I bought my 06 ss this time last year, the car seemed to have something modded although the dude told me it was bone stock from what he knew of. I was building 16psi @wot an it was to quick for stock in my opinion. Besides that, I had it sit over the winter (outside) for 3 months. Battery died an wasn’t charged till spring, fired right up but threw a code for tps correlation. Put the new tb in (off a v8 vortec) 76mm I believe, with new plugs cai an a morgan catless exhaust. Bpv is a little stiff but still functional. No belt slip. Inter cooler pump functions properly Pressure tested an no leaks. No cel. The car will not build my original 16psi on stock tb an intake let alone my oversized tb an cai? Now 3500rpm is about 6-7 an wot is 10-11? I feel like It didn’t hit as hard before the mods, now it pulls about the same as before, just wanna know where my 5lbs of boost went lol clutch has a little give could that effect boost pressure? I’ve been stumped for damn near a year! My last thought is the first owner had a program on the ecu an it flashed all memory off the computer when the battery died. (Battery was dead for about a month) I’ve spent so much time on forums an nothing quite related to this matter. What do you guys think?

Tunes don’t disappear when the battery dies

Check and see what pulley is on it.

Stock pulley

Would a relearn clear a set up, I relearned the new tb an reset my ecu

I was at a meet last night an a guy with a laptop an a hptuner, we linked it an found a lot of cool **** out along with my low boost issue. Turns out I lost my pressure from the original stage 2 set up it had an went to stock after I relearned the tb. But we ended up putting a stage 4 Hahn 18psi file from off his lsj an holy **** the balts alive again

What the hell is a Hahn stage 4 18psi file??? A stock pulley puts out 12-12.5. You do not have a stock pulley if you’re seeing 18psi. You can’t just turn boost up on a supercharged car.

his tune of his stage 4 lsj was on a flash drive. plugged it into his laptop I did rolls from various speeds an cruised around out of boost Idk how or what he did to it but my car is seeing 16-18psi at wot, 15psi as low as 2500rpm. But 3.0 pulley an some dude that has built LSJs for quite a few people said my boost actuator solenoid is aftermarket an that I’m running Lucas 42# injectors which I didn’t even know about haha Idk everything about these engines but I use what I’m told by these guys

This my build that’s getting the last of the bolt ones this winter, until I go rouge an upgrade the internals

Pretty sure that’s a stock pulley. But either way something isn’t right. A tune doesn’t just increase boost

And that boost actuator is stock...

Boost depends on air flow