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1.5TDCi Catalysor Removal?

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I'm new here, with a brandnew Transit Connect 1.5TDCi LWB Van - of which I want to remove the catalytic convertor by means of "gutting": taking the actual catalytic converter out of the metal housing it sits in.

I know how to do this but need to know how many Lambda sensors this car has, 1 (pre-converter only) or 2 (pre- & post converter).

Anybody knows, can help me?

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All I can say is . . . . . thank goodness 99.9% of people buying new cars don't think like you do  -  Where would the world be if everyone was trying to defeat the emission controls on their new vehicles?


Don't know for a fact, but I would imagine there are both pre and post sensors and your new TC probably won't run worth a darn without it's catalyst



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Just in case, perhaps I should explain why I want to do this.

A catalytic converter in an exhaust system is a lifetime-resistance for an engine (aka airpump) to flow gas through - it costs energy hence power hence fuel to do this, plus it increases the pressure post-turbo somewhat.

Removing it has various advantages: more power, earlier and quicker spooling up of the turbo, less fuel consumption and in general a happier engine.

I also am aware of the drawbacks of doing this but am not interested in them, them being: more pollutants, more noise, and voiding of warranty. The two former aspects are marginal in any case, but the latter is the reason I'll 'gut' the pipe (leaving it looking exactly the same!) rather than installing a catless section because this will be visible to servicing staff.

Any cat of an engine which has only 1 lambda sensor (pre-cat) can be removed without any technical consequences, the system will keep working as is/was.

However, with dual lambda's (pre- and -post cat) one needs to pay special attention to the post-cat lambda, one needs to do stuff letting the ECU think the cat is still present ..... hence my question above.

As said, if anyone knows pls tell me.

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Thanks Don - regarding emissions you may have a point however it depends where one lives.

You're wrong about 'not running without cat' as it definitely will, actually better than it does now - for obvious reasons, the turbo works on a pressure differential which, by removing the cat, becomes bigger.

My hunch is that your hunch is wrong, I think this engine has a single lambda - but want to make sure, and I guess someone here will know, hence me asking here.

Edited by Bartford
correcting speling mistak ;-)

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I am not sure where you Are , suspect the EU.  If your TC is is a 2015-17 You are Euro 6 emissions and it is way more involved than just the Cat. The CPU compares the two O2 sensors .  It also uses a liquid-reductant agent is injected through a catalyst into the exhaust of a diesel vehicle .  I think that what you are about to attempt will not improve things and the repair cost will be formidable

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Edited by BSUPC

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CAT has been removed (gutted, the pipe simply has been emptied), and there's no lambda sensors close to it - I presume the single one sits pre-turbo, no post-CAT one present (so the engine cannot detect the presence of the CAT!).

The turbo spins up between 100 - 150 rpm sooner hence the powerband kicks in sooner, more evident than I expected actually.

Too soon to determine a difference in fuel economy but the second half of the tank is creeping to 'less' whilst driving same style on same roads to work.


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