Keep hearing about frame twist with 440s

While Uncle Tony definitely has some knowledge on other aspects of these cars, he’s just proving further that he’s making it up as he’s going along on chassis reinforcement and handling. He’s out of his depth if he’s not talking about driving in a straight line.

Handling control is about precision and predictability. If your chassis sucks up all of your inputs and reactions with flex, you can’t be precise. If you can’t predict exactly how the chassis will react to a given input, you can’t control the car as well.

Yes, there’s a balance. If the chassis is rock hard and transmits every bit of chatter and noise to the driver then it will be more difficult to control. But here’s the thing, that’s not all chassis. A lot of that is how your suspension is set up, how your alignment is set, whether or not you’re in oversteer or understeer, etc. And the chassis isn’t even the biggest component of some of that set up.

And let’s face it, adding subframe connectors doesn’t make these cars all that stiff. I have a bunch of chassis stiffening on my car- torque boxes, subframe connectors, j-bars (forward chassis reinforcement), a tubular radiator support brace, etc. Yes, my car is much stiffer than it was from the factory. But it’s not anywhere near as stiff as a car with a full cage. Or even a high end modern performance car.

Yeah, the average driver would think an F1 car is insanely hard to control. But subframe connectors don’t make these cars anywhere near that stiff. Even the level of chassis reinforcement that my car has, which is more than a lot of these cars have, doesn’t make it overly stiff. If anything it still has more flex than would be ideal, even for a street car. Plus it’s a moving target- if you have 15” rims with crappy compound tires you don’t need as much chassis reinforcement, you’re not putting as much force to the chassis. If you’re running soft compound 275’s on all 4 corners even with a significant amount of reinforcement you’ll still get flex because you’re transmitting a lot more force.

I know you know a lot...But no. Uncle Tony isn’t making it up as he goes along. I may have misrepresented his comments. If you’re interested, check out the video.

Don’t get me wrong. I don’t think that a more flexible chassis is better, at least not for the kind of driving that I enjoy. That said, some compliance in the system can absolutely make a car more forgiving and it doesn’t mean that the flex will be unpredictable. A lot of that comes from the driver knowing the car. Chassis flex doesn’t tend to present like slop from worn ball joints or a worn track bar bushings on a solid front axle vehicle that can surprise you (usually not in a good way).

On most roads in the USA these days when the rich people own everything and don’t pay taxes (eff you, Jeff Bezos) the roads are going to hell. Our infrastructure is crumbling everywhere. A stretch of road without potholes, cracks, cheap patch jobs, etc is pretty rare in most parts of the country. As a result, you could bring the 2019 SCCA Solo2 champion modified whatever car out to some local rural back roads and it might get dusted by the same driver in a bone stock Miata- some actual suspension travel and compliance in the system from shocks chassis flex, etc. might be a huge advantage depending on the surface where none of that is helpful in the controlled environment of a sanctioned autocross lot. Is it better if you can get all of that compliance from the suspension? I would say yes as someone who plans to keep cars for decades but flex can be engineered to be part of the system, not unlike the wings on any passenger plane.

As for Tony’s example of maintaining control on the drag strip in car with drag tires, probably no oil in the front shocks, slant 6 sway bars, etc; I can at least imagine that extra slop of a non-reinforced chassis might give you a tiny bit more of a warning and save you from smacking the wall. I haven’t been horsing around with muscle cars since the late 70s like Uncle Tony so I’m not able to report on my own experiences but intuitively, that sounds plausible.