En efecto, es un Garrett GT1749V (no entiendo nada).
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Si hacemos caso a esta lista:
Exhaust Bore size:
36.60mm A/R=.65 on GT1749V and VNT15
37.26mm A/R=.61 on GT1749VA
38.23mm A/R=.61 on GT1749VB
38.65mm A/R=.62 on GT1749VC (Third generation vane)
40mm A/R=.74 on GTB1756VK (Third generation vane)
42mm A/R=.64 on GTB2056VL Volvo (Third generation vane)
43mm A/R=.59 on GTB2056VK Q7 (Third generation vane)
44.5mm A/R=.74 on GTB2260VK (Third generation vane)
Compressor Exducer size:
44mm trim=55.6 (32.8mm inducer) A/R=.46 compressor old VNT15 AFN and early AHF
49mm trim=44.8 (32.8mm inducer) A/R=.46 compressor GT1749V and VNT15
49mm trim=48 (34mm inducer) A/R=.46 compressor GT1749VA
49mm trim=54 (36mm inducer) A/R=.46 compressor GT1749VB
48.9mm trim=55.1 (36.3mm inducer) A/R=.50 compressor GT1749VC
56mm trim=55 (41.5mm inducer) A/R=.45 compressor GTB1756VK
56mm trim=50 (39.6mm inducer) A/R=.45 compressor GTB2056VL Volvo
56mm trim=55 (41.5mm inducer) compressor GTB2056VK Q7
60mm trim=55 (44.5mm inducer) A/R=.45 compressor GTB2260VK
Tu turbo es el peor de todos (el más pequeño) incluso más que mi turbo de serie (en rojo).