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Momentum Worx

Detroit Series 60 12.7L | 75mm ULTRA K31/GT42 Hybrid Turbocharger

(20 reviews) Write a Review
SKU:
MMWX.K31B
MPN:
MMWX.K31B
  • Front top view of the Momentum Worx 75MM ULTRA Hybrid K31/GT42 turbocharger showing the compressor cover and large compressor inlet.
  • Side view of the Momentum Worx 75MM ULTRA turbocharger showing the compact compressor housing, center section, and 1.15 A/R divided T6 exhaust housing.
  • Opposite side view of the Momentum Worx 75MM ULTRA Hybrid turbocharger highlighting the compressor housing, center section, and turbine housing for Detroit 12.7L Series 60 applications.
  • Rear side view of the Momentum Worx 75MM ULTRA turbocharger showing the 1.15 A/R exhaust housing and compact K31/GT42 hybrid configuration.
  • Alternate side view of the Momentum Worx 75MM ULTRA Hybrid turbocharger showing the compressor housing, center cartridge, and 1.15 A/R turbine housing.
  • Top-down view of the Momentum Worx 75MM ULTRA Hybrid turbocharger focusing on the 1.15 A/R exhaust housing and divided T6 turbine inlet.
$1,199.00

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Description

Detroit Series 60 12.7L | 75mm ULTRA K31/GT42 Hybrid Turbocharger

The ULTRA Turbo upgrade for Detroit 12.7L engines takes the guess work out of finding the perfect turbo size for your stock or lightly upgraded 12.7L Detroit Series 60 engine.
 
This turbo takes advantage of a very efficient turbine and tighter exhaust housing to provide quick turbo spool up while having a large compressor wheel to still make tons of boost pressure and CFMs.  While many folks want to upgrade to the famous "702" turbo, or BorgWarner 171702, the 12.7L Detroit engines often struggles to spool the 702 because of the larger turbine.  The ULTRA turbo gives you a similar sized compressor wheel, mated with a smaller turbine wheel and housing that your Detroit 12.7L can actually light, giving you power right away instead of high EGTS and terrible turbo lag. 
 
Specs
Compressor Wheel: 75MM/102MM (Billet 6+6)
Turbine Wheel: 82MM/75MM
Exhaust Housing: 1.15 A/R (Divided T6)
 
What makes the ULTRA different from a K31 or GT42?
The BorgWarner K31 (172732) is a very common replacement for the Garrett GT42, as it consolidates many GT42 turbos into one K31 part number. 
While the BorgWarner replacement does feature an upgraded billet wheel, its only a 71MM inducer, opposed to the larger wheels available previously with the GT42. The K31 is also a much bulkier frame then the GT42 which can be an issue for tighter engine bays or any application with minimal fender/frame rail clearance.
 
The ULTRA Hybrid combines the best of everything from both the GT42 & K31:
-Compact Frame
-Billet Wheel
-Massive 75MM Inducer
-Efficient Turbine 
 
Simply a FANTASTIC upgrade for your stock light modified 12.7L Detroit Series 60 Engine 
 
Rest assured that we stand behind this turbo no matter what you do to it: as the ULTRA comes with the MOMENTUM WORX unlimited warranty, which means we will replace it one time for ANY REASON, no questions asked - within the first year.  
 
 
If you have any questions at all - please feel free to call us at 215-237-9672 or email us at Info@momentumworx.com
 
 
Cross Reference Numbers for the stock turbo:
23522188 23526679 23523040 0R7575
23522189 23528052 23525462 0R7578
23522190 23528059 23525464 0R7579
23522312 23528062 23526682 0R7292
23525463 23528064 23526885  
23526016 23528065 23528055  
23526271 23528069 23528058  
23526272 23529103    

 

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20 Reviews

  • 5

    Turbo

    Posted by Thomas stephens on 29th Oct 2026

    As expected

  • 4

    Upgrade 12.7

    Posted by EJ on 14th Oct 2026

    So I can definitely feel the difference in air flow and the Rig is not as sluggish. I believe I may need an ECM tune because I've already upgraded the injectors,cam and exhaust. I thought this would seal the deal and I'd feel more power. Maybe a few more steps and we'll be solid.

  • 4

    Turbo drain gasket

    Posted by Wjwiseman72@gmail.com on 2nd Oct 2026

    The ultimate 12.7 Turbo seems to do everything a little bit better.The turbo drain gasket was poor quality ended up having to go to Detroit for an o.E one

  • 5

    Works great

    Posted by Brent on 1st Aug 2026

    Quick spool up

  • 5

    Turbo Review

    Posted by John on 12th Jun 2026

    amazing. Shipping was fast! Turbo preforms perfect exactly how the customer was wanting it!

  • 5

    Great turbo

    Posted by Anthony on 19th May 2026

    Just recently swap my 171702 for this hybrid turbo and the difference is day and night, thank you for this setup no more turbo lag and super quick spool on my 14l series 60 would recommend ?

  • 5

    Perfect combination

    Posted by Rob on 12th May 2026

    Boost is back , power is back and egt is down. Mpg is up. Power when you need it threw all the ranges

  • 5

    Power

    Posted by Alex on 31st Mar 2026

    God bless a person who designed this turbo, I just installed it on a 2015 Paccar MX-13 EP-13 vgt valve is out of work obviously, I am truly impressed by the fuel economy and the peak acceleration a truck have when starting from a standstill, a program on my truck 455Hp - 1850 torq

  • 5

    hybrid turbo

    Posted by Larry on 27th Mar 2026

    gained 4 to 5 lbs. boost and 1 complete gear on the hills. Runs great and you won't be disappointed.

  • 5

    Power

    Posted by Greg on 24th Feb 2026

    This turbo makes great power fast. Very smooth

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