BNA_ELLIS

Does anyone know what symptoms are on an fd when the main cat has gone or is going. I know one sympyom is no second turbo, is there any other. i.e balck smoke, strange noise, lack of power etc ???

regards

Brian

Mahjik

iTrader: (1)

I haven't experience it personally, but I've read about people having some of the following symtoms:

* Lower than normal boost (both primary and secondary)
* Some idle problems

If the cat is getting clogged, it should effect both primary and secondary boost. If you are only seeing a problem with your secondary boost then I doubt it's the result of a clogged cat.

DamonB

My main cat died a few weeks ago. The only symptom I had was that all of a sudden I went from 11-9-11 to 9-5-7; no matter what I couldn't get more than 7psi. I was on the track at the time and in a span of about 10 minutes the boost kept falling until it stayed at 7psi max.

I pulled the cat and dumped handfulls of brick and wire mesh out of it. Installed another stock cat and the car was perfect again.

No smoke, coughing, sputtering or anything, just less boost.

Imagine a clogged cat like a clog in a drain. As long as there is not too much water coming through there are no problems, but once more tries to pass than the clog can let by, things back up. Since there is less exhaust volume in the primary turbo (less engine rpm) its boost is not affected as much as the secondary turbo (high engine rpm). My results support this as my primary was only 2 psi low with a clogged cat but my secondary was 4 psi low.

cruiser

Hmm... anyone knows if its possible to weld on some other's car (i.e. from BMW or similar) main cat when RX7's cat goes ? (hard to get some used cats in Europe and shipping from USA -> Europe would be A LOT considering the weight of the cat )

I'm also thinking of installing an universal hi-flow cat. Any experiences with that ? (they go around $200 new)

DamonB

cruiser, the conventional wisdom I have always heard is that the "generic" cats won't last on our cars because our exhaust is much hotter and burns out the wadding that holds the brick in place.

BNA_ELLIS

Interesting thanks for reply guy's

Rgds
Brian