I know that with compression tests consistency is more important than the actual reading because it will be affected by engine temp and the gauge. I got my engine compression tested in January and got readings of 190 all across. I did it again at a different shop this past week and got 140 across, after boosting for almost 6 months. Could this difference be explained by the engine being warm once and cold the other time, or do you think the turbo has done that much damage? Does anyone else have results from a compression test on an F23?

 

it only depends on engine block temp. i could see maybee 10-15 psi difference between hot outside and cold outside. but 50, is alot. theres prolly something goin on. make sure ALL the plugs were removed that makes a huge difference. try adding the oil into the pistons 1 teaspoon, to see if the compression goes up if it does then uve got worn rings.. hell u prolly know this crap already. maybee the valves are out of adjustment timing could be advanced too far.