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Date: Sun, 29 Jun 2003 08:55:10 GMT
From: Paul Halliday <pjghnopsamyonder.co.uk>
Subject: Re: Fuel Over-Pressure Switch Questions


in article BB239943.72B5%pjghnopsamyonder.co.uk, Paul Halliday at pjghnopsamyonder.co.uk wrote on 28/06/2003 19:13: <snip>Fun boosting and HTF does it all fit together?</snip> > 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. This is starting to make sense now. This device is the pressure sender for the APC, right? That's why when I removed the vac line, the turbo effectively just ran as a mechanical device without electronic control. The near 1 bar boost was a heck of a rush, but with APC control, I'm glad I only boosted that high a couple of times. Am I on the right lines here? I can find some reference to this in the Haynes wiring section, so I'll check the colour of the wires today. > 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. A ha! Surely this is the fuel over-pressure switch. Hence, the vac for this device was not interrupted by my fiddling the other day and would still cut the car's fuel at 0.95 Bar. Again, am I on the right lines? I can't find any reference to this in the Haynes, so I'll have to take advice on this one. > 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 :( Best leave it like this until I have the wastegate actuator fitted and know exactly which bit does what. > 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? This is the bit I need advice on. Any help would be very much appreciated. Paul

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