Re: Purpose of freewheel for Saab trans - Saab Sonett Bulletin Board - Saabnet.com
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Re: Purpose of freewheel for Saab trans
Posted by Jim Williams (more from Jim Williams) on Mon, 25 Sep 2000 13:14:06
In Reply to: Re: Purpose of freewheel for Saab trans, Jason, Sun, 24 Sep 2000 23:24:41
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As for the shifting, what I gather is that after cresting a hill in 3rd gear, you ``engage'' the freewheel (disengaging the engine from the transmission.) At that point you are free-rolling, much like you would be if you had the clutch in or the car out of gear. You could then, upon coasting up another hill, put the car into second, put in the clutch and ``disengage'' the freewheel (re-engaging the engine with the trans.) This would involve the shifting that we are discussing now.
That's NOT what Saab had in mind! The idea was that you'd leave the car in 'freewheel' mode (able to coast with the engine dropped to idle) basically ALL the time. They didn't intend that you'd be engaging and disengaging it frequently -- it was supposed to be more of a 'set-and-forget' feature. (That's why they made the control a not-very-convenient knob under the dash... they didn't expect you'd use it very often.)
In fact, the only reason they made a provision for disengaging freewheel mode at all was the knowledge that engine braking was needed for safety reasons in some kinds of driving (e.g. steep mountain driving, so you wouldn't overcook the brakes) or if you had to push-start the car. In these cases, they expected that the driver would plan ahead and lock the freewheel while stopped (for a moment of prayer?) before descending the Alp or whatever... then unlock it and return to 'freewheel mode' as soon as the need for engine braking was past.
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