BRZ Japan verified 4 more hp vs North America - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Tcoat · 04-10-2021, 08:55 PM

4 HP is within the margin of error for any dyno ever made.
You lose more than 4Hp on a hot humid day.

Blighty · 04-10-2021, 09:09 PM

The interesting thing about this confirmation is that the Subaru spokesperson said the spec sheet was accurate.

Does that mean the 13.5:1 compression is also accurate?

Its an interesting situation.

soundman98 · 04-10-2021, 09:25 PM

Quote:

Originally Posted by Tcoat

4 HP is within the margin of error for any dyno ever made.
You lose more than 4Hp on a hot humid day.

Quote:

Generally speaking, an engine loses three percent of its rated power for every 1,000 feet of altitude gained.

https://www.jiffylubesocal.com/jiffy...50%20elevation).

@200HP, 3% is 6hp...

Also:
The change in horsepower is proportional to the inverse square root of the ratio of the two temperatures. This represents a 1.02% increase in horsepower. If the engine was producing 850 hp at 77 °F, it would produce 867 hp at 57 °F

https://buildingspeed.org/2012/04/23...2057%20%C2%B0F.

Tcoat · 04-10-2021, 10:07 PM

Quote:

Originally Posted by Blighty

The interesting thing about this confirmation is that the Subaru spokesperson said the spec sheet was accurate.

Does that mean the 13.5:1 compression is also accurate?

Its an interesting situation.

If they ever spoke to a "spokesman" and if they did they even had a clue what they were talking about.
Their "spokesman" they quote so often has told us there will be a turbo BRZ every year since 2015.

Lelandjt · 04-11-2021, 02:07 PM

Quote:

Originally Posted by Tcoat

4 HP is within the margin of error for any dyno ever made.
You lose more than 4Hp on a hot humid day.

You mean "chassis dyno", right? I'd expect an engine dyno in a manufacturer's R&D lab to be that accurate and with their ability to control variables I'd expect they could do repeatable pulls with less variance.

Lelandjt · 04-11-2021, 02:12 PM

Aren't horsepower numbers usually a little different in different markets because of fuel and emissions? Isn't the ECU different? Sure, they usually issue a blanket power spec worldwide but isn't that not quite accurate? So long as power isn't overstated it's accepted that especially among certain makes(Porsche, BMW) the stated power is not correct.

04-10-2021, 08:55 PM	#15
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,845 Thanks: 61,656 Thanked 108,283 Times in 46,456 Posts Mentioned: 2495 Post(s) Tagged: 50 Thread(s)	4 HP is within the margin of error for any dyno ever made. You lose more than 4Hp on a hot humid day. __________________ Racecar spelled backwards is Racecar, because Racecar.

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04-11-2021, 02:12 PM	#20
Lelandjt Senior Member Join Date: Mar 2020 Drives: '04 STi, '12 Mazda 3 Hatch Location: Breckenridge, CO Posts: 379 Thanks: 30 Thanked 122 Times in 89 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Aren't horsepower numbers usually a little different in different markets because of fuel and emissions? Isn't the ECU different? Sure, they usually issue a blanket power spec worldwide but isn't that not quite accurate? So long as power isn't overstated it's accepted that especially among certain makes(Porsche, BMW) the stated power is not correct.

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