Date: Tue, 7 May 2002 07:42:41 -0400
From: "KeithG" <>
Subject: Re: Turbo Dump Valve

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" <> wrote in message > 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 > >

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