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Battery Voltage at WOT

Old 02-27-2009, 12:14 AM
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Default Battery Voltage at WOT

What is battery voltage supposed to be at WOT?

Rev normal it is about 14V

Driving WOT it drops to 12.5-12.6
Is this normal?
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Old 02-27-2009, 12:24 AM
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Default Re: Battery Voltage at WOT

voltage should remain the same throughout by design of an alternator. big fat injectors hogging all the voltage? lol.

whats the car? setup? ------ed wiring?
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Old 02-27-2009, 12:36 AM
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Default Re: Battery Voltage at WOT

Car is 99Si
Stock wiring and b16a motor

alternator was rebuilt after i put new battery.

Reving the motor, and idle, it is 14V

Only on load it drops down. WOT 12.6
wtf is up
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Old 02-27-2009, 12:37 AM
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Default Re: Battery Voltage at WOT

load by electrical or load by drivetrain/car in gear?
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Old 02-27-2009, 12:50 AM
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Default Re: Battery Voltage at WOT

Load with car in gear
I am using Ectune.
Eld is disabled.

im stumped!
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Old 02-27-2009, 01:01 AM
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Default Re: Battery Voltage at WOT

The ELD will output .1 - 4.8 volts to the ECU. This reference voltage is what tells the ECU to increase or decrease the field strength in the alternator, which in turn bumps up the output of the alternator.
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Old 02-27-2009, 01:10 AM
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Default Re: Battery Voltage at WOT

it is disabled stock
should i re enable?
Do you think this is the cause?

If not, what the hell do i check

Oh when i crank over, volts recorded by ecune was 7V
thats low right

but its a brand new battery
and rebuilt alt
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Old 02-27-2009, 01:14 AM
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Default Re: Battery Voltage at WOT

rebuilt alternator rebuilt by mexicans in a sweatbench shop, could be part of the reason. the other is, if honda equipped the car with ELD why would they disable it :1

you're essentially running a 1-wire altenator in a FI car. enable that ---- youre going to ---- your tuning up with changing voltages (someone correct me on the honda logic if i'm wrong)

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Old 02-27-2009, 01:17 AM
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Default Re: Battery Voltage at WOT

Car isnt FI.................... AS YET!

Cool i will re enable it tomorrow

do you think thats causing this mess?
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Old 02-27-2009, 01:35 AM
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Default Re: Battery Voltage at WOT

question IS

why will it do it when in gear

should it not happen when i rev in Neutral ?
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