So I brought my 2012 STI into Vex today for a compression / leakdown test, I was a little curious about some seemingly excess oil consumption, and I want to be prepared before I start modding it for more power. The results were as follows;
#1 - 120psi - 3%
#2 - 120psi - 3%
#3 - 120psi - 3%
#4 - 120psi - 6%
The leakdown results obviously seem within spec, and it's my understanding that cylinder 4 is always the worst, so no problems there right? Well I'm a little confused about the compression. I thought it should be up around 140psi shouldn't it? Would there be any reason for them to just take it up to 120 and stop? I know the car sat outside for maybe 30-45 mins before they actually started, but I don't know what the range would be like between hot and cold engines... I would have inquired about this while I was there but I didn't really look into what the results should be until I got home. Has anyone else had this done at Vex, and maybe able to offer some input here? Thanks.