The tach keeps rising even as the speedometer goes past 400KPH. I don’t think it maxes out the tach. It certainly goes into the red zone, though.
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Then it's probably a coincidence. The calculation rounds up the result to the nearest exponent of 20, but it doesn't take anything above redline into consideration, because you're not supposed to go into the red zone. You can, thanks to the fact that the turbo disables the rev limiter. So the top speed of the upgraded Countach is probably slightly below 400 without the turbo, so once you use the turbo, it goes faster than 400.
I'll add a bit of buffer to the max rpm in the calculation. That should increase the top speed on the speedometer.
Yeah, just from some recent playing with a fully upgraded Countach, I can go well above 400KPH. It almost maxes out the tachometer to 9000RPM.
I was seeing this on the “Cruising” course, both the first and last segments, and probably others along the way. The fully upgraded Countach is a lot faster than you’re giving it credit for.
And all this is with full assists: automatic transmission, anti-lock brakes, traction control, the whole nine yards. I’d presume much faster is possible if you turn assists off?