I am trying to program a AEM Tru-Boost controller/gauge. It requires the "Waste Gate Spring Pressure" to be input. Any clue what the magic number is on the APR 3+ (225 h.p) set-up???

Thanks in advance

 

Most come with a 5psi spring. As far as i know, APR just moves the location of the wastegate and doesnt change it. If you want to find out 100%, bypass the n75 and run it off the wastegate and you will have your answer. Just get a strait tee peice to do the job.