Last Saturday I installed my newly returned to me PCM from ZZP with their tune on it zzp-1-0-lsj-pcm along with a 3" cold air intake 3" Cold Air Intake. I have 42# injectors and a 77.9mm pulley.
I'm not sure what is going on but I'm a little disappointed with the tune. Granted, I was on the surface roads in my neighborhood and couldn't really let 'er rip. By the time I hit 3rd gear I was doing
almost 70! Anyway, you can see at the end of the short video during the test drive at about 4500 RPM I was only making not even 5lbs of boost. I don't know if with all that new air coming in it just
didn't call for more boost? I do have another set of 42# injectors, I was wondering if fuel delivery wasn't keeping up so it just didn't call for more boost? I reached out to ZZP we'l see what they say.

I do like the supercharger whine though!

Here's the video, it's only about a minute long the test drive is at the end.

 

Were you making the stock 12ish psi before the new tune?

 

You should definitely be at/around 15 psi.

 

@Tylink720 Yes, I was making about 12 -12.5

 

Possibly your boost solenoid or the ECU itself. My friends 2006 had this same issue. He found out that his bypass solenoid had fried itself, and in doing so, had messed up his ECU. He could still drive normally just made barely any boost.

 

LSJ's are fun about that... something stops working properly when you do some other modification, or when you have some other unrelated problem, etc... and you start wondering what you did wrong.

I've had it happen a handful of times. The first one that I remember was when I had a dead intercooler pump, took a while to diagnose, almost as long to convince the dealership that I was 100% sure that was the problem ("TechII doesn't show anything wrong"), they finally replaced it under warranty... first time that I hit boost after that, the car goes into limp mode. The SCIP sensor had died.

On Friday, the coupler connecting my charge piping to the turbo slipped off under boost. Car drove fine the rest of the way to work and then all the way home. I crawl under the car and fix it... and now the car breaks up when I get above 2500 RPM and I have a code for the MAF. Sigh, so I need to try running VE only to see if the problem goes away... then I'll know for sure that it is the MAF. Turbo shaft feels fine - that was my first thought, that the turbo had ate itself while the compressor had no coupling/resistance.

 

100% this lol I have been lucky with my LNF but I know a lot of others that are not.

 

lol, yeah. I've seen LNF guys put on an intake pipe or something... only to suddenly not have boost because a MAP sensor died or something.