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Old 05-23-2002, 04:48 PM   #1
aek
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Default Prova twin turbo EJ2.5 !!!

take a look !!!

http://www.apexjapan.com/photonews/tas_subaru.html

Anyone know about this?
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Old 05-23-2002, 04:55 PM   #2
kastle
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D'oh... missed that EJ25 part... wish I knew how to read

Last edited by kastle; 05-23-2002 at 05:25 PM.
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Old 05-23-2002, 05:22 PM   #3
jeffg
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but... afaik: B4's are not 2.5 litres. Hence the title TT EJ25.

Jeff

EDIT: info from link - EJ25 engine, twin "forester" spec turbos, twin intercoolers, WRX STI 6 speed, 6 pot front, 4 pot rear brakes, body work, recaro seats, fancy guages....... all for only twice the cost of a normal B4.

Last edited by jeffg; 05-23-2002 at 06:22 PM.
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Old 05-23-2002, 06:08 PM   #4
DoctorNick
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wow
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Old 05-23-2002, 06:30 PM   #5
In2Deep
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More toys we can't get

drool
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Old 05-23-2002, 06:30 PM   #6
Boostup!
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hmmmm.......I see only one throttle body. Didn't someone here said you need two throttle bodies to prevent the turbos from fighting each other? Maybe this TT Prova is just a show car.
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Old 05-23-2002, 09:06 PM   #7
NickSTi
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from what I read it is not a seq turbo system, but parallel. so if i am not mistaken since one turbo feeds the other as opposed to having a smaller turbo and larger turbo, you wount need a twin tb design.
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Old 05-23-2002, 09:40 PM   #8
Ethan
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Yup known about it for quite some time
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Old 05-23-2002, 09:42 PM   #9
Really_Soaked
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Twin throttle bodies wouldn't help any (asides from the increase in possible air-flow. The turbos wouldn't "fight" each other any more than one would fight itself. All this would need would be a BOV to stop the shockwave produced when the throttle slams shut from stopping the compressor wheels on both turbos - same concept as a single turbo.

Also with a paralel turbo system, the turbos don't interact. From what I understand each turbo spools from the exhaust gasses of two cylinders. The only point the flows cross paths is just before the throttle body and either when they join for a single exhaust or through an "H" pipe if using a dual exhaust (after the turbos). This technique is often used for engines like V8s just to simplify the piping (could you imagine trying to build an equal-length V8 turbo manifold?) The advantage is that the turbos have much better response (since they react like small turbos) but have twice the capacity to move air. This approach doesn't have as much potential as a single larger turbo. As the size of a turbo goes up it's ability to move air increases faster than it's rotating mass. Throttle response suffers, but ultimate power increases. This is why the TT Porsche guys often do a singe turbo conversion when they're really serious about making power.

Well, this is how I understand it at least
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Old 05-24-2002, 03:02 AM   #10
kgb
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Yeah, single turbo will give more power in the end, but can you imagine this thing launched?
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Old 05-24-2002, 03:16 AM   #11
JC
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I don't know that a single turbo necessarily has more potential. I know it's common for TT people, like Supras, to go single when they start making big power but I've always understood that as an issue of simplicity. Supposedly it gets really hard to get the two turbos tuned well or something.

JC
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Old 05-24-2002, 08:20 AM   #12
Really_Soaked
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Actually, larger turbos do have more potential. - That's the one thing I was sure of

As the radius of the turbo increases the air it can move increases exponentially. The friction and mass increase at a lesser rate. I'll see if I can dig up that article I had.
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Old 05-24-2002, 08:33 AM   #13
froggert
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b4's are available with a couple of n/a engines. it's the b4 rsk that's the twin-turbo 2.0l.
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Old 05-24-2002, 09:59 AM   #14
Section 8
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Quote:
b4's are available with a couple of n/a engines. it's the b4 rsk that's the twin-turbo 2.0l.
That may be true, but the car in the article is no longer stock, and it has a twin turbo 2.5 liter.

cheeRS,

Greg
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Old 05-24-2002, 01:07 PM   #15
DLC
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I've been in a sequential and parallel B4, and with 3 B4 owners. The general consensus was that the paralleling was perhaps better for high-rpm, but around the city it was terrible compared to the stock setup.

Dave
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