Actually if you use the dynojet numbers for the WRX as a starting point(I am not saying this is 100% accurate as these are two different cars) then the 230 wheel horsepower equals around 271 horsepower. The WRX lost 16 % to the wheels on the dynojet. 227 flywheel hp =190 wheel horsepower. If you use the same 16% loss then the EVO VIII's 271 flywheel hp=228 wheel horsepower. Pretty close to the 230 wheel horsepower it made. Unless my math is bad?

Brett.

 

Don't worry about hp figures on a dyno, as they all vary. What u guys have forgotten about is the massive torque that the EVO VIII makes, and starts at around 2750rpm. That's what gives u accelleration. My EVO III in Australia when stock,had a power reading of 180 hp on a Dyno Dynamics dyno. ,compared to factory figure of 270hp at the fly. After adding a 3"dump pipe, and 4 extra
psi (17psi) , it produced 219hp on the same dyno. Mine friends stock EVO 4 reads 180 hp , same dyno compared to factory figure of 280 hp. These figures represent a power loss of around 32% , which is around the mark on these 4wd dynos . Forget the power figures, performance is the important thing. My EVO III which is almost stock will run the 1/4 in around 12.7 @ 107mph.,with a 1.7 60 ft. (evo 3 is 300 lbs lighter than evo8) You have to put bigger turbos, differnt ECUs, exhaust, cold air intakes etc to get anywhere near those times with a WRX . The thing with EVOs is , they are special. Not every one with an ******* has one, unlike WRXs, which are still a very good car. Up till now, the STI have always fallen short in performance against the equivalent EVO, but the new US spec STI could be a match, going by the specs. They still will not have the same aura that all EVOs enjoy.

 

Who cares what the flywheel horsepower figures are. WHO THE HELL DRIVES THEIRS CAR WITH JUST THE FLYWHEEL INSTALLED!!!!! - - - - - - -

Horsepower and Torque to the ground is what actaully matters. Why even try to calculate the flywheel power when it means NOTHING! I could care less how much flywheel horsepower I had, as long as I knew I put more to the ground than the next guy.

Think real world guys. What does a race boil down to.

Jeff

 

Thanks for the info... btw, what do you mean by "almost stock?"

 

The math doesn't work like that though.

Like I said in my last post, how about we take what 230 whp on a Dynojet would equate to on a Dyno Dynamics dyno, around 196 whp(maybe even less since jjvr4 said his 270hp EVO III did 180 on it). Now we take your 24% drivetrain loss and end up with 258 crank HP. Now the EVO VIII is overrated.

So you see, dyno numbers can be manipulated to pretty much anything you want. About the most accurate numbers you'll get are comparing to what another car did on the same dyno, under the same settings and conditions. In this case the WRX with 190 whp, which being AWD should have similar drivetrain losses. Defidently not enough to make to much of a difference either way.

Mitsubishi has NO reason to lie about the HP figure in the USA. If they were really making 300hp they would have advertised that because of a little thing called STI. They'd want the EVO to look it's best with it's introduction to the USA and a higher powered competitor on the market.

So basically 271 crank hp should be about right. Just do the usual mods and run 350 easy, no big deal.

 

Boost increase from 13 to 17psi, HKS airfilter, and 3"dump and Hi-Flo cat going into 2.5" exhaust. That's all.
I am going to dyno it again and then drop the cat back exhaust for a power comparison .It feels quite restrictive and is very quiet.

 

The driver.

This is the first logical thing you've posted in this thread! You're absolutely right, and I have no reason to doubt that this engine is indeed rated 271 HP +20/-0 (meaning an "average" engine might be more like 280, but every engine will be at least 271). Chassis dynos are merely a useful tool for A/B comparisons, but can be manipulated to show just about anything. This article is a classic example. The tuner "nerfed" the initial dyno ("OK, a dead standard car puts out about 152hp at the wheels.") which made for impressive results. Except that nearly every stock S2000 ever dynoed has yielded 190-210 (DynoJet), or 175-190 (Dyno Dynamics or Mustang). So take things with a grain of salt. If someone is selling you an exhaust upgrade that gets an 18% improvement on his dyno, don't believe him

 

What about insurance reasons? I am pretty sure the new Cobra Mustang (rated at 390hp) is well underrated. Not sure why, but it is.

Time will tell.

 

I LOVE this thread.
Especially 'cause the numbers are so meaningless. Give it 3 more weeks, go harrass your dealer and drive the EVO.
Just my $0.02.

 

Yes, it's way underrated. They are commonly dynoed around 370rwhp! Which means they actually make around 425hp.
It's really not uncommon for car companies to under-rate their performance cars...at least it seems the domestic manufacturers do. I think insurance has is one reason.

 

If the WRX dynoed at 190 stock the dyno is obvisouly rated very high. If the EVO VIII Dynoed at 230 on that same dyno, those results are also VERY HIGH. The WRX lays down 16x WHP, so I see the EVO VII laying down 20x WHP not anywhere near 23x WHP.