R.e. Catalytic Convertor 8v model (2nd Hand / New)

[theombudsman]

Hi,

Was wondering if anyone knew how much a 2nd hand / new cat conv would be for my 91 Jplate 8valver.... someone bright spark spec'd it with the option of convertor... thanks

Cheers,

Adam Ombudsman

[Veedubgt18v]

i wouldnt bother even if its specced with one you dont have to have it by law because your car was registered before 1992, get a pipe in its place.

i would have thought they were a few hundred quid tho

[theombudsman]

Hi,

To try and get rid of the agricultural sound on me old faithful have replaced the back box with a stock (ernst) one, replaced the middle box, (again an ernst one)..  so all that is left is the straight pipe, then the cat going onto the downpipe. It still sounds far too much like a Massey Ferguson than a smooth purr..!

Have been given lots of varying advice.. lot of people have said to just replace it, as the cat will only knock off about 2% of power. (TSR site mentions this).  VAG quoted £275... sod that.... Was wondering how much 2nd hand one might be picked up for.

Also ... totally agree with you .. I would rather not have the Fu<£in thing there at all.

Thing is, I am concerned about how the car will run with just a straight pipe between middle box and downpipe. There is the other issue of the lambda sensor. I gather that whatever I do this sensor will still need to be reading the exhaust gases so that the ZX81 computery thing can regulate the fuel mix... is that right?

If its cheaper to get a custom straight pipe and have a sensor screw lug welded on then I would happily go for that....

Ah if.... only this car was as simple as my old mk1.... anyways mk2's though... love em!

Cheers,

Omby.

[Veedubgt18v]

could always get the front silencer that all 8v's that dont have a cat have on them, and get a lug welded on the downpipe somewhere for your lambda sensor, that is personally what i would do

[Judderi]

Yes you will need to keep the lamda sensor.

Get a straight pipe made with a bolt welded on for the lamda.

[theombudsman]

Hi All,

Thanks for the advice....

Finally job done!!! Went to "Performance Engineering"  (01934 822262) on the Locking Rd outside WSM. They made me a custom stainless steel pipe to fit from the downpipe to the middle box, refitted the lambda probe. These guys are fantastic. Did a really good job, friendly service and good price. Would recommend highly.

The cat has gone... mild lift in performance I think, not much though as it turned out the cat chamber was completely empty. ?? Must have been long gone and disintegrated.

In time will work my way back through the system and replace with full stainless steel set up.

Cheers,

Adam

P.S. Rear suspension next.....mmmh!