Race Tracking Your Supra - Information exchange

[razorlab]

That Vette is a dick face driver. Video quality is fantastic though

Hahah. He actually pointed me by quick enough, most people do not in that corner. Sure my PB would have been lower, but that is HPDE championship life.

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[Rmak]

I just started playing with sim and had the same thought. Currently have my brake set to 30 kg but think maybe a little lighter 25ish is more similar to the real car. Although I have the Essex AP racing kit so it's a little more firm than stock. Wish it was firmer in real life as well.

Hi guys I have an interesting request.

I’m trying to figure out how much actual pedal force (in kg or lbs) it takes to reach full braking in the A90 Supra — as in, hitting 100% brake pressure or triggering ABS with the brake booster active.


I'm tuning my sim rig and currently have my load cell brake pedal set up to require 46 kg (101 lbs) of pressure to reach full braking input. But I realized that’s probably simulating a non-boosted system, which isn’t accurate to what the real Supra feels like.


Since the A90 uses an electro-hydraulic brake booster (BMW’s iBooster), I’m assuming the actual pedal force needed in the real car is lower maybe around 28–32 kg? But I haven’t been able to find any hard numbers, and unfortunately I don't have capability to tap into canbus to log brake pressure data.


Has anyone measured this or have a good estimate of:

How much force a driver actually applies to the pedal at full braking?
Whether 46 kg is overkill for simulating the Supra?
Any real-world data from track use or telemetry setups?

Would love to get as close as possible to the real pedal feel. Thanks in advance for any insight!

 

[i3igpete]

I just started playing

whoa whoa whoa you can't waltz in here with that neat reverse swan (goose-neck ?) wing mount and not show us more pictures

 

[Rmak]

I don't have any good pics but will get some.

It's a prototype and I am no master fabricator so don't look too close or you'll see all my back yard hackery. First dry day shake down was yesterday and it stayed attached to the chassis so next will by making or perhaps buying a carbon wing to replace the aluminum one that weighs ~20 lb.

whoa whoa whoa you can't waltz in here with that neat reverse swan (goose-neck ?) wing mount and not show us more pictures

 

[i3igpete]

I spy with my little eye... a winglogic sticker?

 

[Rmak]

Yessir!

Works great and especially for the price and nice people to deal with. I'm just not keen on having that weight sitting that high up

Stole the chassis mount location for HKS. Funnily enough I met a guy yesterday at the track who built a similar wing but MUCH more professional and refined. Also much faster than me

I spy with my little eye... a winglogic sticker?

 

[i3igpete]

I'm gonna guess... Jared at Sector1?

 

[Rmak]

That's him. His car is F1 level perfectionism

I'm gonna guess... Jared at Sector1?

 

[Funkjaw]

Hi guys I have an interesting request.

I’m trying to figure out how much actual pedal force (in kg or lbs) it takes to reach full braking in the A90 Supra — as in, hitting 100% brake pressure or triggering ABS with the brake booster active.


I'm tuning my sim rig and currently have my load cell brake pedal set up to require 46 kg (101 lbs) of pressure to reach full braking input. But I realized that’s probably simulating a non-boosted system, which isn’t accurate to what the real Supra feels like.


Since the A90 uses an electro-hydraulic brake booster (BMW’s iBooster), I’m assuming the actual pedal force needed in the real car is lower maybe around 28–32 kg? But I haven’t been able to find any hard numbers, and unfortunately I don't have capability to tap into canbus to log brake pressure data.


Has anyone measured this or have a good estimate of:

How much force a driver actually applies to the pedal at full braking?
Whether 46 kg is overkill for simulating the Supra?
Any real-world data from track use or telemetry setups?

Would love to get as close as possible to the real pedal feel. Thanks in advance for any insight!

Unsure but would something like this be helpful?

https://www.amazon.com/Mxmoonfree-D..._1_4?c=ts&s=industrial&sr=1-4&ts_id=401582011

 

[FLtrackdays]

I’ve got a set of Project Mu Club Racers waiting to go on, so I’m hoping those help a lot once they’re on Before this, I was deep into sim racing and ran 65kg on my load cell pedals, so I got used to needing real pressure to slow the car down. Translating that feel into real life has been tough.

Anyone else run into the same issue or find a good way to get a more solid pedal feel in the Supra?

side note: seems like I will probably have to do a rotor change with project mu CR based off comments here. My rotors are still pretty clean from stock pads anyone have experience with this?

My most solid pedal feel is after fresh fluid or bleeding out the dirty fluid. So I do that after each track weekend. Most will call it overkill but it‘s easy to do. Maybe it’s a Florida thing, who knows. Regardless, they start to get mushy whenever I don‘t do it. Especially after a full 3 days of tracking.

If you notice a more solid pedal with brand new track pads & they get worse as the pad gets thinner, then it may be time to check your calipers for cracked or totally eroded seals. I had that happen in one of my track cars and the problem went away after a rebuild. The fronts get the most heat & were eroding, so we rebuilt mine recently to make sure it doesn’t happen or even worse, seize & fail. The latter being unlikely but we did it nonetheless.

 

[Gabe]

My most solid pedal feel is after fresh fluid or bleeding out the dirty fluid. So I do that after each track weekend. Most will call it overkill but it‘s easy to do. Maybe it’s a Florida thing, who knows. Regardless, they start to get mushy whenever I don‘t do it. Especially after a full 3 days of tracking.

Do you DIY that or take it to a shop. What about the ABS? I was told it needs some computer magic to make it happen

 

[Levophed]

Do you DIY that or take it to a shop. What about the ABS? I was told it needs some computer magic to make it happen

You need ISTA to do a full ABS bleed. You can do it yourself though for just routine.

 

[FLtrackdays]

Do you DIY that or take it to a shop. What about the ABS? I was told it needs some computer magic to make it happen

Used to do it myself & change the pads & rotors. But I don’t track nearly enough to do so. Plus, she’s usually at the shop in between track days for something I bought or broke ?. Both shops do it for me now really cheap.

As far the ABS magic, after hearing so much about it on here, I asked them if they’ve every had to flush the ABS module on mine. Both said nope and asked me why (afraid I did something lol). Unless I got air in the system (such as letting the reservoir go dry), or if I hadn’t changed the fluid in a really long time, or if I constantly was hitting the ABS, it’s not something they‘d do in my case. Hence I’ve never had to do it and hopefully you‘ll never need to as well.

 

[Vegas17]

That's him. His car is F1 level perfectionism

Wow, looked this car up and this link/build page is great.
https://sectoronedesign.wordpress.com/category/supra/

 

[RedMKV]

My most solid pedal feel is after fresh fluid or bleeding out the dirty fluid. So I do that after each track weekend. Most will call it overkill but it‘s easy to do. Maybe it’s a Florida thing, who knows. Regardless, they start to get mushy whenever I don‘t do it. Especially after a full 3 days of tracking.

Which fluid are you using? When I switched to SRF it lasted much linger

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