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This ECU is said to be modified by Autothority many years ago. Apart from the sticker on the cover, what is the giveaway that the circuit board has been modified? Thanks for your insight
I don't think that ECU has been modified at all. That is a 1996 ECU, and the original chips are on it, and those chips cannot be flashed.
That ECU needs a "piggy-back board" to be soldiered into it in order to modify it.
I don't think that ECU has been modified at all. That is a 1996 ECU, and the original chips are on it, and those chips cannot be flashed.
That ECU needs a "piggy-back board" to be soldiered into it in order to modify it.
That's correct, no mods. If that's the DME ECM from the OP's 993, he's lucky. The video linked to indicates some confusion on the part of narrator, i.e. confusion about what's a memory chip or a processor chip with memory.
__________________
Loren
Systems Consulting - Automotive Electronics
Specializing in Porsche cars http://www.systemsc.com/
@CosmosMoon@systemsc
I’m baffled. My car had a Greddy boost controller, Autothority MAF, 5bar fpr together with this “modified” DME/ECU when I bought it last year.
I’ve taken all that off and installed a stock maf, stock fpr and stock DME/ECU (flashable one thinking the one I had was modified).
I guess to be 100% certain I can swop them and see how the car drives? Maybe I now have a stock backup DME/ECU
Loren back in the day when these chips were available, couldn’t autothority have just replaced the chips? (Visited them and had them install their ecu/maf on one of my other cars in the early 2000’s).
And I always thought the 96 was single chip vs 2 for the later?
Loren back in the day when these chips were available, couldn’t autothority have just replaced the chips? (Visited them and had them install their ecu/maf on one of my other cars in the early 2000’s).
And I always thought the 96 was single chip vs 2 for the later?
Actually, the "chips" of the '96 and later ECMs were proprietary to Bosch and not sold commercially. Furthermore, they were complex not only with just memory but included a processor capability.
It was beyond what Autothority did with replaceable EPROMs, e.g. '95 and earlier ECMs.
So the OP’s ecu is stock and the only reasonable explanation is that someone may have ‘took’ the now programmable (more value to most) ecu and replaced with old ecu, transferring the cover or sticker to this ecu?
Or I suppose stock ecu with the listed mods might run ok and the 5bar fpr would mask most problems. I know tuners also used na 993 ecu’s with external boost controllers.
So the OP’s ecu is stock and the only reasonable explanation is that someone may have ‘took’ the now programmable (more value to most) ecu and replaced with old ecu, transferring the cover or sticker to this ecu?
Or I suppose stock ecu with the listed mods might run ok and the 5bar fpr would mask most problems. I know tuners also used na 993 ecu’s with external boost controllers.
I believe the cover and circuit board with dual chips belong together. And that the 1995-1996 993 Turbo came with this DME/ECU. Bosch part number that ends with 758. Someone (previous owner) must have pulled out the Autothority chip from the ECU then. Would that involve desoldering?
Prior to taking the engine back to stock it didn't really run very well. Very rough on idle and in general difficult to drive. Didn't feel like the AFR was correct. It ran quite well under full throttle though. Maybe because the DME/ECU didn't match the setup?
I believe the cover and circuit board with dual chips belong together. And that the 1995-1996 993 Turbo came with this DME/ECU. Bosch part number that ends with 758. Someone (previous owner) must have pulled out the Autothority chip from the ECU then. Would that involve desoldering?
Prior to taking the engine back to stock it didn't really run very well. Very rough on idle and in general difficult to drive. Didn't feel like the AFR was correct. It ran quite well under full throttle though. Maybe because the DME/ECU didn't match the setup?
Really doubt there was an AutoThority chip ever installed. The two right 68 pin chips in the '96 were replaced with a single chip (processor with flash memory) in the '97/'98 ECM.
05-07-2024, 02:04 AM
Modified ECU?
