Date: 13 Jan 2002 00:58:04 -0800 From: johsnopsamanytime.co.uk (Johannes H Andersen) Subject: Re: Saab turbo boost controller
johsnopsamanytime.co.uk (Johannes H Andersen) wrote in message news:<1ec6845d.0201120529.52fc363dnopsaming.google.com>... > "Curt Brown" <cbrenopsami.com> wrote in message news:<2zV%7.10876$Vq.77100nopsamnsc53>... > > Manual boost controller, unit is like new, includes instructions, every psi > > of boost extra is 7-10 HP, nice cheap mod, asking $75 shipped. > > Not such a good idea. If you override the dump valve, the system will > switch off the fuel pump! > > Johannes Reply to Bob who wrote: "The trick is to adjust the boost controller so that the boost comes up just below the level that triggers fuel cut. That way you maximize the boost without causing run problems. In practice, you can only hit fuel cut if you run wide open anyway. Properly adjusted, the boost valve will give you much more boost more quickly, which is the real advantage over the ECU controller which starts dumping boost immediately in order to provide a smoother throttle curve. Response is much better with a manual controller on 1999 and earlier models. Results on the later (Trionic ?) controllers have been mixed. An ECU upgrade is better but costs $500 to $1000 USd. Bob" Hope you don't mind Bob, it appeared on my news server, but not on groups.google . I prefer having the smooth throttle curve as long as I can access full power when necessary. It is better than some Volvos that have a sharp throttle action. The purpose of dumping boost early is to keep the turbo spinning, thereby reducing turbo lag. I would imagine that the device is difficult to adjust; fuel cut off is unpleasant and can take you by surprise. Hope you don't take this the wrong way, I have a habit of asking questions. Any turbo control system is quite delicate... Johnanes
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