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Marc
Dodge Dakota
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5/26/2003
23:09:18
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 Subject: O2 Simulator
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Message:
Hey fellas, I'm looking at cutting out my cat and am in need of an O2 Sim or KatBox for the rear O2 sensor. If anyone has any info on where to get these or how to fool the O2 sensor without one (ie: restricot/zener diode) it would be much apprecciated.
-Marc
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Bfunk
Dodge Dakota
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5/27/2003
13:50:37
| RE: O2 Simulator
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Message:
I made one for my dak. Its really easy to make all you need is a 650k ohm@1/4w resistor and a 0.1mf capacitor. You should be able to find this stuff at radioshack. On the second O2 there are four wires two white and 1 blue and 1 black. Splice the resistor in line with the blue wire. Then connect one end of the cap to blue wire and the other end to the black wire. Its that easy.
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Marc
Dodge Dakota
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5/27/2003
16:13:56
| RE: O2 Simulator
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Message:
Bfunk, thanks for the info. I wasn't sure what kind of power circuit the O2's ran on. On the capacitor is there any difference between the two ends (like on a Zener Diode)?
-Marc
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J and J Auto
Dodge Dakota
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5/27/2003
22:57:29
| RE: O2 Simulator
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Message:
KRC has them
http://www.krcperformance.com/newcontent/home.html
I also beleave that the fastman sells them
http://www.thefastman.com/
Larry
J&J Auto
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bfunk
Dodge Dakota
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6/02/2003
01:18:19
| RE: O2 Simulator
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Message:
No, the wire ends are the same on the cap.
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tarheelSLT
Dodge Dakota
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6/02/2003
09:33:41
|  RE: O2 Simulator
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Message:
Hey fellas i hope you all live in states without smog inspection. removing or otherwise disengaging a catalytic converter can bring some heavy fines. been there done that, don't need the hat.
that aside i now live where it depends on what county you live in as to whether you need smog inspections. Most people around here run straight exhaust.
J and J Auto what is the advantage of removing the cat and adjusting the 02?
Also could someone enlighten me as to what an IAT does and why i read posts on where the best place is to relocate it?
slowly building a SLT.
20MPG 20OO DakSLT, stage II 9" intake.
dynomax next then possibly v8TB
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J and J Auto
Dodge Dakota
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6/02/2003
14:42:49
| RE: O2 Simulator
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Message:
The IAT (incoming air temp) the sensor reads the air temp
entering your engine. being in the manifold it will get heat soaked
and tell the computer its getting hotter air and retard the timing
and cut back the fuel.
By relocating it will read colder air advance the timing a couple of
degrees and add more fuel.
I run 2 IAT's the one in the manifold and the other is located in
the plastic piece from the old intake system by the grill. What
I did was wire it to a switch in the cab so I can switch between
them depending on outside air temp. under 50 I use the manifold
on hot days or stop and go city I use the grill mounted one.
You can relocate the IAT just about anywhere it will read colder
air. the bottom of the air cleaner or in the incoming air tube
is a good place but you need to make the wires longer but
solder them don't use connectors.
The reason most people remove the
extra cat is to lower the restriction in the exh and because for
some reason they seam to fail more often.
Larry
J&J Auto
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tarheelSLT
Dodge Dakota
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6/03/2003
10:12:22
| RE: O2 Simulator
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Message:
okay thanks,
can you explain exactly where this iat sensor maybe located on a 2kDAK_SLT 3.9 engine?
i just purchased this vehicle w/20K mi and i have been monotoring the gas mileage and as of last friday i was getting 20mpg with no mods.
Saturday i installed the stage ii 9" big mouth air intake, we will see what happens, however, i was reading many of the posts and thought a dynomax stainless would be a good second mod and then i heard all this chatter about cats and o2 sensors coming up with codes etc. and i didn't want to get into that kind of fix. i'm not up-to-date with these new engines, i'm from the 60's non-smog muscle car era, you know the 390 AMX, Dart-HEMI, Cuda_HEMI, six packs and all that.
appreciate all your help.
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toxic13
Dodge Dakota
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6/04/2003
07:35:59
| RE: O2 Simulator
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Message:
Tarheel,
Yeah I live in MI, no smog checks here.
As for the exhaust, don't worry about check engine lights or problems with your O2 sensor with that Dynomax. As long as you only replace exhaust componants behind the cat (or second O2 sensor) you'll have no problems with any of that.
Good Luck,
-Marc M
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tarheelSLT
Dodge Dakota
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6/04/2003
09:58:22
| RE: O2 Simulator
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Message:
thanks for the reply toxic13,
but it was also interesting what J and J said regarding how you could manipulate the fuel/air by re-positioning the IAT.
that could add some MPG if done right not to mention some HP.
appreciate the help.
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bdholsin
Dodge Dakota
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6/04/2003
13:24:33
| RE: O2 Simulator
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Message:
Hey Bfunk,
What type of capacitor should I grab (disc or electrolytic?
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bdholsin
Dodge Dakota
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6/04/2003
13:33:13
| RE: O2 Simulator
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Message:
I also want to double check to make sure your resistor specification is typed correctly...are you sure that it is a 650k ohm resistor or is it a 650 ohm?
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bfunk
Dodge Dakota
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6/10/2003
11:31:33
| RE: O2 Simulator
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Message:
Yes its a 650k resistor and as for the cap its should be about the size of a .22 cal shell casing with wires coming out both ends. Its not a disc.
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bdholsin
Dodge Dakota
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6/10/2003
11:39:37
| RE: O2 Simulator
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Message:
Thanks. I think I can muddle something like this together.
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bdholsin
Dodge Dakota
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6/10/2003
12:33:05
| RE: O2 Simulator
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Message:
Ok, maybe I can't muddle this together or if I can I'll make it about 100 times more complicated then it needs to be. I checked online at Radioshack and they don't carry a 650k ohm resistor. However, they do carry 100k and 50k ohm 5% carborn film 1/4 watt resistors. My guess is that I can put a small circuit board together and connect six 100k and one 50k ohm resistors in series. If I recall from my EE classes in college this will give me the equivalent resistance of one 650k resistor. I can tack the capacitor on the end of the circuit to complete the modification. If I encase all this stuff in a small box and encase it in epoxy it should work (in theory)....right?
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bdholsin
Dodge Dakota
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6/30/2003
15:24:41
| RE: O2 Simulator
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Message:
Can anyone answer this...To avoid having to install the O2 sensor back in the exhaust pipe could I just cut off the O2 sensor body and splice the capacitor and resistor in parallel (with the capacitor first) between the blue and black wires, thus eliminating the O2 sensor body completely? I would then connect the white wires (heater circuit) together to form a loop. I would post the picture that I have but I can't upload a file.
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bruizer
Dodge Dakota
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9/18/2003
22:18:39
| RE: O2 Simulator
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Message:
hey BDHOLSIN,
did you try doing that yet? did it work? i kind of agree with you however if the sensor is actually cut out would you really even need the capacitor because there will no longer be a fluctuacting voltage as it heats up. as long as the resistor drops the voltage to about 400 millivolts the computer would think everythings fine. thats what i interpret anyway .let me know what you think.
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bdholsin
Dodge Dakota
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9/22/2003
13:12:54
| RE: O2 Simulator
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Message:
I got a little worried about this and ended up buying the simulator from thefastman.com . I had a shop mechanic tell me that I deserve what I get if I end up frying my PCM by doing the "home fix". Everything seems to be working fine right now. No issues so far. I didn't want to go through the aggrivation of having to replace the PCM as Dodge is pretty expensive to have this done.
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