All Things Mk5 > Performance Modifications
Pre Cat removal
Bogwoppit:
I removed my precat at the weekend on my (BWA) engine) Octavia vRS TFSI running the original map. The EPC light came on today, oh joy!!
Anybody else had this problem? I am getting the fault code read tomorrow.
If the fault code is caused by the precat removal can a remap remove this problem?
It could just be a coincidence but I doubt it.
Bogwoppit:
I have now been running without a pre-cat for 2 weeks (on the standard map) and the car runs fine without any engine lights. The EPC light I mentioned above was for something else and was totally unrelated to the pre-cat removal.
It's difficult for me to say if I have noticed any difference in performance due to the pre-cat as I fitted a Neuspeed intake, SFS Intercooler hoses and a rev d diverter valve at the same time as removing the pre-cat.
The car definitely feels perkier and sounds better after carrying out those mods though :evilgrin:
JMP:
Bringing up this old thread.. :innocent: What tools did you use in clearing out the cat and did you have any issues in doing this? Did you replace the exhaust seal to turbo?
And has anyone else done this, any more experiences with the power gains and how the exhaust note changes? Im thinking about doing the same for my BWA golf as I want to keep the stock appearance.
vRS_Pagey:
Since this original thread I am aware of a few members on Briskoda removing the pre-cat on their vRS's, mine will be coming out when the car is next serviced. I have a couple of spare exhaust/turbo seals but tbh as they are metal they probably won't need replacing (they're only a few quid anyway), to remove the cat material you only need a hammer and chisel, the DP will need to be off the car to make sure you remove all the material, if you plan on doing it yourself this may help in the removal of the DP -
http://briskoda.net/forums/topic/124442-tfsi-downpipe-fitting-guide/page__p__1561519__fromsearch__1&#entry1561519
I was going to complete the job myself, but I figured for the minimal cost to pay my mechanic and the likely hood the bolts being seized I would prefer that he had the headache! :grin:
Regarding power gains, I think reports show that the turbo spools significantly quicker which should convert to a few extra torques, apparently the exhaust note will deepen under accelaration but beyond that no real difference.
HTH, Lee.
JMP:
Thanks for the info! I also found the other thread on this forum that had pictures of the smashed cat. Im going to be doing this myself and there are quite good DIYs available for this, heres one done on Golf:
http://www.golfmkv.net/blog/archives/20#
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