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Old 02-07-2003, 09:43 PM   #1
FirmWind
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Default USDM STI vs. UK Prodrive STI?

http://autozine.kyul.net/html/Subaru1.htm#STi

I was just reading this, and noticed that the Prodrive STI in UK gives similar specs. I was wondering just what the differences might be. What would motivate Subaru to increase engine size vs. just sell cars stock with the Prodrive kit?
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Old 02-07-2003, 10:40 PM   #2
strangerq
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It's been pointed out a few times that the prodrive kit is aftermarket basically and does not meet EU or Cali Emissions standards - and does not have to. Really what the kit does is
increase power by increasing exhaust emissions essentially.

Bottom line - in order to make 300 hp and 300 pf torque and meet emissions standards, and have some room for future power increase more displacement was needed.
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Old 02-09-2003, 11:55 AM   #3
ANZAC_1915
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There's also the issue of octane --- I'd wager the Prodrive kit uses more boost than the 2.5 STi to make the same power (duh) so your chances of running into det issues here would increase.

The other thing is the 2.5 STi engine probably develops a big wallop of torque low down; even though Prodrive typically tends to tune for a big area under the torque curve you can't tune in extra cc's.

In real world terms I'd expect the 2.5 STi to be quicker even with the same specs.

Glenn
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Old 02-09-2003, 03:59 PM   #4
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Quote:
Originally posted by Glenn Wallace
There's also the issue of octane --- I'd wager the Prodrive kit uses more boost than the 2.5 STi to make the same power (duh) so your chances of running into det issues here would increase.

The other thing is the 2.5 STi engine probably develops a big wallop of torque low down; even though Prodrive typically tends to tune for a big area under the torque curve you can't tune in extra cc's.

In real world terms I'd expect the 2.5 STi to be quicker even with the same specs.

Glenn
The huge low-end torque will definitely be a lot more useable. Prodrive is apparently tuning the WRC cars to have more low-end torque per feedback from the drivers (from the Feb. '03 Best Motoring video that's floating around here).

It'll be great if any STi owners are into auto-X.

Word.

-Milan
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Old 02-10-2003, 07:14 PM   #5
ANZAC_1915
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The US STi will probably also be lighter than the Euro STi.
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Old 02-10-2003, 08:26 PM   #6
Lennie Rhoades
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Why will the USDM STi be lighter than the Euro version? It's unusual for US-spec cars to be lighter than their Euro brethern due to our extra saftey and emissions requirments. I know we're supposed to be getting lighter glass, and aluminum hoods, but I'd think the Euro cars will get that too.
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Old 02-10-2003, 08:59 PM   #7
Jon [in CT]
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I agree with Glenn, the USDM STi will be lighter than the Euro version. The US has a Gas Guzzler tax that kicks in starting at $1000 if the combined city/highway EPA fuel economy is less than 22.5 mpg. The EPA requires that fuel economy be measured on a dyno with the hood up, so the big hood scoop becomes a liability instead of an asset. Because it sticks up more than an inch, its frontal area must be included in the formula that calculates aerodynamic drag, which increases the dyno braking horsepower. Reducing the vehicle weight has a direct beneficial effect on its EPA fuel economy.
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Old 02-10-2003, 09:03 PM   #8
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OK, let me try again. How will they make the USDM model lighter than it's Euro and Japanese cousins? I understand the benefits (MPG and putting the EVO8 to shame), but how will they do it? Thanks.
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Old 02-10-2003, 09:59 PM   #9
ObsidianRS
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Carbon fiber frame?
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Old 02-10-2003, 10:01 PM   #10
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No radio and (most importantly) no rear wing.
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Old 02-10-2003, 10:41 PM   #11
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Err, I did forget we're getting DCCD as standard. But in any event, I'd be surprised if it was heavier.
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