Detroit 12.7 turbo upgrade

I have heard that unless you're putting out some serious horse pressure, on a DDEC4, the waste gated K31 is the best replacement. If you're insistent on a non-waste gated turbo, the 1701 would be the better choice. This is a thread regarding which turbo 7 years ago. @allan5oh on the fourth page explains why the 1701 is the better choice.

Borg Warner turbo upgrade ??

 

I've tried multiple turbos on my 60. The K31 with wastegate plugged outperformed all others in every way.

Quicker throttle response, much more boost PSI, and decent fuel mileage.

 

I have two identical trucks, one with k31 and one with 702. 702 has more pulling power up top, but k31 has way less lag, spools much faster.
I personally prefer k31 and I think it would be better in your situation since you are local. 702 is for people who like to fly up the hill doing 70mph

 

I'm running a stock 500 with ceramic manifold and K31. I can pull about 35 psi.

With my tuned 11.1 and a K31, i was pulling near 50 psi.

I would think your engine would have came with a K31. Why do you think you need to change?

I buy all of mine from River City Turbo in Little Rock. Think they're 750-800$ now.

Where are you located?

 

I have around a 500 hp tune in a DDEC2. I have a 1701. I keep my foot in it for a long pull. On short pulls and I have it wound up, it's close to 35 psi.

 

That is "I keep my foot out of it"