It would go into half power mode and put up CEL right quick. Your car would freak out if you had a legit boost leak. anything more than 11psi of holding boost will cause hard limp mode because the ecu will. Put a JB4 in there you will def hit some higher boost. Standard 2k rpm max acceleration 35ish on a mapped car more like 65 ish. Stock map injects around 64mg/str fuel between 3-4K a remapped car more like 75-80mg/str and there will be a lot more fuel injected at lower RPM. Would that be the correct way to reason it, or should I be checking for a boost leak somewhere The actual amount of boost may not be much more than stock as there is plenty of spare air as standard. I am wondering with the electronic wastegate and with BMW stock tune that they tuned it for consistent output of power so in winter to hit "300lbs of torque" it only takes 7psi, and in the summer with less dense air and higher IATs that it will take 10psi to reach that output. Just wondering how are people getting 10psi?
#B8 HOLDING BOOST AT PSI STOCK MANUAL#
I logged my 435ix via OBD today and did I bunch of WOT runs. Ok I know so many if not every on here on the bord is not going to aprove of this, firts of all I am holding 20.5 PSI on the stock AWP turbo it drops to 16-17 at red, but I am not keeping it this high, What I did was remove the N75 valve and built a manual boost controler at Home depot I had really bad surging problems with my GIAC V10 and this. Anyone know the B8 3.0TDi stock boost psi Jump to Latest Follow 1 - 1 of 1 Posts. Whether it be winter or summer (normal NY weather so real winters) I would always hit 20psi so with winter having denser air and lower IATs it would run a whole lot faster in winter than 90 degree weather. The fact that less boost gets bleed is why you can get so much more power from just a tune. The biggest thing Stage 1 does is it regulates how much boost goes in the TB and when the boost is bleed off, along with other stuff, But it does not and cannot add more boost PSI.
On my previous car I was running a td05-16g turbo at 20psi. Thats exactly what the stage 1 ecu tune does. Same issue after.I read that stock boost pressure for the n55 is anywhere from 7-10psi 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.
#B8 HOLDING BOOST AT PSI STOCK INSTALL#
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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