DSMBRETT

I got news today that a US spec EVO VIII dynoed and made 230 wheel horsepower on an AWD dyno jet. This means the car is packing serious power as a stock WRX only made around 188-190 on the same dyno! Good to see that the car is packing some heat even in the slightly watery U.S version.

Brett.

3K

iTrader: (9)

Yeah Baby!!!

solitaire

Isn't that about what you'd expect (if the 271 HP rating were accurate)? If a WRX is rated at 227 and ends up with around 190, it's losing 40hp to the awd drivetrain. Since the Evo 8 is rated around 270 hp, if it lost the same 40 hp, it'd end up around 230, right?

Turboniam

If the EVO dynoed at 230 to the wheels and it is rated at the crank as having 271, the drivetrain loss would be 14.76%.

I thought AWD had more drivetrain loss than that??? I thought they were like high teens or low twenties for drivetrain loss??

evo_dan

Maybe Mitsubishi under rated the hp figures. I believe the drivetrain loss on the Evo VII was around 24%.

Turboniam

Where would we be able to find out the actual answer to the % of drivetrain loss... 24% sounds right more than 14.76% ... what I am trying to say is that if the car really dynoed 230 awhp, then I would guess that the EVO is in fact underated.

...but I don't want to jump to conclusions without the actual drivetrain loss numbers.

Ben

Dyno's don't measure a set percentage off of crank hp. A better way of looking at it is a set HP off for each individual drivetrain. For example, if you had a 200hp car that dyno'd 150, then added 100hp for 300 total, you'd dyno about 250hp. You haven't added anything to the drivetrain, it's still got the same resistance, so you will still lose the same 50hp.

Since the WRX and EVO both dyno'd about 40hp off of the official crank hp on that dyno it seems about right to me. They're both AWD so the resistance in each of their drivetrains should be close. Mitsubishi has no reason to understate the HP in the USA.

Ben

Just to sort of back that up, on another dyno a stock WRX dyno'd about 165 whp while a stock 2.5rs dyno'd about 104 whp. Don't be suprised about the low WRX number compared to what was said in this thread, different dyno's will give different readings. The important thing is comparing cars from the same dyno, which the EVO and WRX in this thread were, and the 2.5 and WRX in this post as well. Anyway, if you take the WRX's stock 227-165 you get a 62hp loss, the 2.5rs's 165-104 you get 61hp loss. The drivetrains between the two are almost identical, so there you go, looking at HP loss is more accurate than % loss.

gtr

iTrader: (6)

188-190hp for wrx? That dyno is too optimistic. I've heard 165hp on other dynos. I fear it's only 205hp to the wheels which is accurate to the 271.

ru4real

Ben, you've hit on a new theory that now proves everyone else wrong!
Drivetrains don't have a set horsepower loss or resistance. While you may have found an example that works, it's just a coincidence, and you can't always rely on a manufacturer's claimed flywheel horsepower numbers. Drivetrains lose a percentage of the flywheel horsepower, because they perform according to the power transmission efficiencies of the gears.

gtr

iTrader: (6)

Sounds about right for your car when it's stock. We are talking about our evo viii in the states. I sure hope has underrated our horsepower.

Rasputin

it would be quite the usual for them on the Evo line.

BLACKevoLNCR

YAY!!! 230! now only if i had 40grand to buy one.

gtr

iTrader: (6)

40 you mean 30 right? Unless your talking about the evo vii.