I have a 04 5.3 with a 4l80 in an 86 C10. Sloppy 2 cam, single Gt45, DW 1000cc injectors, adjustable regulator, 2 bar map. Disconnect the turbo and throttle opens up to 100% at WOT, and I can hear the Turbo. Turbo hooked up and throttle won't open past 40% at WOT, I can barely hear the turbo spinning. I'm not looking for a hand out but just a point in the right direction. Is this in my tune or something mechanical? My vacuum gauge won't go to 0 so they match. have a BOV and wastegate. Double checked my wastegate and its not opening from exhaust back pressure. it runs good NA so I believe it would have enough exhaust pressure to spin the turbo. The turbo shaft does not have any play and spins easy. I can see it spinning in park. Pulled the compressor side off and everything looks good there too. All cylinders are firing and no abnormal codes that would put it in limp mode. On this data log it ran well but sputtered when on way to gas station, wanted to build boost but was that low on gas. Put 10 gallons of 93 in and right back to shit. Really hope this is something dumb I missed.
20240519 Strated good then got gas again.hpl
20240516 Increase timing_pulled fuel.hpt