[DeTomaso] More cruise control issues

[Charles McCall]

I'm guessing that using the MSD box will work fine for us, but imagine that
rpm is not speed constant in cars with an automatic transmission. And since
the majority of cars in the US have an automatic, I imagine that their
answer is that it won't work based on rpm..

Just a guess...

On Mon, Aug 31, 2009 at 7:05 PM, Christopher Kimball
<chrisvkimball at msn.com>wrote:

>
> Today I called MSD for some clarification on the wiring of my new
> electronic cruise control, and the tech I got said a few things that made me
> question his expertise, so I thought I'd bounce some ideas off the forum to
> see what y'all think.
>
> Although most of the wiring is now clear to me, the guy said the VSS wire
> must somehow be attached to the drive train.  He said magnets attached to
> the u-joints or a speed sensor in line with the speedometer cable were my
> only options.
>
> I asked if there wasn't some wire I could take from the MSD AL6 box I'm
> using, or the MSD tach adapter I also use, but he said no, it had to be from
> the drive train due to the fact the signal has to do with speed and not the
> tach RPMs.  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?
>
> Have any of you had success with the electronic cruise control, and if so,
> what did you use for a VSS signal?  Is there a metric signal generator that
> will work with our metric ZF speedometer cable?
>
> Thanks for your help.
>
> Sincerely,
>
> Chris
>
>
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