When I get my 1997- 2.3t or aero how would I turn the boost up? With my current car I had a electronic boost controller and set it to where I want. Is it a case of doing it on the APC? And what is safe on this with just an air filter.
Your 2.3T monster runs on an electronic brain called Trionic (Version 5 in the case of the cars you are looking at), which was developed in-house by Saab and was launched in its first version back in 1992. The Saab Trionic system is controlled by a microprocessor which simultaneously monitors and controls the ignition timing, fuel injection, boost pressure and throttle setting. Control is adaptive, which means that the system adjusts the calibrations to suit the continually changing needs of the engine.
The system analyses the combustion process by measuring the ionization in each cylinder by means of the spark plugs. A weak current pulse is applied across the electrodes of each spark plug after every working stroke of the piston. The current sent back to the control unit is dependent on the number on ions formed, which provides a measure of the combustion process in each cylinder. The ionization voltage reveals whether the fuel/air mixture has been ignited and burned correctly. If not, the system adjusts automatically. It is able to control the fuel flow and the ignition timing of each cylinder individually. This is an accurate way of controlling the engine - far better than using averages of measurements carried out at only one point.
This system is fully reprogrammable with software revisions for performance upgrades available from all of the major Saab tuners, in various stages of tune.
You could go the dirty route and fit a manual boost controller (bleed valve) but you'd lose the protection of the Trionic boost control. Or you could have the Trionic reprogrammed, retaining all the benefits of electronic control and providing an optimal boost curve for good performance commensurate with transmission life. If you're looking to achieve a lot of power (300hp or so), then the TD04 turbo on the 225hp engine is capable of supporting this sort of power without modification.
Mine is putting out just over 300hp and a nice wide torque band peaking at 330lbft and with 310lbft all the way from 2500-5000rpm. The car has the standard Aero turbo, JT 3" exhaust and Trionic upgrade from Maptun (my Trionic is bit of a custom job). I've also opened up the air intake a bit.
Speedparts or the like should be able to supply something off the shelf that will give 280-290hp, with a larger downpipe to keep exhaust gas temperatures at a safe level. Their advantage over Maptun is that they have a UK dealer.