engine parts cleanup always makes performance difference.
you see: as time passes, dirt and shit accumilate bit by bit on your intake, spark plugs, TB, etc... and you don't feel the power beeing robbed because it is very little bits stolen from you over long period of time.
when you do clean up any of those parts, the power is restored back so whatever the dirt too in a year the cleanup gets it back in a scrub of a tooth brush and you will feel the difference for sure.
i remember when i cleaned my TB, spark plugs and intake the car felt like it was 10 years younger and was fast as hell... i even empressed one of my friends who has a '99 Lanos just like mine and his car got less Kms than mine yet when he tried my car he said "Damn... your car is lot faster than mine!"... apparently he never cleaned up anything on his car.
most of the dirt and buildups in the TB and intake are from the crank case breather, it keeps on oumping oil vapor into the intake and because oil is heavier than air it condenses on the intake walls and form buildups. it also catches any dirt particles that found its way through the air filter and add up to the buildups.
A pic of a dirty VGIS intake
i think the use of an oil catch can will help prevent such problems... can anyone who have an oil catch can confirm if he has a clean TB and intake?? i mean in comparison with non oil catch can cars... my TB always looks black as hell from the buildups but WD 40 works wonders!
as for washing the car body and stuff... thats purly psychological... i do feel that when i wash the car... hell it even felt faster when i greased the shift stick mounts!
MMamdouh