boost guage question
12-30-2004, 06:23 AM
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boost guage question
this is probably stupid question, but what line should i tap into to read actual boost combined between both turbos, or does it not matter?
btw its 2001 b5 s4
btw its 2001 b5 s4
12-30-2004, 06:28 AM
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The FPR line that most people use is measuring manifold pressure...
which is after the airflow from the two turbos has combined at the throttle body boot.
You could also tap the N75 supply line which would measure combined pressure at the turbocharger outlets.
-Dave Pramanik
You could also tap the N75 supply line which would measure combined pressure at the turbocharger outlets.
-Dave Pramanik
12-30-2004, 10:02 AM
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Yes, FPR = Fuel Pressure Regulator. No, gas will not be in the gauge...
<center><img src="http://ctny.audiworld.com/mark/s4/other/dapboost/dsc02203.jpg"></center><p>The FPR has a pressure/vacuum line running to it so that it adjust fuel pressure based on your present boost (or vacuum). There is only air in that line, no fuel.
-Dave Pramanik
-Dave Pramanik
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