Race Tracking Your Supra - Information exchange

[Todday1]

So another track topic. Has anyone experienced excessive left rear brake pad wear. I think I know why but am interested in what others have experienced.

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[razorlab]

So another track topic. Has anyone experienced excessive left rear brake pad wear. I think I know why but am interested in what others have experienced.

I have not over twenty track days. In fact, I am still on the same rear pads after twenty events which is outstanding to me. I do run a square friction setup, which is a little different than others I believe.

What I do experience is pad drag on left turns on the right front. It's by wear. If I take the pads out and switch rotor sides on the same corner, the noise goes away for awhile. It seems to happen more often on tighter more loaded up corners. Right turns I experience no sound.

 

[Todday1]

Ok thanks for jumping in. Do you run with traction control fully off by holding down the button?

 

[RichSC]

So another track topic. Has anyone experienced excessive left rear brake pad wear. I think I know why but am interested in what others have experienced.

Can't say I've experienced this either, or anything weird with the brakes really. CSG pads on all corners and electronics all off.

 

[razorlab]

Ok thanks for jumping in. Do you run with traction control fully off by holding down the button?

I run with one click off. So not fully off. I also log brake pressure per wheel so I can see when it's brake vectoring. I do see 2% pressure in some corners when I am not physically on the brakes. 2% to me doesn't seem like actual brake vectoring though. Maybe it's preloading the system?

You can see the 2% overall system pressure happening in this video here:

 

[Todday1]

Interesting. So I have went through a lot of pads rotors and even swapped out to big Brakes Granted I am in tt3 so are definitely using brakes pretty hard. Would normally get 6 to 7 track days out of pads.

 

[Todday1]

So I think razorlab us on to something. I too did one click for many events as I did not know how to hold it down until Vsa off comes on. So if you are getting to the edge of tires then you feel the traction control kicking in and some indicators on dash.

 

[RichSC]

So I think razorlab us on to something. I too did one click for many events as I did not know how to hold it down until Vsa off comes on. So if you are getting to the edge of tires then you feel the traction control kicking in and some indicators on dash.

Definitely, it's too intrusive.

 

[Todday1]

So here is what I think is happening once you get to hpde4 or TT speed levels. The left rear is where the traction control actuates the pads. So if you see it coming on it will use the left rear fir the stability control correction and smoke those pads faster. Especially on the inside one which is harder to see so be on the look out. I suggest taking iff all the way and you brake pads will like you for it.

 

[razorlab]

I don't find it intrusive one click off. I'm in advanced group and I have 20+ years of experience and don't drive like an ape. Now, traction control fully on is way too intrusive.

I also took a look through some of my data. In this instance, it's actually actuating the front brakes, not the rears at all.

This screenshot I am mid corner, 1.28G, I have the steering wheel at 50% lock. "brake" is the amount the brake system is requesting in %. "brakef" is line pressure for the front brakes. "braker" is line pressure for the rear brakes. You can see what I feel is the system preloading at 2% request, and 15 psi pressure to the front. For reference, when I am threshold braking, it's around 46% request, 1250psi front/980psi rear.

Note, the wheel speed differences at the rear and front right, in addition to the yaw, show you what is about to happen...

This screenshot is moments later where I am saving a slide, I counter steer as you can see in the data, and it also looks like the traction system intervenes a little bit more at 4% request, 64psi brake pressure on the front, still none to the rear.

 

[Todday1]

Good stuff that is exactly what I was try to say but I did not have all that data. Just seat data. So taking it off is the way to go. Plus forces you to be smoother on and off the gas and then makes you better driver.

 

[razorlab]

Good stuff that is exactly what I was try to say but I did not have all that data. Just seat data. So taking it off is the way to go. Plus forces you to be smoother on and off the gas and then makes you better driver.

Sure, if you are starting out as a driver. Although there is a good argument there for keeping it all on.

I happen to find the car plenty fast with just one click off and I like having that safety net. Maybe it's because I have the years of experience of not driving like an ape.

 

[B58_ hwAyaq]

Recommended track alignment specs for a stock suspension car?

 

[Todday1]

I will give it a try. So stock camber is limited to what ever small adjustments can be made front and rear if any. So if you can get to -1.5 front and -1.2 rear. With 0 tow in front and 1/32 total tow in in rear would be good. But if you do a lot of track days you will have to get camber plates and or adjustable arms to get even more camber otherwise you will cord the outside of the tires. Basically get to the highest camber per stock limitations .

 

[romanLegion9574]

Lakewood, Washington (an hour south of Seattle) The Ridge is my home track. https://www.ridgemotorsportspark.com/

Hopefully I see you out there. I head out there 2-3 times a year.

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