Turbo Suspension - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Strife26 · 04-18-2018, 05:51 PM

So I finally boosted my BRZ. The turbo spools fairly quickly (I think) around 3500-4000.

I have 18x9.5 all around and some (probably terrible tires). I assume tires are gonna be a big part of it, but I was wondering if anyone can offer some suggestions on how to add some grip and stability to the car now that it is turboed.

So far I have:
Exhaust (Ultimate Racing
Headers (Gruppe-S)
Turbo kit (Ultimate Racing)
18x9.5 (Miro 111)
Coilovers (Tein Street Basis Z- starters for now)
Shift Bushing (whiteline)
Short throw (Top Speed)
Master Brake Cylinder (Radium)
Oil Catch Can (Mishimoto)
Other small upgrades that don't pertain to suspension

I was looking at sway bars, but never made the purchase.

Basically, is there anything I can upgrade to help maintain the balance of the car now that it is boosted? I don't know enough about suspension even after reading up on it quite a bit (Damn cars and unlimited knowledge). I assume the biggest thing to do is get some real tires on their first, but hoping to make the car just as good as it is without turbo power.

Mr.ac · 04-18-2018, 11:14 PM

Answered your own question.
Tires. Get sticker ones

What size do you have on now? Please don't tell me is smaller than a 235.

StraightOuttaCanadaEh · 04-19-2018, 10:51 AM

tire pressures are also important. My tires were squirrelly as hell when they were up to 36 psi. Lowered them to 32 and the grip improved. Experiment

venturaII · 04-19-2018, 11:01 AM

Play with tire pressure, get a better alignment, buy stickier tires.

tyler_win_photo · 04-19-2018, 03:01 PM

Stickier tires.

Camber bolts or camber plates for front camber adjustment.

Rear LCA to adjust camber.

Hold off on the sway bars unless you know what they do and how it pairs with tire compound. People sometimes go too stiff and overwork the tires resulting in less grip overall.

strat61caster · 04-19-2018, 04:31 PM

Tires + alignment
Get some toe-in on the rear, minimum 1/8" (~0.3 degrees) total imho
I've got more on my car and a whole lot less power

Ride heights and crossweight could be playing a factor too along with damper settings and tire pressures and sway bars. There's no reason that with good tires you can't have a setup that's stable.

Turdinator · 04-19-2018, 09:54 PM

Tyres and an alignment are a great place to start. If traction is an issue you can see if softening the damping on your rear shocks help. I don't have experience Tiens tho so its something you will have to have a play with.

Strife26 · 04-20-2018, 02:42 AM

Thanks all for the responses. I will try all of these and wait on the sway bars.

EAGLE5 · 04-20-2018, 03:11 AM

People choose to have toe-in on their cars? SMH.

churchx · 04-20-2018, 06:15 AM

jsimon7777: many on rwd cars dial in slight toe-in for a bit more stability. Heck, even stock alignment is:
Toe (Each Wheel): C + D: 0°10' +/- 0°15' (0.16° +/- 0.24°)
Toe (Total): 2.0 +/- 3.0 mm(0.0787 +/- 0.1181 in.)
Imho nice article.

cjd · 04-20-2018, 10:09 AM

Quote:

Originally Posted by jsimon7777

People choose to have toe-in on their cars? SMH.

Rear? Yes. Makes the car less skittish under power and can result in faster lap times. At least, done right.

venturaII · 04-20-2018, 11:35 AM

Quote:

Originally Posted by cjd

Rear? Yes. Makes the car less skittish under power and can result in faster lap times. At least, done right.

In most cases, 'done right' means 'virtually none', if you don't want to numb up response. I think zero is the ideal number to shoot for, personally, if you're concerned with keeping a lively feeling setup and still have decent tracking.

strat61caster · 04-20-2018, 01:13 PM

Quote:

Originally Posted by jsimon7777

People choose to have toe-in on their cars? SMH.

Incredible as it may seem, some people don't place high value on tire longevity.

cjd · 04-20-2018, 02:21 PM

Quote:

Originally Posted by venturaII

In most cases, 'done right' means 'virtually none', if you don't want to numb up response. I think zero is the ideal number to shoot for, personally, if you're concerned with keeping a lively feeling setup and still have decent tracking.

I run what probably amounts to zero toe with a toe-in bias in the rear, but will be experimenting again this year with more. However, I autocross - and setup requirements are different than what might be fastest on a traditional race course. Ultimately fastest may be zero toe, but I'd guess that a little toe-in will be more consistent for drivers that aren't perfect - and that's most of us; certainly is me. I forget what happens to toe under compression, but that also plays a role.

Also, for street, I'd nearly always recommend a touch of rear toe-in.

And absolutely not toe-out in the rear.

04-18-2018, 05:51 PM	#1
Strife26 Senior Member Join Date: Sep 2014 Drives: 2015 Subaru BRZ Series.blue Location: Redding, CA Posts: 651 Thanks: 1,076 Thanked 150 Times in 115 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Turbo Suspension So I finally boosted my BRZ. The turbo spools fairly quickly (I think) around 3500-4000. I have 18x9.5 all around and some (probably terrible tires). I assume tires are gonna be a big part of it, but I was wondering if anyone can offer some suggestions on how to add some grip and stability to the car now that it is turboed. So far I have: Exhaust (Ultimate Racing Headers (Gruppe-S) Turbo kit (Ultimate Racing) 18x9.5 (Miro 111) Coilovers (Tein Street Basis Z- starters for now) Shift Bushing (whiteline) Short throw (Top Speed) Master Brake Cylinder (Radium) Oil Catch Can (Mishimoto) Other small upgrades that don't pertain to suspension I was looking at sway bars, but never made the purchase. Basically, is there anything I can upgrade to help maintain the balance of the car now that it is boosted? I don't know enough about suspension even after reading up on it quite a bit (Damn cars and unlimited knowledge). I assume the biggest thing to do is get some real tires on their first, but hoping to make the car just as good as it is without turbo power. __________________ Please only adult answers. I'm stupid, retarded, a fkn idiot, and I will kill myself after a couple answers, I already know this (thanks to the interwebs and its logic) so feel free to leave those responses out, thanks.

04-18-2018, 11:14 PM	#2
Mr.ac [insert cool phrase here] Join Date: Aug 2015 Drives: BRZ Premium Location: Central Coast CA Posts: 2,368 Thanks: 709 Thanked 1,559 Times in 930 Posts Mentioned: 30 Post(s) Tagged: 0 Thread(s)	Answered your own question. Tires. Get sticker ones What size do you have on now? Please don't tell me is smaller than a 235. __________________ New daily driver - Subaru BRZ Premium Weekend fun/track car - '91 MR2 Turbo Gen3 Old daily driver - '88 MR2 Supercharged

04-19-2018, 10:51 AM	#3
StraightOuttaCanadaEh Wes Join Date: Feb 2017 Drives: Artisan Spirits '17 86 Location: Toronto Posts: 2,871 Thanks: 1,255 Thanked 1,734 Times in 1,025 Posts Mentioned: 21 Post(s) Tagged: 0 Thread(s)	tire pressures are also important. My tires were squirrelly as hell when they were up to 36 psi. Lowered them to 32 and the grip improved. Experiment __________________ Instagram: @gt86ws

04-19-2018, 11:01 AM	#4
venturaII Only users lose drugs. Join Date: Nov 2014 Drives: All the time Location: Shrewsbury upon Worcestershire Posts: 1,834 Thanks: 888 Thanked 1,078 Times in 681 Posts Mentioned: 3 Post(s) Tagged: 2 Thread(s)	Play with tire pressure, get a better alignment, buy stickier tires. __________________ "To know a thing well, know it's limits. Only when pushed beyond its tolerances will true nature be seen." Amtal Rule

04-19-2018, 03:01 PM	#5
tyler_win_photo Senior Member Join Date: Dec 2013 Drives: 2014 Scion FRS (Asphalt) Location: Redmond, WA Posts: 559 Thanks: 39 Thanked 173 Times in 143 Posts Mentioned: 6 Post(s) Tagged: 2 Thread(s)	Stickier tires. Camber bolts or camber plates for front camber adjustment. Rear LCA to adjust camber. Hold off on the sway bars unless you know what they do and how it pairs with tire compound. People sometimes go too stiff and overwork the tires resulting in less grip overall. __________________ AVO Stage 2 Turbo Build Thread https://wheelwell.com/tyler-nguyen-1...014-scion-fr-s

04-20-2018, 02:42 AM	#8
Strife26 Senior Member Join Date: Sep 2014 Drives: 2015 Subaru BRZ Series.blue Location: Redding, CA Posts: 651 Thanks: 1,076 Thanked 150 Times in 115 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Thanks all for the responses. I will try all of these and wait on the sway bars. __________________ Please only adult answers. I'm stupid, retarded, a fkn idiot, and I will kill myself after a couple answers, I already know this (thanks to the interwebs and its logic) so feel free to leave those responses out, thanks.

04-20-2018, 06:15 AM	#10
churchx Senior Member Join Date: Mar 2015 Drives: 2014 GT86 Location: Latvia, Riga Posts: 4,335 Thanks: 698 Thanked 2,086 Times in 1,436 Posts Mentioned: 53 Post(s) Tagged: 1 Thread(s)	jsimon7777: many on rwd cars dial in slight toe-in for a bit more stability. Heck, even stock alignment is: Toe (Each Wheel): C + D: 0°10' +/- 0°15' (0.16° +/- 0.24°) Toe (Total): 2.0 +/- 3.0 mm(0.0787 +/- 0.1181 in.) Imho nice article.

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