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Discussion Starter #1
I may be way off here, but I believe the O2 sensor provides a voltage reading to the ECU in the range of 0 to 1 volt. Is it Lean to Rich or Rich to Lean for the voltage readings? Thanks.

I am purchasing my 5 wire Wide Band O2, and I want to make sure I get the right one.
 

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You are aware that a wideband operates on a 0-5v scale and rquires a controller box to make it work right? It will simulate the 0-1v that the ECU is looking for. Anyway to answer your question 0v is dead lean and 1v is ful rich.
 

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Discussion Starter #3
Take a look at this site, Wes.

http://www.lambdaboy.com/product.html

That is what I am ordering. I decided if I want to get the MAF conversion to work properly and be able to gradually up my boost, I wanted something like this. I don't want to have to mess around scheduling dyno time whenever I want to make a change.
 

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Yeah it looks as if you need the expensiva addition if you want to replace your stock o2 sensor with the wideband. Another option would be to have a bung welded into your exhaust to install the wideband into. Then the ECU would still recieve a reading from the stock o2 like normal but you would be tuning and datalogging with the wideband readout. Also I dont think the stock sensor unscrews from the 2 bolt mounting plate if you have a toyota sensor. So you will need to find a mounting plate to put the wideband in the original location. I have an aftermarket bosch sensor that can be unscrewed from the mounting plate.
 

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Suprasport sells a tapped mounting plate for the two bolt hole O2 sensor. I believe it will work on the MKII, it does on the MKIII.
 

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Discussion Starter #7
My O2 sensor mounts into my Spearco turbo exhaust manifold. I will leave it for now, but eventually will probably switch over to the wide band O2 sensor for the ECU, I am very cautious. The Wide Band will be going into the Turbo Elbow. There is already a threaded hole with a bolt blocking it off there. Thanks for your help. I should be ordering it next week. I will definitely keep you guys posted.
 
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