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03-14-2026LAST POST
Tejas1836 wrote820-850ft above sea level, cars also on 91 octWhat is your altitude ASL?
Tejas1836 wroteyea, after a bunch of digging i found out regular boost levels are 10-13 psi stock i was confused because b58 engine specs for the tu say 15-18 psi but i guess the x5 is detunedI think your 11 psi gauge pressure is normal for a stock ECU tune
Michael Melo wroteYou can try running it with shell 93 or Petrocan 94 and see if the boost changes with the higher octane. (I prefer Shell 93).yea, after a bunch of digging i found out regular boost levels are 10-13 psi stock i was confused because b58 engine specs for the tu say 15-18 psi but i guess the x5 is detuned
6SPDG82 wroteWe don't even have 94 around here, 93 is extremely hard to find unless you go to Toronto, will give it a shot tho thanks!You can try running it with shell 93 or Petrocan 94 and see if the boost changes with the higher octane. (I prefer Shell 93).
Michael Melo wroteYou are getting this number in sport display but launching the car or full accelerating past the kick down?I have a 2019 g05 x5 40i with the b58tu the car won't make more then 11psi of boost, everything i've read and seen online says the b58 stock boost levels are 15-18psi. The cars stock mapping indicates 11psi of boost at 5800rpm while making around 350hp~350 tq.
