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On the rich side compared to what? I haven't seen any normal injection cars with high compression running leaner than 14.7 at idle. Direct injection is a whole different animal.
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04-17-2014, 08:10 AM
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A True Z Fanatic
 
Join Date: Nov 2011
Location: Houston
Posts: 12,265
Drives: 2011 370ztt
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On the rich side compared to what? I haven't seen any normal injection cars with high compression running leaner than 14.7 at idle. Direct injection is a whole different animal. 11.5 or so at WOT fits with the way I understand the way you want to tune a NA car- dial in AFR for peak power, then add a touch of fuel back in to allow for temperature swings, fuel variations, etc. Also, fuel works to cool down the intake charge to some extent. You can also run a little closer to the edge with 93 vs 91 octane, so it also depends where you are.
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