Turbo 300 questions.

[Nitesaber]

Sorry turbo_b for the larger post, didnt mean to jack thread. But here is my post again for anyone else who can help me out.

Ok, well i am going to get started soon on fabrication for my turbo system. I will start looking around for a diesel turbo in the local yards and ill look out on ebay. Any suggestions on a turbo, i would like a bearing turbo seeing as they spool up at lower rpm ranges and still keep spooling at higher ranges. Looking to start the spool at about 1200 to 1500 rpm and to cap it at 10- 14psi when i am all done with the total build. When i do it at first i want to cap it at 8 to 9psi but every 500 or so rpm i want to up the boost 1 psi to 2psi from the initial start at 1200-1500 rpm. I would prefer to use a cummins turbo or ford turbo from a 6.0L and maybe a 7.5L but i heard the 6.0L came standard with the bearing turbo.

 

[Emerald 74 4X4]

I don't think the 6.0L is a ball bearing turbo, but i could be wrong. I do know that you need a way to control the variable vanes that make this turbo work. It is seriously useless if you cannot control the vanes because of the large sizes of the compressor and turbine housings. If you couls stick it in the open position (i believe), then you could get a good turbo without lag and just not use the rest of it's potential. But at that rate, you might as well pick one that suits the application for a cheaper price.

All the garrett GT turbos are ball bearing turbos.

Also, anything off of a newer CUmmins will have a Variable nozzle similar to the 6.0L Ford, which you will run into the same issue if you cannot controld the variable nozzle.

I am using a T04B Garrett with a .82 A/R turbine and .60 A/R compressor. It seems to work well for higher RPM boost, which is where I want it. It stays at vacuum in cruise and lower RPM's.

The best way to select a turbo is by application. What are you doing, racing, towing, somewhere in between, leaning towards one spectrum more than the other? This is wehre you will reap the benefits of turbo selection is in application. Just the same engine setup for Top fuel dragster does not lend to a 30,000 Lb dump truck hauling soil for yardwork, if you were to look at opposite ends of the spectrum.

 

[Nitesaber]

My purpose is for a daily driver that has a hell of alor of get up and go and at cruise of about 80 has some boost so it will take alot of strain and maybe even help lower the amount of fuel dump once i get a fuel injection system. I also haul 2-4k lbs every so often over a distance of 50 miles at 70-80mph as is due to time crunch of the work i do. I am getting about 9-11mpg with load doing 65-70 and about 7-10mpg doing 75-80. So i need something more for highway and cruising.. prob not looking to much into the 5k plus range. I tend to stay around 2.5k now but would love the extra get up and go in town with load or without.