Found the turbo waste gate port was 5mm undersize, which resulted in undetected boost creep. So this is what happens if you run 22psi on a tune for 18psi.
Despite this, it managed to finish 2nd in class at a two day national rally, and didn’t actually start running on 3cyl until we entered a hillclimb a couple of weeks later (and let go about 2km in to the first run)
Found the turbo waste gate port was 5mm undersize, which resulted in undetected boost creep. So this is what happens if you run 22psi on a tune for 18psi.
Despite this, it managed to finish 2nd in class at a two day national rally, and didn’t actually start running on 3cyl until we entered a hillclimb a couple of weeks later (and let go about 2km in to the first run)