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Date: Sun, 29 Jun 2003 10:25:06 +0100
From: Grunff <grunffnopsam.com>
Subject: Re: Fuel Over-Pressure Switch Questions


Paul Halliday wrote: > Hi guys and gals, Hi Paul > How exactly does the fuel over-pressure switch fit together? Which bit it > is? Follow me through here ... I don't believe the C900 ever came with a fuel over-pressure switch. > Here's what I have: > > From the engine bay, there is a vac line that comes through into the LHS > footwell. This has a Y junction with two short vac lines. > > One goes to some kind of device that has no other vac input or output and > two electrical contacts on the other end of it. It's black and about 1.5 > inch long and perhaps 30-35mm diameter. Sounds like the APC pressure transducer. > The other short pipe goes to another device with three electrical terminals > (only two are connected) and another vac pipe comes out of that device and > runs along to the dash boost gauge. This device is silver and slightly > larger than the above. No idea what the second one is... > I have my dump valve and shortly I will have an uprated wastegate actuator > fitted and I really want that 1 bar boost :) Now I've reconnected all the > vac lines as they were, 0.6 bar seems so boring :( > > What do I do to disable the switch? Do I need to find the vac line that > connects to the dash boost gauge and connect that directly with the vac line > that runs from the engine bay? This will leave both devices I mentioned > without vac feeds. What about the wiring? Is it a simple matter of getting a > short wire with blade terminals of the right size and simply plug both > terminals together on both devices? Are you saying you want to disable the APC pressure transducer? Is that a good idea? It is generally accepted that if you want more boost, then you modify the APC to give you more boost. Am I missing something? <http://www.saab9009000.de/htmlforum/nospamlink10.htm> -- Grunff

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