ok, so I just picked up a used 5.9 to put in my ram. plan on rebuilding it and thought it would be cool to but a turbo or turbos on it. I was told I could use the turbo from the 5.9 cummins, but as I just put long tubes,x pipes and some spintechs on my truck I was thinking about doing a twin setup. my question is what would be the best turbo? I know its hard to get little lag and top end, but what is a good set up for upto 6k rpm without having too much lag down low?

 

There was a member here who put a turbo on his 5.2l, I think his name was Hans. Maybe do a search and take a look there. IIRC he wasn't able to run much the 6-8 ibs of boost because otherwise it would blow the head gasket.

 

I plan on building this motor. new internals, ported heads, intake, rockers, pushrods if needed. going to go with an electric fan(s) and anything else I can do to limit rotational mass while still keeping it a nice DD (SO keeping the a/c and what not) but I will search for hans.

 

I've been around long enough to tell by your questions that you need to do a lot more reading. A CTD turbo is too small for a 5.9, especially if you plan on doing all this other work to the motor.

You're confusing lag with boost threshold. Lag is how long it takes to spool when you nail the throttle when already above the boost threshold. Boost threshold is the RPM at which it begins to make boost, which is also dependent on load, which varies with tire size, gears, what gear you're in, ect. Nice thing with an auto is that with a proper stall, you have the threshold RPM instantly when you punch it, so "lag" is never really a factor.

Before anyone can recommend anything we need to know your power goals.

 

The CTD turbo was just a suggestion from a guy at a shop I worked at since its a 5.9l as well. I figured the turbine wheel might be too small since its for a motor that redlines at 3500. maybe he was suggesting running 2 of them im not sure. As for the things im doing to the motor its more so it can handle whatever hp it does make. Ive read the stock internals can go to 450-500 at the flywheel, but since it needs rebuilt I figured I would do it right. I am also converting to a 5 speed since I believe the auto I have now is starting to go. As for tires I have 35in general grabbers. gearing is the stock gearing my ram cam with. As for the hp im looking for I would be happy with 400-450. I called performance shop yesterday and was told this: that I basically have a 6.0l engine, so if I could find two turbos that are designed for upto 3.0l each I could use those since each turbo would only be handling half of the 6.0l engine. then again another thread on a diff forum said just to get 2 turbos from something like a wrx, or even 2 t3t4 turbos and adjust the boost as needed. As I have only had one car with a turbo, im not sure how to go about finding a turbo for a car that didn't come with one.

 

Two CTD turbos would work well, but overkill for the power you want. I wouldn't use those tiny car turbos. A good single 67-70mm will do everything you need and keep complexity down. Wheel HP or crank HP? 400-450 crank isn't that hard with a mostly stock motor.

 

I was hoping for whp. And was going to run twins since i just paid fir a x pipe and new mufflers