The 90-96 Q45 has a 4.5 degree camber gain [approximately 1.5 more negative per inch of front wheel dive] in turning at 0.8G due to it's high caster and angled multilink [upperlink] impossible to duplicate with a McP front suspension.
Positive caster has its advantages, but it also has a down side as well. When you turn a car left with positive caster the LF rises while the RF drops. This changes the weight on all 4 corners of the car. In effect you're taking cross weight out of the car the more you turn the wheel (taking weight off the RF and LR). The more positive the caster, the more cross weight there is being removed. The more cross weight you remove the looser the car will get. This could be used as an advantage to help free up the car in the corners only when you are turning the wheels. Positive caster will also "create" negative Camber on the outside of the front wheels as the wheels are turned. The higher the positive caster the higher the negative camber gain. Simply adjusting caster may require additional adjustments to camber, depending on the track radius and how much steering is required to negotiate a turn.
Ultralow-profile tire are mosre sensitive to suspension tuning and camber changes. And stiff sidewalls don't conform to road surfaces easily. This makes ultralow-profile tires sensitive to shock, as the short, stiff sidewalls have very little compliance. Harsh surface inputs can make these tires skip and hop across the surgace instead of digging in and finding grip. Large wheel and tire combinations also increase rotating and unsprung weight.
Dialing in negative camber helps combat tread lift and wheel tilt. The trick is to add just enough negative camber so the tread stays flat and 100 percent engaged with the ground under side load and roll. But, adding too much negative camber will hurt more than it helps. Too much negative camber will:
1. Reduce traction 2. Reduce acceleration traction if its applied on the drive wheels 3. Increase the tendency to follow cracks and grooves in the pavement 4. Increase wandering caused by road crown 5. Affect tire wear; the insides of the tire tread will wear faster with more negative camber if you don’t corner hard. Conversely, if you constantly corner hard, your tires will wear more evenly and last longer.
Camber Adjustment Guidelines Driving Style/Front/Rear/
Aggressive Street Driver Multilink/Unequal A-Arm - 1.5, 1 MacPherson Strut - 1.75, 1
Weekend Hot Lapper Multilink/Unequal A-Arm - 1.5-2, 1-1.5 MacPherson Strut - 1.75-2.5, 1.2-1.5
Racer Only or Serious Drifter Multilink/Unequal A-Arm - 2.5-3.5, 1.2-2 MacPherson Strut - 2.5-4.5, 1.5-2.5
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