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turbo ride turbo ride is offline
Join Date: Sep 2012
Posts: 365
Air pump - affect AFR readings?

Hey guys-
So my WUR (964T 3.3) is off to BL to get rebuilt and made adjustable. I'm going to increase my boost - no more than 1 bar fwiw. While the WUR is away I'm installing a boost gauge and AFR meter.

Here's my question: Does anybody know how much the air pump affects the AFR readings (since it pumps raw air into the exhaust)? It may not be much but I'm thinking the AFR meter must read leaner than what the combustion chamber is actually seeing?

'91 911 Turbo
'00 Audi S4 highly mod'd DD
Denver, CO
Old 01-25-2013, 12:22 PM
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