Air pump???
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Air pump???
What is this air pump for on these engines. (I have a 88 N/A) I looked under the hood yesterday and I saw this airpump and it said do not remove on it (I'm guessing just for emmision reasons). Also, I keep reading about 5 and 6-port stuff with back pressure from the exhaust, what is this all about?
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The air pump supplies air to the catalytic converters and exhaust manifold to help with emissions. This air allows unburned fuel to be burned in the manifold supplies cooling air to the cats to help both cool them and provide oxygen for the reaction that converts the nasty stuff to CO2.
The aux ports are a whole other discussion. Best to check the factory service manual for a good diagram of the induction system. This is also covered in the Haynes.
The aux ports are a whole other discussion. Best to check the factory service manual for a good diagram of the induction system. This is also covered in the Haynes.
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Originally Posted by Aaron Cake
...backpressure or velocity...
Maybe the stock S4 had enough backpressure, but I don't think that's the case here.
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#8
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So if I were to straight pipe the exhaust then this 5/6 port stuff wouldn't work right I suppose? What if I just left a muffler and the rest straight pipe? Also, if I removed the air pump that wouldn't effect anything other than emmissions right? I'm lucky..... we don't have emmisions down here!!!
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It's doubtfull that a muffler alone would open the aux ports.
If you remove the air pump, you also need to block off the ACV, remove the cats and get a duel alternator belt pully.
If you remove the air pump, you also need to block off the ACV, remove the cats and get a duel alternator belt pully.
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