How far can I raise the boost pressure with out doing damage to the engine?? This is a stock 83 zxt without any mods , yet.

 

The majority of the community will tell you that 10psi is the most you can run without an IC. I for one have run up to 12psi with no problems. I used high octane gas + additives and learned to listen to the engine at WOT. It isn't very safe though but you know your car better than anyone does so you have to pay attention at these boost levels. If I where you, I would hook up an aftermarket boost gauge + a boost controller....then raise your boost 1psi at a time...once you hear a little pinging, bump it down and your done. Where you live (elevation) also plays a major role in how your car takes the boost. I live in Vegas and 12psi here was a-ok. But when I was in San Diego, I couldn't boost passed 10psi without pinging. You'll have fun with 10psi but I would highly recommend an intercooler as your next big mod. Believe me it's worth it and there's a big difference between 12psi intercooled and non-intercooled. The turbo just runs more efficient. Good luck and be safe...don't blow your motor!

 

I live in LA am boosting 10-12 psi without intercooler no pinging
but i put octane booster and 91 oct so far its good I got a turbonetics manual boost controller, cold air intake removed the pop-off valve a acurate autometer boost and air/fuel guage to see my air fuel ratio so far so good 150 thousand miles on my engine

 

Thanks for the info, I just got my injectors back from the cleaners , have not installed them yet , waiting on seals. Im wondering about the fuel pressure, 60 psi sounds heafty, what is the stock fuel pressure set at?? I will need to pick up a air & fuel ratio gauge . I have a after market boost gauge , also not installed yet. 10 pounds of boost should be quite a improvement, Im only running about 5 Lbs currently, The guy at the injector shop says the spring in the wastegate could be weak, who knows , thats another project for my list. Later, Bonz