Well i decided to do a compression test as i'm having to do alot of repairs on the car as it has been sitting over a few years now. So when i did the compression test the numbers read 175, 165, 165, 160 WTF!

Any ideas what this could've been caused by?. I'm doing a valve adjustment on it today.

Thanks guys

 

Warmed engine?
WOT?
Shitty gauge?

 

Did the valve adjustment help? Maybe one of your valves are set too tight causing the valve to stay open without having an adequate amount of time to seat.

 

Those numbers sound fine to me. My Type R still put down 163whp in stock trim with same compression results w/ only 5-8% leakdown in all 4 cylinders

Do a leakdown test as well