Lycoming wrote:No, you just always do it.
You could measure weight by spring travel, but its a very shoddy measurement if the car is still moving.
Okay, well thanks for the answer. However I would not measure the weight that way, I'd use tiny strain gauges... yes, I know, that's a kind of spring but not like a bouncy suspension. But there are still lots of big aerodynamic forces that would have to be allowed for quite accurately so I'm not really surprised if they don't bother.
I was just intrigued to hear a team reminding a driver to do it. I suppose sometimes they know things have got a bit close to the limit - if the tyres are right down, the tank is on fumes and the driver has lost 2 stone in sweat
Cheers!