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View Full Version : Can the N75 Valve be bypassed?



BIGBUDDHA
11-09-2004, 03:15 PM
Well to make a long story short . My car has gone into limp mode twice due to my N75 valve and this is the second one that I have changed out within a year. So I was wondering if I can replace the N75 Valve with a T Fitting. I have heard that some people have bypassed the N75 Valve completly so I was wondering if I can just do this with my stock K03.

skene
11-09-2004, 03:20 PM
what type of N75 are you using? Give details... its hard to diagnose unless you give necessary info.

BIGBUDDHA
11-09-2004, 03:39 PM
I'm Sorry. Its the stock one I believe its the F version The stock one's that they give you from Audi. I've also tried the J version but once I do one run in it, it'll put me back into limp mode and back to 4Psi of max boost. But what is happening is I can only get 4 Psi and I have a '01 1.8T with a APR chip. I just want to know if the N75 Valve is bypassable with a T Fittin.

skene
11-09-2004, 04:13 PM
only way you can bypass it is if you install a boost controller to take over the wastegate functions.
You may have installed the hoses incorrectly. I would start with checking that before anything else.
There is always a small room for failure that way.

sumpsfast
11-09-2004, 04:28 PM
Ah man, you gotta put the J valve in 180 degrees from its normal position. The plug has to point towards the bottom of the car. You will get sick boost for a bit....then LIMP!

Rieger_RS4
11-09-2004, 05:09 PM
Originally posted by sumpsfast
Ah man, you gotta put the J valve in 180 degrees from its normal position. The plug has to point towards the bottom of the car. You will get sick boost for a bit....then LIMP!

I haven't installed my N75 K yet, but you are saying it's installed different from the factory one?

4ingDrive
11-09-2004, 06:32 PM
Not installed different but oriented differently. The electrical connection end will be on the opposite side.

BIGBUDDHA
11-09-2004, 06:34 PM
Ok, So does anybody have a picture of how its installed. So far mines is installed to where the plug is facing towards the front of the car.

AsianA408
11-09-2004, 06:42 PM
will a TT one work for u?

Burntaudi
11-09-2004, 07:46 PM
Originally posted by Rieger_RS4
I haven't installed my N75 K yet, but you are saying it's installed different from the factory one?
I would ask Dahlbach about that one. I use the H valve in my car and goes in the same way as stock...but from what I understand the J goes in differently than stock.

sumpsfast
11-09-2004, 10:03 PM
Just make sure that the long and short ends of the "T" match up with the N75 and the N75J. This should be with the sensor plug pointing down.

nick91
07-26-2013, 05:52 PM
I know this thread is old but if anyone would like chime in that would be awesome. I was talking to my buddy who does dub builds all the time and mentioned about multiplying boost on my ko3 just by leaving the n75 plugged in electrically but putting a t firing in place for the hoses so I can run 10 psi to redline. Anyone know if this is possible without hitting limp mode?

Seerlah
07-26-2013, 05:54 PM
2004?

Search diode mod. Safe? No. Can you dial up the boost doing so? Yes. Mind you that you have no fail safe if you run lean. The n75 was it.

nick91
07-26-2013, 05:54 PM
Open to all opinions but seems like sweet and easy mod. I am new to this forum but I am very familiar with my car mechanically

Seerlah
07-26-2013, 06:10 PM
Just get a tune and run 18-21psi safely. Used ECUs with tunes can be had for cheap.

nick91
07-26-2013, 06:15 PM
No 2000 I will try searching diode not sure about the whole thing but figured I would get some opinions from people on this forum.

nick91
07-26-2013, 06:17 PM
That what I had told him as I plan on running giac but he said its stupid to pay the 450 when you can something as simple as this

Seerlah
07-26-2013, 06:37 PM
Don't listen to that guy. 10psi is nothing. My car came with more than that stock (AWM at 11psi).

$200 tune. GIAC, APR, Eurodyne, etc does not really make any significant difference on the stock turbo.

http://www.speedtuningusa.com/products/spt_prd_chip00.html#PowerChip