Nice little road trip 3 weeks ago, NY to VA, in the '89 Shelby. When I get there I notice a new noise, seems that when the boost comes in there is a howling-whining noise, not screaming loud, but definitely noticeable. Kind of like a soft train horn. it's there from when the boost starts to about 6 psi
. above that you don't hear it. Oil level (synthetic) is good, gave a quick look and didn't see any vacuum lines off, car ran fine. SO is this the sound of impending turbo doom, or just some quirk I have hunt down?
Update: Changed the oil (Mobil 1), found a hose off on the aircleaner box, reattached that, repositioned clamp on intercooler bottom hose. Noise is still there, somewhat softer though.
BTW, if I were to put the car on a lift and run it with the wheels off the ground, would I be able to build up boost or would the lack resistance to the engine prevent that?
(it's an "89 Shelby TII 5 speed (essentailly stock)