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Old 05-29-2004, 05:51 PM   #1
importluva
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sti question

does anyone know how much power the stock sti puts to the ground. Ive heard 250awhp but can anyone confirm?
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Old 05-29-2004, 07:25 PM   #2
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i have reason to believe it puts out 300 hp...
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Old 05-29-2004, 07:47 PM   #3
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Quote:
Originally Posted by SuperJew
i have reason to believe it puts out 300 hp...


That's what I have heard too.
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Old 05-29-2004, 08:00 PM   #4
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They vairy from 222 bhp to 350 bhp... It depends upon the model..
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Old 05-29-2004, 08:35 PM   #5
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Quote:
Originally Posted by R34RB30DETTV
They vairy from 222 bhp to 350 bhp... It depends upon the model..
nah man my brother owns a wrx which came out of the factory stock at about 300awhp
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Old 05-29-2004, 08:43 PM   #6
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300hp is at the crank, but there is drivetrain loss so it will be less to the wheels.i cant seem to find the answer anywhere.i know the evo VIII puts down about 225-230whp w/ 271 at the crank, just wanted to know about the STi. im referring to the USDM MY04 STi.
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Old 05-30-2004, 01:20 AM   #7
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OK I have been looking for a long time, and from what I can see all I can get it just that it is 300hp... perhaps (not likely) that is how much is going to the wheels too... but that is doubtfull.. I cant find it anywhere either...
Sad... I am admiting that I cant answer all the questions about the STi...??!?!
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Old 05-30-2004, 03:29 AM   #8
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Quote:
Originally Posted by StiMan
OK I have been looking for a long time, and from what I can see all I can get it just that it is 300hp... perhaps (not likely) that is how much is going to the wheels too... but that is doubtfull.. I cant find it anywhere either...
Sad... I am admiting that I cant answer all the questions about the STi...??!?!

acc to nasioc and clubwrx, ive seen a range from 220-280, but no one is consistent. i guess it varies by individual cars and the dif dynos. o well, im asking just out of curiosity.
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Old 05-30-2004, 08:40 AM   #9
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Quote:
Originally Posted by importluva
300hp is at the crank, but there is drivetrain loss so it will be less to the wheels.i cant seem to find the answer anywhere.i know the evo VIII puts down about 225-230whp w/ 271 at the crank, just wanted to know about the STi. im referring to the USDM MY04 STi.
That's very true....250bhp at the wheels sounds about right to me
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Old 05-30-2004, 04:27 PM   #10
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Quote:
Originally Posted by 87TurboII
nah man my brother owns a wrx which came out of the factory stock at about 300awhp
Yeah, your USA Spec Scooby has 305 bhp from it's T25 engine but over here we have about 12 diffrent models and i just looked it up and i was infact wrong.. They range from 215 bhp to 350 bhp, not from 222 bhp to 350 bhp.. Well, i was 7 bhp out but my point remains...
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Old 05-31-2004, 12:33 AM   #11
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here's a spec, <Link Removed, see post number 13>

but it only shows engine power. Drivetrain losses for a scooby rex are 22%.

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Old 05-31-2004, 05:40 AM   #12
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i recommend you all read <Link Removed, see post below> article from vishnu tuning. Taught me something
BTW, i got the link from a member of nasioc.
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Old 05-31-2004, 08:28 AM   #13
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Quote:
Originally Posted by importluva
i recommend you all read <Link removed, check post below!> article from vishnu tuning. Taught me something
BTW, i got the link from a member of nasioc.
Thanx for that link importluva, I have copy/pasted all the info from that site as it's hard to determin whether or not it's advertising, as there's a Forum there too. I know you wouldn't intentionally advertise, PM me if you have any queries

Quote:
Originally Posted by Vishnutuning
Horsepower Claims: The Good, The Bad and the Confusing
By Shiv S. Pathak

You hear it everywhere. Horsepower claims. Along with their sheer ubiquity comes a whole lot of confusion. You see, horsepower claims, by judged by themselves, are nearly impossible to quantify. Let alone compare amongst themselves. Here's why…

Virtually all dyno testing done by aftermarket tuning houses are done on something known as a "chassis dynamometer." As the name implies, the entire car is parked on the dyno apparatus where its wheels sit upon big rollers. When the wheels spin, so do these big rollers. The dyno computer monitors the force at which these rollers spin to determine horsepower. Sounds simple, doesn't it?

Problem is that these numbers represent wheel horsepower, not engine horsepower which is what most people assume when playing the horsepower game. After all, we all know how much engine horsepower our stock car makes by just looking at the manufacturer's claims. But wheel horsepower is something all together very different. It does not take into account frictional losses caused by the drivetrain. That's right. The transmission, differentials, axle joints, etc., suck up their fair share of horsepower. As you can imagine, a car's wheel horsepower is always lower than its engine horsepower.

So how do aftermarket tuners make engine horsepower claims if they only have wheel horsepower dyno results to go off of? Simple. They take an educated guess. Now here's where things get tricky. Not everyone guesses the same way. Don't ask us why. If it were up to us, there would be standard guessing procedures. But until that happens (don't hold your breathe), customers need to know what they are getting.

But first, let's look at a totally hypothetical example. In our make-believe world, a stock Pontiac Firechicken makes 100 horsepower on the Supa Fresh Chassis Dyno. According to Pontiac, the engine is rated at 135 horsepower. Assuming this to be true, we can safely say that 35 horsepower is used to spin the drivetrain. But now let's say we put on our tuning hats and bolt on a big fat turbocharger. While we're at it, let's stick on an intercooler, bigger injectors, a stand-alone engine management system, a full exhaust and a pair of fuzzy dice. All of a sudden, the car is spinning the dyno rollers with 200 wheel horsepower. That's one fast Firechicken! But the question remains: How much power is the Firechicken's engine making? Now comes the time when we place our bets and make our guesses.

One of the more popular guesses is to assume that the Firechicken, which doubled its wheel horsepower, has also doubled its engine horsepower. Sounds reasonable, doesn't it? Ladies and Gentlemen, we now have a 270 horsepower Firechicken.

Not so fast buck-o,

Take a look at the new driveline loss figure. Yep, it went from just 35 horsepower to a whopping 70 horsepower. Does this sound reasonable to you? It may to some people. Others, however, may balk at this is say that doubling the wheel output shouldn't double the driveline loss figure. After all, why should the driveline suddenly need twice as much power to spin it? Sure, the extra power will generate more heat. But an extra 35 horsepower of heat is enough to warm a small Eskimo Village. Where did all that heat go? Good question. No one knows. This brings us to the other, more conservative, guessing technique which assumes that the driveline loss figure of 35 wheel horsepower is going to remain constant regardless of horsepower output. Assuming this is the case, we simply add the 100 wheel hp gains on top of the 135 engine horsepower and come up with 235 engine horsepower.

In summary, the optimistic guess yields 270 engine horsepower.
While the more conservative guess yields 235 engine horsepower.

Which is right? Neither, of course! If either guessing technique were 100% correct, the other wouldn't be used by anyone, right? The truth of the matter probably lies somewhere between the two methods, only quantifiable with big equations with multiple variables. We'll leave that for the mathematicians and physicists who want to figure out who has the fastest Firechicken.

For consumers, it's far easier to ignore the whole engine horsepower thing and look only at wheel horsepower results. After all, isn't that what we're actually measuring?

Wally, I've done the same with yours, I hope you dont mind, as I said to importluva, any problems, feel free to PM me!

Quote:
Originally Posted by Subaru Imreza specs
Technical Specifications:
Engine
Type: Flat-4, Turbocharged
Displacement cu in (cc): 122 (1994)
Power bhp (kW) at RPM: 320(236) / 5800
Torque lb-ft (Nm) at RPM: 310(420) / 4000
Redline at RPM: n.a.
Brakes & Tires
Brakes F/R: ABS, vented disc/disc
Tires F-R: 225/45 ZR18
Exterior Dimensions & Weight
Length × Width × Height in: 173.4 × 68.1 × 55.7
Weight lb (kg): n.a.
Performance
Acceleration 0-62 mph s: 4.2
Top Speed mph (km/h): 155 (250)
Fuel Economy EPA city/highway mpg (l/100 km): n.a.
By the way, those specs are for the WR1 which is a different car all together, I'm not sure how the power differs though, thanx anyway, Wally!

Edit: I updated the Forum rules incase of any misunderstanding, you can view the rules in either the 'Introduce yourself' Forum, the 'General Chat' forum, or the 'Repairs & Maintenance' Forum. Thanx guys!
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Last edited by Cliffy : 05-31-2004 at 09:11 AM.
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Old 05-31-2004, 10:53 AM   #14
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Sorry about that. I don't have any interests in the site I linked, it was just one of thousands with scooby info.
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Old 05-31-2004, 10:55 AM   #15
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Quote:
Originally Posted by Wally
Sorry about that. I don't have any interests in the site I linked, it was just one of thousands with scooby info.
Dont worry about it, I know it wasn't deliberate
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