Air Pump Delete effect on Maryland Emissions test?
05-15-2010, 07:29 AM
#31
Drifting
Wow, spend the day traveling and come back to this thread to read about a bunch of whiney law breakers. Aren't we all?
My comment about why remove the air pump is in relation to the idea Porsche obviously designed the engine and attendant metering with the air pump in place. I'm not concerned at all about the pollution aspect, though I believe cars today are much better performing because of them, but why one removes any component of any system that was obviously engineered into the car seems strange unless you are seriously modifying the car.
My comment about why remove the air pump is in relation to the idea Porsche obviously designed the engine and attendant metering with the air pump in place. I'm not concerned at all about the pollution aspect, though I believe cars today are much better performing because of them, but why one removes any component of any system that was obviously engineered into the car seems strange unless you are seriously modifying the car.
05-15-2010, 07:40 AM
#32
Rennlist Member
Skewing a bit off-topic, but its not too expensive to replace the cats if you feel you need to do it.
For my 84, I bought an Eastern Catalytic replacement for the original downpipe / air-cat arrangement. I think it only cost about $300 or $350 in stainless.
The piece was for 85+ 928 cars. It also fit perfectly on the 84 using the standard 84 cast iron headers, though we needed to use a standard NAPA kit for connection of the little air pipe.
(air injection became obsolete as better cats and engine management emerged, but the rule is the car needs original set-up)
Along with the unit came a registration card. Basically, it was for the mechanic to certify that the reason the system was being installed was due to inoperability of the factory original, and that this was a replacement.
Remember, the states have various regulations in terms of their level of inspection, but the Federal EPA statutes also technically govern.
For my 84, I bought an Eastern Catalytic replacement for the original downpipe / air-cat arrangement. I think it only cost about $300 or $350 in stainless.
The piece was for 85+ 928 cars. It also fit perfectly on the 84 using the standard 84 cast iron headers, though we needed to use a standard NAPA kit for connection of the little air pipe.
(air injection became obsolete as better cats and engine management emerged, but the rule is the car needs original set-up)
Along with the unit came a registration card. Basically, it was for the mechanic to certify that the reason the system was being installed was due to inoperability of the factory original, and that this was a replacement.
Remember, the states have various regulations in terms of their level of inspection, but the Federal EPA statutes also technically govern.
Last edited by Landseer; 05-15-2010 at 08:41 AM.
05-15-2010, 08:34 AM
#33
Instructor
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My ROW S4 has a temperature sensor on the CATs. Without the air pump connected, they were running very hot, you could feel it in the cockpit and the CAT TEMP HIGH message would show up frequently.
I rebuilt/reconnected the pump and everything is normal now.
Also, I wonder if removing the pump may cause uneven belt pull on the crankshaft and lead to premature bearing wear. Just a thought...
I would leave it there if it works fine.
Michel
89 S4 ROW
I rebuilt/reconnected the pump and everything is normal now.
Also, I wonder if removing the pump may cause uneven belt pull on the crankshaft and lead to premature bearing wear. Just a thought...
I would leave it there if it works fine.
Michel
89 S4 ROW
