Date: Tue, 7 May 2002 10:14:24 -0400
From: "KeithG" <noonenopsamhlink.net>
Subject: Re: Turbo Dump Valve


'tis true I did not catch that it was an 8V. I am too used to what we get here and the last year of the US 8VT was '84. My '84 did not have a recirc valve (or an intercooler for that matter). On the CIS injection, doesn't it rely on the flow of air across a flap to regulate fuel injected? If so, it would be a similar deal with excess fuel during a dropped throttle event. What sort of boost pressure are you running? The Bosch valve is not too bad as long as you are not running greater than stock 16V boost levels. If you are looking to increase performance, there may be a better start point than a atmospheric dump valve, unless you really just want the noise maker factor. KeithG "drabux" <drabuxnopsamail.com> wrote in message news:3cd7de11_1nopsam.greennet.net... > Since it is an 8v model it won't have and AMM and therefore there should be > no problems with an atmoshperic dump valve. > > Alanb > "KeithG" <noonenopsamhlink.net> wrote in message > news:ab8eg8$hmb$1nopsam.atl.mindspring.net... > > Get a 'piston type', but keep it as a recirculating system. If you have it > > dump to atmosphere, the air which was metered by the AMM will be dumped > and > > there will be a rich period which may affect Catalytic converter life and > > could possibly affect your passing emissions test next time through. There > > are piston type valves which hook into the existing piping. I suggest > these. > > > > the violent vibration may be due to a worn out rubber bit somewhere. Look > at > > the engine mounts, a-arm inner bushings, etc. Also inspect the ball joints > > and tie rod ends for wear. Your shudder may also be totally electrical in > > nature. Look at plug wires, rotor, cap, coil,ignition amplifier and the > > connector on the side of the distributor. > > > > Good luck, > > > > KeithG > > > > "Paul Halliday" <pjghnopsamail.com> wrote in message > > news:B8FD4EB0.102FC%pjghnopsamail.com... > > > Hi, > > > > > > After some research and a lot of reading, I am thinking of replacing the > > OEM > > > plastic recirculation valve on my 1989 900 APC Turbo (8V B201 engine) > with > > > an atmospheric dump valve. > > > > > > The reading that I did came up with a fairly even split between those > who > > > consider this an absolutely necessary replacement and those who say > leave > > it > > > well alone. > > > > > > What are your thoughts? > > > > > > I'd like to hear from drivers who have made this replacement, especially > > > from those who have fitted the Trent Saab atmospheric dump valve which I > > am > > > most likely to buy. > > > > > > Do I need to make any other replacements as well, say fuel pressure > > > regulator or waste-gate actuator? > > > > > > TIA, > > > > > > Paul > > > > > > 1985 900i 16V > > > 1989 900 Turbo > > > homepage.mac.com/pjgh > > > > > > > > >

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