ISTFA... Who knows about running boost off of the waste gate spring only instead of using a boost
01-23-2009, 11:59 AM
#3
WG spring = 6 psi max boost (stock); 14 psi max boost (1.9 bar spring).
The stock ECU controls the Waste Gate Frequency valve which in turn controls and overrides/adds to the mechanical boost limits provided by the spring.
<img src="http://pictureposter.audiworld.com/15624/boostpressurecontrolsystemvag111-33.jpg"><ul><li><a href="https://forums.audiworld.com/s4s6/msgs/150222.phtml">More N75 info</a></li></ul>
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01-23-2009, 12:05 PM
#5
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When the hose to the wastegate was off on my car, the boost gauge was reporting >20PSI.
I promptly put it back on, but is that what is expected with no control from the N75? I assume that is how the boost machine works but with more control?
Is this different than what audidrvr is asking?
Is this different than what audidrvr is asking?
01-23-2009, 12:17 PM
#7
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Disconnect the hose AND the N75 connector...or just the N75 connector?
In my situation it was just the hose that was disconnected.
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01-23-2009, 12:35 PM
#10
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I replaced my bad n75 with a MBC @18 psi 3k-4.5k then tapers to 15 till redline .But if i turn it
up ,the boost goes to 20 psi and bounces a little , wont go higher .
i have removed the hose to the waste gate and it does the same , so i would asume that it was openeing the wastgate.
car is stock .
When it gets cold i do get fuel cut some times so i just turn down the boost .
And i know that this isnt the proper way but this is my DD , all extra money goes to my B5 s4 Mods ...
i have removed the hose to the waste gate and it does the same , so i would asume that it was openeing the wastgate.
car is stock .
When it gets cold i do get fuel cut some times so i just turn down the boost .
And i know that this isnt the proper way but this is my DD , all extra money goes to my B5 s4 Mods ...