when i got the car it would mostly go over 15 pounds, now it stays at 14 barley getting to 15 whats the deal with that? is it because i put cheap gas in it ?

 

also thats even on nice cool nights where you would think it would make alittle more but it doesent..

 

I'm getting the same in Houston. 14, up to 15 at times.

 

Usually 15, sometimes 16 maybe 17.

 

ok thanks hoping it was not another problem..

 

Mine was 16 at first then dropped to 15. Today though it is only at 14. If it drops to 13 im taking it in...

 

i have been pushing it as hard as i can the other night and 14 max im with you lower than that somethings up...

 

Maximum boost level is an altitude based parameter. I hope HP Tuners fully supports this PCM shortly so I can dig into the parameters and see what GM is doing. Here's a quote concerning boost level from one of the engineer's:

Source: http://www.theautochannel.com/news/2...26/074040.html

I'd bet the boost level is set via a table in the PCM referenced off of BARO. BARO is read once per drive cycle during the initial key on event.

 

yeah i remember reading that...i got to get up some money for that tuner 14 pounds dont do it for me at all!

 

I went through the same thing with mine (5 speed) after 500 miles, I started driving it hard and was getting up to 17 lbs in 2nd and higher. It gradually reduced to 15 max after that (regardless of temperature and altitude to 5000 ft). First gear was even worse with very unpredictable variation. Hahn/PPC tune took care of all that, now 20-23 psi in all gears (perfect range and very respectable power).