Setup Help Please - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

gbgracer · 05-06-2013, 12:07 AM

I'm hoping that my fellow tracksters can give me a bit of good advice!

My goal is to get my FRS to stop murdering the outer edges of my front and rear tires when I do HPDE's...

Current Suspension Setup: Whiteline top hats, Whiteline 16mm 3 way rear sway bar set full stiff(equal to 17mm bar), camber bolts, RCE Yellow springs(stock shocks), Motegi 7.5in rims, Michelin 225/45/17 Super Sports. These changes allowed for -2.3 camber up front and -2.1 in the rear.

I purchased the car for practice between my SCCA races but after just two track days the outer edges of all four tires are gone.

To try and remedy the situation I installed the Whiteline rear bar that I mentioned above after the first track day. The car had a little push and was rolling a lot so I thought the bar would be the fix. It does push less with the bar set full stiff but there is still too much roll which hurt the outer edges of the tires even further on the 2nd track day.

So now I'm wondering if upping the front bar to 20mm from the stock 18mm bar will get rid of the excessive roll, and hopefully not bring back the push as it will keep more of the tire on the tarmac.

What do you all think?

Jeffsu350 · 05-06-2013, 06:31 AM

That's a tire and/or tire pressure issues.

I would first chalk your tires and increase the pressure until the tire isn't rolling over.

If you cannot get that to happen, your tire has too soft of a sidewall and you should get a tire more suited to track days

Ninjin · 05-06-2013, 08:16 AM

Definitely look into a front sway bar. I too was killing my tire shoulders but a combination of 20mm front bar and improved driving (i.e. not trying to be a late-braking hero) has resulted in considerably less wear.

I wouldn't be worried about push, I noticed a decrease in entry and mid-corner understeer after upgrading only the front bar, probably due to more grip from a better contact patch, as you mentioned.

leon78 · 05-06-2013, 08:30 AM

Rear bar is not the direction to go....front bar first and formost on this car.

raul · 05-06-2013, 08:47 AM

Quote:

Originally Posted by Jeffsu350

That's a tire and/or tire pressure issues.

I would first chalk your tires and increase the pressure until the tire isn't rolling over.

If you cannot get that to happen, your tire has too soft of a sidewall and you should get a tire more suited to track days

This.

Quote:

Originally Posted by leon78

Rear bar is not the direction to go....front bar first and formost on this car.

And this.

Racecomp Engineering · 05-06-2013, 09:43 AM

Agreed with the above. Tire pressure can play a big part here and should be step one.

A front bar WILL help too.

- Andy

gbgracer · 05-06-2013, 11:24 AM

For reference sake my tires(Michelin Super Sports) were coming in at 39-40psi hot. Should they be run much hotter than that?

I didn't chalk my tires though...

gbgracer · 05-06-2013, 06:41 PM

Ok, so a 20mm front sway bar will be ordered, but what hot pressure should I look for on the Michelin Super Sports?

05-06-2013, 12:07 AM	#1
gbgracer Member Join Date: Mar 2013 Drives: 2011 STI Location: Dallas Posts: 40 Thanks: 1 Thanked 9 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Setup Help Please I'm hoping that my fellow tracksters can give me a bit of good advice! My goal is to get my FRS to stop murdering the outer edges of my front and rear tires when I do HPDE's... Current Suspension Setup: Whiteline top hats, Whiteline 16mm 3 way rear sway bar set full stiff(equal to 17mm bar), camber bolts, RCE Yellow springs(stock shocks), Motegi 7.5in rims, Michelin 225/45/17 Super Sports. These changes allowed for -2.3 camber up front and -2.1 in the rear. I purchased the car for practice between my SCCA races but after just two track days the outer edges of all four tires are gone. To try and remedy the situation I installed the Whiteline rear bar that I mentioned above after the first track day. The car had a little push and was rolling a lot so I thought the bar would be the fix. It does push less with the bar set full stiff but there is still too much roll which hurt the outer edges of the tires even further on the 2nd track day. So now I'm wondering if upping the front bar to 20mm from the stock 18mm bar will get rid of the excessive roll, and hopefully not bring back the push as it will keep more of the tire on the tarmac. What do you all think?

05-06-2013, 08:30 AM	#4
leon78 Senior Member Join Date: Jan 2013 Drives: 13 Whiteout Location: Niceville FL Posts: 666 Thanks: 307 Thanked 241 Times in 142 Posts Mentioned: 23 Post(s) Tagged: 1 Thread(s)	Rear bar is not the direction to go....front bar first and formost on this car. __________________ 2013 Scion FR-S (Whiteout) GunMetal 16x8+25 Enkei CompE_Cusco OCC_ Kartboy Crank Pulley_Kartboy TMM insert_Koni Yellows_RCE Springs_K&N Drop-In_Eibach FSB_J2 Catless FP_WhiteLine Camber Bolts_NameLess Track Pipe_RBF600_Ferodo DS2500_PTUNING Tuned. Less parking more racing

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05-06-2013, 06:31 AM	#2
Jeffsu350 Senior Member Join Date: Aug 2012 Drives: Frs Location: Dc Posts: 106 Thanks: 9 Thanked 53 Times in 20 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	That's a tire and/or tire pressure issues. I would first chalk your tires and increase the pressure until the tire isn't rolling over. If you cannot get that to happen, your tire has too soft of a sidewall and you should get a tire more suited to track days

05-06-2013, 08:16 AM	#3
Ninjin Senior Member Join Date: Jun 2012 Drives: SWP BRZ 6MT Location: Phoenix, AZ Posts: 876 Thanks: 415 Thanked 576 Times in 332 Posts Mentioned: 144 Post(s) Tagged: 0 Thread(s)	Definitely look into a front sway bar. I too was killing my tire shoulders but a combination of 20mm front bar and improved driving (i.e. not trying to be a late-braking hero) has resulted in considerably less wear. I wouldn't be worried about push, I noticed a decrease in entry and mid-corner understeer after upgrading only the front bar, probably due to more grip from a better contact patch, as you mentioned.

05-06-2013, 09:43 AM	#6
Racecomp Engineering Join Date: Nov 2011 Drives: 2016 BRZ, 2012 Paris Di2 & 2018 STI Location: Severn, MD Posts: 5,408 Thanks: 3,420 Thanked 7,242 Times in 2,963 Posts Mentioned: 303 Post(s) Tagged: 9 Thread(s)	Agreed with the above. Tire pressure can play a big part here and should be step one. A front bar WILL help too. - Andy

05-06-2013, 11:24 AM	#7
gbgracer Member Join Date: Mar 2013 Drives: 2011 STI Location: Dallas Posts: 40 Thanks: 1 Thanked 9 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	For reference sake my tires(Michelin Super Sports) were coming in at 39-40psi hot. Should they be run much hotter than that? I didn't chalk my tires though...

05-06-2013, 06:41 PM	#8
gbgracer Member Join Date: Mar 2013 Drives: 2011 STI Location: Dallas Posts: 40 Thanks: 1 Thanked 9 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Ok, so a 20mm front sway bar will be ordered, but what hot pressure should I look for on the Michelin Super Sports?

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