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Discussion Starter #1 (Edited)
I weighed the batteries and the new battery is an astounding 41.6lbs lighter than the OEM. I made a simple strap battery hold down with a rubber mat under the battery. The battery of choice was the Antigravity ATX-20 Restart. It has built in circuitry fro over/under charge protection and will jump start a car up to three times with the press of a button.

The car starts and runs like normal, verifying voltage from the control module through OBDII. I have now driven the car for two days and have some feed back. WOW!!!!!
Over 40lbs weight reduction over the heaviest portion of the car is felt and it is drastic!
Just rolling out of the garage, turning the steering wheel you can feel the front end is lighter. I did not expect this to such a degree. While driving I kept an open mind and suppressed the placebo effect as swore that is what I felt. But no! I have driven this car hard and it turns in better, feels lighter, rolls easier (less throttle), stops easier. Man what a difference!


Including my wheels I have effectively reduced the cars overall weight by almost 90lbs!!!! no other mods and the car feels soooo goood!


EDIT: adding a CF hood



Ill be weighing the car soon and have a calculated estimate of 2935lbs wet.



Tune? I don't need no stinking tune! ;)
 

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How are you getting 2935lbs? Stock weight is just over 3100lbs if I remember correctly. Even if you save 90lbs with a lighter battery and wheels, where is the rest of the weight reduction coming from?
 

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Discussion Starter #3 (Edited)
The 3100 is the manufacturer listed weight. The U.S. spec car actually weighs less. I am downloading the image of the FB group showing 2977lbs with only wheel and tire weight reduction. I am adding a CF hood which will net me near 35lbs, hopefully. 40+41.6+35est=116.6lbs weight reduction



I forgot to mention that in my initial post but I have edited it now.


The best part is I will have effectively dropped the nose weight of nearly 100lbs when done. That is massive on this fwd weight biased car.




How are you getting 2935lbs? Stock weight is just over 3100lbs if I remember correctly. Even if you save 90lbs with a lighter battery and wheels, where is the rest of the weight reduction coming from?
 
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Interesting. Thank you for sharing. When you took off your stock wheels, did you check their weight? I think I remember seeing 28lbs for the 19" PP variant and wondering if that's true.



Does anyone else have data on how much their US spec N PP weighs stock?
 

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Discussion Starter #6
The PP wheels are 30lbs. I did weigh them and have pictures on the tire thread of both wheel and tire weights


Interesting. Thank you for sharing. When you took off your stock wheels, did you check their weight? I think I remember seeing 28lbs for the 19" PP variant and wondering if that's true.



Does anyone else have data on how much their US spec N PP weighs stock?
 
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Discussion Starter #7
Ill be weighing mine once I install the hood which'll be soon. Using the known weight of the tires wheels and hood I will have the stock weight. The Image I shared is a PP with 19.8 lb wheels and 25 lb tires. The OE tires weigh 21lbs and wheel weighs 30lbs. Adjusting weight for OE wheels and tires puts it at 3001.8lbs
 

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Ill be weighing mine once I install the hood which'll be soon. Using the known weight of the tires wheels and hood I will have the stock weight. The Image I shared is a PP with 19.8 lb wheels and 25 lb tires. The OE tires weigh 21lbs and wheel weighs 30lbs. Adjusting weight for OE wheels and tires puts it at 3001.8lbs
I'd like to do exactly what you've done, but it costs money to be light. I think a catless DP is more appealing than a battery and wheels. If my budget was not an issue, the battery seems prettty dope and unsprung weight reduction is always noticeable. Which hood are you buying? You seem on track for an overall weight reduction plan. What's next?
 

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Discussion Starter #10
Battery update!

I have switched from the ATX-20 Restart due to capacity issues. While running the electronics would flicker. I believe the issue lies in the smart charging system. The restart batteries have circuitry to protect from over/under voltage Spoke. If you unplug the battery sensor on the negative terminal all works fine. Albeit, the alternator is constantly putting out 14.5 volts as opposed to fluctuating for charge or depending on demand. I spoke with Antigravity and they recommended not to use the Restart batteries. Ironically enough, my GT350R also used a non restart battery and I had no issues. I upgraded to the ATX-20HD, same dimensions much more capacity. The battery sensor is plugged in and operates accordingly. I have been on the new battery now for 2 weeks. No issues. So, if you plan on going with Antigravity for the VN, get a non restart battery. The only down side is the new battery was 50 buck more expensive and gained 2lbs. This battery weighs almost 5lbs.
 
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Discussion Starter #11
Whats next? For track days I am gutting the rear interior. I know the seat backs and bottoms weight 41lbs and also removing the trunk kit which I haven't weighed yet.
The hood is Seibon TS style hood.



I'd like to do exactly what you've done, but it costs money to be light. I think a catless DP is more appealing than a battery and wheels. If my budget was not an issue, the battery seems prettty dope and unsprung weight reduction is always noticeable. Which hood are you buying? You seem on track for an overall weight reduction plan. What's next?
 
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Discussion Starter #13
I don't have that problem. Sorry. But for track work, my car goes on a diet. Feels so much better. Mainly all the weight reduction over the nose.
I need to loose some weight... I am fat. Not the car...
 

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I've been doing a little homework on these batts. Not a bad idea at all. The stock battery if bought from Hyundai is like $270 I was seeing, but the Lithium Batts are that much more expensive. Was seeing some in 70 AH ratings for cars between $400 and up. The longevity of the battery is better, and BMS technology that is on most of them looks soild. My only concern is the N's Alternator charging this type of battery back up. They say it a normal alt. can, but will reduce the life cycles and the percent of power left after so many charge cycles. The reduction in weight is crazy though. I could definitely see where that adds to better performance. Especially after seeing that the battery side front of car on that tire weighs more than the passenger side. Seems like to me the more even you can get would equal better stability.
 

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Discussion Starter #16
I paid $400 for my battery. It has a 5 year warranty. I have used this brand before and had absolutely no issues with the non restart battery. The restart technology doesnt play well with the smart charging systems. The N charging system needs to be reset to learn the new battery. I needed a battery for the winch on my trailer so it only made sense, for the cost and weight reduction, to go with a lithium battery for the N and use the Hyundai battery for the trailer.



I've been doing a little homework on these batts. Not a bad idea at all. The stock battery if bought from Hyundai is like $270 I was seeing, but the Lithium Batts are that much more expensive. Was seeing some in 70 AH ratings for cars between $400 and up. The longevity of the battery is better, and BMS technology that is on most of them looks soild. My only concern is the N's Alternator charging this type of battery back up. They say it a normal alt. can, but will reduce the life cycles and the percent of power left after so many charge cycles. The reduction in weight is crazy though. I could definitely see where that adds to better performance. Especially after seeing that the battery side front of car on that tire weighs more than the passenger side. Seems like to me the more even you can get would equal better stability.
 

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I'm looking at the Antigravity drop in battery for mine, but it looks like they all have the restart feature. I wonder if the restart only was problematic because you were using one of the smaller batteries but I hate to buy it knowing it might be an issue. The one I'm looking at is the stock size. 24Ah so it's almost twice the capacity. I was hoping to use one of the drop ins to simplify installation and get more capacity than their mini batteries have for when I have to park the car for a week during a snow storm. I see they also have their ATX30-HD that's 24Ah and is without the restart, but requires the special mount. Hmm. I guess I will contact antigravity themselves and see what they think about it.



Did anyone ever weigh the stock hood and the Seibon hood to see how much exactly there is to lose there? That's another weight loss item I was considering. The stock hood didn't feel really heavy to me though, it's pretty small. I'm not about to take it off just to weigh it but I'm thinking it's under 20 pounds to start with.
 

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I have had the Antigravity H6/Group-48 24AH for a few months. No problems with it. I have also had 4 track days with it.Antigravity H6/Group-48
I am also considering this battery, do you have any issues with with the accessories being on for a few minutes after turning off the car? I'm trying to decide if it's worth spending extra for the 60Ah version. Thanks in advance for any advice.

-velosterNG
 
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