Quote:
Originally Posted by COSMO
If the gears were such an issue why isn't there any kind of tsb's from Nissan?
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Probably for the same reason there has never been one for the fuel pump, CSC, or engine temperature. This is a one of the car's glass jaws that becomes apparent when the car is driven to the limit. If you stay under the stock redline, there should be no issues.
One way to see where the reliability issues are in the VQ37 is to compare it with the VR38. As I understand it, the crankshaft can deflect at high RPMs and the crank-driven pump is vulnerable to the harmonics generated at those RPMs. The VR38 uses a chain-driven pump to prevent this issue.
NISMO makes an uprated pump, but it doesn't solve the root problem, and is only reliable for a few runs past 7800 RPM. During the Z33 era, the Z was Nissan's flagship racing platform and NISMO developed lots of race-hardened parts not just for their own efforts, but for customers as well. These days, the R35 is the motorsports platform and it's up to the aftermarket to support the Z34.