Re: 200tq problems, WG LED

["Scott M." <scottmo@teleport.com>]

Looks like someone is making a Mockery of the situation as
usual.....oh wait, thats me.....

> > So far, the best diagnostic tool I have seen is a
>> little harness made up by  Scott Mockry.  This fits
between the wastegate
>> frequency valve and its  connector, with a long lead
taking a LED into the
>>cabin.  <snip>. So if you hammer the foot down, the  LED
should flash.  <snip>

> This I am interested in. What are the plans for building
>this thing  and what cables on the WGFV should be
connected up?

The LED with series resistor is  connected in parallel
across both Waste Gate terminals. This LED setup is similar
to the US 1115 test light used in the Bentley.  If you get
two female and two male crimp connectors like the original
bullet shaped connectors you can make a little harness that
has two wires that plug onto to the Waste Gate solenoid and
two that plug into the original two pin wiring connector
along with the LED connected across these two terminals. 

If you make the wires long enough connecting to the LED you
can
locate the LED under the wiper blade and view it during a
test drive.
Works best at night....

The LED normally needs a 500-1k ohm resistor in series to
limit the current, most LED's operate with 10-30milliamps.
The lower the resistance the brighter the LED, up until the
point the smoke gets out. There are some newer "Super
bright" LED's that should work great.

Trivia quiz: Does anyone remember how the Light Emitting
Diodes (LED)  produce light? No credit if you have to look
it up......

Crude asci art for test harness

WG solenoid    WG connector   resistor
  
WG+-------------WG-C+-----/\/\/\/\/\/\---LED +

WG- -------------WG-C- -----------------LED -

I normally use two different colored wires similar to the
original wiring, green/yellow stripe is the ground provided
by the ECU (varying duty cycle) and blue/black stripe which
is the steady +12V. The LED is polarity sensitive. It won't
hurt it if you connect it backwards, it just won't make no
light.....the resistor can be connected in series on either
the + or - wire to the LED.

I can make up some of these for anyone if they don't want
to bother.....let me know.

Thanks to Scott Justusson, some years ago.......... for his
idea to use the LED  to check and adjust the waste gate
spring tension for best operation in unison with the ECU
and its new boost map.

Cheers
Scott M.
scottmo@teleport.com
89 200TQ
ChipFlippinGipper