To err is human,but
feel is divine...
Join Date: Feb 2008
Location: Novi Sad
56/41.5 in GTB2056v
Change of compressor wheel from 56/39.6 (Garrett?) to 56/41.5 (Mellet, cast) is performed yesterday in local turbo workshop "Cubi" (thanks for Vlada & Laci). At the same time, some repair of other parts of GTB2056v was made.
Regards to this wheel change only necessary is adjustment of inner surface of compressor housing because of different measures of new trim 55 in comparison with old trim 50 wheel.
Bottom picture shows results of balancing made by micro-grinding of wheel nut. In opposite to "basic factory wheel balance" dark line, red line represents balance improvement: approx. 0.1g-0.2g in wide range of RPM and 0.5g between 150k-160k RPM.
Before test (will follow installation of Stage 4 Feramic Clutch), some impressions in driving: no smoke, no turbo whistle in low temperature start of driving, no evident turbo lag, same or better driveability.
Alfa GT 1.9 JTDm 16v + Q2: Remap by Gregor (+240HP/≈470Nm); GTB2056v with 56/41.5 compressor wheel, 700x140x65mm FMIC, Stage 4 Feramic clutch and Ø60mm downpipe from Joël, 3.5bar MAP, injectors and Ø80mm MAF from 2.4 JTDm, Ø60mm air intake pipes, BMC CDA 85-150 with custom duct, zirconium treated exhaust manifold, free flow mid silencer.
Removed: butterfly valve, swirl flaps, EGR and heat exchanger, oil vapour air intake, 1st & 2nd cat, DPF & back silencer.