2nd Generation Specific 1986-1992 Discussion

S5 Air pump

Old 11-12-2006, 08:11 PM
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OK the deal is my precat and main cat are removed so do I need the air pump any more? I was told if I removed that i will have problems!
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Old 11-12-2006, 10:02 PM
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you dont need it on a catless turbo config...
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Old 11-12-2006, 10:35 PM
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actually, well if your car is a s4 NA or either yr T2, you dont need it,



however if you have an s5 NA 89-91, then the aux ports and VDI are ran off the air pump so removing it would render them non funtional, which you would lose a good deal of top end.
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Old 11-13-2006, 08:00 AM
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Thanks for the help as soon as I get in my block off plates that thing is gone.
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Old 11-16-2006, 02:14 PM
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Remember you also need a dual alternator pulley once you get rid of it and need to run 2 of the crank-alternator-waterpump belts. If you don't do this your alternator has a good chance of slipping/getting damaged.
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Old 11-18-2006, 04:13 AM
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Assuming you have a T2, you shouldn't experience any problems. You definitely want to run a two-groove pulley on the alternator, but the reason is to ensure sufficient belt friction on your water pump pulley.



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