will I notice a difference? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Boofneenee · 02-07-2015, 10:44 AM

Hi, currently have lighter than stock rims weighing 17.2 lb each. Looking to get an even lighter set of rims that weigh 14.5. Stock wheels way 20. Something for reference. Do you think in will notice a difference in response, acceleration etc with these even lighter rims? When I dropped from the stock to these 17.2 weight their was a change for sure. Thx

CyberAkuma · 02-07-2015, 03:49 PM

I changed to 3 piece wheels and didn't notice anything, but then again I just street drive and never on the track. Maybe then there will be a difference

stugray · 02-07-2015, 04:04 PM

take your spare tire out of the trunk and see if you can feel a difference.

raven1231 · 02-07-2015, 04:49 PM

Quote:

Originally Posted by stugray

take your spare tire out of the trunk and see if you can feel a difference.

That's not even close to the same thing...

stugray · 02-07-2015, 05:10 PM

Quote:

Originally Posted by raven1231

That's not even close to the same thing...

Oh! So you have done the experiment! Cool.

However you are right.
Shedding 10.8 lbs from the wheels versus shedding > 15 lbs from the trunk are NOT the same.
Removing the spare will make a BIGGER difference.

However I still contend that the driver will not FEEL a difference under either option (hence why I said to do the experiment).

Now - will an experienced driver, on a track, with a datalogger be able to detect the difference between stock rims and rims that weigh 2.7 lbs lighter (using the data)?
Maybe.

How about this experiment: Could a driver (on the street) be able to tell the difference in handing from a set of tires with 20,000 miles on them versus 40,000 miles?
Because that is probably the difference of ~3 lbs per wheel in lost tread....

aznatama · 02-07-2015, 06:31 PM

Unsprung weight make a lot more difference than sprung weight. There's also rotational mass involved with accelerating and braking. losing 10lb unspring weight will make a lot more of a difference than removing your spare for sure.

However, wether you can feel it or not... if you could feel the difference between stock and your current wheels, provided tires were the same weight, then yes, you'll feel a difference going lighter. However, be aware of wheel strength.

swarb · 02-08-2015, 12:21 AM

you would be dropping weight with the wheels and adding it back on with heavier tires. since the weight is towards the outside diameter, it would actually "feel" heavier. I added about 5lbs each corner and the car felt slower acceleration for the first few days, after that I didn't notice. The improved grip alone out weighed the acceleration loss.

aznatama · 02-08-2015, 02:44 AM

Why would the tires be heavier? No mention of change in wheel size, only weight.

swarb · 02-08-2015, 03:56 AM

I assumed the op was getting new tires also. My mistake. Not worth spending money on couple pounds savings on wheel weight while that money would be better spent on tires.

aznatama · 02-08-2015, 10:21 AM

Even if new tires, they should be about the same weight. With everything else being the same, a lighter wheel will be more noticeable than over 2-3x the weight savings on sprung
weight. Tire weight is not a factor since you would be using the same tire for both wheels.

If you could feel a change from 20 to 17.2, you will feel 17.2 to 14.5.

I'm assuming op is going from a cast wheel to a forged wheel of the same diameter. Otherwise, if going down in diameter, there are a lot of other factors to consider.

WolfsFang · 02-08-2015, 08:51 PM

I 100% noticed a difference when I would put my ccw's on, but then again they were 16's. My friend who owns a Genesis also says he can noticed a difference when he puts on his rpf1's compared to his stocks.

Sent from my XT1060 using Tapatalk

mrk1 · 02-08-2015, 09:21 PM

Did you notice the change from 20 lb rims to the 17? Its the same weight drop from 17 to 14.

When I had my 100hp mini I hated putting the stockers back on, felt like I had a sack of rocks in the trunk.

tennisfreak · 02-09-2015, 04:31 PM

Quote:

Originally Posted by stugray

Oh! So you have done the experiment! Cool.

However you are right.
Shedding 10.8 lbs from the wheels versus shedding > 15 lbs from the trunk are NOT the same.
Removing the spare will make a BIGGER difference.

However I still contend that the driver will not FEEL a difference under either option (hence why I said to do the experiment).

Now - will an experienced driver, on a track, with a datalogger be able to detect the difference between stock rims and rims that weigh 2.7 lbs lighter (using the data)?
Maybe.

How about this experiment: Could a driver (on the street) be able to tell the difference in handing from a set of tires with 20,000 miles on them versus 40,000 miles?
Because that is probably the difference of ~3 lbs per wheel in lost tread....

I sure as hell noticed taking the spare tire and jack kit out of mine.

Rear end slides around even easier than before!

TylerLieberman · 02-09-2015, 04:39 PM

1. Drive around car as is
2. Switch to lighter wheels
3. Remove spare tire and tools from trunk
4. Run single exit exhaust
5. Notice the difference from nearly 100lbs dropped off the car's overall weight

^That's what I did. I definitely noticed.

02-07-2015, 10:44 AM	#1
Boofneenee Go-Kart Enthusiast Join Date: Aug 2013 Drives: Toyota Scion FRS Location: Yup Posts: 800 Thanks: 576 Thanked 309 Times in 188 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	will I notice a difference? Hi, currently have lighter than stock rims weighing 17.2 lb each. Looking to get an even lighter set of rims that weigh 14.5. Stock wheels way 20. Something for reference. Do you think in will notice a difference in response, acceleration etc with these even lighter rims? When I dropped from the stock to these 17.2 weight their was a change for sure. Thx __________________ FRS Current mods: K&N air filter, OFT, OFH, berk high flow cat front pipe, Q300 exhaust, lighter wheels

02-07-2015, 06:31 PM	#6
aznatama Senior Member Join Date: May 2014 Drives: 2014 BRZ MT (Sold); 2006 V70R Location: Fairfax Posts: 873 Thanks: 10 Thanked 186 Times in 150 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Unsprung weight make a lot more difference than sprung weight. There's also rotational mass involved with accelerating and braking. losing 10lb unspring weight will make a lot more of a difference than removing your spare for sure. However, wether you can feel it or not... if you could feel the difference between stock and your current wheels, provided tires were the same weight, then yes, you'll feel a difference going lighter. However, be aware of wheel strength. __________________ '14 BRZ LTD MT DGM

02-08-2015, 02:44 AM	#8
aznatama Senior Member Join Date: May 2014 Drives: 2014 BRZ MT (Sold); 2006 V70R Location: Fairfax Posts: 873 Thanks: 10 Thanked 186 Times in 150 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Why would the tires be heavier? No mention of change in wheel size, only weight. __________________ '14 BRZ LTD MT DGM

02-08-2015, 10:21 AM	#10
aznatama Senior Member Join Date: May 2014 Drives: 2014 BRZ MT (Sold); 2006 V70R Location: Fairfax Posts: 873 Thanks: 10 Thanked 186 Times in 150 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Even if new tires, they should be about the same weight. With everything else being the same, a lighter wheel will be more noticeable than over 2-3x the weight savings on sprung weight. Tire weight is not a factor since you would be using the same tire for both wheels. If you could feel a change from 20 to 17.2, you will feel 17.2 to 14.5. I'm assuming op is going from a cast wheel to a forged wheel of the same diameter. Otherwise, if going down in diameter, there are a lot of other factors to consider. __________________ '14 BRZ LTD MT DGM

02-08-2015, 08:51 PM	#11
WolfsFang Scrape Master Join Date: Jun 2012 Drives: Goal: Oldest FRS State Side Location: North NJ Posts: 1,161 Thanks: 238 Thanked 412 Times in 238 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	I 100% noticed a difference when I would put my ccw's on, but then again they were 16's. My friend who owns a Genesis also says he can noticed a difference when he puts on his rpf1's compared to his stocks. Sent from my XT1060 using Tapatalk __________________ You do realize comparing the BRZ to the FR-S is like comparing which hand you love masterbating too right? Last edited by WolfsFang; 02-08-2015 at 11:48 PM.

02-07-2015, 04:04 PM	#3
stugray Banned Join Date: Sep 2013 Drives: 2013 GBS BRZ Limited Location: Colorado Posts: 1,925 Thanks: 627 Thanked 1,445 Times in 711 Posts Mentioned: 41 Post(s) Tagged: 0 Thread(s)	take your spare tire out of the trunk and see if you can feel a difference.

02-08-2015, 12:21 AM	#7
swarb Senior Member Join Date: Sep 2014 Drives: BRZ Location: Los Angeles Posts: 3,053 Thanks: 1,773 Thanked 2,451 Times in 1,271 Posts Mentioned: 79 Post(s) Tagged: 0 Thread(s)	you would be dropping weight with the wheels and adding it back on with heavier tires. since the weight is towards the outside diameter, it would actually "feel" heavier. I added about 5lbs each corner and the car felt slower acceleration for the first few days, after that I didn't notice. The improved grip alone out weighed the acceleration loss.

02-08-2015, 03:56 AM	#9
swarb Senior Member Join Date: Sep 2014 Drives: BRZ Location: Los Angeles Posts: 3,053 Thanks: 1,773 Thanked 2,451 Times in 1,271 Posts Mentioned: 79 Post(s) Tagged: 0 Thread(s)	I assumed the op was getting new tires also. My mistake. Not worth spending money on couple pounds savings on wheel weight while that money would be better spent on tires.

02-08-2015, 09:21 PM	#12
mrk1 Senior Member Join Date: Mar 2013 Drives: Sterling BRZ Ltd Location: New England Posts: 1,702 Thanks: 403 Thanked 1,389 Times in 671 Posts Mentioned: 20 Post(s) Tagged: 2 Thread(s)	Did you notice the change from 20 lb rims to the 17? Its the same weight drop from 17 to 14. When I had my 100hp mini I hated putting the stockers back on, felt like I had a sack of rocks in the trunk. __________________ The Build Thread GT28RS - eBoost2 - 3.91 Final Drive - Supra LSD

02-09-2015, 04:39 PM	#14
TylerLieberman Senior Member Join Date: Dec 2011 Drives: '24 GR86 Location: Arizona Posts: 3,676 Thanks: 655 Thanked 3,344 Times in 1,577 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	1. Drive around car as is 2. Switch to lighter wheels 3. Remove spare tire and tools from trunk 4. Run single exit exhaust 5. Notice the difference from nearly 100lbs dropped off the car's overall weight ^That's what I did. I definitely noticed. __________________ Old 2013 FRS Build Thread (SOLD) Hakone 86 GR Build Thread (SOLD)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Did anyone notice?	FRSNewb	Off-Topic Lounge [WARNING: NO POLITICS]	2	07-21-2014 02:59 PM
Wheel weight, will I notice it?	Re~Mix	Wheels \| Tires \| Spacers \| Hub -- Sponsored by The Tire Rack	7	01-09-2014 02:29 AM
Does anyone else notice the similarities?	Wes B.	Other Vehicles & General Automotive Discussions	3	05-19-2013 08:40 AM
Anyone notice a delay with their car remote?	IloveBaldEagles	Issues \| Warranty \| Recalls / TSB	5	11-26-2012 07:10 PM
Anyone else notice...	Linseal	Scion FR-S / Toyota 86 GT86 General Forum	5	06-03-2012 11:18 PM

User Name		Remember Me?
Password