No SAI vs cats

[Robert986]

The man with all the questions, and no answers.. Sorry ;-)

The SAI-thing..

According to the old legend ROW cars has no SAI (Secondary Air Injection, air injected to the exhaust manifolds at cold startup)

My car is a German-sold 986s 2003, it has one set of cats (rear over axle) and SAI as a standard, even though I think that as a German car it should be the same as ROW..

Anyway, let´s say that I would remove the SAI, would that destroy the cats? I have encountered that statement, however how could that be if most ROW-car have cats but no SAI.. This doesn´t add up..

Anyone have a theory?

[ike84]

Originally Posted by Robert986

The man with all the questions, and no answers.. Sorry ;-)



The SAI-thing..



According to the old legend ROW cars has no SAI (Secondary Air Injection, air injected to the exhaust manifolds at cold startup)



My car is a German-sold 986s 2003, it has one set of cats (rear over axle) and SAI as a standard, even though I think that as a German car it should be the same as ROW..



Anyway, let´s say that I would remove the SAI, would that destroy the cats? I have encountered that statement, however how could that be if most ROW-car have cats but no SAI.. This doesn´t add up..



Anyone have a theory?

I too was under the impression that ROW cars came without the SAI system, this is not correct though! Markus (smallblock454) was super helpful and hooked me up with a copy of the German PET diagram and it indeed shows the SAI system in place. That raises the question of why there are factory block plates for an SAI delete... The mystery continues....

I'm not sure why an sai delete would fry the cats though. That really doesn't make sense to me - the system is designed to bring the cats up to functioning temperature faster, thereby improving they're performance on cold starts. It only functions on cold starts though for this reason.

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[Quadcammer]

eh, continually dumping a ton of unburned fuel into the cats is not great, but really the sai only runs for like 90 seconds anyway. Considering how cheap used boxster exhausts are, I would not spend any time worrying about the oem cats.

[Robert986]

Originally Posted by Quadcammer

eh, continually dumping a ton of unburned fuel into the cats is not great, but really the sai only runs for like 90 seconds anyway. Considering how cheap used boxster exhausts are, I would not spend any time worrying about the oem cats.

That is a valid point!