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Tracking / Autocross / HPDE / Drifting What these cars were built for! |
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06-13-2022, 09:24 PM | #15 |
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Was that shortly after running the car? It may have a bit of surface charge that will dissipate and level off to it's standard voltage.
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06-13-2022, 09:31 PM | #16 | |
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06-14-2022, 07:50 AM | #17 |
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I've got the Antigravity ATX20-RS in my car. Everything worked fine for the first 11 months or so. Then I was getting ready for an event about 6 weeks ago. I took the car down the road to get gas and the car wouldn't restart. Dead AF. Couldn't even unlock the doors with the fob. Bought a stock battery, put it in the car, drove to the event. Get there and mess around with a multimeter and eventually hit the battery with Eric1855's jump pack. Battery works fine. Put it back in the car. Car runs great in the event, no issues. I bought a jump pack off Amazon to carry around. I've ran 2 locals (250 mile round trip) and went to SCCA Solo Spring Nats (2k mile round trip) without issue.
My default answer is battery. These batteries can get weird on you. |
06-14-2022, 09:25 AM | #18 |
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I got a Shorai LFX36L3-BS12 (4.8 lb) two years ago. I've put ~20k street miles and 20 or so track days on it. I have removed it for winter months but will likely keep it in next winter, supposedly good down to 0F or lower (they recommend putting the lights on for a few minutes at 0F to warm it up a bit prior to trying to start).
Anyway, no problems or weirdness at all, and it starts the car up with greater eagerness than the huge lead-acid battery. |
06-14-2022, 10:12 AM | #19 |
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Been running a 2.5 kg / 5.5lb lithium (Lithiumax) battery for about 2 years with no dramas at all yet with the alternator (touch wood!).
But we dont get super cold temps here, and the car is always on a lithium friendly trickle charger overnight. |
06-14-2022, 12:17 PM | #20 |
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I took the voltage at the battery before I started it so it had been sitting for a day. I checked the voltage again after running it briefly and it was the same 13.3 volts.
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06-14-2022, 12:22 PM | #21 | |
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I know with our 48v systems, seriesing 4 group 34 12v batteries nets around 51v, but the equivalent lifepo4 battery pack is around 53v.
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06-14-2022, 08:00 PM | #22 |
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I checked another battery tender lithium iron battery and it was also at 13.3 volts (completely disconnected from a car and sitting on a workbench). My stock battery was 12.7 (disconnected from car). Now out of curiosity would someone else check there different brand lithium battery for what voltage it is at while car is off?
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06-14-2022, 08:35 PM | #23 | |
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06-14-2022, 10:07 PM | #24 |
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Yes lithium batteries actually have a higher resting voltage than your traditional lead acid batteries. The chemistry is just works that way. And from what I'm seeing is a mixed reports that for some people take last year's and for others they die within weeks. I'm guessing what is more important now that I'm reading into a lot of this is the actual BMS being used in these batteries. when it comes to these battery BMS is probably more important.
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07-03-2022, 05:18 PM | #25 |
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Voltage logged
For future reference for anyone else running down this issue.
Today on the way back from an AutoX the car cut out a couple more times so I plugged in the OBD reader and logged the voltage. The couple of times I caught the car cutting out the voltage was spiking high. I only had the graph set to a max of 16 voltages which it pegged out so I am not sure of what voltage it got to. Also the temperature of the battery (measured with an infrared thermometer) was ~120 F which seems normal for a car operating in 85 F ambient temp. |
07-03-2022, 06:33 PM | #26 | |
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An abnormally high voltage means there is nothing wrong with the alternator. It is doing what it is being told to do. Now we compare the graph to what you feel.
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07-03-2022, 07:20 PM | #27 |
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The short spike in voltage corresponds with the cut out of the engine and speedo going to zero, it is short period of time less than a full second.
I agree the alternator is not the cause I even went back to the original one as the new one was no better. At this point I am planning to just remove the battery and go back to the stock one and take the weight hit (I'm not competitive enough for it to matter anyway). |
The Following User Says Thank You to Yetti For This Useful Post: | Ultramaroon (07-03-2022) |
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