Race Tracking Your Supra - Information exchange

[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

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[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.

 

[garudathree]

tbc am not commenting on your setup, just providing supporting evidence on my note for why there is/isn't additional front stiffness on the initial launch/gt4.

 

[Rocksandblues]

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






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

A factory race car and a designed street car are dramatically different

I have driven a m2csr AND a m4 gt4 on track. They drive and handle PERFECT. The adjustments are to suit conditions or a specific track. The settingget changed all the time

my street Supra is on max stiff to try and catch up to them a bit

I concede I am not arguing with you -same team- feeling here. I don’t buy they added braces to satisfy car reviewers

 

[garudathree]

If you just added front braces on ‘20 model Supra, it wouldn’t work as it should. When a driver would turn-in, it would understeer. During the exit, it would oversteer. You can’t just stiffen up the chassis. We needed to think of both front and rear balance. With this update, we readjusted all those things.

- tada probably

 

[razorlab]

my street Supra is on max stiff to try and catch up to them a bit

When you state "Max stiff" what do you technically mean by that?

 

[Rocksandblues]

When you state "Max stiff" what do you technically mean by that?

stiffer springs than people suggest and front and sway sways both on max
I slide through some corners when doing a time trial or hot lap and have to counter steer power on.

 

[razorlab]

stiffer springs than people suggest and front and sway sways both on max
I slide through some corners when doing a time trial or hot lap and have to counter steer power on.

What spring rates are you using?

Sliding is usually slower than gripping.

 

[Rocksandblues]

Sitting on a beach. Will look at my notes.
Usually- but not always . Lots of styles, lots of set ups. My lap times speak for them selves and only running at 440 hp

Concede there is always someone faster and always a better way. Works for me so far. Within a.5 sec to max2 track records on the 4 tracks I do scca tt. Everyone says real coil overs drop time- I am excited to do that next.

 

[razorlab]

Sitting on a beach. Will look at my notes.
Usually- but not always . Lots of styles, lots of set ups. My lap times speak for them selves and only running at 440 hp

Concede there is always someone faster and always a better way. Works for me so far. Within a.5 sec to max2 track records on the 4 tracks I do scca tt. Everyone says real coil overs drop time- I am excited to do that next.

OH, sorry if I came off as critical. Not my intent at all. Was just making a broad statement.

I thought you where on stock struts still. Can't be that stiff then?

 

[Rocksandblues]

OH, sorry if I came off as critical. Not my intent at all. Was just making a broad statement.

I thought you where on stock struts still. Can't be that stiff then?

No no. I didn’t and don’t take offense. I struggle w intent and emoting my social media posts . But I am super chill and hard to offend
Yes on third set of oem struts

 

[kaj]

No no. I didn’t and don’t take offense. I struggle w intent and emoting my social media posts . But I am super chill and hard to offend
Yes on third set of oem struts

So, lowering springs and sway bars? Or does someone make a standard spring for OEM struts that is more stiff?

 

[type-964]

What do you all use to air up at the track?

I’m considering buying a compressor but don’t want one that sucks.

Also, any suggestions for starting tire pressure for PS4S on track?

 

[Joker328]

Relevant video with respect to set up and oversteer/understeer being down to driver preference:

It's true even at the highest levels of motorsport. Both can be fast.

My limited understanding is that if the car is oversteering, increasing front axle roll stiffness should increase overall grip and responsiveness up to a point, but it also means the outside tire on the front axle is doing more of the work and will be overloaded sooner.

I think the issue a lot of people run into is that the aftermarket front sway bars are very stiff compared to stock and designed to be run with an equally stiff aftermarket rear sway bar. So if you just do the front, you could still in theory be quicker, but if you don't adjust your driving style to account for what may now be an understeer bias, you are just going to overheat your front tires, which will of course make you slower. If I were only going to do the front, I would look for the softest sway bar on the softest setting (which would still probably be noticeably stiffer than stock).

 

[Rensuhlo]

Finally in a position to buy some 18 squared wheels now that the advans are sold.

T7/Apex are the two that offer a 18x10 squared setup for stock suspension, right?

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