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Momentum Worx

75MM ULTRA Hybrid K31/GT42 Turbo Upgrade for Detroit 12.7L

(6 reviews) Write a Review
SKU:
MMWX.K31B
MPN:
MMWX.K31B
  • 75MM ULTRA Hybrid K31/GT42 Turbo Upgrade for Detroit 12.7L
  • 75MM ULTRA Hybrid K31/GT42 Turbo Upgrade for Detroit 12.7L
  • 75MM ULTRA Hybrid K31/GT42 Turbo Upgrade for Detroit 12.7L
  • 75MM ULTRA Hybrid K31/GT42 Turbo Upgrade for Detroit 12.7L
$1,199.00
Frequently bought together:

Description

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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6 Reviews

  • 5

    Above and beyond.

    Posted by Rafail on 7th Oct 2025

    I was looking for turbos for a while and decided to get this bad boy. I will tell you what . I knew my tune was pretty good but the 171701 was a bit not up to spar . Ok turbo but not satisfied. Now let me tell you about the hybrid. 1300 Rpms and the thing wakes up . 1500 rpms and I have 27 lbs of boost when before I could only get 24 . 1800 and I am at 31. I pull anywhere from 140.000 lbs to 210.000 lbs. So I'm normally heavy. Now I can see what my engine and tune are able to do. Way better Jake's . Up to 24 lbs of boost jaking. I wish I had found that turbo sooner .

  • 5

    Good everywhere

    Posted by Robert Redmon on 17th May 2025

    Coming off an S400, top end is very noticeably lower, but spools up much faster. Low and mid power is significantly up. Don't have to get up to 1500rpm anymore before the power really comes on. Start building good boost by a little over 1200rpm. 13 or higher speed heavy haul where your rates are way higher and running over 1500rpm and throwing fuel at it doesn't matter as much, go with the s400. Everyone else, pick up the ultra.

  • 5

    75MM ULTRA HYBRID K31/GT42 TURBO UPGRADE FOR DETROIT 12.7L

    Posted by Lorenzo on 3rd May 2025

    Amazing turbo! I installed it on a 2017 D13 Volvo truck, mechanic did a retrofit to my truck to save money over the OEM Volvo turbo. Turbo spools right away on low RPM and keeps spooling and building boost on the the whole RPM range. Great torque on low and high, feels even better than the OEM VGT turbo. Maybe waranty won't work for me since I didn't installed it on a Series 60, but quality on turbi is great I am sure I won't need it anyways.

  • 5

    Awesome

    Posted by Bruce smith on 13th Feb 2025

    I pull a end dump and lowboy locally this thing is amazing about got awesome throttle responses paired with my full tilt only thing I wish I could got a sticker to put with my fulltilt lol very happy oh yeah 1997 ddec 3 12.7 detriot 430 horse

  • 5

    Awesome

    Posted by Bruce smith on 13th Feb 2025

    I pull a end dump and lowboy locally this thing is amazing about got awesome throttle responses paired with my full tilt only thing I wish I could got a sticker to put with my fulltilt lol very happy oh yeah 1997 ddec 3 12.7 detriot 430 horse

  • 5

    Great customer service

    Posted by Yvan Lacroix on 26th Feb 2024

    This is a great turbo for a 12.7 l series 60. Great spool up, higher boost at lower RPM compared to original turbo. More importantly though is the amazing customer service. Second to none.

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