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Discussion Starter · #4 · (Edited)
FWIW, Cummins does not make turbochargers. They buy them from turbocharger specialists. As does probably every other vehicle company....
These 5 models are all 2.4 liter turbocharged 4 cylinder engines, but a turbocharged 2023 Subaru Outback an MSRP of $38,445 to $42,295 while a 2023 NX 350 AWD starts at $44,015 with a premium trim costing $48,475.
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NX 350LEXUS

I was having a discussion as to why the Lexus has an extra 15 hp and an extra 40 lb-ft of torque peaking at lower rpm from the same size engine as the Outback, and we couldn't decide if it had a better turbocharger or simply a function of compression ratio and bore/stroke ratio.
  • 2022 Outback XT 260hp @ 5,600; 277 lb.-ft. @ 2,000 COMPRESSION RATIO: 10.60 : 1, Bore/stroke 94mm / 86mm
  • 2022 Lexus NX350 275hp @ 6,000; 317 lb.-ft. @ 1,700 COMPRESSION RATIO: 11.00 : 1, Bore/stroke 87.5mm / 99.5mm
A Subaru TR690 CVT has a maximum torque of 295 lb-ft, so clearly the Lexus 8 speed automatic has a higher specification.

I am curious who makes the turbochargers and how much it would cost to buy a brand new one (or is the same turbocharger since Subaru Corporation officially joined the Toyota Motor group in February 2020).
 

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The Subaru and the Toyota/Lexus engines have significant differences. Piston layout being the first, namely a flat-4 vs. an inline 4; the flat layout is more compact, and is better-balanced dynamically, but the I4 has a better-synchronized exhaust. The Subaru short-stroke motor is probably better at higher rpm's, but the Lexus has a higher compression and is almost certainly mapped to run on premium gas. Also, piston contour and head design also make significant differences.

Back around 20 years ago, both the Camry and the Lexus 300 used exactly the same 3.0l Toyota V6. The only difference was that the ECU on the Lexus was mapped for 91 octane fuel, and the Camry for 87 octane. The Lexus was rated 20 hp higher, and a lot of people swapped ECU's from crashed Lexus cars and plugged them into their Camrys...
 
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