V8srfun
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I am starting to research and plan the turbo upgrade for my truck. Because I am planning on using a aftermarket wastegated turbo there are a few more variables than just buying the military upgrade kit and calling it a day. Let’s hear your ideas and opinions on what will work, what precautions need to be taken, and what will not work. The plan is to fund a turbo that will overcome the shortfalls of the factory turbo that is miserably inefficient and can not control its own boost levels. We should not have to be limited to the fuel screw when we want to change how much boost the engine gets. I am trying to keep this as basic as possible and not dump a fortune in it so please keep this in mind.
Some of the obvious things
- Need a turbo only things I am settled on at the moment is it must be t4 flange and internal wastegated
- correcting the injection timing
- pyro and boost gauges
- exhaust size and placement
- boost levels and how it reacts with fueling and egt
I am liking the turbos being sold as Cummins hx35 replacements they seem to have most everything I want. Some of the problems is the compressor outlet is v band and I would rather just have a barb style end where I can directly attach my boost hose. And the wastegate spring pressure is not openly advertised on some of these but the ones that do usually are at 20 or 25 psi. I would rather it be set at 15 and I could adjust for more if desired.
boost pressure threshold of the engine is a factor but I don’t know what to believe on this subject as there are so many opinions and they are wildly different. For example as long as my egt’s are safe I think 25 psi would be safe but I don’t know. Remember I will be using a turbo that will be efficient enough to make boost regardless of where my fuel is set at. For example what will be the difference in how the engine responds to 20 psi at factory fueling compared to turning the fuel up some. For example if I am running 20 psi of boost and can’t get my egt over 975 degrees would you think that that is to much boost.
when adding the turbo in military spec there is a preset injection timing mark that needs to be adjusted. I have read threads where guys have tried to skip this step and the truck wouldn’t run well until the adjustment was made. I am not suggesting to avoid this step but would rather know more about what it actually does and how it effects the engine. For example I understand spark advance timing on a gasoline engine and how adjustment effects the engine but I know nothing about diesel injection timing and what advance or retard will actually do in the combustion cycle.
lets hear your ideas thoughts and concerns
Some of the obvious things
- Need a turbo only things I am settled on at the moment is it must be t4 flange and internal wastegated
- correcting the injection timing
- pyro and boost gauges
- exhaust size and placement
- boost levels and how it reacts with fueling and egt
I am liking the turbos being sold as Cummins hx35 replacements they seem to have most everything I want. Some of the problems is the compressor outlet is v band and I would rather just have a barb style end where I can directly attach my boost hose. And the wastegate spring pressure is not openly advertised on some of these but the ones that do usually are at 20 or 25 psi. I would rather it be set at 15 and I could adjust for more if desired.
boost pressure threshold of the engine is a factor but I don’t know what to believe on this subject as there are so many opinions and they are wildly different. For example as long as my egt’s are safe I think 25 psi would be safe but I don’t know. Remember I will be using a turbo that will be efficient enough to make boost regardless of where my fuel is set at. For example what will be the difference in how the engine responds to 20 psi at factory fueling compared to turning the fuel up some. For example if I am running 20 psi of boost and can’t get my egt over 975 degrees would you think that that is to much boost.
when adding the turbo in military spec there is a preset injection timing mark that needs to be adjusted. I have read threads where guys have tried to skip this step and the truck wouldn’t run well until the adjustment was made. I am not suggesting to avoid this step but would rather know more about what it actually does and how it effects the engine. For example I understand spark advance timing on a gasoline engine and how adjustment effects the engine but I know nothing about diesel injection timing and what advance or retard will actually do in the combustion cycle.
lets hear your ideas thoughts and concerns
