Please tell me what turbo I am running?
Please tell me what happens to MY actuator when vacuum is applied?
Please tell me what happens to my n75 and n18 valves when I use vacuum instead of pressure?
Please tell me you have actually measured 12v at the N75
I've actually tested with vacuum, pressure, and gauges...
David please stop replying to all of my posts anywhere. Your posts are useless.
Useless... excuse me, but ***? I don't want to sound arrogant here, but I'm trying to help you, as are the other people here. I have over 20 years experience with TDIs and know the electronics of TDIs inside and out. You can keep on asking questions, but if you don't like the answers that everyone is giving you, you should stop asking them or take their advice as they are correct.
- Please tell me what turbo I am running?
If stock AHU/1Z turbo, then it is a wastegate turbo - it needs pressure to open the wastegate to open it, not vacuum.
- Please tell me what happens to MY actuator when vacuum is applied?
If stock AHU/1Z N75 valve, it doesn't work with vacuum (nor does your turbo).
- Please tell me what happens to my n75 and n18 valves when I use vacuum instead of pressure?
N75 - won't work with vacuum, you need an ALH/BEW N75 for it to work with vacuum.
N18 - will work the way it is supposed to as all N18 valves are vacuum based. N18 valve will NOT work as an N75 valve.
- Please tell me you have actually measured 12v at the N75
N75 have two wires. One goes to pole 87 of the Power Supply Relay and that is *always* battery voltage when the ECU is on. The other wire goes to the ECU, of which the ECU will switch it to ground when it wants to turn on the N75 valve and disconnect it from ground (float) when it wants the N75 valve off. It rapidly pulses the N75 valve many times a second in what is known as a pulse width modulation. This PWM duty cycle is what you see in VCDS represented as a percentage. If you put a voltmeter on it, it will read from 0 to 12V depending on the duty cycle. If you look at it on a scope you will see a nice 12V square wave of varying frequency.
Enjoy my useless post.