4.8s have smaller pistons and can handle more boost. You must get a boost gauge and fuel pressure gauge and wideband. You regualtor in the tank has nothing to do with not being able to have these items. Your engine is most likely only blowing oil out the dipstick and into the throttle body via the valve cover to throttle body vacuum hose. My 6.0 did the same thing till I changed the pvc set up. Actually i got rid of it. I put a breather in the valve cover. and bought a 2nd passenger valve cover and put 2 breather cap filters in. bingo no more blow by no more smoking engine. All was good after that. One member here has run 18lbs of boost on a stock 4.8. The same engine has seen 25lb spikes that would have blown a stock 6.0 to bits.
Last edited by zeake; 01-28-2009 at 06:58 PM. Reason: hit enter to fast
99RCSB Broke because I wasted thousands and thousands of dollars on my truck.
wow!!! awesome help thanks... i do have a boost gauge, but on my year they dont have and vaccum lines without check valves... and yes i do have oil in my intake aswell... my pvc system is still on... can you kind of step-by-step me in a pm or something on ho to make this thing work???
05 Silverado RCSB...
LQ9, TVS 1900, 4L80e, & EFI live.
07 Silverado VortecMAX CCSB LTZ Z-71...
Stock... so far
08 Cadillac Escalade 6.2 / 6.0... Wife wagon
I bought a cheap plastic oil filler cap from autozone and drilled it out and glued the filter into the hole on the filler cap. I then removed the drivers valve cover and put another passenger valve cover on the drivers side. then repeated the filler cap and breather mod. I capped the vacuum line on the throttle body that went to the valve cover with the smaller hole in it. It has been a while since i did this someone else may chime in and add details or easier fixes.
Also see this thread.
http://www.ls1truck.com/forums/power...tem-turbo.html
99RCSB Broke because I wasted thousands and thousands of dollars on my truck.
is there anyway of getting by with not putting apasseger side valve cover duplicate setup in the drtivers side until i can get my hands on all this stuff??? and in my body style i dont think that i have a vac on my TB... i have the radiator lnes on the bottom of the
TB... but thats aboiut it. where did you get you boost gauge to work at???
05 Silverado RCSB...
LQ9, TVS 1900, 4L80e, & EFI live.
07 Silverado VortecMAX CCSB LTZ Z-71...
Stock... so far
08 Cadillac Escalade 6.2 / 6.0... Wife wagon
I think i t d mine into the brake booster line. I am certain it can be done with out the other valve cover. Search on Silveradoss.com or performancetrucks.net. I know someone has done the same thing on an 05. My intake is a 99 so I really cant help much. I am not sure how different they are.
99RCSB Broke because I wasted thousands and thousands of dollars on my truck.
youve been a great hep i may just keep it for sure now... lol
05 Silverado RCSB...
LQ9, TVS 1900, 4L80e, & EFI live.
07 Silverado VortecMAX CCSB LTZ Z-71...
Stock... so far
08 Cadillac Escalade 6.2 / 6.0... Wife wagon
No problem. You should look into an intercooler really soon too. That charger will be night and day differance. Don't be afraid to post questions in the forum there are tons and tons of people here that really know whats going on.
99RCSB Broke because I wasted thousands and thousands of dollars on my truck.
I would seriously consider letting Nelson Performance do some work on it for you. If i lived as close as you do theyd do all my work for me.
99RCSB Broke because I wasted thousands and thousands of dollars on my truck.