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Old 10-04-2012, 07:25 PM   #1
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Join Date: Jul 2011
Location: Brooklyn
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Differences in 996 and 986 ABS/PSM system

As part of my engine + electronics transplant project, I will be putting the version 7.8 DME, 5.7 ABS, and wheel speed sensor modules from a PSM equipped 2002 996 into a non-psm 2000 986 S. Will PSM just "work", taking its inputs from wheel speed sensors and suspension angle sensor (part of the 986 Litronics option)? Are there other sensors that I will need from the 996? Also, does it matter to PSM that it's going into a mid-engined car? Do I need to get a proper 986 PSM/ABS brain for that to work right?

Thanks for any input you have
"Betty" -- 2000 Boxster S, Triple Black, loaded except PSM (sold to a good home)
"Veronica" -- 2008 Boxster S, Arctic Silver on Blue
"Maleficent" -- 2007 Cayman S, Red and Black, TPC Turbo 3.6L 460 RWHP, H&R RSS Coilover / TPC stage 2 suspension
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Old 10-05-2012, 10:17 AM   #2
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Location: Glen Allen, ON
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If the cars only have ABS, the ABS control units are the same 996 to boxster. With PSM the control units are different. In addition to the control unit for ABS/PSM you need the wiring, the rate of turn/transverse accel sensor, the booster pump, the steering angle sensor and the PSM off switch and reprogram the instrument cluster. As you have stated, any upgrade to 5.7ABS needs the new wheel sensors which themselves have different connectors. Also if your 2000 has no traction control/PSM it is a 3 channel system and will need a new rear brake line and distribution block to convert it to a 4 channel system. Not something I would undertake frankly. If you can't drive a car without PSM then you should probably not be increasing its displacement

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