i lost 10lbs of boost when i swiched from my stock vp to the hotrod vp im clue less as to y this is. i was gettin 38 psi with the old pump and after the instal i could only hit 27 with my quadzilla all the way up i can hit 31lbs but very rarely its the stock turbo and it dose have some shaft play also i noticed my quadzilla with the stock tunes isnt as intense as it use to be like on my old pump any tips would help i couldnt find any holes or cracks any where also i have played with the timing on the quadzilla and it works best set at zero timing. my old stock vp blew more smoke than my new one with the quad have had a map sensor code a while after the new pump but it hasnt come back yet since then. i have a new sensor on the way


my truck: 2000 dodge cummins 5'' mbrp, raptor 150 running 30 psi, quadzilla adrenaline stock tunes, hot rod vp44, afe stage 2 intake, 1/2 inch fule lines, 35's

 

Im not sure what is causing your boost loss but I do know that your fuel pressure if it is 30 psi, is too high. I believe you should not go above 20 at idle and below 10 and wot

 

So im gonna say u have a stock hx35? You are most likely over fueling that turbo which can cause boost loss. Your fuel psi is WAY to high... your decreasing your GPH from the raptor by kicking it up to 30 psi which can be starving your pump. Turn the regulator down to the 20 range and start looking into getting a bigger spinner

 

i know for sure my fule pressure is to high lowering didnt help at all and my stock turbo is the hx 35y so could the turbo be getting a little to week the truck has about 147000 miles