Scirocco Central

good day people!

I've been driving my scirocco R for over a year now… really love the car. especially its DSG fart… however, I've been thinking of how to increase the loudness of the DSG fart. i've thought of doing decat to my exhaust, but what worries me is the oxygen sensor thats gonna pop up with a fault. Do you guys have any suggestions or recommendations to overcome this problem? i would prefer to stay stock tune though

If you fit a decat.the emissions light can be mapped out. It's normal practice with a stage 2 remap.

Don't know where you're based but remember a decat is illegal in the UK as the car won't pass an MOT unless you have a tester willing to turn a blind eye or you refit cat for the test.

Cuprabob wrote:If you fit a decat.the emissions light can be mapped out. It's normal practice with a stage 2 remap.

Don't know where you're based but remember a decat is illegal in the UK as the car won't pass an MOT unless you have a tester willing to turn a blind eye or you refit cat for the test.

hi cuprabob! thanks for the fast reply! I'm considering staying with stock tune and had no plans for a stage 1 or 2 at the moment. im based in a country where entitlements of cars cost as much as a ferrari (pretty well known country… i don't wish to say its name ) where decatting is illegal as well. But i believe thats the least of the trouble if the CEL is eliminated, i can actually go for a dummy-cat

smallblueboy20 wrote:

Cuprabob wrote:If you fit a decat.the emissions light can be mapped out. It's normal practice with a stage 2 remap.

Don't know where you're based but remember a decat is illegal in the UK as the car won't pass an MOT unless you have a tester willing to turn a blind eye or you refit cat for the test.

hi cuprabob! thanks for the fast reply! I'm considering staying with stock tune and had no plans for a stage 1 or 2 at the moment. im based in a country where entitlements of cars cost as much as a ferrari (pretty well known country… i don't wish to say its name ) where decatting is illegal as well. But i believe thats the least of the trouble if the CEL is eliminated, i can actually go for a dummy-cat

Hi there
We can supply you with a d76mm down pipe and cat which will not illuminate the CEL and is also road legal.
Cheers
Nige
BCS Automotive Limited
http://www.powervalve.co.uk" onclick="window.open(this.href);return false;

One of these will do it, the TT lads use them and works great :-)

http://m.ebay.co.uk/itm/170909875264

Shak

How does extending the mounting of the sensor stop it from noticing that there's no cat? Is it just because the sensor bit is removed from the gas flow? If so why not just take it out, tyrap it back and plug the hole?

chelspeed wrote:How does extending the mounting of the sensor stop it from noticing that there's no cat? Is it just because the sensor bit is removed from the gas flow? If so why not just take it out, tyrap it back and plug the hole?

It limits the amount of gasses going to the lambda sensor, you can't just remove it and plug the hole as it needs to have some readings of the gas otherwise it will still bring on the eml.

Shak

shshivji wrote:

chelspeed wrote:How does extending the mounting of the sensor stop it from noticing that there's no cat? Is it just because the sensor bit is removed from the gas flow? If so why not just take it out, tyrap it back and plug the hole?

It limits the amount of gasses going to the lambda sensor, you can't just remove it and plug the hole as it needs to have some readings of the gas otherwise it will still bring on the eml.

Shak

what are the chances of the CEL coming up should i choose to use the o2 sensor extender? will my car go into limp mode due to O2 sensor error?

smallblueboy20 wrote:

shshivji wrote:

chelspeed wrote:How does extending the mounting of the sensor stop it from noticing that there's no cat? Is it just because the sensor bit is removed from the gas flow? If so why not just take it out, tyrap it back and plug the hole?

It limits the amount of gasses going to the lambda sensor, you can't just remove it and plug the hole as it needs to have some readings of the gas otherwise it will still bring on the eml.

Shak

what are the chances of the CEL coming up should i choose to use the o2 sensor extender? will my car go into limp mode due to O2 sensor error?

No it will be fine, the post cat sensor is mainly for checking the emissions of the cat, therefore doesn't have any input to the running of the engine hence why mappers map the sensor out during remaps.

Shak

hence... if i choose to decat my exhaust, applied with an o2 extender, i would not have any CEL accompany by loss of power or sudden limp mode? will the ECU learn of the "new" reading of the emission and decided to start dumping more/less fuel to create the right reading? im abit worried with erratic behaviour

smallblueboy20 wrote:hence... if i choose to decat my exhaust, applied with an o2 extender, i would not have any CEL accompany by loss of power or sudden limp mode? will the ECU learn of the "new" reading of the emission and decided to start dumping more/less fuel to create the right reading? im abit worried with erratic behaviour

Right....it's the pre cat sensor that has an effect on running, only it can tell the ecu to either richen up or lean the system via fuel trimming. The post cat has no effect on running and it's job is to make sure the cat is efficient, if it detects the cat has low efficiency then an eml will be illuminated and that's it. The extender tricks the sensor as it only receives a limited amount of gasses..... This is why mappers map the sensor out as it has 'no effect' on running the engine :-)

Shak