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Date: Sun, 30 Nov 2003 18:12:50 GMT
From: Paul Halliday <>
Subject: Re: Turbo Hose (Intercooler to Throttle)

in article, Dexter J at wrote on 29/11/2003 18:17: > Salutations: > > You know, of the many things that may be odd in a SAAB - I have always > considered the turbo set-up to be second to none. I do not know, but I > wonder if the restriction may be allowing for cooler airmass so that > increasing the pipe size after the intercooler might reduce pressure > and/or induce further turbo lag as pressure is built up in the larger > pipe.. > > I know that they replaced a lot of the rubber parts on the classic 9000 > air intake system with metal parts by 93/94 and I think they did so to > eliminate variations in pressure, or to save money, or to make the system > last longer - only SAAB engineering knows I suppose. Good points. The pipe from the turbo to the intercooler is also metal and presumably 40mm bore. Not much point substantially increasing the bore after the IC when the bore before it doesn't match. > If I were (and may yet) be messing with modifying a turbo system - I would > actually get a couple of lengths of cheaper hose to road test variations > on pipe size - it may be that reducing the pipe would make the turbo > snappier - but reduce total top pressure and perhaps fatally induce > pressure too quickly in the system. I think all things considered, I'm going to look into increasing the bore from the turbo to 50mm. That's about 2 inches and seems to match the exhaust end of the turbo. Paul 1989 900 Turbo S

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