Haven't taken the 370 to those speeds. But I can say that my 350 gets real loose above 100. The steering feels sloppy and the suspension seems soft at higher speed. The crazy part is my economy "fwd sporty compact" Celica GTS I had before I bought the Z tightened up past 80. It was stable right up to about 140 where it just didn't have the power to pull anymore... You can imagine how puzzled I was at how it felt. Maybe it's the weight of the car and the fact that there is no active suspension to stiffen as speed increases? Obviously, not a lot of time is spent at those speeds so it isn't a big deal, just surprising for a car of this caliber to feel that way. Sorry to hear that the 370 seems to have the same blemish. I do know autoX'ing the Z is a lot more work for me due to the weight. You can really feel it around the corners.
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