Running rich when battery voltage low

2012+ US/Canadian Civic Si / 2013+ ILX
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Running rich when battery voltage low

Post by schaffertnathan » Tue Feb 19, 2019 9:06 am

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.
datalog0028 (normal idle).fpdl
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datalog0026 (rich idle).fpdl
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Re: Running rich when battery voltage low

Post by Spunkster » Tue Feb 19, 2019 10:58 am

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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