[DeTomaso] More cruise control issues
Christopher Kimball
chrisvkimball at msn.com
Tue Sep 1 13:08:04 EDT 2009
That's what I was thinking--which tach wire should I use? I have a special tach adaptor that goes between the MSD 6AL tach output and the tach itself. Do you think either wire, the one from the MSD to the adaptor, or the wire coming out of the adaptor to the tach, would work? I don't want to hook something up incorrectly and mess up something.
Also, SOBill has an adaptor that goes right on the speedo cable, so maybe to be safe I should use that?
Sincerely,
Chris
> Date: Tue, 1 Sep 2009 11:59:36 -0500
> From: wkooiman at earthlink.net
> To: MikeLDrew at aol.com; chrisvkimball at msn.com; detomaso at realbig.com
> Subject: Re: [DeTomaso] More cruise control issues
>
>
> 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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