I have two n75 valves. Im not sire which to use.
They both provide slightly different boost patterns.
My original valve is older, and had the screw played with some.
It gives more boost early on, but is more rough.
I also have a fresh new valve that runs very smooth but makes little boost down low, and more peak boost.

I was going to get a tune file from user “marty”

Im wondering which valve to go with.

Will the tune even care which n75.  Or does the new tuning overwrite then75 effects anyways?

2001 tt 225 amu

stop fucking around with fucked up n75s that some dipshit thought they could fix.

get a stock one, start with that.

So does this mean that the software somehow knows the difference in n75 valve?
How can the software know that there is a mechanical change (valve)?

I'm a noob so correct me if I'm wrong but I thought it goes like this:
Software does " requested boost"  , mechanical n75 talks to wastewater, then you get "actual boost"

There are maps that govern assumptions on how the N75 behaves


No. Not even close.

A better analogy is a thermostat. How does your heater know how to get to a certain temperature?

They should determine it, not you, based on the compressor map of the turbo you intend to use


No. The brand of thermostat you use does not determine the temperature of your house.


There is nothing in either of those two paragraphs that makes any sense.

Get a functioning n75, one that has not been fiddled with by a windowlicking moron or sold as an "upgrade" by a fucking scammer.

Then the ECU needs to be tuned properly for that N75 to make the boost that the ECU requests.

There are two different functions in the ECU

1) determining target boost (this is has nothing to do with what N75 you are using)
2) controlling the n75 to achieve that goal (this depends on the target boost and the kind of n75 you are using)