I think the first thing to consider is how we measure the time… Some folks cover more laps in a weekend than others in a season. Some drivers and tracks are brutal on frames.
What have you checked so far? Have you had it re-scaled and or put on a flat table?
Checked all the mechanical components, seat struts etc etc.
Are there other variables, tires for example.
Have you been able to review and compare data pre and post July?
Well they can definitely crack, but they are usually very easy to see once they do.
There’s some debate on this, given that we don’t even measure spring rate, damping or anything else when they are new.
They can deform of course. Left rail sag is definitely a real thing
They drive whatever they have. Sometimes its new, sometimes it’s two seasons (16 or more tough races) old. Yes some teams and drivers get rid of chassis after one race, but that doesn’t make it necessary. It’s more of a business thing than anything else. Generally those chassis are being leased so the next person is expecting a new chassis. It’s easier to just move the old one on rather than hang onto the inventory…
Of course that perpetuates the perception that “the top guys always throw out chassis after a race”, but when you ask around, it’s not true.
I’ve heard about de-stressing after the chassis has been welded, but not much about after some racing.
In short, before you pony up money for a new (or newer) chassis, get the one you have on a flat table first and check things over. Make sure kingpins arent bent, axle in sideways (it happens) etc etc.