Like the saying goes; "There's a sucker born everyday.", and you find them
buying junk off of Ebay. Have to love it!

If you must buy a chip (many problems), buy from someone you can find
and have some recourse with when your engine gets damaged.

 

One should be sure that any offered chip for a '95 USA car should properly start & run a .163, .674, and .675 ECU.




Where would one find these numbers?? run and start??? sorry for the ignorance.



PS: They saying is; "There is a sucker born every minute".

 

Steve R., .163, 674 and .675 are ECU numbers. ECU is under the driver's seat, you can see the number if you move it to the frontmost position andshine the flashlight in there.
What Steve W. means that any chip sold in US should be able to make the car start and run if it's installed in any of teh ECUs that end in these three numbers.
Steve W. will correct me if I'm wrong.

 

Every minute - I guess some Rennlist members are worse than others.

The standard DME used in the '94/'95 is a 55 pin unit with a Bosch
number of 0 261 203 675, PN 993 618 124.03. The chip used should
be a 28 pin 256K EPROM.

Check out the web site (www.systemsc.com) on the Parts page for
more part numbers of Porsche DMEs.

Interesting Note:

The DME unit pictured in the background on Ebay is NOT a 993 DME, since
a 993 DME is a single board DME. The one shown is probably a 964 DME.
Like I said, "You have to love it."

 

My 1995 C2 cab built in 1994 has a 163 DME as pictured below:

 

Lauren, what is your affiliation??

Check out the web site (www.systemsc.com) on the Parts page for
more part numbers of Porsche DMEs.

 

That DME pictured is the typical 993 single board DME using the 256K EPROM,
which I refer to as Motronic IV. Bosch uses a different number sequencing.
The unit you have is an earlier one than I indicated, but the 203 number is
the key. It generally indicates the circuit board type. The last three digits
indicate the EPROM used.

If the chip on Ebay is really for the early 993 and it's "good", it should work.
Personally, as you can tell from previous posts, I wouldn't buy it.

The web site mentioned is my company's.

 

Personally, I can't see spending $40K plus on a car and trying to save a couple of hundred dollars on a part that has the potential of causing significant problems that could result in a repair bill of several thousand dollars.

Isn't it being penny wise and pound foolish?

 

Loren, the reason I put that picture there is to indicate that there are ECUs besides 675 (and I think 674 is more common than 675, but I might be mistaken).
I also think that EPROMs are not interchangeable between these ECUs. Can you comment on that? Steve W?

 

"Personally, I can't see spending $40K plus on a car and trying to save a couple of hundred dollars on a part that has the potential of causing significant problems that could result in a repair bill of several thousand dollars.

Isn't it being penny wise and pound foolish?"

He's right on!

Nile13;

You didn't understand my post. The DME shown on Ebay is a two board DME
as used for the 964. The early 993 used a single circuit board DME with the
three center digits of 203. You can interchange EPROMs as long as they are
for the same series DMEs as indicated by the center three digits and the engine
is basically the same, e.g. not VarioRam. Porsche/Bosch also during production
of a car, e.g. early 993, updates the DME EPROM for improved drivability, etc,
e.g. 3.2 & 964. This is usually indicated by the last three digits. Obviously you
can't change EPROMs between functionally different DMEs and 911 types.

To be on the safe side, you need to determine which DMEs a given EPROM
is for. Again, even if you ask you'll never really know for sure especially
when buying off of Ebay because they probably really don't know.

 

Loren, I understood your post very well (after all, I have 12 years of electrical engineering experience behind me, and I've burned enought EPROMs in my life). I asked a very simple question - do you feel that 163, 674 and 675 EPROMs are interchangeable? To put it even simpler - if one buys a 674 EPROM would it operate correctly in a 163 DME?
That is a yes or no question. Do you have an answer? Thank you in advance.

 

The answer is yes. To verify my statement, you can open the box and you should
find the following:

1. a single circuit board
2. mostly all surface mount devices
3. a large uP chip
4. a 20 pin A/D converter chip and a 28 pin memory chip
5. 4 I/O chips
6. 2 22 pin MOSFET heat sunk driver chips
7. 28 pin socket for the EPROM

 

Thank you Loren.
I know what's inside the box. I wanted to know if the three named EPROMs are interchangeable. I've read some info to the contrary. Boris, I believe that you have similar info?

 

Nile 13 ..do you have one of these chip installed on car?

 

No, I do not.