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Yes, delayed downshifts used to be designed in.......
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Posted by MI-Roger [Email] (#882) [Profile/Gallery] (more from MI-Roger) on Fri, 11 Sep 2009 17:02:24 Share Post by Email
In Reply to: Re: Very sad, oldsaab, Fri, 11 Sep 2009 14:51:42
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Even back when automatic tranmisisons relied entirely upon hydraulic line pressures for control, they were "programmed" to not downshift at high speeds in response to driver gear selector inputs until the RPM's dropped to safe levels.

Slamming a gear selector from Drive to Low at highway speed would result in the tranny dropping one gear only. The shift to Low was delayed by the centrifugal governer until RPM's decreased to point where the tranny would not be destroyed by down shifting.

I have no memory of what shifting into Neutral at high speed would do. Would the tranny respond or not?

In today's age of electronics and software control, it is possible the transmission would ignore any command to shift into Neutral at speed.

But on a Saab note; will the new 9-5 also have a three second delay for turn off? Is this common with other brands using start buttons rather than ignition switches?

posted by 24.23.71... 

_______________________________________
Saabs owned:
2008 9-5 Aero Sedan, sold at 227K miles
2006 9-3SC 2.0T - Wife's daily driver
2000 Viggen Convertible - Sold May, 2022
1964 Quantum IV Formula Car - Retirement project
2000 9-5lpt Sedan, sold at 318K miles
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