compression test question

[aboturky839]

hi everyone how are you doing so i bought a nissan cefiro with RB25DET swap bone stock engine and have been using the car normal but sometimes hard for about 1 month and had never did a compression test, opened the oil cap or make sure if white smoke came out from exhaust long story short i went and installed standalone link ecu changed sparks plugs and did the 1NZ coil pack swap then started tuning the car at 9 psi when doing a load run the car build boost for 9 psi then at 4500 rpm it go down to 5 psi stopped tuning and when to do a compression test with the car warm all spark plugs out but not WOT dry no oil and it read 120-121-120-145-123-120 installed everything back and reved the engine white smoke came out from exhaust but no to much what does this mean and does the tuning had any effect ? thanks

[KiwiRS4T]

Compression test is not flash but plenty of cars will go for ages like that. Loss off boost - check for leaks. Could be turbo on the way out. Why did you install a Link? Don't think you will make 500hp with an engine as tired as yours!

[SkudR33]

Compression test is not flash but plenty of cars will go for ages like that. Loss off boost - check for leaks. Could be turbo on the way out. Why did you install a Link? Don't think you will make 500hp with an engine as tired as yours!

I gotta agree with you on that one - those compression numbers are not too healthy!