Date: Sat, 29 Nov 2003 14:17:17 -0400 From: Dexter J <lamealameadingdongnopsamlamelame.org> Subject: Re: Turbo Hose (Intercooler to Throttle)
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. 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. Currently, I trying to figure out if I can graft my 89 9000 turbo onto a 94 900 with a 2.3 non-turbo engine. It has a good old distrihutor so I can mess with the timing a bit. I think it may just be possible using a manually adjustable wastegate if I'm willing to do a lot of surgery on the header and perhaps replace the pistons - or not - perhaps it's just not reasonable as I've been assured by the good folks Abbot.. -- J Dexter - webmaster - http://www.dexterdyne.org/ all tunes - no cookies no subscription no weather no ads no news no phone in - RealAudio 8+ Required - all the Time Radio Free Dexterdyne Top Tune o'be-do-da-day The Razorbacks - Can't Keep my Baby in Shoes http://www.dexterdyne.org/888/195.RAM On Fri, 28 Nov 2003 22:28:19 GMT, Dave <dspearREMOVE99canopsamo.com> wrote: > 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" <pjghnopsamyonder.co.uk> wrote in message > news:BBED4B48.B5DD%pjghnopsamyonder.co.uk... >> 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 >> http://saab.go.dyndns.org/ >> > >
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