I have a fully built integra gsr from the bottom up, and i just put a t3/t4 setup on there. I only have a 7pound spring in the wastegate but when im only halfway in the throttle and it boosts up the wastegate opens and starts popping and wont let the rpms rise anymore, they stop at like 4 to 5 grand. Plus im on my third set of spark plugs because the porcilean keep cracking on them and the last one i pulled out was completely broke in half!? please help me out?

 

Ummm tune?? If you got a reliable tune, then sounds electrical.

 

run colder plugs..sounds like u have an ignition problem or fuel supply...