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hi i had a turbo problem with my gtr 2 yrs ago at cruising speed in fifth if i floored it between 2000 revs and 4000 revs the car would jerk a small bit and i could hear a dull groaning noise from the passanger side of the engine,i guess you could describe it as a rrrrrrrr noise
also the boost gauge would rise and drop a tiny amount in syncro with the jerking
i spent months trying to solve this problem
the turbos appeared perfect no shaft play or bearing noise
eventually i got so sick of pricking around with it that i ripped out the turbos and got them steeled in turbo technics
even the guy that built the turbos in turbo technics said he couldnt find any issue with the turbos
however when i fitted the rebuilt steel turbos the problem was eliminated
i reckon all it takes is for one turbo to become a small bit weaker than the other to cause problems
thats my opinion
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