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12-05-2017, 02:59 PM | #1 |
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LTW Battery Setup
Can anyone post some pictures of their LTW battery setup? What did you all do with the junction box? I understand coding is involved to set amps as close as you can to factory specs for charging purposes.
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12-05-2017, 07:28 PM | #2 | |
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This is how I rigged a 5lb lithium battery (tiny): I zip tied the box to the hold down bracket. I then used a generic battery tie down to keep the battery in place. Drill holes through the floor pan for the hooks. I used new leads off the POS/neg nuts to better reach the battery terminals... Do not bother trying to run a lthium battery in a daily driver unless you're in a very warm climate. I tried a 500cca lithium battery and it performed as poorly as 200cca in 50f weather. Failed to start the car and voltage drop overnight caused frequent codes/issues. I used to have a deka ETX30L (20lb). Only lasted 1 year. I am now running an Odyssey pc925 (23lbs). So far so good. Still not sure the extra money over the deka is worth it. Probably won't last any longer but we will see... Fyi, I daily drive in the Northeast. I would not recommend anything less than 20lb/400cca if you see near 40f temps. Battery won't last long at all even if it does work for a while. Last edited by bbnks2; 12-06-2017 at 11:08 AM.. |
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AndyW667.50 |
12-06-2017, 09:28 AM | #3 |
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15lb Braille equivalent with a Macht Schnell bracket here.
Never any issues starting the car. Not sure if I have a picture of it, but it's pretty self-explanatory. |
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12-06-2017, 09:50 AM | #4 |
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12-06-2017, 11:04 AM | #5 |
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If you remove the top harness then you also remove the ability to monitor/alter charging amperage/battery voltage... I can't imagine that that would be ideal for a car with the factory DME since it relies on the data to go into sleep and recovery modes etc... There is no real reason to remove it and it would require additional coding to remove IBS from the $VO to avoid DME throwing codes.
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AndyW667.50 |
10-21-2019, 08:27 AM | #8 | |
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I found that the PC925 is 28Ah 380cca - how does it compare to the standard AGM (80Ah, 640cca)? Odyssey have a range of AGM batteries. PC1100/ER40 Extreme Racing seems like a good compromise if it will fit. 12.5kg/27.5lbs, 45Ah, 500cca but 1100cca for 5sec burst. |
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10-21-2019, 09:23 AM | #9 | |
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If you don't drive the car much, keep it on a maintainer. Parasitic draw of the BMW electronics will run it flat in about 7-10 days. If you daily in <30f, you may not want to risk such a small battery. The 28lb one might be better."burst" rating aside, the PC925 will struggle in a cold snap and go flat in a few days. best to run two of them in the winter and just take one out in the summer. or, swap stock battery back in etc. |
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10-21-2019, 10:40 AM | #10 |
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Thanks for the update. It sounds promising.
I found some further info that I updated in my post above (I didn't realise you had already replied). What is the benefit of having 80Ah vs 45Ah (or 28Ah like yours) if the car is driven regularly? If the alternator is charging the battery at a rate exceeding what is being drawn, then is it much of an issue having a lower Ah rated battery? Fortunately, we don't get really cold weather - the colder months average 10-25°C, although, min temps can dip into single digits. |
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10-21-2019, 10:47 AM | #11 | |
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Last edited by bbnks2; 10-21-2019 at 10:54 AM.. |
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10-21-2019, 11:44 AM | #12 |
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Keep the junction box.
Also, Lithium batteries are amazing when you get the right one. Contact Anti Gravity batteries and they'll get you sorted. I'll make a post with my new battery soon. Has an app, tons of amperage, weighs 7lbs and can sit for 1 month + without needed a charger.
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10-23-2019, 12:06 PM | #13 | |||
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10-30-2019, 11:10 AM | #14 | |
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edit: checked out their prices, now I understand. Last edited by wook; 10-30-2019 at 11:18 AM.. |
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11-01-2019, 06:22 AM | #15 | ||
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11-05-2019, 10:55 PM | #16 |
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Hey guys - sorry, i'm swamped at the moment and have been prepping the car and balancing a hectic month for work. Can't tell you enough, Antigravity is the way to go. I went with the ATX-30. Send the guys there an email, tell them about your car, how you use it, and they'll tell you what works. Tell them I sent you and I'm sure they'll take care of you. They're all awesome dudes and they live for racing and modding cars.
More soon!
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11-21-2019, 01:46 PM | #17 | |
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11-22-2019, 06:07 PM | #18 | |
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I literally don't worry about it anymore, as if it was a massive 65lb stock one.
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11-22-2019, 06:51 PM | #19 |
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I ran a lifepo4 battery for almost a year without coding anything. Eventually I blew my comfort access module or whatever it's called starting the car with rundown battery. I replaced with lead acid again without coding anything. Never did repair that module, cuz who needs turn signals, high beams, sunroof or windows?
Now I'm gonna put in LTO. Probably won't code. |
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