56/41.5 in GTB2056v - Alfa Romeo Forum
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(Post Link) post #1 of 5 Old 30-12-17 Thread Starter
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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.
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File Type: jpg Cubi Turbo Servis - 3.jpg (157.4 KB, 35 views)
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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 60mm downpipe from Jol, 3.5bar MAP, injectors and 80mm MAF from 2.4 JTDm, 60mm 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.
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I'd really love to see this GT project documented in a thread of its own
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(Post Link) post #3 of 5 Old 30-12-17 Thread Starter
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I will try that... Only two steps missing for completion of all "reasonable" things - clutch (in a few next weeks) and WMi (in a few next months).
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(Post Link) post #4 of 5 Old 19-04-18 Thread Starter
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Unfortunately yesterday I had serious GTB2056v failure: two compressor's blades were partialy ruined and normal driving was impossible.

Few weeks ago I noted well known turbo whistle (after freeing of accelerator pedal) and yesterday, after test drive (following repair of injectors in local workshop) whistle become siren and this was sign of compressor end.

Question is: what is main reason for problem? Non enough oil pressure or some instant abort in oil flow/pressure or bad material of compressor wheel (Mellet, cast)?
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(Post Link) post #5 of 5 Old 21-04-18 Thread Starter
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Problem solved and all are similar as in previous state...
Maybe responsiveness could be better, but it is simple
for adjustment by little shortening of bar of vacuum regulator.
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