[DeTomaso] More cruise control issues

[wkooiman at earthlink.net]

On a manual trans car, you don't use the cruise control as you shift gears.  You put it in top gear, and hit the cruise.  Or, I guess you could put it in a lower gear and hit cruise, but that's pretty stupid.

Since you aren't shifting gears, it should work okay to get a signal from the tach.

-----Original Message-----
>From: MikeLDrew at aol.com
>Sent: Aug 31, 2009 7:56 PM
>To: chrisvkimball at msn.com, detomaso at realbig.com
>Subject: Re: [DeTomaso] More cruise control issues
>
>
>In a message dated 8/31/09 10 05 56, chrisvkimball at msn.com writes:
>
>
>> It seems to me the RPMs would register speed exactly like the drive train 
>> would, the faster you go, the faster the RPMs in any given gear.  Keeping 
>> the RPMs constant would naturally keep the speed constant, too, so  I see 
>> no reason why some kind of signal from the tach wouldn't work as a speed 
>> signal.  Any thoughts?
>> 
>
>>>>Uh....what?
>
>Your theory is correct assuming you have a one-speed car.   There is a 
>direct correlation between speed and RPM.
>
>But for the purposes of a cruise control that uses actual vehicle speed as 
>an input, in a car that has more than one forward gear, RPM is less than 
>useless....
>
>Mike
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