I interested if any of you guys have a boost gauge fitted and have notice your cars overboosting when accelerating hard in 4th & 5th gear at low rpm. My A4 has a sustained boost of 1.32-1.43 (20-21 psi) during hard acceleration in 1st 2nd and 3rd (without fluctuating), yet when I put my foot down in 5th doing 50 mph @ just over 2000 rpm the car boosts to 1.7 bar. When the car reaches about 80 mph ish with the revs @ about 3500 the boost then drops down to 1.32-1.43 bar and sustains that without fluctuation.
When the car in running in the 1.7 bar zone it is like a complete limp snail and I guess the engine auto protection system kicks in. However i still dont know why the car is able to generate that much boost during those conditions when it controls the boost at all other gears/revs/speed. Any information or thoughts would be appreciated.