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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Weight Reduction Data Compilation



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      08-24-2021, 09:37 PM   #111
BSM n54iS
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Bumping this compilation thread, lotta good data.

In case anyone hasn't seen Antigravity has a plug n' play Li battery for us and the m3 guys, drops 43lb. If you're needing a new battery anyways for 250-300 and wanted to drop weight, pretty good option. EAS recommends the 40ah and even though it's a lot less than our 90ah the 1500ca makes up for it (from what I've read) and the AG battery has a auto-restart feature, haven't been able to find a bad review or instance happening yet

https://antigravitybatteries.com/pro...tive/ag-h6-rs/

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Originally Posted by thormessiah View Post
Has anyone gotten the sunroof delete offered by Nelsonracing? Looks amazing and you cut down on 33 pounds up top.
Not yet, I've been looking into it
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      08-25-2021, 07:52 AM   #112
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Whats the over voltage cut off? Some modern cars run at 15v for short time as part of maintenance cycle.
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      08-25-2021, 03:20 PM   #113
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Quote:
Originally Posted by BdSM n54iS View Post
Bumping this compilation thread, lotta good data.

In case anyone hasn't seen Antigravity has a plug n' play Li battery for us and the m3 guys, drops 43lb. If you're needing a new battery anyways for 250-300 and wanted to drop weight, pretty good option. EAS recommends the 40ah and even though it's a lot less than our 90ah the 1500ca makes up for it (from what I've read) and the AG battery has a auto-restart feature, haven't been able to find a bad review or instance happening yet

https://antigravitybatteries.com/pro...tive/ag-h6-rs/



Not yet, I've been looking into it
My oem battery was the 90ah and I’ve had the 30ah Antigravity for just over a year and it’s performed flawlessly. So yes the 40ah is certainly good to go, even the 30ah if you ask me.
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      08-25-2021, 06:13 PM   #114
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Originally Posted by Biginboca View Post
My oem battery was the 90ah and I’ve had the 30ah Antigravity for just over a year and it’s performed flawlessly. So yes the 40ah is certainly good to go, even the 30ah if you ask me.
Nice! Good to see another positive review for them on our platform, how did you end up coding it?

Also EAS is a forum sponsor so I plan on purchasing from them, hopefully they have some package deals going on for us or something

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Whats the over voltage cut off? Some modern cars run at 15v for short time as part of maintenance cycle.
No idea, I know for charging purposes it has a management system to prevent over charging.
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      08-25-2021, 08:37 PM   #115
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Quote:
Originally Posted by BdSM n54iS View Post
Nice! Good to see another positive review for them on our platform, how did you end up coding it?
Per Antigravity instructions I coded for the lowest output AGM. I canít remember offhand what all the options were but I think it was 60AH. I purchased mine direct from Antigravity and I have no regrets. The battery has some nice features besides the weight loss also, I have it set to send state of charge updates to my phone every 24 hours. It also has a built in jump start which I havenít needed, even after sitting for a week with comfort access the battery has never shown less than 97% charged.
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      08-26-2021, 07:19 AM   #116
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Quote:
Originally Posted by BdSM n54iS View Post
Nice! Good to see another positive review for them on our platform, how did you end up coding it?

Also EAS is a forum sponsor so I plan on purchasing from them, hopefully they have some package deals going on for us or something



No idea, I know for charging purposes it has a management system to prevent over charging.
You know what the battery does to protect from overcharging? It disconnects itself from the car.
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      08-26-2021, 09:56 AM   #117
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Quote:
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You know what the battery does to protect from overcharging? It disconnects itself from the car.
I put a link of the product for those to check out if they wanted... I'm not a sales rep
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      08-26-2021, 11:48 AM   #118
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Just letting you know as this happened to me with similar battery.
Voltage went up near 20v. I'm lucky nothing burnt out.
Just make sure they have tested these in the car you have.
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      07-08-2022, 03:42 AM   #119
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I removed the plastic covers under the car. I'm talking about the ones under the passenger & drivers seat. About 2 lbs of sand, rocks, and dirt came out of each side. lol
13-year-old car 115k miles
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      10-18-2022, 11:06 AM   #120
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I wish they had quality options for carbon fiber fenders and hoods for these cars. That's 50 pounds of the front easy
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      10-27-2022, 03:18 PM   #121
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Quote:
Originally Posted by thormessiah View Post
I wish they had quality options for carbon fiber fenders and hoods for these cars. That's 50 pounds of the front easy
Do we not have plenty of options for CF hoods also idk about m cars but non m fenders are plastics so getting CF doesn't seem like it would save a lot of weight
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      10-28-2022, 01:36 AM   #122
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Quote:
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Quote:
Originally Posted by thormessiah View Post
I wish they had quality options for carbon fiber fenders and hoods for these cars. That's 50 pounds of the front easy
Do we not have plenty of options for CF hoods also idk about m cars but non m fenders are plastics so getting CF doesn't seem like it would save a lot of weight
The seibon carbon fiber ones are pretty trash in my honest opinion. Fitment is whack and the clearcoat starts to peel quickly after a few months.
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      11-28-2022, 09:36 PM   #123
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Carbon door cards and roofs are now an option, along with a very expensive seat delete lol
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      12-08-2022, 07:16 AM   #124
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Quote:
Originally Posted by BrianMN View Post
My current Car's weight is 3388lbs with full fluids and a full tank of fuel (95.4lbs), no driver.

My weight loss for track events:

Rear Seat- Back: 40 LBS
Rear Seat- Bottom: 14lbs
Battery Cover (With Tools): 3.1 lbs
Trunk Lining (both sides) plus rear plastic piece- 5.2lbs
Interior Trim Pieces- B Pillar and door flooring- 3.8 lbs
Easily Removable Seat Belt Pieces- 6.8 lbs
Hood Cowling, Cabin Air Filter, wire holder, ECU & ABS Covers - 10 LBS
Trunk Bottom- 9.6lbs
Trunk Insert- 1.5lbs
AMS Exhaust= 35lbs...40 lb savings
AR Design downpipes- 12lbs...3lb savings over OEm Downpipes- (15lbs)
Carbon Fiber trunk- 12lbs...15lb savings over OEM Trunk
Forgestar Wheels-18.5-19.5lbs..6lbs each wheel, 24lbs total
Recaro Pole positions-total of 83lbs savings

Weight ADDed
AMS Intercooler ??maybe 10lbs heavier than OEm
Complete custom undertray/ diffuser/Splitter/sideskirt fences- 65lbs (will be making writeup next)
Custom harness bar with Schroth Profi II 6pt harnesses- 18lbs

This would equal 255lbs lost and a gain of 93lbs...so a net loss of 163.

In theory; this would put my car at 3386...so with an actual weight of 3388 I'm only off by 2lbs!!
OEM Roof = 22lbs.
Challenge/IND Distribution CF roof = 11lbs.
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