Race Tracking Your Supra - Information exchange

[Rocksandblues]

If you are going for a firmer ride and less roll do both. .02

Sponsored

 

[Rta95]

Appreciate all the feedback. I'll go with both. And gotta ask too, anyone order from here before? Just wanted to make sure it was legit. Ordering car parts on Amazon makes me apprehensive lol. Eibach E40-82-089-01-11 Anti-Roll-Kit (Front And Rear Sway Bars) 2020 to 2021 TOYOTA GR Supra https://a.co/d/5JiLpYw

 

[razorlab]

Do both front & rear sway bar. when I had just front cusco sway bar, I felt like chasis was bending because rear was giving in while front is not.

Wut. I guess I don't feel that on the dishonest tracks I go to.

 

[racebuild]

Appreciate all the feedback. I'll go with both. And gotta ask too, anyone order from here before? Just wanted to make sure it was legit. Ordering car parts on Amazon makes me apprehensive lol. Eibach E40-82-089-01-11 Anti-Roll-Kit (Front And Rear Sway Bars) 2020 to 2021 TOYOTA GR Supra https://a.co/d/5JiLpYw

Whiteline offers a sway package with front & rear sway links, that allows you to dial out any preload on the sway bar. Car will need to be on a 4post lift or race stands to properly adjust them.

 

[Eyelise]

Appreciate all the feedback. I'll go with both. And gotta ask too, anyone order from here before? Just wanted to make sure it was legit. Ordering car parts on Amazon makes me apprehensive lol. Eibach E40-82-089-01-11 Anti-Roll-Kit (Front And Rear Sway Bars) 2020 to 2021 TOYOTA GR Supra https://a.co/d/5JiLpYw

I posted on this as well as Razorlab. Front sway bar alone (Eibach on the middle setting) eliminated all body roll on the street and most of my body roll on the track. The car in my hands, stock tires and suspension will slide and power oversteer but little understeer. I have the rear Eibach bar but I'm waiting until after I install my camber plates and upgrade my tires to super 200TW to even see if I need it. Just buy the front maybe I sell you my rear for a discount.

 

[kaj]

So what am I doing wrong that I'm not getting understeer with stock suspension? Well, I did once my tires were done, but the car felt well balanced up to that point. I'm not finding any overwhelming need to change anything to make the car more drivable.
I do have a knack for feeling comfortable in most cars I drive even if they aren't the greatest... But the car is putting down really good lap times.

 

[garudathree]

toyota only added the front strut brace to the ‘21s because auto journalists couldn’t drive the initial launch setup well without it. iirc the pro racers who track tested it were faster without the brace, hence the decision to launch without it. you get the same effect with a stiffer front sway bar, these are all just timing devices for which of the axles lose traction first. it’s why even the gt4/evo aren’t running the brace either.

 

[Eyelise]

I find it strange the a strut tower brace could have that much affect on handling. Certainly once you are at the GT4 lvl with huge mech and aero but short of that ? The chassis is a pretty darn stiff one. Now sway bars do have a huge impact.

 

[Rta95]

I posted on this as well as Razorlab. Front sway bar alone (Eibach on the middle setting) eliminated all body roll on the street and most of my body roll on the track. The car in my hands, stock tires and suspension will slide and power oversteer but little understeer. I have the rear Eibach bar but I'm waiting until after I install my camber plates and upgrade my tires to super 200TW to even see if I need it. Just buy the front maybe I sell you my rear for a discount.

I appreciate the offer. I already bought both haha, so will see how it goes. For now I was thinking of keeping both at the softest setting and maybe make the front stiffer later if needed. That seems to be what a lot of people are having better performance with, the front a notch stiffer than the rear.

 

[Rocksandblues]

toyota only added the front strut brace to the ‘21s because auto journalists couldn’t drive the initial launch setup well without it. iirc the pro racers who track tested it were faster without the brace, hence the decision to launch without it. you get the same effect with a stiffer front sway bar, these are all just timing devices for which of the axles lose traction first. it’s why even the gt4/evo aren’t running the brace either.

Not because of journalists. Legit effort to add rigidity and fight corner pull down

Gt4 cars need access to engine during and between races. They have ever MORE rigidity due to integrated roll cages.
never heard of a race team making their chassis more flexible. Why do you think the engine and trans mounts are solid.
If they want a more compliant ride they adj suspension. Not chassis

respectfully

 

[razorlab]

Gt4 cars need access to engine during and between races.

The F series and G series BMW M4 GT4's would like to have a word with you...

 

[Rocksandblues]

Current bmw gt4 strut braces is beautifully carved out of the way. They serve a purpose but repair speed during race weekend is important too. Watched a gt4 team friends replace a radiator couple weeks ago between races.

an off in traffic collected some gravel. The belt and fan threw a rock through the radiator 2 laps later

 

[razorlab]

Current bmw gt4 strut braces is beautifully carved out of the way. They serve a purpose but repair speed during race weekend is important too. Watched a gt4 team friends replace a radiator couple weeks ago between races.

an off in traffic collected some gravel. The belt and fan threw a rock through the radiator 2 laps later

The top photo is the current BMW M4 GT4. They span the whole engine bay.

Technically the supra braces aren't in the way of the radiator either.

 

[garudathree]

you're probably right, i don't know much about motorsports honestly, just read a bunch:
from popular mechanics:

Likewise, they’d rather not have you start drilling holes everywhere. So, for instance, there are already threaded holes in place for strut tower braces—on the passenger side, the airbox even has an indentation for the brace. But why is there no strut tower brace in the first place? Because the car is so stiff already that the extra buttressing actually makes it too stiff for the dynamic preferences of Herwig Daenens, aka “Master Driver,” the Dutch race driver responsible for the Supra’s sweet handling.

Herwig Daenens is a Toyota development and race driver. He has a 24 Hours of Nürburgring podium under his belt, so you know he’s legit. He did the chassis development on the GR Supra, and the first words out of his mouth to me were, “I hate understeer.”

it's one of the few areas i politely disagree with Mario on:
https://occamsracers.com/2023/07/14/understeer-is-faster-than-oversteer/

note the gt4’s front bar setting

 

[Rocksandblues]

I am certainly not a master wrench. My race team friends set up my car. I have had real race car drivers drive my car with glowing comments. It is set up very stiff. Very rotate-y. There are different driving styles and very different skill levels

I am not putting anyone down

less than 1% of any Supra purchaser will drive the car at or above its stock limits. It is designed to fit the skill level of ave drivers that rarely track and to be safe- oversteer- and compliant on the track.

lots of different ways to “skin the cat”

they did an amazing job designing the Supra stock handling. There is always someone better and faster
My set up takes advantage of my style and skill. Stiff.

Sponsored