[DeTomaso] More cruise control issues

Sun Sep 6 06:08:25 EDT 2009

I don't know the characteristics of the sensor SOB sent you, but if it 
is like the three wire VDO hall sensor I'm using for my EFI, then the 
output signal is an open collector signal, and it needs a pull-up 
resistor to work properly.

Bill should know and chime in.

Cheers,
Thomas

Christopher Kimball skrev:
> I do have the old style speedometer, but it sounds as if the unit you have is almost exactly like the one SOBill sent me to try out--same installation and same three-wire hook up.  
> 
> If it were putting out frequencies that were too fast or to slow, that would probably mean the cc unit just wouldn't work at all, wouldn't it?  I don't think a steady signal, even at the wrong frequency, would cause the cc unit to suddenly accelerate.  But then, these days I'm having to ask my sons how to work my computer.  The last time I took any electronics classes was in my first year of college, back when Bill Gates was only, well, in college!
> 
> Sincerely,
> 
> Chris
> 
> 
> 
>   
> 
> From: cdifani at comcast.net
> To: chrisvkimball at msn.com; sobill at aol.com
> CC: detomaso at realbig.com
> Subject: Re: [DeTomaso] More cruise control issues
> Date: Sat, 5 Sep 2009 22:24:12 -0700
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Chris:
>  
> Having been away from the computer lately, I'm not 
> quite "up to speed" with your current Cruise Control Adventures (CKCCA for those 
> of us who enjoy acronyms).  And that also means I'm not aware of the 
> details of the "sending unit" that you received from our very own electrical 
> wizard (which would be EWSOB, or possibly The EWSOB).  In any 
> case, I thought that possibly you might like to try my VSS generator.  The 
> only caveat is it requires an electronic speedometer, rather than the ubiquitous 
> mechanical Veglia.  The advantage of the electronic is you can calibrate it 
> yourself, with any handy "known" 2 mile stretch of highway.  
>  
> However, even if you don't have a 20th century 
> electronic speedo, at least you would be able to determine if the VSS is the 
> root of your troubles.... or not.  It installs into the ZF's speedo cable 
> connection, and then you run three wires to wherever you need the signal.  
> Ground, 12VDC+, and the signal.  With our ZFs, this converter provides a 
> square wave signal that all the new electronics devices need in order to 
> recognize rotational speed.  The converter for our ZF's is the Speed Sensor 
> HE22C.  
>  
> The other piece of information that you need is the 
> frequency of the HE22C.  This is needed so it will interface with your CC 
> correctly.  The HE22C generates 16 pulses per revolution, in a square 
> wave.  This somewhat/kinda/mostly/generally/maybe equates to 25,600 pulses 
> per mile. 
>  
> Again, if you want to try my square wave generator, 
> I'll be glad to mail it up to you... 
>  
> Chris
>  
> Chris Difani
> '73 L #5829 "LITNNG"
> The Electric Pantera
> Sacramento, CA
> Email: cdifani at comcast.net 
>  
> 
> 
> 
>  
>  
>  
>  
> ----- Original Message ----- 
> From: "Christopher Kimball" <chrisvkimball at msn.com>
> To: <sobill at aol.com>
> Cc: "Pantera List Serve" <detomaso at realbig.com>
> Sent: Saturday, September 05, 2009 7:46 
> PM
> Subject: Re: [DeTomaso] More cruise control 
> issues
> 
>> Dear Bill,
>>
>> I received your sending 
> unit today (thank you) and installed it for the test run, but what happened when 
> I tried operating the cruise control was quite a surprise, to say the 
> least.
>> When I pushed the "set/accel" button on the dashboard 
> control, the car floored itself and took off like a rocket until I hit the 
> brakes so as not to rear-end the car several hundred yards ahead of me!  I 
> tried several more times, only to have the same thing happen.  Only once 
> did it begin to act remotely like a cruise control, but then it acted like I was 
> flooring it, letting off on the gas, then flooring it again, and so on.  
> That only lasted a few seconds before it turned itself off.
>> The 
> Dakota Digital technician with whom I spoke said I should hook the tach wire 
> from the cruise control box to the wire that goes directly from the 6AL box to 
> the tachometer.  Since I'm using a tach adapter, however, I'm thinking 
> maybe the problem is that I should be hooking the cruise control's tach wire to 
> the tach wire coming from the 6AL box before that wire goes into the tach 
> adaptor.  The tach adaptor's signal may be unrecognizable to the cc unit, 
> but maybe the unadulterated signal from the 6AL is what the cc is looking 
> for.
>> Or, it could be the guy I talked to gave me the incorrect 
> switch positions for the 12 tiny switches inside the cruise control brain.  
> After all, I did get completely different answers the two times I called 
> technicians at Dakota Digital about my cruise control hookup questions.
> 
>> Any thoughts?
>>
>> Sincerely,
>>
>>
> Chris
>>
>>
>> From: SOBill at aol.com
>> Date: Thu, 
> 3 Sep 2009 11:28:44 -0400
>> Subject: Re: [DeTomaso] More cruise control 
> issues
>> To: chrisvkimball at msn.com
>>
> 
>>
>>
>>
>>
>>
>>
>> The 
> lower right corner of the attached diagram has the electrical 
> connections: Red = ignition switched 12V; White = VSS signal; White/Black (or 
> 
>> just Black) = Ground.
>>
>> Feel free to use 
> it.
>> Have fun,
>>
>> SOBill 
>>
> Taylor
>> sobill at aol.com 
> 
>>
>> In a message dated 9/2/2009 11:27:30 P.M. 
> Pacific Daylight Time, 
>> chrisvkimball at msn.com 
> writes:
>> Great!  I just installed everything except the sending unit 
> 
>>  (which, of course, I don't have yet) and tomorrow morning I'll 
> call MSD with 
>>  my last two "where do these wires go?" 
> questions.  I believe I read that 
>>  the sending unit needs 
> +12, ground and the VSS wire, three total, so I'll run 
>>  those 
> tomorrow night and have it all ready to go by the time the sending unit 
> 
>>  arrives.
>>
>> Is it OK if I try it out, or would you 
> feel more comfortable 
>>  if I just made sure it fit the threads and 
> then sent it back?  I assure 
>>  you, if anything happens to it 
> that causes any damage at all, I'll replace it 
>>  
> immediately.
>> I really appreciate your help; this is very kind 
> of 
>>  you.
>>
>> Sincerely,
>>
>>
> Chris
>>
>>
>>
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-- 
Real life:   Thomas Törnblom             Email:  Thomas.Tornblom at Hax.SE
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