8 replies to this topic

[Arfreedom]

I read some where that If you remove the cat from the down pipe it will trigger a error code. Then I also read that there are 2 ways to fix the code;
1)have the tuner man go in the ecu and delete it
2) install a resistor to trick the system that the cat is still there.
My question what is this resistor?
Where can I get it from?
And where does it install?


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[duncanm]

What sort of TT setup do you have - single O2 sensor in the headers, or 2-sensor -- one header, one post-merge ?

 

I think the resistor trick is more about removing the O2 sensor than the cat...

[Jimbo]

The cat in the primary down pipe doesn't have any sensors relative to it.

My Gen2 GTB had a factory EGT sensor in the primary down pipe. When I had a custom exhaust made up, they refitted the sensor and I had no worries with CEL or cat overheat lamps.

Rather than just being ghetto and gutting the cat (good luck anyway with those angles) the primary dump can be removed from the rest of the exhaust independently . May as well have something made up, easy job for a zorst fabricator.

 

[Allan Smith]

What sort of TT setup do you have - single O2 sensor in the headers, or 2-sensor -- one header, one post-merge ?

 

I think the resistor trick is more about removing the O2 sensor than the cat...

i have the gen 3 model and it has 1 sensor on the header and then the o2 sensor on the straigt pipping. 

[Allan Smith]

The cat in the primary down pipe doesn't have any sensors relative to it.

My Gen2 GTB had a factory EGT sensor in the primary down pipe. When I had a custom exhaust made up, they refitted the sensor and I had no worries with CEL or cat overheat lamps.

Rather than just being ghetto and gutting the cat (good luck anyway with those angles) the primary dump can be removed from the rest of the exhaust independently . May as well have something made up, easy job for a zorst fabricator.

 

wasnt thinking of gutting out the cat, plans is to remove the cat altogether and modified the primary pipping with a wider hole exhaust to allow a free flow 

[Beckers]

My Gen2 GTB had a factory EGT sensor in the primary down pipe. When I had a custom exhaust made up, they refitted the sensor and I had no worries with CEL or cat overheat lamps.

 

Now I have your dumps Jimbo and that EGT sensor is rusted into that pipe like a bitch.

My gen3 gtb (rev B )  conversion has only the O2 sensor in the LH exhaust manifold.

[Jimbo]

From the tiny picture, I think the OP's is a D-E so he should have the one in the headers then one post mid-cat.

It's a shame the car wasn't very well looked after I sold it. Those dumps were really well made.

 

[Arfreedom]

So we back at square one.
What resistor is use to trick the ecu that the cat is still there?


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[Jimbo]

Did you even read anything that was posted?

There is NO sensor on a TT to tell the ECU the primary cat is still there. You can remove it, no worries.