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What are those numbers on the left of the
A: They are the scaling numbers. They define the min and max
values that will be graphed in the window. For instance, a
temperature could be graphed between -10 and 130*C.
Q: Great, but I don't
like the current ones.
A: Don't worry, everything is fully
customizable. You have two different ways of choosing your scaling
In the preferences screen,
you can either modify the values for existing units, or add a
new unit with its values. Make sure the unit is spelled exactly
(including the case) as it appears in the measuring
In the main screen, click on
a field (or use the blue horizontal arrow) to display its
scaling values. The field you're working on is surrounded by a
frame. You can then change the min and max scaling factors for
this particular field
Both settings are saved, so
that next time you won't have to do it all over again!
Q: So what's the
difference between these two different ways?
A: First, you need to
understand how the values are stored/retrieved. When Vag-Scope
graphs data from a controller it doesn't know, it applies the
values in the preferences screen, for the units that are defined.
If a unit is "unknown", the min will be 0 and the max will be 100.
Setting the values in the main
screen allows you to override these defaults. For instance, let's
say you set the rpm (/min) value in the preferences screen at
7000. This is fine for gasoline engines. But a friend visits you
with his TDI. What you do is you set the /min fields in the main
screen at 4500, to keep a good resolution in your graph.
that point, as soon as you stop graphing, the values are stored in
the "scaling" directory, in a file named by the controller part
number. And next time you connect to the same controller, Vag-Scope
will automatically remember your settings.
the deal with the horizontal scaling?
A: This enables you to tell Vag-Scope the value of the horizontal
shift (in pixels) each time a new sample is delivered by VAG-Com.
This is customizable because of the range of sample rates you can
experiment with vag-com: you can go from 10 samples per second on
a '02 A4 3.0Q (engine, 1 measuring block at a time) to 0.4 on a
Eurovan (transmission, 3 measuring blocks). The default is 3, but
you may want to increase it if your sample rate is low to make your graphs will be more readable.
This value is also saved
automatically for each control module.
Why do I have a big
blank after I hit "pause"
in live mode?
A: This is intentional. It shows the graph has been paused and
avoids having a big discontinuity in the curves (for instance
going from 800 to 7500 rpm in 0.2 second...).
The "pause" button can be handy
to make screenshots of a particular situation, like a boost spike
Q: VAG-Scope says "unexpected end
of values". What's
A: At this time, Vag-Scope does not support appended log files.
More precisely, it will only read the first part of them. The
solution is to give your files a more specific name than
"This is not an original VAG-COM
A: Guess what, you altered the file in some way. For instance,
just reading and saving the file in Excel adds comas to it, and
this is what VAG-Scope relies on to parse the file. Solution: make
a copy of the file before you edit it with a program that modifies
Q: I'd like to write my own VAG-Scope.
Is this possible?
A: Yes, that's one of the reasons why VAG-Scope is open source
(the other being we don't want to be bothered by 10 different
feature requests a day). VAG-Scope was written using MS Visual C++
6 and you will find the source code
Feel free to improve/write your own VAG-Scope and publish it.
Obviously your file has to be called VagScope.exe so that VAG-Com
can "spawn" it.
But I can't
program/all I know is VB!
A: Then stop complaining or learn! ;-)
Does VAG-Scope work
with the Shareware version of VAG-COM?
A: Yes, but only the first field in each measuring group is
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