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Pre Cat Removal


Ruskie
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I've got no pre-cats and got through the first mot this week.

Fast Idle test.

RPM = 2770 (allowed 2500 -> 3000)

CO% = 0.004 (allowed up to 0.3)

HC ppm = 0 (allowed up to 200)

Lambda = 1.001 (allowed 0.97 -> 1.03)

Natural Idle test.

RPM = 658 (allowed 450 -> 1500)

CO% = 0.005 (allowed up to 0.5)

Apparently a 'test drive' to warm the remaining cat was required though :)

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Tony (Like me, Gus, Duncan, Dave, Bazza etc) has a supercharger, and therefore the pre-cat removal is reccomended to avoid them breaking up and blocking the manifold.

For a N/A car, I suspect removal will only offer negligable gains....

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I had my pre cats removed a couple of weeks before fitting my S/C.

Driving it round for those 2 weeks i noticed that the engine rev'd more freely which gave a sense of more power. It also made the zorst note sound deeper.

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