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5th Gen 2010 Legacy GT Motor Photos


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NF Performance is currently working on a Fifth Gen 2010 LGT and we have taken some photos along the way. They will be posted here (and more will be added along the way):

 

http://www.benjohnsonphotography.com/Cars/2010-Subaru-Legacy-GT-Photos/29394846_r2M9b7

 

http://www.benjohnsonphotography.com/photos/i-kcmNCSw/0/L/i-kcmNCSw-L.jpg

 

http://www.benjohnsonphotography.com/photos/i-WF2Knrw/0/L/i-WF2Knrw-L.jpg

 

http://www.benjohnsonphotography.com/photos/i-ZfgKwVB/0/L/i-ZfgKwVB-L.jpg

 

http://www.benjohnsonphotography.com/photos/i-6bpRqsk/0/L/i-6bpRqsk-L.jpg

 

http://www.benjohnsonphotography.com/photos/i-5pGs52N/0/L/i-5pGs52N-L.jpg

 

http://www.benjohnsonphotography.com/photos/i-g64DsLL/0/L/i-g64DsLL-L.jpg

 

http://www.benjohnsonphotography.com/photos/i-BfXPD6T/0/L/i-BfXPD6T-L.jpg

 

http://www.benjohnsonphotography.com/photos/i-fKDC2Sg/0/L/i-fKDC2Sg-L.jpg

 

http://www.benjohnsonphotography.com/photos/i-nvv8V9c/0/L/i-nvv8V9c-L.jpg

 

Thanks for looking!

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Can you take some good photos and measurements of the crankshaft pulley and belt?

Plust the key bolt that holds the crankshaft pulley in place.

 

That would help a great deal on our LWCP quest.

 

Any photos of the accessory pullies most welcome too.

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Could you please measure the following for us? I'd very much like to have this data in order to assess the performance potential for this engine vs. previous generations and the STi EJ257.

 

Combustion chamber cc.

Piston dish cc.

Deck height.

Valve diameter

Cam lift (lobe height - base circle).

Cam centerline degrees. I know this is a tough one.

 

It's not clear so far what the real compression ratio, and Subaru's own numbers aren't always that accurate. It would be interesting to know if they went with something like the B25, D25, or something totally new. We're also in the dark as to the cam design compared to the STi EJ257 dual AVCS cams, and the mapping on AVCS timing is so different.

 

I thank you on behalf of the community for going the extra mile.

Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs.
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Nice. If FuJi K the famous cylinder head nerd is in on the measurement project, this is awesome news! :)

 

http://forums.nasioc.com/forums/showpost.php?p=39795541&postcount=565

 

Do you see the 'W25' cast into the water gallery in the last photo? Seems pretty clear then that the chambers are the same as on the STi W25 head.

 

A friend of mine had his hands on a '10 shortblock and measured the piston dish at -19cc. Assuming (yes, I know) the usual 0.3mm deck height and usual gasket thickness, with the B25 / W25's 56cc chambers that would work out to a CR of 8.44:1. By the same calculation, the STi with -22cc dish comes out around 8.21:1, so it's the right ballpark.

 

I'd love to see a photo of the drive arrangement for the scavenge oil pump. It would be interesting to know if the cams are different in having something on the passenger side intake cam to drive it, for the sake of knowing if DAVCS STi cams could be used in these heads...

Edited by fahr_side
Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs.
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Nice. If FuJi K the famous cylinder head nerd is in on the measurement project, this is awesome news! :)

 

 

Yes, yes he is. That would be the "F" of NF performance. There is a reason they are one of two shops I'm willing to trust with "the other woman". :cool:

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Cam driven

 

http://i18.photobucket.com/albums/b121/FuJi_K/Engine%20rebuilds/20130512_210219_zps2ef2235d.jpg

http://i18.photobucket.com/albums/b121/FuJi_K/Engine%20rebuilds/20130512_210229_zps7dd191d1.jpg

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I'd love to see a photo of the drive arrangement for the scavenge oil pump. It would be interesting to know if the cams are different in having something on the passenger side intake cam to drive it, for the sake of knowing if DAVCS STi cams could be used in these heads...

 

 

This is from a W25 head. Passenger intake cam. you know what to make of it.

http://i18.photobucket.com/albums/b121/FuJi_K/Engine%20rebuilds/20130526_205012_zps1034bc7b.jpg

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The FSM gives the following info on the cams:

 

Intake

46.55 — 46.65 mm lobe height

Exhaust

45.85 — 45.95 mm lobe height

Cam base circle diameter:

37.0 mm (1.457 in)

 

So, lift for intake is 9.55~9.65mm while exhaust is 8.85~8.95mm. Commonly available specs for the EJ257 cams is 9.60mm lift for intake vs. 9.8mm for exhaust. So, it seems the '10 LGT motor lost quite a lot of exhaust lift in exchange for the added AVCS.

 

I wonder if dual AVCS EJ257 exhaust cams would fit the E25 heads...

Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs.
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  • 1 month later...
Forgive me for asking but what benefit would that have for us if dual avcs could be done???

 

I believe the benefit of EJ257 exhaust cams would be more power in the higher rpms.

GTEASER's 2012 Legacy GT - Sold

GTEASER's 2009 XTeaser - Sold

GTEASER's 1992 Legacy SS - Sold

 

Stapp's Law: “The universal aptitude for ineptitude makes any human accomplishment an incredible miracle.”

 

"Simple incompetence is a far more sinister force in the world than evil intent."

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