Date: Wed, 08 May 2002 08:35:36 +0100
From: Paul Halliday <>
Subject: Re: [WAS: Turbo Dump Valve] NOW: Possible Performance Increases

Thanks again Keith. The Turbo Team Europe site was very interesting. My classic turbo does have an intercooler, a twin pipe Saab sports exhaust and a whale-tail spoiler. Basically, it's an 8V Aero (or SPG? for the US among us) lookalike :) A low restriction air filter doesn't sound like a good idea? I have seen K&N cones fitted to 16V Saab 900 turbos, housed in the N/S wing/fender, but mine has a N/S wing/fender scoop passing into a "bucket" with a cirular air filter which I intend to change about every 5,000 miles along with a good quality oil change, as I have done with my other Saabs. The car is quite new to me and in very good nick, so I'd like to keep it that way. No unnecessary mods, hence the caution over the dump valve which I have read can prolong the life of the turbocharger. Regards, Paul 1985 900i 16V 1989 900 Turbo ... the car in question is Orca - the Killer Whale :) I'll get some engine shots later ... in article ab9d2o$9le$, KeithG at wrote on 07/05/2002 21:24: > Simon has a web page as does Eric vanSpelde and there is a bit of info > there. The dump valve becomes a performance increase only when it cannot > hold the pressure against it and it bleeds off pressure in the intake > manifold. Did your car come with a dump valve? Does it have an intercooler? > An intercooler would be one way of improving power. One can be had from a > wrecked T16 (did I get the lingo right?) You will need the other turbo pipes > as well. Some speak of low restriction air filters as a means to HP > increase. These scare me. Other possibilities are with the APC system. There > is a simple modification possible on these as well. I am assuming that yours > is the same as the APC on the T16S, but am not sure. > > (Eric's page) > > http://www.nospam/home.htm > > Regards, > > KeithG > > "Paul Halliday" <> wrote in message > >> in article ab8nlq$4qq$, KeithG at >> wrote on 07/05/2002 15:14: >> >>> '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 >> >> Sorry, I didn't make it clear that it is an 8V. In the UK, the C900 Turbo > is >> an 8V - the 16V'ers are usually called 900 Turbo 16V. >> >> I'm not *that* fussed about a performance increase. I'm very happy with > the >> boost curve and the delivered power. I have actually had the boost turned >> down due to an over-boost problem. I presume that with a more more >> responsive dump valve the boost can be upped again? >> >> The noise factor is kewl - I can pfwooosh like the Escort RS Turbo nuttaz > :) >> >> Nah, not that bothered - I'm more keen on prolonging the life of the >> turbocharger and the car generally. The 155HP is good enough for me - it >> makes a nice motorway cruiser, which is why I bought it. Out of interest, >> what can be done to increase performance? >> >> Thanks, >> >> Paul >>

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