2022 Subaru BRZ Top Speed Run 140mph on private road

[KillerBMotorsport]

Originally Posted by Dadhawk

Same with most modern cars. All the traction nannies need accurate speed to do their jobs but that information never makes it to the speedometer.

Speed if obviously a factor, but more importantly are deltas between what is and should be when it comes to stability control. What are the other wheels doing, steering angle, + or - acceleration, pedal inputs, and a bazillion other things.

Then again, the cars I'm describing are all pre-2015. Maybe the BRZ is much better. I'll have to check our shop 22 WRX and see how close it is too. Hopefully it better than it was.

[quikag]

So, I did 130mph for 30 seconds or so yesterday and had Waze open. Surprisingly, the speed indicated on Waze (GPS) was within 1-2mph of what the speedo was saying. That is the tightest I've seen of any cars I have compared.

[KillerBMotorsport]

Originally Posted by quikag

So, I did 130mph for 30 seconds or so yesterday and had Waze open. Surprisingly, the speed indicated on Waze (GPS) was within 1-2mph of what the speedo was saying. That is the tightest I've seen of any cars I have compared.

I don't know how accurate Waze is (I guess you could compare it to a GPS speed calibration app), but that's pretty close. Error scales with speed, so at 60mph it's next to nothing.