cash

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