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Old 01-30-2004, 12:15 PM   #1
fragment
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Legacy Wondering about the new Legacy 5EAT

I'm considering getting the new Legacy 2.5GT with auto as the family's second car. Knowing myself, I'll likely move into modding the engine right away. Since we'll be modding the 2.5, torque would end up in the 350 ft/lbs region. Given that, will the 5EAT survive?

I know this tranny has been available in the JDM Legacy for a year now, but my searches haven't provided much technical info. So, is this a net new transmission, or an evolution of the 4EAT? Does it use its own ecu (TCU I guess)?

Educated guesses welcome at this point.
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Old 01-30-2004, 02:34 PM   #2
RiftsWRX
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Triple planetary, or electro hydraulic 5speed? Anyone know?

Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 01-30-2004, 06:10 PM   #3
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Found this on the New Zealand Subaru site. Very vauge, but it does suggest new tech in the 5 speed.

Transmission
The extraordinary pleasure of driving a Legacy has been enhanced by advanced transmission systems. Direct hydraulic control delivers superb response while reducing ‘shift shock’. The result is a particularly sporty performance from our automatic transmissions – including Legacy GT’s high-performance 5-speed system – and a quick, direct feel in our manual systems. Low viscosity oils have been used to minimise the required shift force. All manual systems use a dual mass fly wheel to deliver smooth changes with reduced noise and vibration throughout the rev range.
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Old 01-30-2004, 06:31 PM   #4
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I found a complex Flash diagram of the 5EAT on Subaru's Global site in the Legacy section. It appears to be a triple planetary box and the description calls it "An all new light weight design".

Maybe someone more familiar with AT design could look at the animation and render an opinion.

http://www.subaru-global.com/lineup/...egacy_special/

Last edited by fragment; 02-01-2004 at 01:26 AM.
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Old 01-30-2004, 11:41 PM   #5
555bat
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they call it the 5dat now 5 speed direct auto trans
they dont have any accumlators they yust use duty solinoids
the valve body is alot smaller and light very simple
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Old 01-31-2004, 01:16 AM   #6
fragment
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Ok, so what is the weak point of such a design? I know that planetary gearsets are by nature very strong. So, does that make clutches and actuators the bits to scrutinize?
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