ok i have the 2.8 pulley on and i have a full exhaust just wondering if the exhaust lowers the amout of boost you see or i have a problem

when in second gear the car boost really fast till about the 15 and then it kinda feels like it isnt pulling anymore at all.. can there be something causing this like something interal or something else

 

i saw less boost after i did my header and downpipe. but hot weather can affect it as well.

 

im hitting 17.5 with mine. full header, exhaust, blah blah blah.

how hot is it there?

 

im seein 17.5 with my 2.9" and stock exhaust...i was seein 10psi at one time,but the gauge was fucked up...how does ur boost climb?does it go up fast or does it skip numbers

 

it goes up fast then kinda stops at 13 then goes on up to 15 during that time if feels like it isnt pulling very hard at all 68 degrees today

 

hmmm..u MIGHT have a broken spring inside the boost gauge....thats wat mine did when it had s2...and all of a sudden it would boost past 10psi...and 2 days later i turn the car off and boost guage is still reading 10psi...had to warrantyed and now it hit 15psi by 4000-5000k and 17.5 by redline

 

yeah you think that could be the problem

 

15psi here on a 3.06 pulley... 15 psi on a 2.90 pulley... and 15 psi on a 2.80 pulley..

same problem

 

go change ur boost gauge...the spring inside the guage gets weak after time and the needle starts to slow down...go to lattof chevy and ask for brian poderaki..tell him Joe sent ya..he will warranty the gauge

 

wtf.. its an autometer gauge.. i never had problems with autometer b4, what gives?

 

All i see with my 2.8 is about 16.

 

autometer is one of the cheaper,but good gauges...if u want some accurate gauge go buy a defi..300+ for the gauge and another 200 for the controller...

i remember on my srt when i had the stock gauge,after i installed the big turbo the gauge was acting all weird and **** since the spring inside the gauge went crazy cuz boost was goin faster than the spring can actually keep up,so after time i only saw 12psi on a big turbo..was kinda funny

 

w/ my 2.8 i get 15psi by 3700rpms, but i have stock exhaust manifold and dp

 

Shot at 2007-08-21

 

yeah taht should be about right but do you have a full exhaust like some of the rest of us

 

header, downpipe, and cat all provide better flow which will mean lower PSI

PSI is just a measure of the compressed air at your manifold, if you have exhaust mods you will have less back pressure there for less psi but more HP

 

^^^^thankyou that is the anser i have been waiting for all day... unless my guage is bad

 

^ your welcome

you actually want to limit your PSI by way of exhausting mods.... more air in = good

more air in and even more air out = excellent

 

i have full exhaust and seeing 17.5 on a 2.8

hell, i got the stg2 to pull 18 psi. there are many variables. hell i can post a log file if needed, you just have to convert it

 

well last nite i took the car out and maxed out 2 gear and same thing it only went to 15 then i maxed out 3rd gear and it went to 17.5lbs of boost ... wtf i dont know what is going on

 

are u running 42 lb injectors?

Also I never see FULL boost in 2nd or 3rd close but not FULL.

 

yeah i am Y?

 

because I never had the boost problem but I did experience that the car kinda gave up problem, it was knock sue to lack of fuel. Im sure your tune is cool but check for knock retard.