GR86 ACTUAL 0-60 and Weight

[timurrrr]

In my experience, the most precise way to measure a 0–60 in our cars is to

• log the speeds from the ABS sensors of the the front wheels from the CAN bus
  (50 updates per second, 0.02s time precision)
• find what data is coming from those ABS sensors at a constant 60 mph when driving
  in a straight line (highway?) and using an external GPS as a speedo

Using front ABS sensors instead of any data from the rear wheels eliminates wheel slip
from the calculations.

And then GPS is really good at measuring constant speed,
but really bad when measuring changing speed.

[JesseG]

Originally Posted by timurrrr

Jason himself has a great video on different ways to measure 0–60:

I don't remember where, but I heard an opinion that Toyota is known
to not use aggressive clutch dumps when measuring 0–60, similar to
what Porsche is known for. Makes GR 86 indeed look like a Porsche, lol.

I actually like that approach, because it’s similar to what a driver would do in the real world. If you want your clutch and differential to last anyway.
I remember way back in the day with my 2002 WRX I launched it really hard one time. Trying to merge from a stop onto a highway (it’s not supposed to be a highway but people fly on this road). I probably got the very best 0-70 that my WRX was capable of. But I felt so bad for the clutch and AWD system. I only launched it that way ONE time.


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[soilent]

Whaaat. That's crazy. Why are the "official" numbers so much higher in 0-60 and especially weight? Obviously 60 times will be all over the place, but surely they know how much the car weighs. Here's to hoping the power figures have been underrated too ha.

[Razorwing]

if those official stats are inaccurate, that would mean MPG stats would probably be also inaccurate?

[Lantanafrs2]

Originally Posted by Razorwing

if those official stats are inaccurate, that would mean MPG stats would probably be also inaccurate?

Mileage figures are usually inaccurate for most of us. Acceleration figures as well. Driving styles and conditions are different. Mileage gets curved up to please the govt and acceleration numbers that are a little slower might make it easier to insure.

[timurrrr]

Originally Posted by Razorwing

if those official stats are inaccurate

The 0–60 times are accurate in the sense that they are what they measured
following their test protocols. If they (or Porsche) think that clutch dumps
are not allowed to determine 0–60 times, they get "conservative" results.

Any car can do 0–60 in less than 3 seconds if you throw it off a cliff,
but it doesn't mean this is how Toyota should measure 0–60

[NARFALICIOUS]

Originally Posted by Lantanafrs2

Mileage figures are usually inaccurate for most of us. Acceleration figures as well. Driving styles and conditions are different. Mileage gets curved up to please the govt and acceleration numbers that are a little slower might make it easier to insure.

Published MPG is tested by the EPA, not the manufacturer.

[Blighty]

Originally Posted by NARFALICIOUS

Published MPG is tested by the EPA, not the manufacturer.

I was just reading up on some EPA the other night, and due to just the number of new car models each year, manufactures do the majority of the testing - the EPA do 15-20% of the new models each year though, so its a gamble if you don't tell the truth. Something Hyundai found out

[Blighty]

I hope they weight the BRZ too.

[FRSBRZGT86FAN]

Originally Posted by timurrrr

Jason himself has a great video on different ways to measure 0–60:

I don't remember where, but I heard an opinion that Toyota is known
to not use aggressive clutch dumps when measuring 0–60, similar to
what Porsche is known for. Makes GR 86 indeed look like a Porsche, lol.

Also important to note the use of rollout or not when testing like some magazines do

[LancePower]

I always use roll out....

[~el~jefe~]

Originally Posted by LancePower

I always use roll out....

heck yeah.

[humdizzle]

Originally Posted by soilent

Whaaat. That's crazy. Why are the "official" numbers so much higher in 0-60 and especially weight? Obviously 60 times will be all over the place, but surely they know how much the car weighs. Here's to hoping the power figures have been underrated too ha.

acceleration times can be misleading. porsche usually is conservative for instance. they'll give you the 0-60 time of what the car can run in the worst possible conditions and surface.

then you have the dodge demon which they claimed ran a 9.1 ... but in real life against a tesla plaid on the strip it struggled to get a 10.2 while gutted on slicks. trapping a 134 with 1000hp is frankly embarrassing. Ferrari has also been known to inflate their figures as well... often sending seperate test cars for acceleration testing and track testing to journalists.

weight is also a gray area. dry weight / curb weight. fluids and gas or not.

the only test that really matters is real world stuff. what owners are getting on the scales at home and what they run at the quarter mile.

[FlyingJett]

Japan manufacturers measure from idle, German measures from launch control.

So, if BMW says that 320i will take 6.8s to 100 - it means that you need to use their electronic launch control on dry surface and temperature must be something about 15 celcius.