What i got; 2003 cummins 305/555 automatic, tst, boost elbow

Problem: truck will not boost over 30psi, no smoke whats so ever.

What i've tried.. turned the boost elbow all the way in and out, pulled the waste gate hose off, checked the waste gate itself to ensure free movement, and plug the boost elbow port with a solid plug. turbo spins freely, no movement in the shaft. I have turned the tst all the way to 4/4 and it does not smoke, and will not boost more than 30 psi. It makes boost to 30 very easy but just stops at 30. Talked to tst and they report that the truck should make boost over 40 and the guy i purchased the tst from reports he had boost up in the 40's. Also the exhaust gas temps never get that high less than 1200.

What do you guys think?[/align]

 

what is your intake & exhaust setup like? I know the open exhaust & free flowing intake will allow mine to peak in the mid 40's easily... put the stock airbox back on and that is no longer an option. mid to upper 30's max.

 

intake and exhaust are completely stock, one thing is that it doest even pull the filter minder?

 

your not flowing enough air to get more boost... IMO...my suggestion is to get an aero 4040 and replace the cat with it and thenadd a 24~30" magnaflow where the stock muffler is... then get a CAI or performance drop in filter. you should spool up much better with that setup. with my stock exhaust and AFE setup the best I was able to do was 35~36 psi. open up the exhaust & then I was up much higher...

 

the exhaust doesnt have a cat..

 

makes it even easier... do a 30" magnaflow in place of the stock muffler and try a drop in filter. You should be able to get 35psi out of it.