Author Topic: B8.5 SQ5 - Catalytic Converters  (Read 403 times)

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Offline Esque5

  • Posts: 7
B8.5 SQ5 - Catalytic Converters
« on: October 11, 2020, 11:33:10 am »
Hi all!

First post here after being absent from the car community for 2 years :)

I recently purchased a 2016 SQ5 TFSI and I'm going over it with a fine tooth comb. At some point I'd like to go with a stage 1 tune, intake an and aftermarket exhaust.

I read that the 3.0 tfsi motors blow catalytic converters even in stock form (partly because of their location). Has the NZ Audi community come up with a way around this or are we just going to the dealerships everytime they go? I don't really feel like paying $7000 every time the cats go  :'(

Offline RayRay

  • Posts: 30
Re: B8.5 SQ5 - Catalytic Converters
« Reply #1 on: October 12, 2020, 08:36:51 pm »
Hey Esque5, nice car!

firstly, i'm no expert but it does seem to be a common issue, didn't read any definitive advice though. https://www.audizine.com/forum/showthread.php/760957-The-Official-Blown-Catalytic-Converter-Thread

Seems to be a few items that need to be looked after to extend the life of the cats:
secondary air system https://www.shopdap.com/blog/post/common-issues-with-3-0t-supercharged-tfsi-audi-engines1.html
ignition coils https://roninautowerks.com/blog/2018/2/08/when-to-replace-the-catalytic-converter-in-your-audi

Links are part sellers I know but seems like good to know info.

I'm sure some of the knowledgeable vaskers here will help with some good advice.
2000 A4 B5 1.8TQ Sport AJL man sedan NZ - driving
2006 BMW E91 325i M-Sport tip touring JPN - neglected
1991 BMW E30 325i M-Tech1 man sedan NZ - sold and cried

Offline Esque5

  • Posts: 7
Re: B8.5 SQ5 - Catalytic Converters
« Reply #2 on: October 13, 2020, 01:09:35 pm »
Hey RayRay!

Thanks for the reply, mate! I had a chat to my tuning guru and I think we have a clear roadmap forward even if the cats had to jump out the exhaust or melt due to some excessive horsepower madness :)

Knock-on-wood, the majority of failures seem to be linked to older 3.0 tfsi motors from about 2011 to 2012. Lot of added updates were done on mine (2016) which relate to thermostats and fuelling, which in turn also links to cats and their lifespan in the motor. But, I'm being cautious with this motor. I know the EA888 platform inside and out, but this 8R 3.0 tfsi is a little larger than my previous 4pot lol.

For now, plans are to go ahead with some stage 1 fun and see how it responds to the extra ponies.

Offline RayRay

  • Posts: 30
Re: B8.5 SQ5 - Catalytic Converters
« Reply #3 on: October 27, 2020, 07:09:29 pm »
For now, plans are to go ahead with some stage 1 fun and see how it responds to the extra ponies.
V6 supercharged then with stage 1 ...whoop!! >:D I can only dream ::)
2000 A4 B5 1.8TQ Sport AJL man sedan NZ - driving
2006 BMW E91 325i M-Sport tip touring JPN - neglected
1991 BMW E30 325i M-Tech1 man sedan NZ - sold and cried