I totally read this in your voiceJust some clarifications on our thoughts:
Does the Verkline kit help with reducing bump steer? Yes, it is engineered to.
Does the Supra come from factory with bump steer? Yes, it is designed to have bump steer, this car handles with a real sense of agility and requires a driver's full attention.
The car 'loses rear toe in' on corner entries, which really helps the car rotate into these corners. It doesn't understeer, at all. On a tighter, twistier track, this can be thrilling and really easy to control, a little loose on the entry, grips up (more toe in) as you exit the corner. But at autobahn speeds or the fearsome Nurburgring, I can also see how it can be unnerving. Especially if Apex is using the car as a rental for customers of all skill levels.
For the majority of us, I think a reasonable ride height and a little more rear toe in will go a long way. If you absolutely hate the Supra moving around under you, well, the Verkline kit is there as an option for you. This is my honest opinion.
Agreed, it's strange with the non owners posting these Youtube videos when you have someone like Jacki Ding, a forum user and winning Global Time Attack racer proving people wrong with the A90 platform.Without replacing the subframe, there are plenty of people saying this is a capable track car with just a couple provisions - with times to prove it. To me, it's right in line with the wind buffeting issue.. if you feel as though it's a problem, then fix it.
Do you really think Toyota engineers would have ignored something of this manner during testing? I'm sure they felt it but I see it more of a limitation with the components that was provided to Toyota. Not to spark the debate of BMW parts Zupra but previous BMW Z4's had this issue.Bump steer can be engineered in to the handling of a car or it can be an 'error' via incorrect engineering.
But I can't see how Toyota would have wanted bump steer for a road car, so I have to think it must be an error on their part. (Especially as they knew owners would want to lower their cars with aftermarket products - where bump steer toe angle will be more pronounced).
For a street car you want stability and predictability, and especially both of those for safety on the highway.
For example, say you were driving along a freeway and you are following a line of traffic and accelerate to overtake, reaching a speed of say 75mph, when all of a sudden there are much slower vehicles ahead and you need to brake heavily and possibly need to steer in to an emptier lane at the same time. (A situation that happens a lot on highway driving and more so in rush hour times when traffic can suddenly build up).
....Any amount of bump steer is going to cause real problems for the driver, especially a typical average driver or even one that is used to sports cars.
I just can't see Toyota placing a reasoning of "lively handling" for say track driving above a reason for safety on everyday street driving.
I guess the main question is how bad is the bump steer - I am commenting from a racing background and also from a position of non-ownership at the moment, but keeping an eye on the MkV in case they bring out a manual gearbox option.