Hey guys today I did a compression test on my R32 Skyline GT-R. Follow me along in the process and learn for yourself how to perform a compression test on your car engine.
You perform a compression test when you want to know the health of your engine. While compression can vary from engine to engine, it's a universal concept.
For the RB26DETT that I tested, stock compression is about 170psi right out of the factory. Regardless of your results, you don't want a deviation of more than 10% on all cylinders.
When performing a compression test, you must have the engine up to operating temperature, remove all the spark plugs, and when you crank over the starter, you should hold the throttle wide open (floor it) so that the motor gets sufficient amount of air coming in.
Also, you must disconnect the ignition and fuel pump. There are various way to do this, but in my case I just disconnected the ignition coils and pulled out the fuel pump fuse to prevent the car from spraying fuel and firing the coils when cranking the motor.
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