compression test

[love4GT-R]

when getting a compression test done what kind of range am i looking for thats a good strong motor.

[Turismo]

service manual says:

at 300rpm

171psi is standard
128psi is the limit
14psi variance across all cylinders.

From what i've read on the internet 150psi and up is good.

[GTR-Dad]

Bear in mind those numbers are for the OEM 8.5:1 compression ratio and OEM cams.

You'll get lower numbers if CR is lower or if there's intake/exhaust cam overlap.

Dan

[GT-RJules]

how much does a compression test cost?

[mcfly]

service manual says:

at 300rpm

171psi is standard
128psi is the limit
14psi variance across all cylinders.

From what i've read on the internet 150psi and up is good.

140~ is healthy and most common


and you have to assume you are getting a 300rpm crank speed.

[PH_Motorsports]

how much does a compression test cost?

from a shop ? 1/2hr labour... ??
Its a good tool to have, just buy a tester at crappy tire for $20, and do it yourself, or borrow someones

[m_melen]

disabling fuel pump for test

out of curiosity, do you guys take out the fuel pump relay or disable any other circuits when doing a compression test?

[NismoS-tune]

I'm actually doing one tomorrow night since I was running no ignition on #4 for a bit where fuel washed the cylinder. Picked up the tool today. Funny this post appeared. I just pull the fuel pump fuse, run the car till it dies a few times and pull all the coils and plugs out a once. Takes me an hour or so to pull everything out and back in.

[m_melen]

cool beans. thats the way i was taught to do it, just wondering what other people thought.