I havent had 18-20 inches of vac since i ran a bone stock motor in my 82... My turbo car only gets about 11 at idle with a goofy E cam, hell my 357w only got 4.5" with the big duration stick that was in it. Don't use such a blanket statement sending him on a wild goose chase. Maybe he does have a vac leak, but he could be there for 20 god damn years trying to make 20" of vaccum.
We couldnt get the BOV to work origionally on mine when i put one one, i was using some ching chang meow rubber hose, turns out it was collapsing on the transition from boost to vac. Just more things to check out.
you should see around 18-20 inches at idle, track down the leak before doing anything. Make sure the wastegate is run off the turbo so it always has an accurate reading, bc if its hooked to all the other vac stuff and there is a leak the wastgate will get a faulty reading and overboost and hurt the motor.
-1982 Mustang GT, T5, 3.73s, EFI'd 408W, soon to be parted and retired
-1991 Notch, numbers matching 2.3l auto, all motor!
-2003 DSG Cobra, 2.8, intake, exhaust, tune, basics.
Last edited by PurpleGT; 08-08-2009 at 03:05 PM.