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 Idle Bypass Air ? 
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Joined: Sat Mar 29, 2014 10:27 am
Posts: 45
How much does Idle Bypass Air affect mid-range and WOT calibrations? I'm assuming it does but without a AF ratio meter I can't tell how much. The thought came up last week while I was adding more bypass air. Thanks.

Tue May 09, 2017 2:47 pm
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Joined: Fri Feb 08, 2013 2:37 pm
Posts: 1744
The most effect is at idle and the effect diminishes as the throttle is opened. Exactly how much depends on the particular engine's intake vacuum characteristics. Whatever airflow provided by the IABP "leak" is compensated for when the idle mixture is adjusted. If the IABP is very large, perhaps .140" ~ .150" +, it may be more necessary to compensate in the range of the T-slot with a smaller IAB or larger IDCR or larger IJ, follow your nose like you have been.

You need to look into one of these. ... l_plus.php


Tue May 09, 2017 3:32 pm
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