911 3.2 Carrera ECU Swap
02-25-2004, 11:25 PM
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911 3.2 Carrera ECU Swap
Anyone have experience swapping ECUs or know of a cross reference list for the 3.2l ECUs and model years? The ECU in my '85 cabrio was stolen (with the seats) and I need a replacement. I saw a new 911 euro ECU on eBay for about $1000, but I'm not sure if the international versions or newer model years are cross compatible.
According to PET, there are different part numbers for 1986 and 1987, but that might just be some chip tuning as the components look identical. I think the chip tuning resulted in the 87-88s slight HP increase (204 vs. 217). Any reason I couldn't find an 87-89 and get the HP increase? Thanks for the help.
According to PET, there are different part numbers for 1986 and 1987, but that might just be some chip tuning as the components look identical. I think the chip tuning resulted in the 87-88s slight HP increase (204 vs. 217). Any reason I couldn't find an 87-89 and get the HP increase? Thanks for the help.
02-27-2004, 01:10 PM
#3
Starting in '87 Porsche provided the 082 suffix type DME unit.
This DME used a 32K EPROM which improved both the fuel
and ignition maps which added about 10 ft lbs of torque.
The later 082 ('88/89) used a 64K EPROM with increased
map points without much torque increase.
All the DME units ('84 thru '89) can be interchanged. The only
problem occurs with US/Japan and Euro cars, as the Euro cars lack
the O2 sensor (early ones) and generally have higher compression.
Also, using a Euro DME in a U.S. car may result in some pinging in
U.S. cars with 91 octane and a higher NOx level.
Check out this web site (www.systemsc.com) on the Parts
page for info on the various Porsche DME/Motronic part numbers.
Have Fun
Loren
'88 3.2
This DME used a 32K EPROM which improved both the fuel
and ignition maps which added about 10 ft lbs of torque.
The later 082 ('88/89) used a 64K EPROM with increased
map points without much torque increase.
All the DME units ('84 thru '89) can be interchanged. The only
problem occurs with US/Japan and Euro cars, as the Euro cars lack
the O2 sensor (early ones) and generally have higher compression.
Also, using a Euro DME in a U.S. car may result in some pinging in
U.S. cars with 91 octane and a higher NOx level.
Check out this web site (www.systemsc.com) on the Parts
page for info on the various Porsche DME/Motronic part numbers.
Have Fun
Loren
'88 3.2
02-27-2004, 11:03 PM
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Thanks for the weath of info Loren. It sounds like I might actually benefit from a later model ECU, but I think I'll steer clear of the Euro model ECUs due to the pinging (and I think it might cause me a problem smogging it here in CA as well. I might just call systemsc and find out about the cost of a remanufactured unit as well.
Either way, I'm just looking forward to getting my ride going again.
Either way, I'm just looking forward to getting my ride going again.
02-28-2004, 05:28 PM
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I'll add to what Loren said. The base idle speed changed in 1987 from 800rpm to 880rpm. If you put an '87-89 DME in your '85 you may find it idles funny (hunts). Simply reset the base idle for 880rpm and you'll be fine.
-Chris
-Chris
Last edited by Chris Bennet; 04-30-2004 at 11:44 AM.
