Questions about Full Active Suspension vs normal in a racing enviroment

[Q45tech]

The question is which is worse extra weight on a tire or camber angle changes caused by body roll.Racers solve the problem by limiting body roll with the lighest components possible : Springs and roll bars.

Active suspension are designed for driver/passenger comfort during manuvers not absolute utimate handling...

Even the new BMW 745 active sway bar system decouples and lets the body roll when G force exceeds 0.7 to avoid the driver over driving the tires.........sudden breakaway.

The weight on a tire is not influenced by the body roll per se, the body roll is the INDICATOR of the weight shift, therefore without body roll the driver must use other senses to determine the weight shift.

In a race car you can design the suspension camber gain curves to keep the tire flat as the body roll never exceeds a few degrees vs 6-8 in a smooth riding passenger car.

If a Q car has a 61" track and one spring compresses 3.5" [other rises 3.5" ........the roll angle is 6.5 degrees........even with 145 in/pound of front springs and a delayed but roughly equal sway bar to control the close to 900 pounds of possible weight shift...................for racing one would need to almost triple the the 250 combined to at least 600 pound inches to limit body roll to 2deg and 1200 pound inches for 1 degree.

Most race cars weigh less so around 600 is the norm for a 2500 pound car.

[fxjackso]

Two things to consider.

Kryder racing campaigned the Geoff Brabham Stillen Q45 active car as a racer, including the 24 hour Nelson Ledges race, where it finished despite being hit by another car. However, Kryder is an established Nissan shop with some sponsorship...The Mercedes AMG S55 uses a stock S500 ABC (Active Body Control) suspension with no performance modifications. None are needed. The suspension is very similar to the Infiniti active, and that says a lot about the capabilities.

But, we have to face this, all of the first gen cars are old. And a complicated , old race car is going to be a chore- a simple old one is. With your cash you would have a big expensive curiosity, and a lot more to fix between races. But, its a hobby, right?