The SAAB Trionic engine management system was developed for the 9000 and 'New Generation' 900 turbocharged engines. The engine management system was first utilized on the Saab B204 and B234 "H" engines to monitor and control the fuel injection system and turbocharging pressure control.
The Trionic 5.2 and 5.5 systems utilized the manifold absolute pressure (MAP) sensor and the intake air charge temperature sensor to calculate the fuel injection curves, while the Trionic 7 and 8 systems are mass air flow type. Both systems have substantial differences that prevent utilization of components between the two. Generally speaking, engine tuners prefer the easier to work with Trionic 5 systems over the Trionic 7 and 8 which are more restrictive in what can be manipulated within the software.
The intellectual rights to the Trionic 5 and 7 systems were sold in 2009 to BAIC, along with the Saab H Engine that it was designed for, as part of Saab's restructuring and transfer of ownership of General Motors to Spyker.
optional on 00-02 four cylinder models
Trionic systems are shortened to indicate their version; for e.g. T5, T7, T8, etc. The engines with T5 had red direct ignition modules which differentiated them visually from the T7 models which had a black ignition module. The ignition module on both T5 and T7 are an integral ignition coil and electronics that plug directly onto the spark plugs without the use of spark plug wires that were typically used in most engines at the time.
SAAB Models Utilizing Trionic Engine Management System:
Sources include: Engine management system SAAB Trionic T5.51
Engine management system SAAB TRIONIC T5.5 http://www.mintoff.co.uk/T5/Engine%20management%20system%20SAAB%20TRIONIC%20T5.5,%20rev%20102.pdf ↩