ORIGINAL: level7

OK he says the ECU is GIAC "x chip" or something of that matter. Says its the best chip they make? Anyway the DV is fine, its been upgraded to the hyperboost one from what im told. I have had a similar problem with my RX7 in the past and it turned out to be a slit in a vacuum line. It would push boost out the slit upshifting but once the motor decelerates and creates vacuum, it would seal the slit thus giving back some boost in 3rd and 4th just like his car is doing now. The difference is boost is controlled via MAP sensor and TCS (turbo control solinoids) not ECU like the Audi. Hmmm...