No KAT? What happens then?

Hallo alle zusammen, ich hab mal ne frage bzg. Diesel catalytic converter!

If I were to remove the catalytic converter, would it improve performance, or would it reduce it because there would be less backpressure?

With gasoline engines, it's just the way it is that they lose about 7-10 horsepower.

I read the report about the thermostat earlier. I've never seen my Galaxy's temperature go above 80°C. I'll try replacing it. Maybe that will fix my fuel consumption, and the car won't need 10 liters per [unit of distance] anymore.

By the way, I just did a '10-cent tuning' on my car, and I think I might have messed something up. The performance is great; it pulls strongly from 1800 to 4000 RPM. Unfortunately, I think my half-shaft might be failing because it's pulling wildly from left to right and back again when I accelerate.

Okay, and now a greeting to Germany...

Best regards, Mike.

What possible use could a backflow preventer have?

I once drove without the catalytic converter and didn't notice any increase in performance, but it was really loud. Also, the approval certificate (ABE) for your car would no longer be valid, which means you wouldn't have insurance coverage, etc.
If your system is running at full capacity, your cat should be functioning normally, and therefore not constipated.

I think that my thermostat also gradually started to close less effectively. Last winter, I sometimes had water temperatures of 65°C. It was better in the winters before, because otherwise I would have had it fixed, as I still had a used car warranty at that time .

Hello,

It's missing in mine - it's not significantly louder, and the VSD is still there. You can hear the turbo whistling a bit more.

I can't really say that it makes much of a difference.

I'll post here by January at the latest to let you know if this is enough for the TÜV (German technical inspection).

You mainly need a defined exhaust back pressure (also known as back pressure) in gasoline engines.
To ensure that as much of the exhaust gases as possible are expelled from the cylinder, there is an overlap in the opening of the intake and exhaust valves (the intake valve opens before the exhaust valve closes). The entire system, from the air filter to the exhaust tip, is designed so that the exhaust valve closes just before the fresh air charge rushes out. Of course, this is a compromise and is optimized through variable valve timing, etc. However, if you change the exhaust system, you disrupt the entire system. This can certainly lead to increased power in a certain operating range, but it degrades the overall system. Therefore, it's possible that you might have more power on the highway and go 10 km/h faster, but you'll be overtaken by every little Fiat on country roads (because the torque in the mid-range is lost). Typically, fuel consumption increases.
Regularly, complete exhaust systems (tuning systems) are tested on a dynamometer. With the exception of the absolute top-of-the-line systems, ALL of them result in a reduction in power!

In a diesel engine, this is less critical. It only draws in clean air, so a significant increase in fuel consumption is not expected. In a naturally aspirated diesel engine, the amount of fresh air entering the cylinder may be slightly reduced, but this is not the case in a turbocharged engine. In the latter, the turbocharger would simply need to work a bit harder, but this should not be noticeable in any way.
If the catalytic converter and muffler are in good condition, removing them won't make a difference. And if it did make a difference, then the component is almost certainly not compliant with regulations -> investigate the cause.

By the way, removing the catalytic converter leads to the loss of the operating license because the classification regarding harmful emissions is no longer valid, which can result in tax evasion.
The TÜV (German technical inspection agency) usually checks for...

Sure, here is the translation of the text from German to English:

'Cu Gremlin'

Before anyone else asks why I'm driving around without a cat carrier, even though I have a cat, and it doesn't make a difference.

I was driving towards France with a trailer attached, and as I was going up the Brenner Pass, the engine started performing worse and worse. Before leaving, I hadn't paid attention to the rattling noise it was making when idling, simply because I was unaware of the problem.

I managed to reach the next parking lot at just about 20 km/h, having just exited the Brenner Pass.

After 5 hours of work using tools collected from truck drivers, I managed to remove the catalytic converter and the twisted ceramic material inside. I then hastily but temporarily reassembled everything so that the car would be drivable. I had to cut off the exhaust clamp because it was impossible to detach it using the available tools.


It's hardly worth mentioning that I couldn't find a workshop in France that would weld the exhaust pipe for me. The only option was to install a new catalytic converter, which would have cost around 1800 DM. So, I drove home with the loose and leaky exhaust system, covering almost 3000 km. This experience further fueled my frustration with workshops.
(However, I didn't visit any Audi dealerships, as there were none nearby.)

The catalytic converter I have is from eBay, and I simply haven't installed it.

What did Audi say regarding goodwill gestures for vehicles with over 100,000 kilometers? Forget about it.