monitoring voltage
10-02-2006, 07:52 PM
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monitoring voltage What's the best PID to monitor for voltage ? I found Ignition Voltage which seems to be what I'm looking for, ~13v fluctuating.
I'm trying to see if/how much my voltage drops when my fans come on, I just added a second SPAL fan, and I have a lot of electrical crap
From logging with HPT Ignition voltage, it starts out at 13.1 and fluctuates around 13, dropping to ~12.2 when the fans kick on with the stereo blasting.
I already have a 200amp alternator on order which will probably be plenty to run the fans, but where should these values be (should it always stay at 13.1 or is ~12.2 okay) and is the Ignition Voltage PID a good way to monitor this ?
Rob (Bad30th)
I'm trying to see if/how much my voltage drops when my fans come on, I just added a second SPAL fan, and I have a lot of electrical crap
From logging with HPT Ignition voltage, it starts out at 13.1 and fluctuates around 13, dropping to ~12.2 when the fans kick on with the stereo blasting.
I already have a 200amp alternator on order which will probably be plenty to run the fans, but where should these values be (should it always stay at 13.1 or is ~12.2 okay) and is the Ignition Voltage PID a good way to monitor this ?
Rob (Bad30th)
10-02-2006, 09:11 PM
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not sure in HPT but it's called gm.volts in EFILive.
I was having a similar problem recently. Stock alternator would start out at 14.0 cold and work it's way down to 12.6 within a few miles. New 200 amp alternator fixed it right up. Voltages don't get below 13.6 now.
I was having a similar problem recently. Stock alternator would start out at 14.0 cold and work it's way down to 12.6 within a few miles. New 200 amp alternator fixed it right up. Voltages don't get below 13.6 now.
10-02-2006, 10:00 PM
#3
Courious as to why you need additional cooling and a bigger alt. If its a cooling problem a more efficient radiator is what i'd recomend, accessory drag due to a larger alternator and more drag due to high current draw with extra fans will pull hp.
Last edited by SmokingWS6; 10-02-2006 at 10:06 PM.
10-03-2006, 08:25 AM
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Originally Posted by SmokingWS6
Courious as to why you need additional cooling and a bigger alt. If its a cooling problem a more efficient radiator is what i'd recomend, accessory drag due to a larger alternator and more drag due to high current draw with extra fans will pull hp.
I already swapped to the SLP (LT1) radiator, and I'm adding a second 9" Spal fan for additional cooling, it's getting pretty common over in the FI forum. Every summer there are lots of posts about it.
I'm also not concerned about losing a few HP to the fan, if ya know what I mean (see sig).
So, does anyone know the answer to my questions ? Are the volts supposed to stay up at 13, is an intermittent drop to ~12.2 bad, and is Ignition Voltage a good HPT pid to be monitoring for this ?
Rob (Bad30th)
