Date: Fri, 18 Oct 2002 09:04:56 +0100 From: "Andrew Hookins" <andrew.hookinsnopsamamnopsamodata.co.uk> Subject: Re: Saab 9000 LPT, 1993 model, boost
Is this a 2.0l or 2.3l? In '93 the 2.0l would have had Bosch fuel injection and separate SAAB developed APC box. The 2.3l would have had the Trionic combined unit (Fuel, ignition and boost control). Saab developed their APC (automatic performance control) to manage boost pressure and allow the car to use a wide range of fuel octane ratings without any other adjustments. Yes there is overboost fuel cut-off, boost control is a closed loop system. MBCs circumvent the APC system plus there is a good chance of running lean if the fuel map doesn't cater for higher boost pressures. Some lpts have the full APC and some just loop the boost pressure to the wastegate actuator and set a low boost pressure of around 0.45 bar by adjusting the length of the control arm. Some (definitely in the UK between '91/92 and '95) 2.0l lpts didn't have an intercooler. The ECU will reduce boost and retard ignition if it detects detonation. The older APC system uses a traditional knock sensor to detect knock. The Trionic system uses the spark plugs as cylinder pressure sensors - see how: http://www.vehicular.isy.liu.se/~larer/Projects/main.html This might be a good place to start if its a Bosch/APC control system: http://www.scotsglen.com/saab/ecu/ If its a Trionic system your out of luck AFAIK. T-5 uses a Motorola 32-bit processor. The tuners reprogram the boost pressure, fuel cut-off, ignition and timing tables. AFAIK they don't change any program code as such. However, I _think_ that for the 2.3l _only_ you can fit an fpt ecu (and BPC valve if not fitted) to make an lpt into an fpt. ECUs can be had from specialist breakers for around 125 UKP. There are many SAAB tuners around and these may be your easiest route: http://www.abbottracing.com/ http://www.trentsaab.co.uk/ http://www.hirsch-performance.ch/index_e.htm http://www.maptun.com/index.html http://www.speedparts.se/eng/e_index.htm http://www.bsrab.se/se/index.html http://www.rica.nl/frames.html http://www.herrn.com/~sqr/prov/index.html The Saabnet performance bbs may be of help: http://www.saabnet.com/tsn/bb/performance/ AndyH '94 9000 CDE B204 chipped and cooled. "John Banks" <jcsbanksnopsamo.com> wrote in message news:3daf38e9$0$9442$cc9e4d1fnopsam.dial.pipex.com... > What is standard boost on this engine and what can it safely be increased > to? > > Does the fuelling/timing work from a MAF sensor? > > Is there an overboost fuel cut? > > Is boost control closed loop? > > Any links? > > Are manual boost controllers any good on these models? > > At what boost do you have to start worrying about detonation and what does > the ECU do to control it? Does it run active knock control? > > Any other pointers? > > (I remap Subarus professionally, but a friend wants me to turn up the boost > on his Saab so that he can use it on track as a medical rescue car). > > Thanks, > > John Banks > >
 |
 |
 |
 |
 |
