O2 simulators, is the a company that makes them

[JMB331]

looking at making my own exhaust (down pipes and cat back) and was wondering if anybody knows of a place to get o2 simulators for the o2 sensors after the cat's. i live in michigan so i dont have to worry about having my car tested and if i make my own and dont have to have cats i can save alot of money. used them before on other cars and worked great just couldn't find any for the s4 let me know if anybody knows of any, or if you have made them your self.

[jpm757]

rai motorsports

[OB1]

This is a very easy thing to make,
http://www.vpcuk.org/forums/showthread.php?t=17754

[Jdubya]

This is a very easy thing to make,
http://www.vpcuk.org/forums/showthread.php?t=17754

Used that in my TT when I removed the cat. It worked.

[JMB331]

that is a cheaper idea never used one like that i have always used the simulator that plugs into the wiring for the o2 sensor its self and just always reads a good reading to foul the ecu. besides jdubya using it on his TT has anybody done/ try this method on the 4.2 s4 and what was your out come i like the idea of it very easy to do just want to know how well it would work for a larger engine(V8).

[Justincredible]

that is a cheaper idea never used one like that i have always used the simulator that plugs into the wiring for the o2 sensor its self and just always reads a good reading to foul the ecu. besides jdubya using it on his TT has anybody done/ try this method on the 4.2 s4 and what was your out come i like the idea of it very easy to do just want to know how well it would work for a larger engine(V8).

Making your own is easy. I know vast is close to you and they sell something that will work or get you close. IMHO if your going to go threw all that work. Just get a tune it will unlock the power from the exhaust and help get rid of the CEL.

If your having your exhaust made at PFE or diamond fab they both know how to make CEL removers

[StratGreg]

i've had good luck with these. They have a small cat substrate in there.

[JMB331]

i've had good luck with these. They have a small cat substrate in there.

stratgreg where did you get those from, and how much did they cost if you remember.

[StratGreg]

We have them here. $30 ea. Just give a call if you need one

585.742.9310

[StratJohn]

Adding in, those spark plug de-foulers, for the 4.2, tend to not fit so hot. I have had to bore out the inside in order to clear the O2 sensor body, and it ended with the thing snapping in half while threading it in. Hence we sourced the wonderful things you see in the pics above.

[Justincredible]

I agree with John. the eliminators can be a hassle In the end. just get a JHM tune. It will help with the power and the CEL.

[B6JoeS4]

+1 for getting the JHM tune. It ignores the rear o2 sensors so you don't get a cel. you will see a huge power increase. its about the same seat of pants feel when you go from stock exhaust to de-catted custom. well worth the 500.

[StratJohn]

Does the tune clear all of the readiness codes? You can have the CEL off and still fail readiness. Clarification?

Plus, what states do sniff testing?

[Justincredible]

Does the tune clear all of the readiness codes? You can have the CEL off and still fail readiness. Clarification?

Plus, what states do sniff testing?

yes other tunes won't pass the readiness test from what Ive seen The JHM tune has from what Ive seen on my and other cars. and if its a sniff test your still able to pass if you have main cats in. if your on a sniff test and no cats neither is going to help you get past that but from what Ive seen or heard you can request a JHM Emissions file and if you have no cats you may still be able to pass

[JMB331]

+1 for getting the JHM tune. It ignores the rear o2 sensors so you don't get a cel. you will see a huge power increase. its about the same seat of pants feel when you go from stock exhaust to de-catted custom. well worth the 500.

i like the sound of the tune because you kill two birds with one stone (more hp which i always want, and it bypasses the hear o2's) but what does it all change to increase the power. does it increase red line, change timing (noticeable drop in mpg) ect really not looking to spin a bearing this car is still a dd for me, and do you have to send in you ecu first or do they charge you a core and u just send your old one back once you get the new one. like stated above im looking to blow my tax refund money on the beast 346hp is just not cutting for me at all, and i need a more aggresive exhaust tone ( im coming from the small block chevy v8s so you get the idea) i know it wont sound the same but i want the same impact when driving everybody notices and gets the girls wet with a single rev haha

sorry for all the Q and A just trying to learn this car, new territory for me.

[B6JoeS4]

I don't know exactly what the tune does, but I'll try. Not sure if it adds timing. I dont think it could unless you were running a higher Octane fuel. With catless, the car is not pulling timing like it usually does. you overnight your ecu to them and then they overnight it back. its a 2-3 day process. they don't do cores on ecu's. The tune is worth every penny, and it's on sale right now. it also learns as you add new mods. if you add their IM, for example, it will adjust to the extra air flow whereas the stock tune doesn't know what to do with the increased air flow.

[beemercer]

Back to the simulators, has anyone effectively used one on an Audi? I don't want to trick the O2 sensor, I need a circuit in place that completely replaces my rear O2's. My A6 has no rear O2 sensors (they are tuned out), but the ECU needs some sort of response or it fails the readiness tests. I wonder if there would be a way to simulate the rear O2's with a circuit, all the sensor is doing is sending a voltage, wonder if it'd be possible to emulate the voltage and signal frequency using a 12v line and some resistors?

[B6JoeS4]

Don't mustang cobra guys use something like that? They use some type of resistor. I guess all you would need is the impedance from an o2 sensor reading normal levels. Good luck finding that information though lol

[StratJohn]

It is possible. I have seen in the past a DIY for making them to work for an E36 M3. I know jack diddly about electronics, but, should someone better at it be able to read the current on a functioning sensor while on a vehicle? And then.. just recreate that in a loop for the end of the O2 sensor plug? I am sure there is a little more to it, but, pretty sure thats the basics.

I think this is a step in the right direction
http://www.mkiv.com/techarticles/oxy...sor_simulator/

[JMB331]

Back to the simulators, has anyone effectively used one on an Audi? I don't want to trick the O2 sensor, I need a circuit in place that completely replaces my rear O2's. My A6 has no rear O2 sensors (they are tuned out), but the ECU needs some sort of response or it fails the readiness tests. I wonder if there would be a way to simulate the rear O2's with a circuit, all the sensor is doing is sending a voltage, wonder if it'd be possible to emulate the voltage and signal frequency using a 12v line and some resistors?

yeah you could easly make one with one simple resistors you could pick up at a radio shack, the hard part is knowing which one. you need to know what levels this ecu needs to show in order to pass the rear o2's and then use the correct resistince level to recreate it. that is what i used on my camaro but they were premade and work perfectly( looked like a little 1 inch box that just pluged in to the wiring for o2, much cleaner looking too), and i too would much rather use something like that then these options i have been shown that just reduce the amount of exhaust that reaches the o2 sensors (to me is seams a little half assed for my car)but hey if it works and doesnt ever false read then whatever. im going to see if i can get my hands on a good scan tool and see if i can figure out the correct resistence needed, and make one that way. it will test my knowledge from my electronics class i took in college 4 years ago haha