Pre Cat removal

[the bruce]

BTW, the coming Mk.VII GTI will have only ONE cat, which is close to the turbo.

Thats exactly what it is like on the 1.4TSI.  The cat is within a few inches of the turbo.

Right, the 1.4 TSI already had only one cat and this is also a metallic one with 400 or so cpi.

Ok, so besides 'the bruce' I only read positive experiences with the precat removed.

Ask a Volkswagen engineer and he'd probably say the same.

Guess the removed precat will be a good and noticeable mod for me?!

Nothing noticeable.

Cost cutting measure then?

Guess not. It's a metallic cat on the 1.4 TSI (I don't know any details of the coming GTI in this),
it's got an advanced noble metal coating and even more the tubing between turbo and cat is
double-walled for improved isolation and to retain the heat on the way to the cat - important
after a cold start and mking the pre cat obsolete.

I bet this even increases cost.  

[Timvgti]

What's the deal with a Simons sport resonator?

Some guys choose to remove the resonator (search youtube 'remove resonator golf 5 gti) for extra sound.
I didn't like the sound because I heard that you can get a vibration at cruising speeds and the sound is to loud with a cold start/stationair.
So I decided to replace the stock middle resonator with a sports model from the brand Simons.
The sound is amazing. Not to loud. No drone/vibration and a very nice sound when changing gears (dsg).
Pic:


Also replaced the two stock exhaust tips for two 80mm models:


I guess that together with the removal of the precat, this is the best price technically option with verrrrrrrry good results. (Total costs are around 260 euros over here in The Netherlands with labour included at a skilled mechanic/tuning company)

[B Gurupprasad]

Hi All,

I own a Skoda Octavia vRS Nov 2005 Model in India. Bought second hand, i was going all fine till the Floods played spoil sport.

Post flood, when i connected the VCDS, i did see 1 error code with respect to O2 sensor:

"16514/P0130/000304 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit

Possible Causes
Oxygen (Lambda) Sensor Heating Bank 1 Sensor 1 faulty
Possible Solutions
Check Oxygen (Lambda) Sensor Heating Bank 1 Sensor 1"

My mechanic suggested to remove the "Catalytic Converter" and check for blockage. And yes, the culprit was the Cat-Con. it was blacked out with carbon, disrupting the free flow of exhaust.

I was suggested to drive with Cat-Con removed and it turned out good as the car was breathing easily.

The Next Morning, i got to see the "EPC & Check Engine" lights glow. Given below are the error codes.

"17524/P1116/004374 - Oxygen (Lambda) Sensor Heating Bank 1 Sensor 1: Open Circuit

Possible Symptoms
Malfunction Indicator Light (MIL) ON
Possible Causes
Fuse(s) faulty
Wiring and/or Connector(s) from/to Oxygen (Lambda) Sensor (G39) / Oxygen (Lambda) Sensor Heating (Z19) faulty
Oxygen (Lambda) Sensor (G39) / Oxygen (Lambda) Sensor Heating (Z19) faulty
Possible Solutions
Check Fuse(s)
Check Wiring and/or Connector(s) from/to Oxygen (Lambda) Sensor (G39) / Oxygen (Lambda) Sensor Heating (Z19)
Check/Replace Oxygen (Lambda) Sensor (G39) / Oxygen (Lambda) Sensor Heating (Z19)"

and

"17511/P1103/004355 - Oxygen (Lambda) Sensor Heating; B1 S1: Performance too Low
Possible Solutions
Check Oxygen Sensor Heating for Oxygen Sensor before Catalytic Converter"

please help me understand if it is due to removal of Cat-Con? do i have to do some adaptive coding using VCDS to let the ECU know that i have removed the Cat-Con?

thanks in advance

Guru