The right size turbo upgrade for your Caterpillar C15 & 3406E 

It depends on the situation, see below: For a relatively stock (maybe just a tune) 14.6L Cat - the 1.32 is ideal. It spools up fast but still is large enough to flow up top. The 1.32 is plenty on a 78MM for anything under 600HP (Again, only talking cats, not engines in general). For a truck with a real hot tune or some light upgrades, this is when I would recommend the 1.45. (anything under 650HP) The larger housing slows down the shaft speed and lowers drives pressure. Still providing plenty of boost pressure and additional flow up top over the 1.32. By going with a larger housing, you are basically shifting the powerband up further. IF you put too large of an exhaust housing on your turbo for your setup, your will have turbo lag and suffer high EGTs until you get the turbo into its workable range. Hope this answers your question.

If you’re talking about the K31, no - it won’t fit, they use different turbine wheel sizes. Only wastegated housing that I am aware of that’s going to work here is the 1.65 (174962)

@@momentumworx thx caz the k31 has a unique sound when u let go off the throttle when str8 piped whats that sound it produces?

Hi Michael, the stock acert compound turbos should spool up very fast. If they are sluggish, you may have a boost leak or other issues going on. I would recommend having someone take a look over it for you

Assuming stock injectors and cam. I’d go with an S410SX - 78MM with 1.32 exhaust housing

Holset He500

Our billet S475 will support 550WHP (600+ crank)

Pretty much. Main difference between the two, is width of the shaft bearing spacing.

the 11 blade only comes in a 75MM. If you'd like a higher blade count, you can do the BorgWarner SX-E in a 76MM or 78MM, both are billet 10 blade wheels.

@@momentumworx is there a option to upgrade the chra

We don't have a ton of experience with the small cam and big cam cummins. We do a little work with the N14, we will drop a video on that later on

@@momentumworx well hopefully later on you guys will have turbo options for the small cam and big cam Cummins and n14

High egts means not enough air

yes, email us the part number