N75 Valves

[Yohan]

Hello,

Car Spec - 1.8T AMK, K04-023, Pipewerx 3" Downpipe c/w 200cell cat, Milltek 2.75" Cat-Back, SFS 3" TIP c/w Jetex Cone, Forge 007, FMIC, 4bar FPR, Samco Vacuum Hoses, Silicone Boost Hoses

I've been doing a lot of reading on these valves and need some feedback from tuners about them.

I had my car R-Tech'd earlier in the year and the map is fantastic, however one day it just lost it's boost spike and max boost.

I boost leak tested it to 25psi and there are NO leaks at all.

My car used to spike 24psi then hold 21/22psi across the range. Now it only makes and holds 19psi across the range.

However!

When I pull the N75 out of the TIP (i.e. the side of the valve that is used for bleeding air in to the tip) and plug the tip, then go for a drive, it makes and holds 22psi across the range.

I don't see how effectively creating a leak would make me more boost?

It's the standard N75 F valve and I'm just wondering if it's broken?

I'm waiting to borrow a friends to test it out.

[The Doc]

 

[Yohan]

 

[F17BAD]

I have AMK engine in mine

I have just Got a New N75 from audi dealership, the F is revised now to one that ends in E..

full part number is; 06A 906 283E

Old part number is: 058 906 283F

(Notice the number at the start is now 06 (old F valve is 05)

Cost me about £37 quid

The revision was done recently

[Wazzzer]

my brand new F and then the E the dealers replaced it with leaked

[Yohan]

Cheers guys.

Are these prone to leaking? Would it show up in a boost leak test?

My system can hold 25psi easy when I tested it.

Tonight I did a throttle body adaptation and then took it for a spin, not too much because it's icy but foot to the floor in 2nd and 3rd only saw a max of 17psi now.

I seem to be gradually loosing more and more boost

[Wazzzer]

do the suck test on it, I can't remember which pipes you need to try but you shouldn't be able to suck any air through two of the pipes

[Yohan]

Any more info on this suck test?

Do I just take the valve off to try this?

[jamie16v]

its the two shorter pipes i think.. the longer one goes into the tip if i remember correctly..

[Yohan]

Bottom one is boost from charge pipe
Shorter one goes to actuator
Longer one goes to tip

Do I block any when I do this test?

What should I be looking for?