Compression Ignition Addict
Join Date: Oct 2008
Location: DFW Airport
Thanked 15 Times in 15 Posts
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I just went thru this issue with my "Perfectly Running Truck" hitting low 20's on Boost.
When replacing the Turbo with Mad's Stage 1 again i could hit 22 - 23 occasionally 25 PSI he was adamant that the turbo should easily hit 30 PSI, something i had never seen before -owned the truck for 5 years.
So i began the search for an air leak per Adrian's direction.
Started at the "Y" Pipes and clamps up and down behind the Turbo, cinched them up tite good news is if there is any leak here the SOOT will show the path.
Next step CAC Boots, took them off, cleaned thoroughly and remounted with hair spray -AquaNet.
Removed Cold CAC Tube and cleaned it really good looking for cracks ended up replacing it for peace of mind, Thanks Tousely
Removed the Tube attached to the Turbo and FICM via (2) 8mm bolts and CCV Tube. Turns out this was the source of my leak for 4+ years. Replaced with Tube from Tousley.
The tube is hard plastic with a beveled inside and beveled flange on the turbo just enough to where the tighter i would turn the hose clamp a little more of the flange would be visible it would never get really tight. You could see just a bt of the turbo flange in the "8-O-Clock" area. No SOOT of course and NO visual of a leak.
I've completed the CCV mod and removed that hose so no more oil in the CAC Tubes and i can hit 30 PSI with literally NO effort.
If you have a tune, 30 PSI should be easy to hit, you have an air leak.