1990 mspnp2 t3 turbo back fire at 5krpm
 

Having trouble with anything past 10psi suppose to have a 14psi wastegate with no controller. Im not to intelligent when it comes to tuning the mspnp2. I'm currently on my phone at work (night shift) I have a tune file.and data long read to send to whomever is willing to take a look at it first thing in the am. I have 800cc injectors and a 340lmp.fuel pump stock fuel rail and regulator.

Please post the MSQ and data log.

Post them. Probably overboost.

Twas overboost protection.. now my afr are wacky wide band harness been pliced in multiple spots! Was on car when bought. Should I just buy new harness or hole new wideband?? Aem ugeo is what I have..

you should switch overboost to fuel only or fuel&spark.