5eat build

[Libacy GT]

Hi

been lurking the forum for a while now and got in touch with some extremely knowledgeable people who have helped me alot. Fahr_side and hex mods being a couple of them. Legacy forum is way ahead then the Liberty forum when it comes to the 5th Gen Gt and modding.

 

Im from Australia and have a 2010 Legacy/Liberty Gt 5EAT. I currently have a built engine installed rated for about 500hp and plan to reach about 440hp soon (currently just with stock turbo and about 240hp to protect tranny as its already showing signs of slippage!) but my major concern to get to the limits of the engine is the auto transmission. To my knowledge noone in Australia has built a 5th Gen Auto or even taken a 5th Gen Auto to over 270hp, so the limits are an unknown . I cannot find anything at all online from anyone who has a built 5th Gen Auto and all the shops over here are unfamiliar with the limits of these boxes and are not confident to build one for me.

 

My question is. Does anyone on this forum have or know of someone who has a built 5th Gen Auto pushing big power?

Its been a nightmare trying to get info on these boxes and what can be done to them, As far as im aware they are not the same as the 4th Gen 5EAT where many have done a full rebuild including Valve body mods.

 

As far as i know as well, to convert to an STI manual 6 speed will practically not work without major engineering and issues with electronics and not as easy as the 4th Gen conversions.

 

your help will be appreciated.

 

 

Sorry if this post is in the wrong forum.

 

Thanks

niz

[Mrstacy]

There's a few threads.

 

http://legacygt.com/forums/showthread.php/whats-most-power-out-4eat-5eat-legacy-youve-heard-abouti-156881.html?t=156881&highlight=5eat+400hp

 

http://legacygt.com/forums/showthread.php/5eat-performance-22223.html?t=22223&highlight=5eat+400hp

 

http://legacygt.com/forums/showthread.php/whats-max-hp-torque-5eat-can-handlei-1132.html?t=1132&highlight=5eat+400hp

 

http://legacygt.com/forums/showthread.php/much-hp-automatic-tyranny-good-06-legacy-gti-63161.html?t=63161&highlight=5eat+400hp

[Libacy GT]

There's a few threads.

 

http://legacygt.com/forums/showthread.php/whats-most-power-out-4eat-5eat-legacy-youve-heard-abouti-156881.html?t=156881&highlight=5eat+400hp

 

http://legacygt.com/forums/showthread.php/5eat-performance-22223.html?t=22223&highlight=5eat+400hp

 

http://legacygt.com/forums/showthread.php/whats-max-hp-torque-5eat-can-handlei-1132.html?t=1132&highlight=5eat+400hp

 

http://legacygt.com/forums/showthread.php/much-hp-automatic-tyranny-good-06-legacy-gti-63161.html?t=63161&highlight=5eat+400hp

 

 

thanks for your reply, im referring specifically to the 5EAT from the 5th Gen legacy gt's . From what i understand they are different to the 5EAT 4th Gen.

Would like to see if someone has built a 5th Gen Auto and what power they are running. I think there is also no known mods for the 5th Gen valve body.

[FLlegacy]

The USA 5th gen gt only came in 6mt not an auto, unfortunately. This turbo setup would have been perfect for those long gears. You should try getting a hold of Xrt tuning he works a lot with the 5eat on the 3.6 model maybe he has some better insight into what it will hold or someone who has modded them for more power.

 

Best I recall somewhere around 350 lbft the trans starts slipping.

[Libacy GT]

The USA 5th gen gt only came in 6mt not an auto, unfortunately. This turbo setup would have been perfect for those long gears. You should try getting a hold of Xrt tuning he works a lot with the 5eat on the 3.6 model maybe he has some better insight into what it will hold or someone who has modded them for more power.

 

Best I recall somewhere around 350 lbft the trans starts slipping.

 

thanks, is xrt tuning his forum name? right, i forgot the USA 5th GEN didn't come with AUTO,

 

Hows the rep with IPT on this forum? Any good? They built alot of 4th Gen boxes didn't they?

[FLlegacy]

Check in this part of the forum and ask a few of the long time members about the differences in the 5eat in the newer gens.

 

http://legacygt.com/forums/forumdisplay.php/transmissions-79.html

 

I haven't heard a lot about IPT except I believe they are the only shop that messes with the 5eat at all.

[Libacy GT]

Check in this part of the forum and ask a few of the long time members about the differences in the 5eat in the newer gens.

 

http://legacygt.com/forums/forumdisplay.php/transmissions-79.html

 

I haven't heard a lot about IPT except I believe they are the only shop that messes with the 5eat at all.

 

 

ill have a close look at the transmission forum, ive also posted in the 4th GEN forum.

Thanks for your help.

[Zee199969]

Here's an EDM 5EAT build, not sure if fahr_side already mentioned this to you: http://legacygt.com/forums/showthread.php/eleguas-badass-br9-wagon-241754.html?t=241754&highlight=elegua

[Humble Rumble]

As far as I know, the 5EAT can handle about 400 hp/tq before needing to address resilience issues. Granted, we only have the 5th gen 5EAT in the 3.6R in the states, but italianlegacy36r has his 3.6R supercharged and built running about 400 hp/tq on the stock 5EAT as far as I know. His is currently the highest powered 5th gen 5EAT in the US to my knowledge.

[GTEASER]

The STi 6MT is not that impossible. This guy is doing it himself in his garage. When he gets it done and proves it, he may be interested in building engine/tranny mounts for others, or at least make his design available.

 

http://legacygt.com/forums/showthread.php/brendans-sti-6mt-swap-258954.html

[Libacy GT]

Here's an EDM 5EAT build, not sure if fahr_side already mentioned this to you: http://legacygt.com/forums/showthread.php/eleguas-badass-br9-wagon-241754.html?t=241754&highlight=elegua

 

Yes i have seen that thread, but he didn't build the Tranny, seemed to handle close to the 400hp mark but i believe they did not run it very long at that power level, but he sold the car before they can turn it up a notch as well.

with my auto already slipping on second i can no way get even close to that. Have to do a rebuild,

[Libacy GT]

The STi 6MT is not that impossible. This guy is doing it himself in his garage. When he gets it done and proves it, he may be interested in building engine/tranny mounts for others, or at least make his design available.

 

http://legacygt.com/forums/showthread.php/brendans-sti-6mt-swap-258954.html

 

but his car is the manual from factory , correct? as he is in the US. The auto platform will be different. So the STI swap will not be the same.

[FLlegacy]

The physical parts will be the same, in fact your driveshaft may not need to modified at all. But the TCM/ECU will be a chore I am sure. Have you tried contacting any performance subie shops close to you? MRT performance I believe has a youtube channel with lots of great information maybe they could help you out with some advice or information.

[cww516]

Definitely check out ItalianLegacy's build thread (clicky)- as Humble Rumble said, he's up there power-wise, and I remember he had some trials and tribulations with the transmission. Most of what I remember was related to keeping the fluid cool, but I'd imagine there's a bunch of pertinent info in there if you haven't read that thread already.

[Libacy GT]

The physical parts will be the same, in fact your driveshaft may not need to modified at all. But the TCM/ECU will be a chore I am sure. Have you tried contacting any performance subie shops close to you? MRT performance I believe has a youtube channel with lots of great information maybe they could help you out with some advice or information.

 

MRT are a no go for us over here, very bad experiences with them.

Yes i have contacted all the main guys over here, they basically say its an unknown and they don't want to experiment, and ive spoken to some of the best subaru specialists over here.

[Libacy GT]

Definitely check out ItalianLegacy's build thread (clicky)- as Humble Rumble said, he's up there power-wise, and I remember he had some trials and tribulations with the transmission. Most of what I remember was related to keeping the fluid cool, but I'd imagine there's a bunch of pertinent info in there if you haven't read that thread already.

 

thanks, just read the thread. From what i read, he is only at about 300hp. The tranmission issue was his car going into limp mode possible from overheating of trans fluid.

 

He hasn't updated the thread in quite a long time. Ive Pmed him to see where he is at with it.

 

EDIT: actually just saw the youtube video of italianlegacys car, hes at around 400hp, will be interesting to see what hes done to the transmission and how similar it is to the 5th GEN GT 5EAT. However im thinking that a supercharger and his 6 cylinder just has a different power delivery to a turbo 4 cylinder, i think the turbos have a more aggressive torque delivery, so not as forgiving on the tranny.

[Timothy.B]

I would definitely recommend getting a hold of Ed from XRT. I've been helping with adjustments to the current ROM's involving the 5EAT lately on the 3.6R and it's been blast. I don't know of anyone else that goes in depth as much with tweaking ECU maps that control shifting. I've seen him improve upon the shifting after a VB upgrade on an older 5EAT.

 

Here's a message directly from Hexmods:

 

I received a great question:

 

Do you have an idea of what this [5EAT] transmission and diff can handle? I'm wanting to push it but reliability is still a must for me.

 

The Answer:

 

The reliable power levels all depend on how much you're willing to spend, and what fuel you're willing to use (E85 or Gasoline).

The following numbers are for gasoline:

-300whp/wtq can be done safely with the right tuner, and is a lot of fun to drive.

-350whp/wtq can be done reasonably safely if your engine tuner is quite good and doesn't squeeze ignition timing, but a good bit more research and preparation is required.

-400whp/wtq can eventually lead to needing a built engine, but the transmission itself can handle it. This is about the limit for 5EAT to provide reasonable longevity (relative to 400whp). Yes, the 5EAT can handle a lot!

-450whp/wtq is a major undertaking, most likely won't be reliable, and will be hard on the stock clutch packs, resulting in dramatically short transmission life. This level would require a good bit of discussion, but several customers have met or exceeded this level and are enjoying the heck out of their cars.

 

For these levels 300-400whp/wtq, the 5EAT recipe is the same:

1) You will need a valve body upgrade, no question.

2) Some cars run hot, some do not. If yours does (above 200*F) then a transmission cooler is essential.

3) If you launch occasionally but not brutally, center differential bulletproof bushings will increase your margin of safety considerably. However, the center differential can still break with enough repeat abuse, which isn't hard to do. It fails from fatigue, not usually from single stress events, thus:

4) A Center Differential Upgraded Gears kit can allow you to really hammer on launches. But beware, with a great enough quantity of drag races or other abusive driving, even this can eventually break. When a center differential breaks (and I've seen a lot break), it sometimes causes other damage throughout the transmission, and is not cheap to fix.

 

You can see the theme here. Launching (and other repeated stresses to the center diff) is not recommended.

Everything else is encouraged.

 

Sincerely,

David Hettena

 

I don't believe there to be a valve body upgrade for this gen 5EAT. Also, unsure if there is a center diff gear upgrade for this 5EAT either. Ed's about to start work on a 2011 Liberty GT 5EAT. Should be interesting. The stock LGT 5EAT is pretty quick stock.

[Libacy GT]

I would definitely recommend getting a hold of Ed from XRT. I've been helping with adjustments to the current ROM's involving the 5EAT lately on the 3.6R and it's been blast. I don't know of anyone else that goes in depth as much with tweaking ECU maps that control shifting. I've seen him improve upon the shifting after a VB upgrade on an older 5EAT.

 

Here's a message directly from Hexmods:

 

 

 

I don't believe there to be a valve body upgrade for this gen 5EAT. Also, unsure if there is a center diff gear upgrade for this 5EAT either. Ed's about to start work on a 2011 Liberty GT 5EAT. Should be interesting. The stock LGT 5EAT is pretty quick stock.

 

 

thanks, i will get in touch with him, yeh there is no upgrade for centre diff and valve body for 5th Gen Gt and i think even the 08+ gt does not have any VB Mods.

 

Ive checked most of the parts of the tranny from the 4th Gen and 5th Gen and they are mostly the same except for valve body, Torque converter, centre diff intermediate shaft, front planetary , & input clutch