Re: boost controller (Larry1.8TTU)
my car is a Passat with AUG engine....like an AWW.
"pot" (in this case
) is short for potentiometer...a variable resistor. 1M = 1 mega-ohm resistance...this means you can adjust it between 0 ohms and 1 M ohm.
they usually have 3 terminals, you connect to the middle terminal and to either one of the outer terminals, then use a multimter to set it to the resistance you want. It's like the device used on your radio for volume control.
here is a link for a picture: http://www.radioshack.com/SupportGate.asp?SupportPage=/support_supplies/doc18/18001.htm
to install, cut the blue config wire, and hook one lead to each end of the two terminals your are using on the pot. very simple to install. I soldered a set of alligator clips to it for quick testing.
I set it to zero intitally, since this is equivalent to having an uncut config wire (0 ohm = a short circuit) Note that 1 M ohms is for all practical purposes an open circuit (ie just like having the wire cut)...you now have a way to set it between "cut" and "uncut".
I verified that the throttle plate closed when set to 0 ohms, then just bumped it up a bit and re-tested, when I saw that the plate was no longer closing, I pulled it off and measured it again (was 50K ohms).
I've since added a quick-disconnect connector to the blue wire, and have replaced the pot with a fixed 47K ohm resistor, and it works great. (much smaller) I'm going to play with the value some more and see how it affects boost/MAF, I have a feeling I can get a bit more out of it without tripping the throttle plate.
There are other types of pots if you want to keep it adjustable, look for a 15-turn trimmer...they are small and are tuned using a small screwdriver. radioshack didn't have the correct one in stock so i went with the bulky type.
Pics/plots will be up tomorrow.