Grand Touring Member
Join Date: Oct 2004
Location: Sydney, Australia
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If you're stomping on the brakes you're going to unsettle the car. Unless you're running proper downforce, at those speeds you're going to have issues.
Did you notice the front or the back getting vague? If its the back, its par for the course as the weight shifts away from there, reducing traction. If its the front, then I'd investigate more closely.
Did you tell your suspension guy how fast you were going? Alignment settings for 70mph will not be the same as alignment settings for 150mph. You're going to want to run a lot more toe in, for starters, and if you're only interested in straight line stuff you can reduce the negative camber. Also, did they check the pressures? I find most tire shops don't, and this can have an effect on handling.
"I swear, officer, its all factory options!"
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Understeer is when you hit the tree with the front wheel.
Oversteer is when you hit it with the back.
Horsepower is how hard you hit the tree...
Torque is how far you drag it...