2011 S4 stuck around 5-6 PSI boost
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Audiworld Junior Member
Joined: Apr 2011
Posts: 21
Likes: 0
2011 S4 stuck around 5-6 PSI boost
Hey all,
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). I thought maybe the gauge is off, but my one grease monkey friend says its not pulling as hard as it used to. 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 also noticed I am not hearing the same sort of supercharger whine I was used to.
Assuming 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 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.
What next steps would you all take if I read low manifold pressure. Was thinking that I could take out the boost tap and return to stock, and re-measure block 436 for the manifold pressure. 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. 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".
A 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. I don't think this has anything to do with the issue but maybe it does. 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. Same issue after.
Cheers
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). I thought maybe the gauge is off, but my one grease monkey friend says its not pulling as hard as it used to. 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 also noticed I am not hearing the same sort of supercharger whine I was used to.
Assuming 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 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.
What next steps would you all take if I read low manifold pressure. Was thinking that I could take out the boost tap and return to stock, and re-measure block 436 for the manifold pressure. 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. 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".
A 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. I don't think this has anything to do with the issue but maybe it does. 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. Same issue after.
Cheers
AudiWorld Newcomer
Joined: Mar 2011
Posts: 2
Likes: 0
Hey all,
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). I thought maybe the gauge is off, but my one grease monkey friend says its not pulling as hard as it used to. 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 also noticed I am not hearing the same sort of supercharger whine I was used to.
Assuming 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 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.
What next steps would you all take if I read low manifold pressure. Was thinking that I could take out the boost tap and return to stock, and re-measure block 436 for the manifold pressure. 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. 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".
A 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. I don't think this has anything to do with the issue but maybe it does. 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. Same issue after.
Cheers
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). I thought maybe the gauge is off, but my one grease monkey friend says its not pulling as hard as it used to. 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 also noticed I am not hearing the same sort of supercharger whine I was used to.
Assuming 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 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.
What next steps would you all take if I read low manifold pressure. Was thinking that I could take out the boost tap and return to stock, and re-measure block 436 for the manifold pressure. 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. 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".
A 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. I don't think this has anything to do with the issue but maybe it does. 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. Same issue after.
Cheers
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