Compression test numbers range

DIVIDES

MEMBER
2015 SUBARU WRX
4 CYL
TURBO
4WD
MANUAL
51,000 MILES

What range of numbers should I get on a compression test on these cars? And what PSI difference between cylinders is considered okay?

Monday, April 4th, 2022 AT 6:49 AM

1 Reply

BORIS K

MECHANIC
764 POSTS

Hello,

The compression values are between 170-210 PSI with a maximum deviation of 14 PSI between cylinders.

Compression test should be conducted with the engine at operating temperature with the accelerator pedal fully depressed. Compression values will differ, depending on altitude.

Cheers, Boris