OBDII and no cat (cut it out you search bashers/tree huggers) also looking for O2 sensor specs?
Thread Starter
Senior Member
Joined: Jun 2004
Posts: 10,399
Likes: 3
From: Chicagoland, IL
OBDII and no cat (cut it out you search bashers/tree huggers) also looking for O2 sensor specs?
Hey guys,
So a number of you are running with no cat.. and some of those have O2 simulators...
My tuner said he hasn't seen a code thrown on a car with a removed cat and a turbo. Seems like that contradicts with SOME of the data on this forum...
So, who's running OBDII with no cat and no codes? Anyone? (Mine is a 98 ITR, stock ECU).
Thanks!
On the same topic-- If I DO throw a code I am very strongly considering building my own "Simulator". With the O2 sensor where the cat should be, a capacitor should precisely simulate the effect of the cat buffering the o2/fuel balancing act that the cat does. Maybe an RC circuit. I saw some haXors using 1K resistors in series with the O2 sensor, which I was surprised to see worked for some people.
I'll post a how-to as soon as I find the impedance of the O2 sensor and computer (or as soon as I just start guessing and measuring the output). I have some friends working for Motorola's automotive division (racing and OEM ECU's for Chrysler??) since I work for MOT's cell phone division. I'll figure out the specs. Should be a couple of 5-cent parts and a soldering iron.
So a number of you are running with no cat.. and some of those have O2 simulators...
My tuner said he hasn't seen a code thrown on a car with a removed cat and a turbo. Seems like that contradicts with SOME of the data on this forum...
So, who's running OBDII with no cat and no codes? Anyone? (Mine is a 98 ITR, stock ECU).
Thanks!
On the same topic-- If I DO throw a code I am very strongly considering building my own "Simulator". With the O2 sensor where the cat should be, a capacitor should precisely simulate the effect of the cat buffering the o2/fuel balancing act that the cat does. Maybe an RC circuit. I saw some haXors using 1K resistors in series with the O2 sensor, which I was surprised to see worked for some people.
I'll post a how-to as soon as I find the impedance of the O2 sensor and computer (or as soon as I just start guessing and measuring the output). I have some friends working for Motorola's automotive division (racing and OEM ECU's for Chrysler??) since I work for MOT's cell phone division. I'll figure out the specs. Should be a couple of 5-cent parts and a soldering iron.
Thread Starter
Senior Member
Joined: Jun 2004
Posts: 10,399
Likes: 3
From: Chicagoland, IL
Re: OBDII and no cat (cut it out you search bashers/tree huggers) also looking for O2 sensor specs?
I found the RC circuit I was looking to build. Wish I had the specifications for the o2 sensor so I could calibrate it exactly like I want it, but hell it's working so why mess with success.
Basically it's a 1 microfarad cap and a 1 megaohm resistor. About 5 cents and it should act a whole heck of a lot like a catalytic convertor.
http://home.insightbb.com/~nie...g.gif
From here (thanks niedejb)
https://honda-tech.com/zerothread?id=137216
If I trip a code, I'm building it.
--Chris
Basically it's a 1 microfarad cap and a 1 megaohm resistor. About 5 cents and it should act a whole heck of a lot like a catalytic convertor.
http://home.insightbb.com/~nie...g.gif
From here (thanks niedejb)
https://honda-tech.com/zerothread?id=137216
If I trip a code, I'm building it.
--Chris
Joined: Nov 2003
Posts: 229
Likes: 0
From: haiku, hawaii, us
Re: OBDII and no cat (cut it out you search bashers/tree huggers) also looking for O2 sensor specs?
Just hang the 2nd o2 sensor on your shift linkage. The reason for your secondary o2 sensor on obd2 cars is to make sure that the cat is working. By hanging the sensor out of the exhaust stream the first sensor reads the a/f ratio, and the second sensor will read only oxygen therefore tricking the ECU to think the cat is there and working. Hope this helps.
Member
Joined: Feb 2002
Posts: 1,250
Likes: 0
From: Bay Area, CA
Re: OBDII and no cat (cut it out you search bashers/tree huggers) also looking for O2 sensor specs?
No code here, knock on wood. OBD2 GSR, I wrapped the secondary sucker in foil and stuck it up the hole where it belonged. I've been on this setup for over a year and it's been cool.
Try open downpipe
Try open downpipe
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