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With spot on tuning the RB 26 stock bottom end is able to take anywhere upto 1.8/1.9 bar. Even with larger turbo's, however compression must be lowered and fuel upgraded.
Standard GTR turbo's are physically not able to take more than 1 bar. if you are doing so, you are very lucky the exhaust wheel is not falling off YET! This is a fact. It has nothing to do with timing just the way it is made.
Lastly, to sustain higher power outputs, the engine has to be running at optimum levels, oil changed maxmimum every 5,000kms, inlet temp lowered (I/cooler) and engine oil cooled as it will help with the cooling of the pistons and running gear. FYI, RB26 Pistons have an oil squirter that squirts oil to the pistons to cool it down. Only other thing u have to worry about is the breaking of the running components. Ive done 2 transmissions, 1 rear diff and clutch in less than 10,000kms. My torque figures are abve 60!
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