Date: Thu, 25 Aug 2005 17:25:09 GMT
From: Paul Halliday <>
Subject: Re: Massive Loss of Oil... Did I kill her? (loooong)

in article, Dave Hinz at wrote on 25/08/2005 16:42: > On Thu, 25 Aug 2005 09:32:05 +0100, Grunff <> wrote: >> Chris Campbell wrote: >> >>> A few days ago I installed an MBC+A in my beloved '94 Saab 9000CSET (An >>> MBC is a manual boost controller, for those of you who aren't >>> performance savvy... I bought it to replace a bad BPC so I'd get stock >>> boost levels again). >> >> I'd like to take this opportunity to ask a question (and I'm not having >> a go Chris, honest). Why do people install MBCs on APC equipped Saabs? >> What exactly is the point? > > Because they think they can modulate boost faster than a few hundred > times a second, I suppose... MBCs can't even claim to allow greater power that APC when APC can be altered with a couple of solder-on resistors and a higher rated potentionometer, it can control boost right through to over 1.5 bar! The only "useful" use for an MBC is if people run an untampered APC setting for the road/daily driving and have their wastegate set correctly to 0.32 or 0.35 bar. The MBC can be deployed to give a higher basic boost of up to, say, 0.5 bar to run alongside a modified APC box (basic boost should be about half desired boost). Once finished with the modified box - say, at a track day, the car can be returned to road/standard setting without having to wait for the turbo to cool down to reset the wastegate actuator. Paul 1989 900 Turbo S

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