Battery voltage at WOT?

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smurfbus

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	Battery voltage at WOT? « on: July 15, 2012, 12:53:37 PM »

Has anyone logged battery voltage at WOT? Mine seems to bounce between 13.6V and 12.6V? I 've been having some sort of power loss when WOT and 3rd gear 5000rpms and 4th gear 4000 rpms. From the logs I can see that at those rpms my Battery voltage drops 1V!

Just curious if thats normal.


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professor

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	Re: Battery voltage at WOT? « Reply #1 on: July 15, 2012, 12:58:22 PM »

Think its not and strange.
Mine is constant at 14V and with lights on at 13.4V.
Dont know if air vent to cool fluids are that power/amp eaters.


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nyet

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	Re: Battery voltage at WOT? « Reply #2 on: July 15, 2012, 02:37:26 PM »

Definitely not normal.... alternator issues?


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smurfbus

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	Re: Battery voltage at WOT? « Reply #3 on: July 15, 2012, 11:45:21 PM »

I changed the voltage regulator/brushes of the alternator 3 yrs ago but the rest of the alternator might be going bad?

3rd gear graph:

So voltage should stay at 14V on full WOT too. I haven't seen any logs where voltage was graphed.


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nyet

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	Re: Battery voltage at WOT? « Reply #4 on: July 16, 2012, 09:15:46 AM »

I'll try to get a log time permitting

BTW ecuxplot has an "export" function. You dont have to take a screen shot Wink


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smurfbus

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	Re: Battery voltage at WOT? « Reply #5 on: July 16, 2012, 09:55:33 AM »

I just checked and the voltage gauge shows solid 14 when the power brakes up at 3500-4000rpms.


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prj

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	Re: Battery voltage at WOT? « Reply #6 on: July 16, 2012, 01:31:05 PM »

Check the positive and negative terminal on battery, make sure they are 100% tight and that neither of the leads is getting hot.


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smurfbus

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	Re: Battery voltage at WOT? « Reply #7 on: July 16, 2012, 01:39:25 PM »

Will do but one week later as the car is going for paint boot for a week now. I know the terminals are not loose (but possibly not tight enough) as I regularly put my charger on the posts for new code flash but dunno if the battery or terminals are getting hot.


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prj

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	Re: Battery voltage at WOT? « Reply #8 on: July 16, 2012, 01:59:02 PM »

Well, it's an easy thing to check. Last time I had this problem was the positive terminal was connected badly and getting very hot. Probably moved around on WOT


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