Test Pipes and fooling the computer?
02-28-2007, 11:33 AM
#1
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Test Pipes and fooling the computer?
So I have been searching for a way to fool the computer on my 1.8 96 miata. Basically I need to replace the cat, but I don't have the money and figure I will be buying a whole new exhaust for the new motor thats in the works. That being said, if I pull the cat I should get a check engine light. So is there a gismo out there for the miata that will get rid of the secondary 02 sensor? In the BMW world there are 02 sensor simulators that just fool the car, but I don't know about the miata world.
They don't test emissions in Florida because its just a bullshit tax and means nothing but a way to tax you for being poor and having an old car. So I don't really care at this point. My 1970 cutlass polutes a hell of a lot more, so I figure if I drive the miata I am saving the atmosphere a little every day.
So how do I install a test pipe and not get a check engine light?
They don't test emissions in Florida because its just a bullshit tax and means nothing but a way to tax you for being poor and having an old car. So I don't really care at this point. My 1970 cutlass polutes a hell of a lot more, so I figure if I drive the miata I am saving the atmosphere a little every day.
So how do I install a test pipe and not get a check engine light?
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02-28-2007, 11:38 AM
#3
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I drilled out a spark plug fouler and screwed that into the not so good cat of my Sister's 1996 GS-R and screwed the 02 into that. No check engine lights. I have seen the s2k crowd do the same with no issues.
Might want to do a google search for those links.
Jason
Might want to do a google search for those links.
Jason
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02-28-2007, 11:42 AM
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The ecu compares the voltage produced by the first and second sensors. The second sensor is supposed to output less voltage. I don't know if it's a percentage less, or a fixed amount less, but there has to be area for fudge factor because the cat degrades over time. You could probably parallel the output of the first sensor to the second sensor input, diode isolate it and add a very small amount of resistance in the form of a multi turn potentiometer. Tweak the pot to increase/decrease the voltage drop until the ecu is happy.
I've never attempted such a thing, but it would probably work, and it's not difficult.
I've never attempted such a thing, but it would probably work, and it's not difficult.
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02-28-2007, 11:50 AM
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The hardest part will be getting the pot set correctly. If you get it to work, measure the resistance that was needed. We can then build an o2 replacement kit to sell to the m.netters. Let's see, a diode, some resitors, 6" of wire, and some crimp connectors. How does $149.99 sound? Too cheap? :gay:
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03-08-2007, 09:23 PM
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Well, this is very informative. I guess I should just buy a new engine management computer and chuck the stock ecu. But until I have lots of money, I guess I will try that other way around. Now what the hell is an exhaust fouler thing?
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03-08-2007, 09:40 PM
#13
http://forums.clubrsx.com/showthread...91#post6186391
Follow this link, it describes the process of using defoulers and includes pictures of what a defouler is. Defoulers are available at nearly all chain autoparts stores such as advanced, autozone, o'reilly.
Follow this link, it describes the process of using defoulers and includes pictures of what a defouler is. Defoulers are available at nearly all chain autoparts stores such as advanced, autozone, o'reilly.
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