Catalytic converter clogging

mhrallyteam · Post by **mhrallyteam** » Fri Dec 31, 2004 1:55 am

Here`s the problem, When i drive the first 10min, the boost goes to 9-10psi easily(everything stock, cold weather) and everything is fine. Then after a couple of miles, the boost has more difficulty to go any higher than 6-7psi at WOT.

I have only one cat, its in the downpipe, i wonder if it could be the cause, cat getting hot and jamming the airflow at the downpipe. I'm a tree hugger so i want a cat in there, but is anybody having similar problem, happy new year!

vrg3 · Post by **vrg3** » Fri Dec 31, 2004 2:36 am

Are you using stock boost control?

There are times when the ECU decides to limit boost to wastegate pressure, which is about 6 psi. It seems to be correlated with either a failure of the boost control system to work correctly, or with detonation.

-K- · Post by **-K-** » Fri Dec 31, 2004 5:26 am

I would try a MBC out and see what the boost does with that.
I had a hard time going above factory boost befor I took the cat out but didn't notice a difference when it was hot or cold.

I can find WRX used DP's for $50 all the time. It will take some work to fit it right but it's way cheaper than a new Legacy DP from Subaru.

mhrallyteam · Post by **mhrallyteam** » Fri Dec 31, 2004 9:09 am

I already use a WRX downpipe, that why i would be surprise to have a bad cat, it`s not too old.

I'm going to install my mbc soon, and a wrx I/C if i can find the time.

Why would the engine detonate when hot only, it would do so at all temp range. It pull so hard for the first 10min, weird...

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Catalytic converter clogging

Catalytic converter clogging