Cat removal?

Rage removed the cat from his Ibiza TDI and actually found his stats DECREASE... which may be worth noting...

What were/are Rage's final performance stats?.. did he break the magic 200bhp?

Maybe a sports cat would be the best replacement?
You get some back pressure, keep it legal and gain power.

Originally posted by Neo_VR
What were/are Rage's final performance stats?.. did he break the magic 200bhp?

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.....no

Well at the time Ians TDi had 150 Bhp and could keep up with Simon on the 0 - 60 sprint. I took the pictures myself to prove it. Just ask Ian. :devil:

Originally posted by FabiaTDi
Did Rage get his car RR'd after the new exhaust was fitted?

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Yes he did, results are confidential... see my earlier post

Originally posted by FabiaTDi
So not as good as the results in his sig then?

Personally I was just thinking of a decat (probably from Powerflow) rather than a whole new exhaust. This should help free up the back box a little as I have heard the cat can be restrictive.

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Just speak to Ross and get your name put down for a Milltek

Originally posted by m0rk
the point being - is back pressure a good thing or a bad thing?

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I was under the impression that some back pressure is needed. After having a de-cat exhaust and free flow back box Rage's BHP went down.

Its like a trade off, which would you rather do? De-cat it and have a faster turbo spool up time. As theres very little back pressure.
Or get a sports cat and exhaust system? so you have lowered back pressure and gain BHP.

A catalyst has as such 'elements'. On a sports cat there are more of them and there larger. This allows higher rates of air flow.
As actually proven by Simon, the power went down when he eliminated back pressure.

my race cat is 100 cell i think where as normal cats are 400-500

Sorry, I'm confused over which has more cells.
Last nights pop is finally wearing off now.

Regular cat on the left, with many small cells. Sports on the right with less, but bigger cells. Borrowed from Milltek.

Im not 100% sure if a Sports CAT would be applicable for a diesel.

Petrol CAT's are a three way convertor whereas a diesel one is two way. Their chemical make up is different.

Personally i'd just de-cat it. We do this on our PD's alot. Milltek make a large bore downpipe without a CAT and we fit that to a larger bore system with twin round tail pipes. We add a rear valance from a four motion Golf which has the cut out for the silencer so it looks smart. (for the 130 and 150 PD Golf).

Power is usually up a few bhp on a normal remap on the PD and turbo seems to spin up faster.