|
|
|
11-24-2021, 12:53 PM | #1 |
Supreme Galactic Commander (one galaxy over...)
674
Rep 1,778
Posts |
Race battery
So what are the recommendations and issues I should consider? Stock battery is going out on the 135, figure now is the time to make the decision.
__________________
Best,
Andy '12 E82-PS2,Stoptechs,Clubsports+M3 bits,Accusump,Wagner DP+EVO III FMIC,ERCP,BMS Intake,Mason Strut Bar,Wedge Tune |
11-26-2021, 06:36 AM | #2 |
Enlisted Member
64
Rep 48
Posts |
From what I recall reading, it's just to make sure that you register the battery correctly and that all of the lightweight battery options are less than the lowest setting in the registration setup.
That being said, HPA makes a lightweight tray for Braille and they advertise saving 30lbs with the 21lb Braille battery and their tray. For $440, not bad. https://www.hpashop.com/HPA-Battery-...-and-mount.htm The Antigravity batteries are really interesting, but so expensive they're kinda out of the running for me. I'll follow along, I'm thinking of doing one for next autocross season... It's easier for the car to lose 30lbs than it is for me!! |
Appreciate
1
AndyW673.50 |
11-26-2021, 02:43 PM | #3 | |
Supreme Galactic Commander (one galaxy over...)
674
Rep 1,778
Posts |
Quote:
I hear you on the car losing weight easier than the driver...lol.
__________________
Best,
Andy '12 E82-PS2,Stoptechs,Clubsports+M3 bits,Accusump,Wagner DP+EVO III FMIC,ERCP,BMS Intake,Mason Strut Bar,Wedge Tune |
|
Appreciate
0
|
11-27-2021, 10:33 AM | #4 |
Lieutenant
399
Rep 467
Posts
Drives: 11 128i 6MT Sport
Join Date: Sep 2010
Location: Rock Hill, SC
|
Definitely would be interested in your experience if you go with the ATX-30, would you run it all the time or just in the warmer months/track season?
__________________
11 128i slicktop
13 WK2 19 Alltrack S |
Appreciate
0
|
11-27-2021, 11:26 PM | #5 |
Supreme Galactic Commander (one galaxy over...)
674
Rep 1,778
Posts |
All the time. I'd put it on a trickle charger in the winter months tho.
__________________
Best,
Andy '12 E82-PS2,Stoptechs,Clubsports+M3 bits,Accusump,Wagner DP+EVO III FMIC,ERCP,BMS Intake,Mason Strut Bar,Wedge Tune |
Appreciate
1
spidertri399.00 |
11-29-2021, 08:52 AM | #6 |
Captain
500
Rep 647
Posts |
I just run an H4. There are only holes in the battery tray for H6, 7, and 8 but I made a little metal piece that has holes drilled and tapped for H5 and H4, then just use the OEM mounting bracket and everything else. It's substantially lighter, fits basically like OEM and I've had no issues with it starting or anything.
That said, I do have far less electronic load in the car than stock and I don't drive it in the winter so your mileage may vary. |
11-29-2021, 06:05 PM | #7 |
Lieutenant
120
Rep 475
Posts
Drives: 2009 Crimson Red 135i
Join Date: Mar 2008
Location: Sterling, Va
|
I ran the ATX-20HD for a year, but recently it has stopped working. I can jump the car, and it runs, but as soon as I shut it off, the battery turns off.
Going to send it back. Maybe the 30 is more appropriate? For most of the year, I could leave it connected for several weeks, and it would start the car no problem. If the battery is very cold, you can turn the lights on, for about 10 seconds - that warms it up enough to start. At least until recently! One thing I'm confused about is: You need to use a Lithium charger for it. But, apparently it's OK to use the factory charging system which is expecting an AGM. I don't get that part. -Joe |
12-03-2021, 06:50 AM | #8 |
Lieutenant
229
Rep 458
Posts |
I've seen too many friends have issues with these lightweight batteries to consider using one. In my E36 M3 race car, I went with an AGM replacement on the smaller side of the stock spec and never worried about the battery again. Yes it's an easy way to shed 30-40 lbs but having that extra weight in the rear of the car can actually be helpful for weigh distribution. Unless you're chasing super low weight for some sort of unlimited TT/race class, I wouldn't bother. Spend the extra money on more seat time, it's a better investment in your lap times.
|
Appreciate
5
|
12-15-2021, 12:14 PM | #9 | |
Colonel
1208
Rep 2,028
Posts |
Quote:
The LI batteries are even worse since <40f and the cold cranking amps really suffer. |
|
Appreciate
0
|
12-15-2021, 07:57 PM | #10 |
Lieutenant
120
Rep 475
Posts
Drives: 2009 Crimson Red 135i
Join Date: Mar 2008
Location: Sterling, Va
|
I was able to leave it in the garage for 2 maybe even 3 weeks and it started fine. Car is only used for track; not a daily.
I'm not convinced that the battery management handles the factory charging system correctly. What charger are you using? |
Appreciate
0
|
12-15-2021, 10:22 PM | #11 | |
Supreme Galactic Commander (one galaxy over...)
674
Rep 1,778
Posts |
Quote:
__________________
Best,
Andy '12 E82-PS2,Stoptechs,Clubsports+M3 bits,Accusump,Wagner DP+EVO III FMIC,ERCP,BMS Intake,Mason Strut Bar,Wedge Tune |
|
Appreciate
0
|
12-17-2021, 08:23 AM | #12 | |
Colonel
1208
Rep 2,028
Posts |
Quote:
Maybe it is a charging issue but with how little I drive the car I doubt ~2-3,000 miles per year of alternator output would kill the battery life especially in the case of the 20lb AGM batteries that were coded correctly. It's the deep discharges. I believe the PCM attached to these LI batteries will clip the charging voltage if it goes too high protecting the battery... and the charge current not matching will affect how long the battery takes to re-charge not so much the battery life... source: https://relionbattery.com/blog/charg...hium-batteries Li charging profile and charger is ideal but I don't think it impacts the battery life as much as lead acid/agm profiles for the reasons mentioned in the article. Li doesn't care if it is at 50% capacity. Lead acid/agm does and needs to be recharged before being discharged again. Li does care about being discharged deeply and rapidly though (cranking). If you go for anti-gravity, DO NOT get the "restart" battery. It is useless for a car. You'll have to crawl through your trunk to press the restart button and then pray the battery even has enough capacity left to crank the car. anti-gravity now recommends their "HD" battery for car applications. HD specifically targets improvements to support cranking a car (power/capacity). The atx20-HD is what I would go for but it does cost a few dollars more than the RS version. Last edited by bbnks2; 12-17-2021 at 08:37 AM.. |
|
Appreciate
1
AndyW673.50 |
12-18-2021, 05:41 PM | #13 |
Lieutenant
120
Rep 475
Posts
Drives: 2009 Crimson Red 135i
Join Date: Mar 2008
Location: Sterling, Va
|
Yeah - the ATX20-HD is the version I had. Latest 1 year. I sent it back; will see if they warranty it.
|
Appreciate
0
|
12-25-2021, 08:56 PM | #14 | |
Boost
1354
Rep 3,693
Posts
Drives: 135i M-Sport
Join Date: Feb 2014
Location: Valley of Silicon, CA - United States
|
Quote:
Obviously needs to be on a charger at all times if you're not driving it > 1-2 times a week. I have the OEM spec Antigravity 40ah battery in a street car and it's been great for 1.5yrs, I've even let that car sit for 10+ days without issue.
__________________
F80 M3 TrackBoi, Z4MC GarageBoi, 1M Clone StreetBoi
|
|
Appreciate
1
AndyW673.50 |
01-23-2022, 04:21 PM | #16 |
Boost
1354
Rep 3,693
Posts
Drives: 135i M-Sport
Join Date: Feb 2014
Location: Valley of Silicon, CA - United States
|
Yeah the lipo4 specific trickle charger seemed to help a lot.
__________________
F80 M3 TrackBoi, Z4MC GarageBoi, 1M Clone StreetBoi
|
Appreciate
0
|
01-28-2022, 07:40 PM | #17 |
Lieutenant
120
Rep 475
Posts
Drives: 2009 Crimson Red 135i
Join Date: Mar 2008
Location: Sterling, Va
|
FYI - antigravity did send me a new ATX20-HD. We'll see how long it lasts!
-Joe |
Appreciate
0
|
Post Reply |
Bookmarks |
|
|