In a previous thread I was told the easiest was to get rid of the smoke at idle after decat was...put the cats back!

1, Has anyone done this and had it cure the smoke?

2, Is there no alternative?

 

As the only silencers are right at the back, has anyone fitted any in place of the cats and if so does it/will it give enough back pressure to cure the smoke?

 

Is there anything else you can do to the exhaust to cure it?

 

A friend talked about "cones" that motor bikes have that gives back pressure, but my thoughts are it would prob be more restrictive than the cats.

 

See my cr@p pic for his idea..

 

http://rides.300zx.co.uk/rides/2445/restrictor.jpg

I have small silencers in place of the Cats and have never had any smoke on idle or anyother time.

Westy, do you have 4 then? i.e. 2 in place of the cats and 2 at the rear?

Yeh, iI have four silencers in total, mainly because i didn't want it to be to loud. I would have thought that a pair of small tightly packed silencer would be worth a try and they have got to be better than putting the cats back in.

Cheers, by the way is westy any referance to VW?

Rossy ,

 

i had the same problem with smoke on start up after de catting i put a centre box

before the propshaft centre bearing

fed both pipes into one the box then out the box to the two end boxes ...lovely "burble" sound and no more smoke , its still a straight through system so no significant loss of power , in fact it seems less peaky and more tourquey than before

 

steve