VVTI second cat advice needed .........HELP

[Matt _Aero top_]

Hi folks

I'm in the market for a second cat and have been offered one in good condition off a VVTI .

Now I understand for it to fit my non VVTI I'll need to blank the oxygen sensor port off but I've been told VVTI cat doesn't have the honeycomb on the inside , surely this would render it from being a catalyst .

Can anyone clear this up and help me out in if this would be ok on my car for the emissions test as I have a first decat so totally reliant on the second for MOT day

 

Thanks

Matt

[BOB B]

Hi Matt, Ive got a VVTI Tip and Iv'e just checked my second cat (which is off) and there is no oxygen sensor port on it, and yes they do appear to have a straight through pipe at the position of the normal honeycomb area on pre VVTI, I'm assuming that around this area there is some honeycomb but you can't see it.

I put my 1st cat back in so I now go through the MOT with no problems, and this does not seem to effect the BPU power.

[Scooter]

Defo a different setup on the vvti innards, I think they are cheaper brand new and possibly another facelift tweak for reducing costs/recognising they were over engineered in the first place (ie two honeycomb cats was overkill). So I suspect it 'may' be not quite so good a catalyst as a prefacelift, but then perhaps the design is better, or perhaps vvti made emissions better at the tested rpms and so it didn't need as good a 2nd cat? Difficult to say if this is going to be your only cat added whether it then would breeze an mot?

[TuneR]

I ran my VVTi through our NCT (Irish MOT) with only the second cat and it failed on emissions. Passes no bother with first as said above, my second cat is in the shed now too.