You just can't turn up the turbo boost any more with the new engines. If the turbo start to boost more then the PCM is programed to, it will cut the fuel pressure down and you loose more HP. Here is a link for you if your looking to get good HP out of your 6.0 liter diesel. You can replace the wast gate for the turbo with a higher PSI rating but your going to have to by a electronic boost builder for the PCM so it will not kill the fuel pressure soon as you start making more boost. http://www.thoroughbreddiesel.com/bd-diesel/turbo-boost-builder.htm and http://innovativediesel.com/ Good luck and hope you get the HP your looking for to get out of your engine.
There is no waste gate on a 6.0 turbo. It is a variable vane turbo. The pressure is controlled by the vgt solinoid. The only way to gain psi from the turbo on this engine is to put in a programmer. I have used the Bully Dog with good results. Also recommend a Predator. Do your homework on a programmer that would give you what you are looking for. I also recommend changing the intercooler with an aftermarket one if you put in a programmer
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