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Old 08-02-2008, 11:31 PM   #1
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3.4L swap without swapping DME

Does anyone know what would happen if a Boxster 2.7 was swapped for a 986 3.4L engine and the stock boxster DME was still used?

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Old 08-02-2008, 11:44 PM   #2
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contact Scott at Softronic
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Old 08-03-2008, 12:55 AM   #3
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I think member tholyoak could work something out for you.
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Old 08-03-2008, 01:10 AM   #4
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If the 3.4 matched the 986's DME (5.2.2 with the same OR 7.2 with the same) ... then the engine would run, rough, but would run.... you would get some noticable power increase, but you would still be running 2.7 timing and etc.... you would need to get the DME flashed by a PST to the 3.4 program
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Old 08-03-2008, 08:23 AM   #5
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you said the 986 3.4L. do you mean the 996 3.4L, or the 987 3.4L? the 987 motor is a no go with your current DME.
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Old 08-03-2008, 02:55 PM   #6
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Red face

Quote:
Originally Posted by insite
you said the 986 3.4L. do you mean the 996 3.4L, or the 987 3.4L? the 987 motor is a no go with your current DME.
Oh yes, I mean the 996 3.4L. Thanks.

I've actual done it and it runs. I just don't know if I'm getting the full potential because the DME wasn't upgraded.
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Old 08-03-2008, 02:57 PM   #7
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Quote:
Originally Posted by easyc
If the 3.4 matched the 986's DME (5.2.2 with the same OR 7.2 with the same) ... then the engine would run, rough, but would run.... you would get some noticable power increase, but you would still be running 2.7 timing and etc.... you would need to get the DME flashed by a PST to the 3.4 program
Sorry, but what's PST? Do you know anyone that can do the proper flash? Looks like Softronics is one of them?! Anyone else?

Of if I have access to the DME that the 996 engine came from, will it work if I just used that DME in my Box instead?
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Old 08-03-2008, 03:03 PM   #8
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Quote:
Originally Posted by easyc
If the 3.4 matched the 986's DME (5.2.2 with the same OR 7.2 with the same) ... then the engine would run, rough, but would run.... you would get some noticable power increase, but you would still be running 2.7 timing and etc.... you would need to get the DME flashed by a PST to the 3.4 program
The car is running rough and gives 1126, 1128, 1130, and 1133 error codes. Could this be the case? I did a search on the forum for these codes and it mostly relates to MAF or vacumn leak.

Sorry for my ignorance, but what is MAF? and do you think it's actually MAF or because the DME wasn't upgraded?
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Old 08-03-2008, 04:05 PM   #9
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PST is the Porsche Scanning tool... all dealers and some Indy shops have them.... you need to run a Boxster DME and get it flashed to a 3.4 engine program. The MAF (mass air flow sensor) will need to match that of the same generation of your engine... the tech that does the re scan can tell you if you have the right one or not...

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