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B8 holding boost at psi stock9/1/2023 Maximum possible boost: The easiest way to achieve maximum boost is to, just pinch the boost sensor pipe (the black pipe). Increase the maximum boost: By reducing the length of the rod, you increase the preload, which means, more boost is required to open the wastegate valve and hence more maximum boost.īypass the turbo: For bypassing the turbo (no-turbo effect), just remove the pin, and uncouple the valve and spring mechanism. Now, y ou can turn the rod to increase and decrease its length.ĭecrease the maximum boost: By increasing the length of the rod, you can reduce the preload which means, lesser boost is required to open the wastegate valve. Loosen the nut shown in the figure below. Remove the pin or circlip which holds the rod to the valve. Hence, by this wastegate mechanism one can decide on what max boost one can run. When boost drops, the rod is pushed up by the spring which again closes the wastegate valve, and hence now, exhaust gases have to escape by doing work on the turbine wheel, which inturn builds up the boost. Hence, the compressor fins doesnt turn, and boost drops. Opening the waste gate valve creates a bypass way for the exhaust gases to escape, without doing work on the turbine wheel. Pushing down the rod means opening the wastegate valve. The boost is built up in the compressor, and the black pipe, which can be called the boost sensor(?) conveys the boost pressures to the actuator, where there is a spring mechanism, which pushes down the rod. Usually what happens in a turbocharger is: Given below is an illustration of how you can adjust the preload setting of your turbocharger. Increase the max boost (at higher rpms).The best part is that, you can increase or decrease the boost, and hence increase or decrease the power of your turbocharged vehicle at home, with just a spanner and a plier. Same issue after.Most turbos in India (I guess.) come with an Internal wastegate which can be tweaked for different purposes. I wonder if I'd expect a CEL if the car was producing way low boost? There seems to be a lot of voodoo around an ecu reset, but for what its worth, I did disconnect the battery for 10 min, and then rehooked it up, then let it sit, then started the car, and let it sit for a while idling. I don't think this has anything to do with the issue but maybe it does. If that reads low, then I guess I can take it to the dealer and tell them "the car is not developing the correct amount of boost, please check it out".Ī little background, the car was stasis tuned before I bought it in may of 2011, and the stasis work was done by the audi dealer I get maintenance/service from. Although I don't suspect a leak around this boost tap, it will return the car to "stock" config without the boost tap between the supercharger and throttle body intake. Was thinking that I could take out the boost tap and return to stock, and re-measure block 436 for the manifold pressure. I did have to install a boost tap between the throttle body and the supercharger output when I put in the gauge, but that was about a year ago, and things have been solid since then, up until a few days ago when I noticed the issue. I also noticed I am not hearing the same sort of supercharger whine I was used to.Īssuming I read low boost/pressure in the manifold what steps would you all take next? I am not too familiar with how the bypass/diverter or etc work on the supercharged engine in the B8 S4. I am going to have access to a VAGCOM/VCDS tonight to read block 436 to read the absolute manifold pressure, to make sure there is really a problem. I thought maybe the gauge is off, but my one grease monkey friend says its not pulling as hard as it used to. Just noticed the other day that my Boost gauge (AWE tuning vent mount gauge) was only peaking around 5-6 PSI when I have the throttle down to the floor (usually peaks around 12, 13 or so).
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