Strange braking behavior in high speed curves

[Thatpartsguy]

I recently got an alignment and after I have noticed when lifting off in a corner the car will start pulsing the front brakes as if its trying to save itself from a slide. I wouldn't think there is a reason for it to activate VSC as the car wasn't unsettled until it started phantom braking and then it gets squirrely and scary. Any input is greatly appreciated I just want to get my car back to not trying to kill me! View attachment ALIGNMENT SUPRA.pdf

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[Rensuhlo]

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[Thatpartsguy]

So people dont have to download a pdf

Thank you I"m a moron!

 

[DeeTee (Scammer)]

I recently got an alignment and after I have noticed when lifting off in a corner the car will start pulsing the front brakes as if its trying to save itself from a slide. I wouldn't think there is a reason for it to activate VSC as the car wasn't unsettled until it started phantom braking and then it gets squirrely and scary. Any input is greatly appreciated I just want to get my car back to not trying to kill me! View attachment ALIGNMENT SUPRA.pdf

Your steering angle sensor (SAS) is likely out of calibration. When an alignment changes the thrust angle or wheel geometry, the SAS can lose its "zero-point," causing the VSC to panic and trigger phantom braking when the car is cornering off-center.

 

[Thatpartsguy]

Your steering angle sensor (SAS) is likely out of calibration. When an alignment changes the thrust angle or wheel geometry, the SAS can lose its "zero-point," causing the VSC to panic and trigger phantom braking when the car is cornering off-center.

We did do an sas reset and it is still present. Should we do another just to be safe?

 

[exe36m3]

I never really liked the factory alignment setting, which was more toe in front... so the wheels point in like this / \. This kills the turn-in responses, slows the front end down, and forces the car to oversteer/rear end kicks out.

My theory, with this "snow-plow" of an alignment up front is what is messing your stability at higher speeds.

Try .05 toe up front (which straightens out the front wheels - more speed, good high speed stability)and .10 to .13 in the rear (.10 is more neutral, but stable, 13 sticks the rear to the ground).

This should stabilize the front end on high speeds, give you more responsiveness and makes the rear-end less wandering on throttle inputs.

And harass the tech to match the numbers left and right!

 

[Thatpartsguy]

I never really liked the factory alignment setting, which was more toe in front... so the wheels point in like this / \. This kills the turn-in responses, slows the front end down, and forces the car to oversteer/rear end kicks out.

My theory, with this "snow-plow" of an alignment up front is what is messing your stability at higher speeds.

Try .05 toe up front (which straightens out the front wheels - more speed, good high speed stability)and .10 to .13 in the rear (.10 is more neutral, but stable, 13 sticks the rear to the ground).

This should stabilize the front end on high speeds, give you more responsiveness and makes the rear-end less wandering on throttle inputs.

And harass the tech to match the numbers left and right!

Ok will do, thank you for your input! Do you think its possible what I am experiencing is bump steer?

I noticed today with vsc off the brakes dont intervene but I get strange chassis oscillations once the suspension is loaded up heavy.

 

[Hasan]

I would also suggest more toe at the rear like 0.1

As a general good driving technique, lifting off throttle in a corner is not a good idea. In fact, any sudden changes in input is not a good idea. When you lift off, there is weight transfer to the front coupled with toe changes that would encourage the rear to step out. Smooth and balanced is where you want to be.

 

[Excalibur]

Did you ever get to the bottom of this?

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