Cat bypass with resonator

[Dave80GTSi]

Originally Posted by flmont

Hmm , So for those of us who have to do emissions testing Via the plug under the dash,.and the 2002 manifolds have the 02 sensor B4 the cat, could you backdate to 1999 manifolds or header's and still pass emissions ,if you welded a bung into the Exhaust header,..?? for the 02 sensor..? Thanks frank

Take a look at my second picture in Post no. 20 of this thread.

You can see that these manifolds do not contain an O2 bung, but there is one at the front of the Circuit Werks resonators.

You need to fab up a pair of cable extensions for the FRONT O2 sensor so that it can reach the shown CW bung. A 'Search' of this forum will bring forth discussions about how to make these extensions.

Finally, you need to do a ROW tune which ignores the presence of the REAR O2 sensor since this system does not require the use of these second sensors. Thus, no dashboard warning lights.

DM

[flmont]

Ah ok..great I have the mid pipes installed and I do have those bung's..so just extend the harness and find some header's ! would the softtronics tune be the same as the ROW tune.? Thanks again,.. Frank

[Dave80GTSi]

Originally Posted by flmont

would the softtronics tune be the same as the ROW tune.

No idea, I'm not familiar with that.

Likely others here who are can chime in.

[flmont]

Thanks Dave...what did you do for your ROW tune.??

[Dave80GTSi]

Originally Posted by flmont

Thanks Dave...what did you do for your ROW tune.??

https://www.ecudoctors.com/

[flmont]

Cool...Thank You sir..!!

[edc]

Originally Posted by Dave80GTSi

Take a look at my second picture in Post no. 20 of this thread.

You can see that these manifolds do not contain an O2 bung, but there is one at the front of the Circuit Werks resonators.

You need to fab up a pair of cable extensions for the FRONT O2 sensor so that it can reach the shown CW bung. A 'Search' of this forum will bring forth discussions about how to make these extensions.

Finally, you need to do a ROW tune which ignores the presence of the REAR O2 sensor since this system does not require the use of these second sensors. Thus, no dashboard warning lights.

DM

For what it's worth the ROW tube does monitor the rear lambdas. I know because when you add sports cats you often get the cat efficiency CEL code. You can right angle space the rear lambda or have it coded out.

[pilot4fn]

Originally Posted by edc

You can right angle space the rear lambda...

What this "You can right angle space the rear lambda" means?

[ike84]

Originally Posted by edc

For what it's worth the ROW tube does monitor the rear lambdas. I know because when you add sports cats you often get the cat efficiency CEL code. You can right angle space the rear lambda or have it coded out.

This is incorrect. Sorry.

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[Dave80GTSi]

Originally Posted by ike84

This is incorrect. Sorry.

Yes, I agree. With my ROW tune, I have only one O2 sensor per engine bank, with no error codes whatsoever (as I have already repeatedly noted in this thread).

[ike84]

Originally Posted by Dave80GTSi

Yes, I agree. With my ROW tune, I have only one O2 sensor per engine bank, with no error codes whatsoever (as I have already repeatedly noted in this thread).

As does every other thread regarding this topic!

Btw, I don't know what ecudoctora chargea for their services, but it's not difficult or expensive to get your hands on a working piwis 2. The hardware is made by samtec and can be purchased through a number of websites. The software can be purchased with the hardware, or downloaded from mega. No, it's not legal, but it works and is a fantastic tool to have if you're serious about working on these cars.

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