Agent_D

iTrader: (2)

i did a compression test on my auto today, front and rear rotor were making 60psi on all 3 sides of each rotor, is that good or bad?? im planning on doing the ATF trick on it in a few days. should it be higher than 60psi with 170k miles??

forgot, im at 5500ft elevation

vosko

iTrader: (4)

i think 100 psi is supposed to minimum in specs compression.

mazdaspeed7

Should be at least 80-90 PSI. Excellent compression is 120-130 depending on year(for n/a's)

Scott 89t2

I bet you did it wrong, was the gas pedal floored? was the valve needle in or out? I took the needle out on mine like I was told and only got like 50, but with the needle in holding pressure I got 100. it all depends on the gauge.

Agent_D

iTrader: (2)

no i didnt have the gas pedal floored, didnt know it had to be floored, just had the valve depressed to let the air out, it was bumping up to 60psi per bounce.