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Scirocco-l Digest, Vol 16, Issue 68 (Gauges)

Subject: Scirocco-l Digest, Vol 16, Issue 68 (Gauges)
From: danws69 at earthlink.net (Dan Snow)
Date: Thu Jun 22 10:06:11 2006
In-reply-to: <006301c6960b$229e6390$b709b9d0@4WAVE>
"I agree with Gordon, that generally speaking an ammeter is pretty useless."


Heh, I could *really* use one in the diesel....

And I agree about the fonts, that's why I like them Audi4000S gauges. Same
font :)

Dan Snow (Tampa, FL)
'87 16v Scirocco
'87 16v    rocco (?-car-trailer)
'82 Scirocco (diesel)(42~50mpg)
'81 Rabbit Sportruck
'87 16v Scirocco (the back-up shell that gives, and gives and gives...)




-----Original Message-----
From: Dan Bubb [mailto:jdbubb@verizon.net] 
Sent: Thursday, June 22, 2006 10:50
To: Jason; Brett Van Sprewenburg
Cc: scirocco-l@scirocco.org
Subject: Re: Scirocco-l Digest, Vol 16, Issue 68 (Gauges)


Yeah, but......
Personally, I like my gauge faces to match and I like the ammeter face to
say "AMPS" and I don't want to have to do a mental conversion from the gauge
number to the actual value. Maybe I'm weird that way.

Maybe I should have said a VDO shunt ammeter costs about 4 times what a
regular VDO ammeter costs. You know, something that I might buy and like to
have in my Scirocco.

I agree with Gordon, that generally speaking an ammeter is pretty useless.
Dan

From: "Jason" <verboten@michiganvw.org>
Sent: Thursday, June 22, 2006 10:35 AM
Subject: Re: Scirocco-l Digest, Vol 16, Issue 68 (Gauges)


> exactly, all ANY meter is is a voltmeter, modified to measure what you 
> want it to by way of voltage ;)
> 
> On 6/22/06, Brett Van Sprewenburg <brett@netacc.net> wrote:
>>
>>
>> You can build an ammeter with a shunt and a voltmeter.  The shunt 
>> costs about $14. Here's a 100AMP shunt:
>>
>> <http://www.allelectronics.com/cgi-bin/item/SNT-100/search/
>> 100_AMP_SHUNT,_50MV=100_AMPS_.html>
>>
>> Here's an appropriate meter to use "across" it, also $15:
>>
>> <http://www.allelectronics.com/cgi-bin/item/
>> PM-122/385/3.5_DIGIT_LED_PANEL_METER,_200_MV_.html>
>>
>> You could also use a DMM to on mV range to calibrate a standard VDO 
>> voltmeter into amps to accomplish the same thing for a more 
>> "portable" approach.
>>
>> ==Brett
>>
>>
>> On Jun 22, 2006, at 10:03 AM, Dan Bubb wrote:
>>
>> > So, a shunted ammeter uses a shunt!!! ;^)
>> > A shunt is a high current, low ohm resistor that is put in series 
>> > between the battery and any load you want to measure. Then the 
>> > meter is wired in parallel to the shunt. So, most of the current 
>> > goes through the shunt but some of the current, in proportion to 
>> > the ratio of the shunt resistance to the meter resistance, goes 
>> > thru the meter. Sounds like a cleaner solution. Unfortunately, a 
>> > shunted ammeter costs about 4 times what a normal ammeter costs!
>> > Does anybody care about this?
>> > Dan
>> >
>> >
>> > From: Dan Bubb" <jdbubb@verizon.net>
>> > To: "GGehrke" <ggehrke@gmail.com>
>> > Cc: <scirocco-l@scirocco.org>
>> > Sent: Thursday, June 22, 2006 9:39 AM
>> > Subject: Re: Scirocco-l Digest, Vol 16, Issue 68 (Gauges)
>> >
>> >
>> > This is my take on an ammeter. All the current needs to go through 
>> > the ammeter for it to measure it. But, I doubt you'd want to 
>> > measure the starter motor draw. That might be enough current to 
>> > melt the ammeter and the wires that run to it. So, you need to 
>> > leave the starter out of the ammeter circuit, but you want to 
>> > include everything else including the alternator output. So only 
>> > the starter motor would connect directly to the positive terminal 
>> > of the battery. All the other connections to the + battery terminal 
>> > would get moved to one side of the ammeter, the alternator output 
>> > would be moved from the starter motor connection to the ammeter and 
>> > the other side of the ammeter would connect to battery +. OTOH, 
>> > there is something called a shunted ammeter. I have no clue how 
>> > that works, but wouldn't mind finding out! Dan
>> >
>> > From: "GGehrke" <ggehrke@gmail.com>
>> > Sent: Thursday, June 22, 2006 9:08 AM
>> > Subject: Re: Scirocco-l Digest, Vol 16, Issue 68 (Gauges)
>> >
>> >
>> >>> Ammeter, you can tell if the Alt is charging correctly or not. 
>> >>> The needle is centered at 0. When you turn the key or put on a 
>> >>> load it swings to the left. When charging while the engine is on, 
>> >>> it swings to the right.
>> >>
>> >> Ah, that makes sense now.  I have an ammeter gauge that I pulled 
>> >> at a junk yard but wasn't sure how to hook it up because ammeters 
>> >> have to go in series.  Surely I couldn't run the car's main power 
>> >> through it, but I figured about the best usage of it would be to 
>> >> monitor some arbitrary system like the headlights or something.
>> >>
>> >> But where exactly do you hook it up?  I'm assuming the blue 
>> >> exciter wire, right?  Cause I know that's what causes the 
>> >> alternator light on the dash to work...
>> >>
>> >>> Vacumn shows the manifold air pressure. Are you using a lot of 
>> >>> fuel or running economically (or have a leak in the 25 YO 
>> >>> rubber).
>> >>
>> >> My BMW has this and literally labels it a "MPG" gauge.  It's one 
>> >> of those things that's just kinda interesting to watch.  I think I 
>> >> have one for my scirocco that I'm going to install if I ever get 
>> >> around to working on the car and not just school stuff :-/
>> >>
>> >> -Grant-
>> >>
>> >>
>> >>
>> >>>> -----Original Message-----
>> >>>> From: Chris Effinger [mailto:chriseffinger22@hotmail.com]
>> >>>> Sent: Saturday, June 17, 2006 12:52 AM
>> >>>> To: scirocco-l@scirocco.org
>> >>>> Subject: RE: Scirocco-l Digest, Vol 16, Issue 68
>> >>>>
>> >>>>
>> >>>>
>> >>>> has anybody put in aftermarket mechanical gauges ( water 
>> >>>> temperature, oil pressure)?, wondering if there's an easy way to 
>> >>>> do it. my 81s originally had
>> >>>> some sort of electrical gauge
>> >>>>
>> >>>> ________________________________________________________________
>> >>>> _
>> >>>> Movies, Music & More! Visit Sympatico / MSN Entertainment
>> >>>> http://entertainment.sympatico.msn.ca/
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>> >>>>
>> >>>> _______________________________________________
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>> >>>> Scirocco-l@scirocco.org 
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>> >>>>
>> >>>
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References:
- Scirocco-l Digest, Vol 16, Issue 68 (Gauges)
  - From: jdbubb at verizon.net (Dan Bubb)
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