View Full Version : N75 Question !

06-03-2007, 06:56 PM
Is there some resistance the N75 should be reading off the car ?

Like if i jus hold it in my hand, and put a meter to the 2 leads on the n75, am i supposed to get a certain reading from it ?

Input appreciatd, thanx guys !

06-04-2007, 05:54 AM
This is from ELSA:

Test sequence

‒ Switch ignition off.

‒ Disconnect connector at solenoid valve for boost pressure regulation.
‒ → Measure resistance between terminals of valve.
Specified value: 25...35 Ω
If specified value is not obtained:

‒ Replace wastegate bypass regulator valve -N75-.

06-04-2007, 06:53 AM
Okay, so i can measure it while the hoses are connected to it on the car ? All i have to do it take off the connector and see what measurement i get i guess

I replaced mine, but i dont think its working properly, anyway of chking my old one to see if it is faulty ? Which is out of the car ...

06-04-2007, 06:57 AM
100$ says you installed it wrong. They hardly ever go out electrically, its 99% mechanically or improper install.

What are you boosting like?

06-04-2007, 09:26 AM
How can i have installed it wrong ?

I took the old one out, and i put the hoses back in the same places as the old one.

I dont have a boost gauge, but when i hit like 1800 rpm, the who car jerks one time then keeps on going.

I put the new N75 in and its doing the same thing

06-04-2007, 09:41 AM
did you buy it new. i bought a used one from a junkyard and i had to clean it out before the it would accutate. a good way to check it is to connect it to a 12v source and see it if clicks

06-04-2007, 09:43 AM
Fuel cut??

06-04-2007, 09:45 AM
I bought it new from Audi

06-05-2007, 09:48 AM
I measured my old N75 off the car, and i measured at 29ohms, and i applied 12v to it and i can hear a clicking noise

Does that means its ok ?

06-05-2007, 10:09 AM
Is it the same valve? When you switch some N75 valves they do not get installed in the same orientation as the factory one, just FYI. And I'm 99% sure its not an electronic issue, when they go out it is the mechanical part...

06-05-2007, 02:52 PM
when you hear the click thats the relay accuating so the electrical is fine, but like 98a4 said it could be a mechanical problem with n75. i would almost look else for the problem. vag it if you can

06-06-2007, 06:17 AM
vag shows turbo boost valve, and i also have a manifold vac leak some where apparently !

06-06-2007, 07:22 AM
What exactly is your car doing when you try to boost?

06-06-2007, 12:58 PM
i was also thinking of changing my N75 because i get all paranoia if i hear the people here talk about stuff that can make your car run not 100%.. then i hear the n75 story and think... darn i need that.. :)

06-06-2007, 03:45 PM
What exactly is your car doing when you try to boost?

Ok , so what my car is doing is,

Lets say im going low speed in a high gear, if i hit the gas down hard, the car reaches 1800rpm , and the jerks like somethings gonna break, and then jus keeps on going.

Its like the whole engine shakes or something , kinda like the turbo is tryin to kick in but cant ...

Could this be a boost leak ?

I can tell my acceleration is gone down too, dont pick up as fast as it should, my chk engine light is on and it came up as 2 errors, boost valve and manifold leak.