Balancing rear weight - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

radroach · 08-27-2016, 10:22 AM

From the OEM Audio+ threads about the subwoofer, somebody reported that the stock setup on these cars is 30lbs underweight in the right rear and that adding a subwoofer fixes the weight distribution in the car. Can anybody confirm? And if so, will it provide better stability?

nikitopo · 08-27-2016, 10:26 AM

I don't think so. The car is very good balanced with an average driver weight. Together with the driver, you have almost same weight in both diagonals.

weight(LF) + weight(RR) ~ weight(RF) +weigh(LR)

LF: Left Front
RR: Right Rear
RF: Right Front
LR: Left Rear

EDIT:
Check the weight of a stock car with a 175lbs driver here: http://www.ft86club.com/forums/showp...89&postcount=1

jeepmor · 08-28-2016, 02:43 PM

If you're 230lbs like me, go ahead and put that subwoofer in is my take. Good data from nikitopo, thanks.

ryoma · 08-28-2016, 03:17 PM

if you already have adjustable suspension like coilovers, then get a corner balance. you can solve your problem without spending $1500+ for the OEM audio+ setup.

redlined600 · 08-28-2016, 04:40 PM

I'll take less weight over an ideal weight distribution every time.

Captain Snooze · 08-31-2016, 03:18 AM

Quote:

Originally Posted by redlined600

I'll take less weight over an ideal weight distribution every time.

This.

Twinz · 08-31-2016, 07:28 AM

That was me. Before:

After:

The car has TRD springs and I am 170 lbs.

I didn't do the sound system to improve performance. I simply could not stand the stock system and was pleasantly surprised to learn that it doesn't hurt the corner balance of the car.. (it actually helps)

More to the OP's question, I wouldn't expect a noticable difference in performance (good or bad) from such a small amount of weight.

NissanGuy · 09-05-2016, 06:36 PM

You'd get better value from refueling more often.

08-27-2016, 10:22 AM	#1
radroach Senior Member Join Date: Feb 2013 Drives: car Location: usa Posts: 2,162 Thanks: 1,028 Thanked 867 Times in 530 Posts Mentioned: 35 Post(s)	Balancing rear weight From the OEM Audio+ threads about the subwoofer, somebody reported that the stock setup on these cars is 30lbs underweight in the right rear and that adding a subwoofer fixes the weight distribution in the car. Can anybody confirm? And if so, will it provide better stability?

08-27-2016, 10:26 AM	#2
nikitopo Senior Member Join Date: Mar 2014 Drives: '15 BRZ RA Location: Greece Posts: 3,787 Thanks: 2,417 Thanked 1,947 Times in 1,263 Posts Mentioned: 29 Post(s)	I don't think so. The car is very good balanced with an average driver weight. Together with the driver, you have almost same weight in both diagonals. weight(LF) + weight(RR) ~ weight(RF) +weigh(LR) LF: Left Front RR: Right Rear RF: Right Front LR: Left Rear EDIT: Check the weight of a stock car with a 175lbs driver here: http://www.ft86club.com/forums/showp...89&postcount=1 Last edited by nikitopo; 08-27-2016 at 10:40 AM.

08-28-2016, 03:17 PM	#4
ryoma Senior Member Join Date: Mar 2015 Drives: 2015 Subaru BRZ Limited CWP Location: SoCal Posts: 1,561 Thanks: 34 Thanked 669 Times in 469 Posts Mentioned: 13 Post(s)	if you already have adjustable suspension like coilovers, then get a corner balance. you can solve your problem without spending $1500+ for the OEM audio+ setup. __________________ My 2015 CWP BRZ Build

08-28-2016, 04:40 PM	#5
redlined600 Senior Member Join Date: Nov 2014 Drives: Fr-s Location: MN Posts: 774 Thanks: 139 Thanked 555 Times in 288 Posts Mentioned: 5 Post(s)	I'll take less weight over an ideal weight distribution every time. __________________ Build log

08-31-2016, 07:28 AM	#7
Twinz Senior Member Join Date: Jun 2016 Drives: 2016 FR-S MT, 2015 Scion FR-S AT, Location: SW Fl Posts: 487 Thanks: 271 Thanked 307 Times in 180 Posts Mentioned: 3 Post(s)	That was me. Before: After: The car has TRD springs and I am 170 lbs. I didn't do the sound system to improve performance. I simply could not stand the stock system and was pleasantly surprised to learn that it doesn't hurt the corner balance of the car.. (it actually helps) More to the OP's question, I wouldn't expect a noticable difference in performance (good or bad) from such a small amount of weight. Last edited by Twinz; 08-31-2016 at 08:50 AM.

08-28-2016, 02:43 PM	#3
jeepmor Senior Member Join Date: Apr 2014 Drives: 84 CJ7, 08 Duramax, 2014 FRS Location: Oregon Posts: 487 Thanks: 347 Thanked 131 Times in 105 Posts Mentioned: 13 Post(s)	If you're 230lbs like me, go ahead and put that subwoofer in is my take. Good data from nikitopo, thanks.

09-05-2016, 06:36 PM	#8
NissanGuy Senior Member Join Date: Feb 2014 Drives: Strangely. Location: Burbank, CA Posts: 390 Thanks: 104 Thanked 142 Times in 100 Posts Mentioned: 6 Post(s)	You'd get better value from refueling more often. __________________ My FR-S has a build thread! (It's mostly full of Nissans)

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