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I do not think that the return pipe could be the cause of your particular troubles, unless perchance it is leaking in a lot of unfiltered and unmetered air (assuming your ECU is still using AFMs). And then it could be very bad, but it shouldn't prevent you making boost. Blow then engine up from running lean? Sure. But it would make boost. You really needed to disconnect this thing from the turbo inlets and close those inlet ports off a year ago, and you should do it now. -
Pressure Ratio = 2. ie, 1 bar of boost (assuming 1 bat absolute pressure at the compressor inlet). This is relevant because compressor maps do not have "boost" up the y-axis. They have pressure ratio.
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Revisiting this thread again x2... 1 year later. This car has been an ongoing project between life. But, I never removed the re-circ pipe. I know, shame on me. But since then, i took it to get tuned and only making about 280hp (lame) and i'm chasing a boost issue where the car wont boost past 7-8psi. Mac valve installed. Haltech Platinum pro with the map sensor. This is the first time i've tackled the turbo side of things, but i have that side somewhat taken apart to chase the waste gate vacuum lines. And noticed this stupid pipe again. I'm peicing together the puzzle and @GTSBoy mentioned that it was a big vaccuum chamber and said a bunch of car math stuff that I couldn't quite follow the car math (im trying). You guys think this would be the culprit? between rotting vacuum hoses? i'm making a DIY boost leak tester this weekend. -
What is PR2?
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I just spent a silly amount of time reading other forums' posts and watching "whats this noise" videos on Youtube. It *appears* to be the front diff having killed a pinion bearing or similar. Its almost definitely driveline, I haven't tested to see if the car makes the noise in N though but either way I think it's gonna be pricey. This is outside my area of comfort and expertise so I'll get my BMW guys on it. The bearings are attached to the hubs so are super easy to replace (at least in comparison to press in bearings) so I'll do them also.
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