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Old 10-11-2006, 08:46 PM
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Battery Changes...

Someone mentioned to me that NASCAR racers change batteries during races. I have not followed this subject or know much about professional racing.

Can someone tell me why changing batteries would be important during a race? It would seem that a new battery which lasts for years in any other vehicle would certainly hold out for the several hours of almost any race unless no charging were taking place.

I thought that maybe they didn't put alternators on the engines to avoid the HP load to turn the alternator but was told that they do have alternators on their engines. That blew away my only guess that maybe they changed batteries because they lost charge.

Any guess what might be going on?

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Old 10-11-2006, 09:00 PM
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From what I understand and have seen on TV is that the only time they change batteries is when they have a charging problem. And from my memory I believe that the battery is accessed from the left rear wheel house with the tire off I think. I'm sure someone more involved with nascar could answer.

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Old 10-12-2006, 05:02 AM
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Battery Changes...

Hi John,
Thank you for the comment. It sounds reasonable to me that a correctly performing charging system should keep the battery useful over the duration of a race.

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Old 10-12-2006, 12:01 PM
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I'm no Nascar expert, but I've never seen them change a battery during a race. The extra seconds in the pit wouldn't make up for any gains on the track. Even if the battery died or wore out, the alternator would keep it running, maybe at the penalty of 1-2 hp, but I can't imagine a battery dying that fast.

IMO, they don't change batteries during a race.
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Old 10-12-2006, 03:04 PM
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I have seen them changed.
A couple of times with an ignition issue--(other items changed as well)

Don't see it too often though

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Old 10-12-2006, 04:02 PM
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There have been a few instances this year of battery changes. In the past it was done by removing the left rear tire and accessing the battery box. On the large tracks they can change them without losing a lap, short tracks 1 or more laps are lost. The Hendricks teams carry two batterys and can change over from inside the car by switch. There was someone else that had two on board and "switched" during a race this year. The car has to weigh 3500 #s anyway so they use the extra battery in place of ballast.
When their charging systems quit, they can continue on the battery for awhile but it usually dies before the end of the race.
They run some high draw ignition systems along with electric fans (during pit stops and cautions), usually 4 to 6 brake fans, tranny cooler fan, rear end cooler fan, and depending on the temps they will run an "air conditioner" to supply cool air to the drivers helmet, and/or a cool suit that has a pump.
It seems that this year there have been several battery's going dead.
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