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Title: Battery voltage at WOT? Post by: smurfbus 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. Title: Re: Battery voltage at WOT? Post by: professor 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. Title: Re: Battery voltage at WOT? Post by: nyet on July 15, 2012, 02:37:26 PM Definitely not normal.... alternator issues?
Title: Re: Battery voltage at WOT? Post by: smurfbus 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: (https://lh3.googleusercontent.com/-Z2j0gRnepVc/T_qbIU87jRI/AAAAAAAAB24/zDXLlNYUjJg/s912/batteryWOT.jpg) So voltage should stay at 14V on full WOT too. I haven't seen any logs where voltage was graphed. Title: Re: Battery voltage at WOT? Post by: nyet 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 ;) Title: Re: Battery voltage at WOT? Post by: smurfbus 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.
Title: Re: Battery voltage at WOT? Post by: prj 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.
Title: Re: Battery voltage at WOT? Post by: smurfbus 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.
Title: Re: Battery voltage at WOT? Post by: prj 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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