Running rich when battery voltage low

2012+ US/Canadian Civic Si / 2013+ ILX
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schaffertnathan
Posts: 21
Joined: Thu Jun 28, 2018 6:31 am

Running rich when battery voltage low

Post by schaffertnathan »

I already know that I need a new alternator since the battery doesn't always charge properly. But is it normal to run rich when the voltage is low? I'm on E85, so normal AFR when idling at 14.5V is 9.7-10. However, when the battery is not charging at idle, and the voltage is around 12.2V, the AFR richens up to 7.5-8. Is it normal to do this, or is there something I should adjust? One thing I can think of is Injector Opening Time. I'm on DW 550cc injectors.
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datalog0028 (normal idle).fpdl
(9.05 MiB) Downloaded 51 times
datalog0026 (rich idle).fpdl
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Rev039.fpcal
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Spunkster
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Posts: 19345
Joined: Fri Sep 20, 2002 5:06 pm
Location: Hondata

Re: Running rich when battery voltage low

Post by Spunkster »

It sounds like you have the wrong dead times for your injectors. You should start there. You will also have to re-tune the fuel tables.
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