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Old 01-06-2003, 07:36 PM   #1
Adick2
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Lightbulb I wonder if it will have the twin scroll turbo

would be intresting to see if they are going into include that.
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Old 01-06-2003, 10:37 PM   #2
gtguy
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The twin-scroll helped driveability with the 2.0-liter turbo engine. The STi gets better than a twin-scroll...a 2.5-liter turbo motor. There will be low-end torque for days.

Kevin
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Old 01-06-2003, 10:39 PM   #3
ciper
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Twin scroll? Who wants VALLEY OF DEATH?!
I think that image is the best example.
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Old 01-06-2003, 10:46 PM   #4
Jon [in CT]
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Quote:
Originally posted by ciper
Twin scroll? Who wants VALLEY OF DEATH?!I think that image is the best example.
You twit... you're confusing the 2-stage (aka TWIN) TURBO Legacy engine with a TWIN SCROLL turbine.
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Old 01-06-2003, 11:06 PM   #5
Adick2
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Talking

Im feeling the Love. Does anyone know if anyone has taken a 02 wrx and put a Twin scroll turbo in it? trying to find someone that can pull it off.
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Old 01-06-2003, 11:08 PM   #6
ANZAC_1915
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At this stage the twin scroll looks like JDM STi only.

A better question is: does the USDM STi have equal length headers. I speculate not.
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Old 01-06-2003, 11:12 PM   #7
ciper
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Jon [in CT]: OOPS, my bad. All this excitment got my panties in a twist. Currently there are about 230 members in the STI forum alone
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Old 01-07-2003, 01:20 AM   #8
OedipusWRX
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I doubt they went to the trouble of a twin scroll setup as the extra displacement should do the trick alone. That would be fine with me as the twin scroll means equal length exhaust means no distinct boxer exhaust beat. I love the traditional sound of the boxer.
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Old 01-07-2003, 01:41 AM   #9
Red Rocket
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You know, I wouldn't be suprised if the sti came with the (nothing special) VF30 turbo. Even that should have no problem making peak torque by 4000 rpm on a 2.5L.

Kevin
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Old 01-07-2003, 07:39 AM   #10
cardin555
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Question Okay, stupid question time...

What is the difference between the normal turbo and a twin scroll?
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Old 01-07-2003, 07:58 AM   #11
RidinLow
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I was reading in Evo about the new JDM STi that the exhaust pulses that give Subaru motors their distinctive rumble are detrimental to spooling the turbo, so a new set of headers and the twin scroll eliminate the pulses for noticeably quicker spool... as well as the distinctive Scooby exhaust note.
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Old 01-07-2003, 08:22 AM   #12
Blindeye_03
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Yea...what is twin scroll. Explain!


-justin
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Old 01-07-2003, 09:02 AM   #13
PSSSST
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Default Re: Okay, stupid question time...

Quote:
Originally posted by cardin555
What is the difference between the normal turbo and a twin scroll?
Here http://forums.nasioc.com/forums/show...ht=twin+scroll
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Old 01-07-2003, 10:48 AM   #14
C-daleRidr
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Since this engine peaks out torque at 4000 rpm, it sounds like turbo lag won't even be noticeable. Beauty of a 2.5. You'll feel the torque pulling your butt into the seat until 4000 rpm, and the turbo will probably be spooling by then to keep it in the seat until you shift again. No need for twin scroll or twin turbo with that.
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Old 01-07-2003, 11:10 AM   #15
Porter
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A little birdy told me it would be twin-scroll. All STi motors are moving to this design.
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Old 01-07-2003, 02:26 PM   #16
ciper
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RidinLow: I think I read that same article. They designed the headers to that the exhaust pulses matched each other (or cancelled themselves). It still feels like a subaru engine but sounds like something we havnt heard before.
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Old 01-07-2003, 03:36 PM   #17
Frederf
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Speaking of which, I'd really like to hear .WAV files of the STi7 vs the STi8 2.0L vs the STi8 2.5L.
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Old 01-07-2003, 04:57 PM   #18
kage
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Quote:
Originally posted by Porter
A little birdy told me it would be twin-scroll. All STi motors are moving to this design.
All STis except the ones offered in Europe and I believe Australia you mean?
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Old 01-07-2003, 05:41 PM   #19
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Quote:
Originally posted by C-daleRidr
Since this engine peaks out torque at 4000 rpm, it sounds like turbo lag won't even be noticeable. Beauty of a 2.5. You'll feel the torque pulling your butt into the seat until 4000 rpm, and the turbo will probably be spooling by then to keep it in the seat until you shift again. No need for twin scroll or twin turbo with that.
Low end torque means (probably) higher compression motor (more than the WRX 8:1) which means less tweakness. If this thing comes with 8:1 (like WRX). Slight increase in boost a little reflash and you approach 400hP at the crank. Higher compression motor, less tweakness (unless you decrease CR via internal engine mods) means FHI puts you in a box. I want one, I want to run with the Vettes and the other big boys. This platform has the potential (without big risc) but only if the CR is around 8:1.. Come on I been bleating the question for 2 days. I wants to know,, CR, weight and final drive.. plaleesssee!!!! tlez me..
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Old 01-07-2003, 06:18 PM   #20
Red Rocket
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Quote:
Originally posted by tolnep


Slight increase in boost a little reflash and you approach 400hP at the crank.
Sorry, that's not going to happen. It's unlikely that we'll see any turbo with a compressor side bigger than the VF30/34. Those are good for about 340-350 hp, without pushing them too hard. More than enough to make 300 hp stock.

The car is just begging for a turbo upgrade - think PE1820, APS SR40, or AVO garret hybird. Add a fuel upgrade, FMIC, exhaust, ecu/remap and some odds and ends, this will actually put you up to the 400+ hp level, fairly reliably.

Kevin
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