Hi all Skyline professionals, really need your advice:
Sound seems coming from below the shift stick (It's a manual gear GTS-t S2) during driving when the rev starts from 3,000 rpm. It is a frequent 'dak dak dak....' sound, like some rotating metallic parts hitting something quickly. The frequency of the 'dak dak' sound grows with the rev rpm. It happens only when I push on the gas pedal. Once I release a bit (not even fully putting off my foot away from the pedal), the sound goes out, even above 3,000 rpm.
The car is quite original in terms of power and drivetrain: stock engine, stock turbo and stock gearbox. Only a Nismo Single Clutch and a C's short stroke are installed and have been used for about 4 years. The sound appears actually about 1 year ago. I thought it was due to the aged clutch and is therefore replaced recently full set including flywheel and the bearing comes along with the package (Nismo Coppermix Single Clutch). The situation still not solved.
Anyone have similar experience? Please help.
Anderson