Car feels strange/less responsive after coilovers - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

csol · 11-25-2019, 01:30 AM

Hi just trying get a bit of understanding whats going before taking it back to the shop to get thid checked out.

Recently got new wheels for my BRZ tS

Rays gramlights 57Transcend and new tyres MPilotSport 4s

Here are my specs

Old Tires: (Pilot Sport 4) 215/40 RS
Old Rim: (STI)18x7.5 +48
Bolt Pattern: 5x100mm

New Tire: (Pilot Sport 4) 255/35 18 94Y
New Rim: 18x9.5 +39
Bolt Pattern: 5x100mm

I got hardrace rear lower control arms and custom coilovers with camber plates.

The car feels very loose now it's hard to describe but it feels like a boat on water when you swerve left and right the responsiveness isn't there anymore like before its somewhat delayed. So you would turn left and the car would respond later than expected and the turn is very smoothed out like you are driving a boat in water.

Any idea what this could be because?

86MLR · 11-25-2019, 01:54 AM

Big wheels and tyres will dull the feel and slow response.

What are your alignment specs?

What coilovers and what spwcs?

Will BRZ · 11-25-2019, 01:57 AM

Did you get it aligned when you got those parts installed? What does "custom" coilovers even mean? Take it back and have them inspect everything. Though I doubt it's the problem, check the PSI on the tires as well.

Mr.ac · 11-25-2019, 04:04 AM

If you haven't aligned it, do so.
Also you went from lighter wheels and tires to wider heavy ass wheels and tires, so there's that to slow you down.

DarkPira7e · 11-25-2019, 05:17 AM

That feeling is why I switched from an 18x9 setup back down to 17x7.5. big wheel/tire make this car feel dull

churchx · 11-25-2019, 05:36 AM

Offset is not that much off, scrub radius/steering heaviness should be similar. 255/35/18. Diameter variance is not that different, so acceleration shouldn't be much worse. Wheel weight similar to stock. Tire width within normal range of wheel width. Wheel/tire switch shouldn't change alignment. Who knows the reason

but i bought this car for handling, and experiences like these makes me happy to not have turned to dark side of stance/flushness

That aside, if you mentioned "I got hardrace rear lower control arms and custom coilovers with camber plates." - i slightly guess that you installed these alongside wheel/tire change (for clearance/not rubbing/flushness thingies?). If you mod something in suspension, or even simply unbolt/retighten it's parts - definitely redo alignment. Unlike basic wheel switch, suspension changes will make alignment out of whack, and it can change car handling to wrong one. In this case, i guess that there might be some front toe-in gained or alike. I'd also check if those "custom coilovers" are not dialed too soft.

gpvecchi · 11-25-2019, 05:41 AM

Why people use absurdly wide tires on a 200 hp car?

churchx · 11-25-2019, 05:49 AM

Because that nets placebo impression that it's supercar, one cannot afford?

DarkPira7e · 11-25-2019, 06:06 AM

Quote:

Originally Posted by gpvecchi

Why people use absurdly wide tires on a 200 hp car?

Maybe people who come from owning heavy cars do it out of habit? I got mine because I thought I'd need the grip for being turbo, but I didn't need that much tire. I doubt everyone who has a large wheel/tire setup is 200hp, just the majority.

tobin · 11-25-2019, 06:49 AM

Start by reading How to screw up your cars handling and ride - step by step! by Racecomp Engineering

StraightOuttaCanadaEh · 11-25-2019, 07:35 AM

I have 18x9.5 wheels with sticky tires and my car doesn’t feel like that. That’s odd. What are the coilover specs? Spring stiffness, bump/rebound?

ZDan · 11-25-2019, 07:41 AM

Before/after alignment numbers?
Before you get an alignment, figure out exactly what you want. Generic alignment just gets you within a very wide range...

strat61caster · 11-25-2019, 08:29 AM

+1 on alignment and heavy/wider wheels and tires.

Also check damper settings and experiment there.

TommyW · 11-25-2019, 09:47 AM

Those tires will kill the sensitivity. More than 225 and you really start to feel it

11-25-2019, 01:54 AM	#2
86MLR Senior Member Join Date: Aug 2018 Drives: 2002 VX Commodore SS LS1 Auto Location: Sydney Posts: 2,203 Thanks: 500 Thanked 2,185 Times in 1,111 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Big wheels and tyres will dull the feel and slow response. What are your alignment specs? What coilovers and what spwcs? __________________ Disclaimer: This post represents the official views of the voices in my head at the time of posting. http://www.ft86club.com/forums/showthread.php?t=133311 I'm only here for the biscuits

11-25-2019, 04:04 AM	#4
Mr.ac [insert cool phrase here] Join Date: Aug 2015 Drives: BRZ Premium Location: Central Coast CA Posts: 2,369 Thanks: 709 Thanked 1,558 Times in 930 Posts Mentioned: 30 Post(s) Tagged: 0 Thread(s)	If you haven't aligned it, do so. Also you went from lighter wheels and tires to wider heavy ass wheels and tires, so there's that to slow you down. __________________ New daily driver - Subaru BRZ Premium Weekend fun/track car - '91 MR2 Turbo Gen3 Old daily driver - '88 MR2 Supercharged

11-25-2019, 07:35 AM	#11
StraightOuttaCanadaEh Wes Join Date: Feb 2017 Drives: Artisan Spirits '17 86 Location: Toronto Posts: 2,794 Thanks: 1,165 Thanked 1,674 Times in 994 Posts Mentioned: 21 Post(s) Tagged: 0 Thread(s)	I have 18x9.5 wheels with sticky tires and my car doesn’t feel like that. That’s odd. What are the coilover specs? Spring stiffness, bump/rebound? __________________ Instagram: @gt86ws

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11-25-2019, 01:57 AM	#3
Will BRZ Damn that's crazy... Join Date: Oct 2018 Drives: 2015 BRZ Location: Texas Posts: 971 Thanks: 771 Thanked 772 Times in 467 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Did you get it aligned when you got those parts installed? What does "custom" coilovers even mean? Take it back and have them inspect everything. Though I doubt it's the problem, check the PSI on the tires as well.

11-25-2019, 05:17 AM	#5
DarkPira7e Rust bucket enthusiast Join Date: Feb 2017 Drives: 2013 Turbo Firestorm FRS Location: Vermont Posts: 3,932 Thanks: 3,199 Thanked 4,095 Times in 2,045 Posts Mentioned: 31 Post(s) Tagged: 0 Thread(s)	That feeling is why I switched from an 18x9 setup back down to 17x7.5. big wheel/tire make this car feel dull

11-25-2019, 05:36 AM	#6
churchx Senior Member Join Date: Mar 2015 Drives: 2014 GT86 Location: Latvia, Riga Posts: 4,333 Thanks: 696 Thanked 2,085 Times in 1,436 Posts Mentioned: 53 Post(s) Tagged: 1 Thread(s)	Offset is not that much off, scrub radius/steering heaviness should be similar. 255/35/18. Diameter variance is not that different, so acceleration shouldn't be much worse. Wheel weight similar to stock. Tire width within normal range of wheel width. Wheel/tire switch shouldn't change alignment. Who knows the reason but i bought this car for handling, and experiences like these makes me happy to not have turned to dark side of stance/flushness That aside, if you mentioned "I got hardrace rear lower control arms and custom coilovers with camber plates." - i slightly guess that you installed these alongside wheel/tire change (for clearance/not rubbing/flushness thingies?). If you mod something in suspension, or even simply unbolt/retighten it's parts - definitely redo alignment. Unlike basic wheel switch, suspension changes will make alignment out of whack, and it can change car handling to wrong one. In this case, i guess that there might be some front toe-in gained or alike. I'd also check if those "custom coilovers" are not dialed too soft.

11-25-2019, 05:41 AM	#7
gpvecchi Senior Member Join Date: Mar 2018 Drives: Toyota 86 GT Limited PP (Model G) Location: Italy Posts: 1,018 Thanks: 406 Thanked 335 Times in 187 Posts Mentioned: 14 Post(s) Tagged: 0 Thread(s)	Why people use absurdly wide tires on a 200 hp car?

11-25-2019, 05:49 AM	#8
churchx Senior Member Join Date: Mar 2015 Drives: 2014 GT86 Location: Latvia, Riga Posts: 4,333 Thanks: 696 Thanked 2,085 Times in 1,436 Posts Mentioned: 53 Post(s) Tagged: 1 Thread(s)	Because that nets placebo impression that it's supercar, one cannot afford?

11-25-2019, 06:49 AM	#10
tobin Senior Member Join Date: Jun 2013 Drives: '13 BRZ Location: CT Posts: 485 Thanks: 314 Thanked 330 Times in 155 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	Start by reading How to screw up your cars handling and ride - step by step! by Racecomp Engineering

11-25-2019, 07:41 AM	#12
ZDan Senior Member Join Date: May 2011 Drives: '23 BRZ Location: Providence, RI Posts: 4,584 Thanks: 1,376 Thanked 3,890 Times in 2,032 Posts Mentioned: 85 Post(s) Tagged: 0 Thread(s)	Before/after alignment numbers? Before you get an alignment, figure out exactly what you want. Generic alignment just gets you within a very wide range...

11-25-2019, 09:47 AM	#14
TommyW Senior Member Join Date: Feb 2017 Drives: '13 Whiteout Location: San Clemente Posts: 1,491 Thanks: 496 Thanked 1,242 Times in 673 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Those tires will kill the sensitivity. More than 225 and you really start to feel it

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