Date: Fri, 28 Nov 2003 22:28:19 GMT
From: "Dave" <>
Subject: Re: Turbo Hose (Intercooler to Throttle)

Hmm, interesting thought. What's the max effective bore of the throttle body with the throttle wide open? Does the flap indeed go entirely horizontal or is it somewhat less than that? I would guess given the engineering that went into this car that a bottleneck which you surmise may exist probably doesn't... otherwise you'd have a lot of people putting bigger pipes on, and given the large number of production 900's (>900,000 worldwide) there would be sure to be kits available. I know the rated steady-state turbine inlet temp (exhaust gas temp) of most variable vane modern turbochargers is around 750C... what the actual exhaust temp is I don't know, but I'd bet it would get hotter than 170C... "Paul Halliday" <> wrote in message > Hi everyone, > > I've been thinking about the metal pipe on our classic 900 turbos that runs > from the stock intercooler to the throttle intake. The pipe is pretty > restrictive both in terms of bore and shape, especially the more angular > type on the 8 valve models with intercooler (Tii models). > > The bore from the air box to the turbo and from the turbo to the intercooler > are pretty wide, but the bottle neck is from the intercooler to the > throttle. > > I've done some measuring. The bore of the rubber connector hose going onto > the intercooler is about 60mm and the bore of the rubber connector hose > going over the throttle is about 70mm. The metal pipe, however is just over > 60mm at the throttle end and a miniscule 40mm at the intercooler end. The > rubber connector pipe actually steps up from that small bore to 60mm. What a > waste! Surely some kind of pipe that curves from 70mm to 60mm in one go > would be ideal. Would it really be that beneficial? > > Okay, practicalities. A 90 degree 70mm bore silicon pipe at one end, a > reducing 70mm to 60mm bore silicon pipe at the other end and a length of > aluminium hose insert of the relevant length in the middle. Sound okay? Th is > would give a full 70mm bore from the intercooler to the throttle, rather > than the poor 40mm. Would that be better? > > Would the silicon (say Samco or SFS) be of the right heat range? Samco make > hoses that are suitable up to 170 degC. Is that sufficient for the air > coming out of an intercooler? > > Whatcha think? > > Paul > > 1989 900 Turbo S > >

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