2022 Subaru BRZ Top Speed Run 140mph on private road

[quikag]

Not bad for an NA 4 banger. Car felt rock solid at 140mph. Great chassis that can clearly handle more power and speed. Loving this car!

[dragoontwo]

Solid? At what speed did the lightness in steering go away at?

[Up4speed]

"Private road"...."Hazard reported ahead".....hmmmmm lol

[KillerBMotorsport]

You should calibrate to GPS. There are some pretty decent apps for this, but generally indicated is lower than reality. My 05 STi was horrible, off by over 10mpg at 150 at a half mile event :/

Even so, 1-5 gears seem to pull pretty consistently. 6th gear acceleration is definitely noticeable slower. Was more of an RPM drop than I would have expected at that speed.

[AK2112]

I've been impressed by how planted the car feels at high speeds. It's really nice.

[quikag]

Originally Posted by dragoontwo

Solid? At what speed did the lightness in steering go away at?

Steering lightness has almost zero to do with chassis stability at high speed.

This car feels surprisingly solid at triple digit speeds. I’ve owned many high performance cars (991.2 GT3, 981 GT4, current C6 ZR1, current CT5V Blackwing, etc.) and this car feels good, especially considering the price point.

[dragoontwo]

Originally Posted by quikag

Steering lightness has almost zero to do with chassis stability at high speed.

This car feels surprisingly solid at triple digit speeds. I’ve owned many high performance cars (991.2 GT3, 981 GT4, current C6 ZR1, current CT5V Blackwing, etc.) and this car feels good, especially considering the price point.

So unloading the front suspension at higher speeds has nothing to do with stability?

[quikag]

Originally Posted by dragoontwo

So unloading the front suspension at higher speeds has nothing to do with stability?

Nope, unless you are turning or the suspension is crap and you get significant float. Even still, my point still stands. This car, for $30k, has surprisingly good stability at high speeds. Suspension compliance, chassis rigidity, and precise steering give it the feel of a more expensive and sophisticated car. I'm surprised how effortlessly it will go down the road at 110-130mph (obviously engine is spinning, but it seems happy too).

[OkieSnuffBox]

Originally Posted by Up4speed

"Private road"...."Hazard reported ahead".....hmmmmm lol

Quoting because me thinks OP is full of shit.

[Dadhawk]

Originally Posted by KillerBMotorsport

You should calibrate to GPS. There are some pretty decent apps for this, but generally indicated is lower than reality. My 05 STi was horrible, off by over 10mpg at 150 at a half mile event :/.

Actually isn't it the other way around (Speedometers tend to read high rather than low, by SAE regulations) unless of course you've changed your tires out for a different size without recalibrating.

The US doesn't have specific regs on speedometer speeds but most European countries require the speedometer to NOT read low, but it can be off by as much as 10% on the high side (it says you are going 66kph but you are doing 60kph).

Every car I've tested with GPS always read high by a varying degree. Never seen one with correct tires read low. Then I again I don't commonly drive my cars at 150MPH either.

[dragoontwo]

Originally Posted by Dadhawk

Actually isn't it the other way around (Speedometers tend to read low rather than high, by SAE regulations) unless of course you've changed your tires out for a different size without recalibrating.

The US doesn't have specific regs on speedometer speeds but most European countries require the speedometer to NOT read low, but it can be off by as much as 10% on the high side (it says you are going 66kph but you are doing 60kph).

Every car I've tested with GPS always read high by a varying degree. Never seen one with correct tires read low. Then I again I don't commonly drive my cars at 150MPH either.

Interestingly enough at least one of my Ducatis owners manual states the percentage of how high that the readout displays, but that the ECU sees the correct speed.

[Dadhawk]

Originally Posted by dragoontwo

Interestingly enough at least one of my Ducatis owners manual states the percentage of how high that the readout displays, but that the ECU sees the correct speed.

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.

Tesla is a bit of an exception for this as they use all available data to indicate the speed, which usually makes them dead on.

[KillerBMotorsport]

Originally Posted by Dadhawk

Actually isn't it the other way around (Speedometers tend to read low rather than high, by SAE regulations) unless of course you've changed your tires out for a different size without recalibrating.

The US doesn't have specific regs on speedometer speeds but most European countries require the speedometer to NOT read low, but it can be off by as much as 10% on the high side (it says you are going 66kph but you are doing 60kph).

Every car I've tested with GPS always read high by a varying degree. Never seen one with correct tires read low. Then I again I don't commonly drive my cars at 150MPH either.

There are a couple of good apps out that do a really good job. They will only calculate speed when they have good signal from many satellites. One I came across would even give %error, depending on the number or satellites licked on, but it was laughably low.

I would see a pretty decent change from summer to snows, even though they were the same size. I would imagine you'd get a couple-few MPH off with brand new tires vs bald ones. The math says they'd read different.

In most of the Subies I've owned, doing what you think is 80, is really 75-78. So scaling that up, it made perfect sense why my speedo was indicating 160mph, but the timing gate showed 150mph.

[Dadhawk]

Originally Posted by KillerBMotorsport

...In most of the Subies I've owned, doing what you think is 80, is really 75-78. So scaling that up, it made perfect sense why my speedo was indicating 160mph, but the timing gate showed 150mph.

I realize now we are both saying the same thing (speedometer is typical lower than actual speed), somehow I managed to read your statement backwards....