Exhaust catalytic converter pressure test

Hello everyone!
I was wondering if there's a relatively simple way to check for pressure loss in the catalytic converter.
Has anyone ever performed or had performed such a test, and can they share some information about it?

My goal is to determine, without modifying the Kats system, whether it has an excessive pressure loss or not.
I'm still trying to find the cause of my slow boost build-up and power loss at high RPMs.
Does anyone perhaps have any guidelines or estimates for how large the pressure difference across the catalytic converter can be, for example, at idle or under a specific, defined operating condition?

By the way: What do you think about a CAT failure statistics database that includes information like operating hours and failure causes (e.g., fracture of the monolith, melting, carbon buildup, etc.)? The idea came to me because a colleague recently experienced a similar issue with his CAT. The unfortunate part was that he was on a longer trip and could only drive at about 120 km/h at full throttle on the way back because the pressure loss was so significant. However, it was a gasoline engine, but in my opinion, this shouldn't make much of a difference in terms of failure rate after a certain amount of mileage.

Thank you for your suggestions, ideas, and opinions.

Regards,
Alex.

Hello everyone!
I was wondering if there's a relatively simple way to check for pressure loss in the catalytic converter.
Has anyone ever performed or had performed such a test, and can they share some information about it?

My goal is to determine, without modifying the Kats system, whether it has an excessive pressure loss or not.


Hi donalexo!

Hmmm, the only thing that comes to mind is a pressure measurement between the turbocharger exhaust side and the catalytic converter...

A Prob is only the heat- and pressure-resistant connection .

I've also thought about this topic before... maybe with a thicker gasket (5mm) and a small side outlet that would be screwed between the turbo and the exhaust pipe...

But if you need to do some work, you can soon remove the catalytic converter.


But something else: What kind of problems do you have with too slow LD build-up?

I've had similar experiences before...
It was like this for me:

1. A faulty EGR valve (stuck in the open position) was sealed with a metal plate.
2. Partially defective VTG control valve (in the full LD position, it only produced 0.4-0.5 bar of vacuum instead of the 0.7 bar required by the control setpoint... -----> replaced.
3. Then I adjusted the pressure surge using the VTG strut to a value of approximately 0.1-0.2 bar.


Since then, everything has been working properly for me again...
It starts pulling at 1500 RPM, and the full torque is available at 1800-1900 RPM (in 5th gear).

Regards,
Michl.