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Join Date: Dec 1999
Location: Los Angeles
Posts: 2,479
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I'd be interested, but I have an 84, which means, I had to solder my new chip in. It's in to stay. I'd have to unsolder it and put a holder in there in its place. I haven't gotten around to it yet.
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07-09-2002, 11:14 AM
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Join Date: Jul 2001
Location: laguna niguel
Posts: 304
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i found this thread very interesting this morning so i thought i'd give it a try...my car is a '86 Calif. but with a Automotion/Weltmeister chip. So far i can't tell any difference...maybe with the stock chip? Is the aftermarket chip negating any benefit of unplugging the brown wire?
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07-09-2002, 01:14 PM
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Not Quite Banned
Join Date: Dec 1999
Location: Ft. Lauderdale
Posts: 1,222
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FR is correct, however, the 911 has only 1 pin input to the DME, so I do not see how you get 4 possible configurations in a 911. (This would require 2 inputs to the DME, and that MAY be the case in a 944). It was my understanding that the different ignition maps were possibly selected by using the rotary switch that is mounted on the digital board.
In the 911 28 pin chips there are, in fact, three maps for ignition only and 1 map for fuel. For all the hackers out there, the following is the Hex address where each array begins: Ignition Part Throttle: 12A6h, 16F2h,1880h (12x12 array) Ignition Idle: 136Ch,17B0h,193Eh (10X1 array) Ignition Full Throttle: 1348h,1794h,1922h (16x1 array) Good luck-
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Thomas Owen 1972 911T 1972 911S |
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07-09-2002, 02:57 PM
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My 1985 is a Cali Carrera with a stock chip. Unfortunately, it's at the shop getting aligned. When it comes back, I'll be sure to try out this modification.
Until then, as a SW engineer I am most interested to read about the various hacking going on...
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Roger 1985 3.2 Coupe - Guards Red "Well-weathered leather, hot metal & oil..." |
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07-09-2002, 04:09 PM
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Join Date: Aug 2001
Location: Mason, OH
Posts: 2,568
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Even though I have an SC, I have been following this post with interest.
Great information and since Tony started the process it looks like he should get the Carrera Nobel prize.
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Doug '81 SC Coupe |
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07-09-2002, 05:16 PM
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Not Quite Banned
Join Date: Dec 1999
Location: Ft. Lauderdale
Posts: 1,222
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Pin 28 on my DME harness goes to the Altitude Correction unit...Is it possible that, based on altitude, a different ignition map is selected?
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Thomas Owen 1972 911T 1972 911S Last edited by Thomas Owen; 07-10-2002 at 05:15 AM.. |
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07-10-2002, 03:41 AM
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Location: DTX
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so in my california 89, running steve's chip, would the connected/disconnected status of the brown wire matter? will it give the same relative change to any chip in the dme, or does the chip have to be specifically written for it?
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89 Carrera 3.4 "There is a right way to go around a corner - it's called the line." -- PCA DE speaker bryteside.com - good things happen. |
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10-25-2005, 12:59 PM
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bump for the definitive answer??
My car had been running so bad for so long... Until I recently disconnected the bad wire.... Now it runs great??
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'85 Carrera Coupe, Marble Grey #118 JP/R6 '93 Lexus SC400, '00 Ford F-150 '70 911T- 2.7 (SOLD) |
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10-28-2005, 03:16 PM
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Correction... Bad Brown Wire...
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'85 Carrera Coupe, Marble Grey #118 JP/R6 '93 Lexus SC400, '00 Ford F-150 '70 911T- 2.7 (SOLD) |
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10-28-2005, 03:17 PM
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Reviving an old thread, bump again to learn more about this. I am showing on paperwork that my car was delivered to NY and then brought into California in the mid 90s. Does this "brown wire" have an effect on the car? I will look later on to see if its connected or not connected. I have an 84.
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Modes of Transportation: 1984 Porsche 911 Targa 2003 VW Jetta GLI Last edited by 84porsche; 12-12-2005 at 03:18 PM.. |
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12-12-2005, 01:35 PM
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Yes!
Disconnect it & see for yourself!!!
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'85 Carrera Coupe, Marble Grey #118 JP/R6 '93 Lexus SC400, '00 Ford F-150 '70 911T- 2.7 (SOLD) |
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12-12-2005, 03:02 PM
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Is this the right "brown wire" ? I can't see anything else without taking out my seats.
 
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Modes of Transportation: 1984 Porsche 911 Targa 2003 VW Jetta GLI |
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12-12-2005, 08:14 PM
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Join Date: Dec 2004
Location: Novato, CA
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I believe it is. I don't know for sure, but after reading this thread I went out and checked and mine was still connected (strange for a car originally delivered in NJ...). I disconnected it and will find out more on the drive to work tomorrow...
ianc
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BMW 135i. Nice. Fast. But no 911... "I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79 |
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12-12-2005, 10:11 PM
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Whoopsies I was banned!!!
Join Date: Sep 2005
Location: Trying to Escape from FLA
Posts: 4,596
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84 Porsche,
I believe the wire (pair) in your picture is for the altitude sensor (that silver cylindrical thing to the left of the DME in your picture)? On my '84, the California wire is a single wire (as opposed to a pair). It is located (and protruding from) the wiring harness at the DME connector. It may even be taped to the harness. For me, I can readily see and disconnect it when viewing the DME and harness underneath the drivers seat from the front of the seat. Remove your drivers side carpet. Voila!!! Hope this helps. Regards, Carlton |
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12-13-2005, 05:29 AM
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Location: Houston, Texas
Posts: 59
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Quote:
Look instead from the front of the seat. The big bundle of wires that has the plug on it, connects to the DME. You should see two brown wires, the ends of which may be taped to that harness. Unwrap the tape to reveal the ends of those wires. There is also a clip bolted to the floor that might be in the way. A 10mm nut IIRC. Remove the clip to make it easier to remove the tape. My car is an 87, not sure if the 84 is exactly the same. Mine were already unplugged (non Ca car.)
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1965 912 1987 TL Cabriolet |
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12-13-2005, 06:50 AM
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Location: Novato, CA
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Can anybody post a pic of this please?
Guess I'll have to reconnect my altitude sensor now...  ianc
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BMW 135i. Nice. Fast. But no 911... "I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79 |
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12-13-2005, 08:04 AM
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Location: Houston, Texas
Posts: 59
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Quote:
What are these wires? See the brown wire that is coming out from the connector? There are two like that. Trace them towards the driver's door. If they are covered in tape at the ends, unwrap and take a peek. Each wire ends in a plastic connector.
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1965 912 1987 TL Cabriolet |
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12-13-2005, 08:47 AM
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Quote:
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Modes of Transportation: 1984 Porsche 911 Targa 2003 VW Jetta GLI |
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12-13-2005, 09:29 AM
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It's the thin little brown wire that is all of about 3 inches away from where the wiring harness connects to the DME, and just in front of the DME Relay.
Steve Wong even chimes in about it here. 
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'85 Carrera Coupe, Marble Grey #118 JP/R6 '93 Lexus SC400, '00 Ford F-150 '70 911T- 2.7 (SOLD) |
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12-13-2005, 09:50 AM
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'85 Carrera Coupe, Marble Grey #118 JP/R6 '93 Lexus SC400, '00 Ford F-150 '70 911T- 2.7 (SOLD) |
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12-13-2005, 11:39 PM
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1985 Porsche 911 Carrera 3.2 
1984 Porsche 911 Carrera Targa 3.2 L
