Date: Fri, 08 Aug 2003 12:50:12 -0500 From: quick sale <trimper+usenopsamcop.net> Subject: Re: Saab 99 buying advice?
Grunff wrote: > davehinznopsamcop.net wrote: >>> Did the later 99 turbos have an APC then? >> I don't think so, but I can't remember how it modulates boost. (yeah, >> wastegate, but how does it manage anything? Does it?) > No APC. There's a turbo overpressure switch which cuts the fuel pump > when the pressure goes above the preset (10psi). The rotor arm also has > a centrifugal RMP limiter. All dead simple. Right, sorry, my brain mistyped. Test the fuel pump cutoff. YOu'll know when it's working: the first time will scare the crap out of you. You'll think you just killed the engine. I've seen a few 99Ts where this switch was bypassed for increased boost, rather than going with a higher pressure valve switch.