Ignition Control Module
Ignition Control Module
I'm looking to purchase to ignition control modules for 90 Q45. Can anyone help me?
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Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Re: (911/Q45)
The squarish finned metal assembly that mounts on each valve cover that contains the 4 transistors [etc] each of which switches the individual coils on/off?
Whereas the injectors get switched directly from ecu [inside transistors] the coils drawn more current and need bigger transistors with an external heat sink. The coils draw current for longer time than injectors as the spark is created when the coil primary is shut off.........plus it keeps the reverse spike out of ecu and away from ecu wiring harness.
More modern designs integrate the function back in ecu [more heat there]or build in on individual coils [more heat exposure]..........not sure I like either solution but transistors have improved in 15 years [maybe].
Lots of cars have coil pack problems [Maxima] but usually not Q at least the 90-95.
Whereas the injectors get switched directly from ecu [inside transistors] the coils drawn more current and need bigger transistors with an external heat sink. The coils draw current for longer time than injectors as the spark is created when the coil primary is shut off.........plus it keeps the reverse spike out of ecu and away from ecu wiring harness.
More modern designs integrate the function back in ecu [more heat there]or build in on individual coils [more heat exposure]..........not sure I like either solution but transistors have improved in 15 years [maybe].
Lots of cars have coil pack problems [Maxima] but usually not Q at least the 90-95.
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Richard Petersen
- Posts: 43
- Joined: Mon Dec 27, 2004 10:53 am