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Carbon Emitter
Join Date: Feb 2004
Location: Socialist Republic of California
Posts: 2,129
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Installed Wong chip...amazing! What's the "California" brown wire do?
I've been considering the Wong chip since I bought my '89 Carerra coupe almost a year ago, but I'm very sceptical by nature. I pulled the trigger recently figuring I could just return the chip. I just installed the chip, and all I can say is WOW what a difference!!! My car had flat spots throughout acceleration which I thought were due to a worn air-flow sensor or O2 sensor (my car has 140K+ miles), but the Wong chip cured it of that, the difference is simply amazing.
One thing I didn't know about is the external brown wire that is tied to the main DME harness bundle. Wong's instructions say this was only for California models (which mine is) and to disconnect it, which I did. He says its for emissions controls and it may cause knocking if left connected. What does this wire do to control emissions? Was this the true source of my flat spots or the DME chip itself? I ordered a bypass pipe and will be installing that, a new 02 sensor, and a Monty muffler soon. For now I'm running Wong's "bypass and/or sport muffler" tuned chip with my stock exhaust until it arrives, is that OK temporarily? Thrilled with the chip...thanks Steve! Last edited by jkarolyi; 06-08-2005 at 11:32 AM.. |
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06-08-2005, 09:55 AM
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Registered
Join Date: May 2004
Location: Encinitas (San Diego CA)
Posts: 4,495
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I think you'd be fine to run this way. The O2 sensor manages air / fuel mixture, except at WOT. To be safest don't run under WOT.
Can't comment on the emissions plug, don't know the system well enough. Doug
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1971 RSR - interpretation |
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06-08-2005, 10:25 AM
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Registered
Join Date: May 2003
Location: Manhattan Beach, CA
Posts: 2,350
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By disconnecting the brown wire which goes to pin 10 of the DME ECM, you advanced
the ignition timing which will make the car feel more responsive. This jumper was used to retard the timing for the lower octane fuels found in Japan & USA. Most/all 3.2 Porsche owners have disconnected this jumper for improved performance, without excessive ignition advance, given the use of 91 octane. It's one of those no-cost performance mods. Most like you, who have disconnected this wire, have commented how their car feels totally improved.
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Have Fun Loren Systems Consulting Automotive Electronics '88 911 3.2 '04 GSXR1000 '01 Ducati 996 '03 BMW BCR - Gone Last edited by Lorenfb; 06-08-2005 at 11:27 AM.. |
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06-08-2005, 11:12 AM
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Banned
Join Date: Mar 2005
Location: Travelers Rest, South Carolina
Posts: 8,795
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Re: Installed Wong chip...amazing! What's the "California" brown wire do?
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06-08-2005, 11:37 AM
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Carbon Emitter
Join Date: Feb 2004
Location: Socialist Republic of California
Posts: 2,129
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It's not hard to find, pull back your driver's side carpet, and it will be staring you right in the face under your seat. It's a lone brown wire with a white connector zip-tied to the DME wire harness.
I will have to swap the chip back and forth after I finish installing my exhaust and see what a difference it makes. |
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06-08-2005, 12:09 PM
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Banned
Join Date: Mar 2005
Location: Travelers Rest, South Carolina
Posts: 8,795
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 Actually, after I posted the question I remembered that my car is not a CA car originally. So now I need to check it to see if the PO hooked it up or not. The car passed CA emissions easily, so it'll be interesting to find out. There's a photo on a thread from about 16 months ago that shows the wire, easy to find.My pre-muffler will go on in the next week or so. Since I'll be relocating to a non-smog check state, it'll be a permanent installation.  
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06-09-2005, 08:34 AM
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