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there appears to be no deffo way to tell between r33 series 1, series 2, and r34 turbos ... i have seen numerous tubs and the only markings are 45v1 through to 45v4, there seems to be no way of saying that an r34 is a v4 and a series 1 is a v1, i have seen v4's on s2's and v2's on r34s !!!

go figure ...

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The R34GTT turbos are made by Hitachi, the R32GTST turbos are made by Garrett (Air Research). The R34GTT turbos have plastic compressor wheels and ceramic turbines, the R32GTST turbos have ceramic turbines and alloy compressors.

R33GTST's turbos are a problem, generally speeking S1 turbos are made by Garrett and have ceramic turbines and S2 turbos are made by Hitachi and have plastic compressor wheels and ceramic turbines. But I have seen S2's fitted with turbos made by Garrett with the usual ceramic turbines.

Hope that was of some help:cheers:

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