amm203's '08 GT (5EAT) Build Thread

Purchased: December, 2014 with 59K miles on the clock

Color: Diamond Gray Metallic

Current Miles: 107,XXX (as of 3/19)

 

 

Engine/Exhaust/Fuel

- CNT Catted DP

- Perrin Inlet

- Perrin LW Crank Pulley

- Grimmspeed EBCS

- Grimmspeed TMIC

- AEM Fuel Pump

- Invidia Q300

- Forge BPV

- Cobb V3 AccessPort

- Group-N Motor Mounts

 

Drivetrain

- RalliTEK Tranny Mount Insert (Soft)

- Whiteline Rear Diff Inserts

- Hayden 676 ATF Cooler w/ Derale 13011 Thermostat

 

Suspension

- Koni/H&R Sport Kit

- Whiteline front and rear swaybars

- Kartboy front and rear end-links

- Whiteline Com C Top-Hats

- Whiteline Roll-Center Kit

- AVO Rear Stabilizer Mount Brace

- Aluminum front & rear Spec.B bits

 

Wheels/Brakes

- Grimmspeed Master Cylinder Brace

- Stop-Tech Street Axle Pack (Slotted rotors)

- Stop-Tech SS Lines (Pending Install)

- Summer: Enkei Raijin 18x8 w/Firehawk Indy 500s (225/40R18XL)

 

Cosmetic/Interior/Exterior

- Morimoto HID Retrofit Kit (Mini H1 7.0)

- Morimoto XB LED Fog Light Kit

- Bayson R Front Lip

- JDM Honeycomb Grille

- DAMD D-Shaped Wheel

- Grimmspeed Alternator Cover

- RalliTEK SSI Aluminum Skid Plate

- Diode Dynamics LEDs all around

 

09/2017: Engine failure (spun rod bearing) - YNANSB. Reputable engine builder did the following:

- IAG Stage 1+ Short Block

- IAG Air-Oil Separator (Street Series)

- IAG TGV Delete

- AEM Fuel Pump

- Injector Dynamics ID1050X Injectors

- Derale ATF Thermostat

- VF48 from an '18 STi

- Tuned for a little under 300WHP

 

Above mods were completed in early May. Break-in drive over the course of two weeks followed that. Car was dyno tuned 5/30/18.

Edited May 29, 2019 by amm203

Curious what that will make power wise on 91/93, plan on E85?

It will be tuned for 93 octane. I'm a little nervous to make the jump to E85 considering the 5EAT. Some say it'll hold the power while others advise against it. Good news is if I want to make the jump I'm just a tune away.

Plan on doing an additional trans cooler and/or valve body upgrade? Not sure if you had to go top feed for those injectors unless they offer side feed? Sorry for all the questions, the 5EAT is nice for a change over a manual. Clean car!

Thanks!

 

08s come with top-feeds stock. That was one of the changes from pre-facelift to the newer BL/BPs so no conversion is necessary. TGVs are being done simply because the engine is out. I was on the fence about the injector upgrade but decided to just do it for ease of tuning and raising the ceiling so to speak.

 

I already have an added cooler for the 5EAT and unfortunately there are no VB upgrades for us AT owners with 07+ LGTs

Edited November 24, 2017 by amm203

Very similar to my build - interested to see your results!

 

My 5EAT is holding up with E85, I have a Mishimoto trans cooler with a bypass thermostat. I'm sure it will need replacing eventually, everything else has

Thanks!

 

08s come with top-feeds stock. That was one of the changes from pre-facelift to the newer BL/BPs so no conversion is necessary. TGVs are being done simply because the engine is out. I was on the fence about the injector upgrade but decided to just do it for ease of tuning and raising the ceiling so to speak.

 

I already have an added cooler for the 5EAT and unfortunately there are no VB upgrades for us AT owners with 07+ LGTs

 

you'd think with the increasing amount of 5EATs's to 5MTs post 07-today, one would think valve body upgrades would be viable, more viable to the few 05-06 5EAT's out there.

 

That being said, mine has quick, firm shifts after a Tune. Even in standard form they are nice and quick and don't hang. Not sure how they are on older models? I have no idea if that has anything to do with line pressures, tunes or....

I was impressed there was virtually no slippage between gear changes with spirited driving for over 10K miles with the VF52 setup. I can't comment on the older autos but the 08s are great autos to me. Shifts were firm and seemingly quick up until the engine failure. Now, that may all come crashing down in the next 10-20K miles but I'm still pleasantly surprised this tranny has lasted 100K miles while pushing added power for 40K of them. Edited December 1, 2017 by amm203

Adding a Derale #13011 thermostat into the mix while the engine is out. Should help maintain auto-trans temps better in the cold months. God I miss this car.

Car has been completed and dyno tuned! Results attached below.

 

257WHP

297WTQ

 

Video:

I like my 5eat in the 05 with torque parameters modified in ECU.

Curious how different that is than the 07+.

Im sure the valve body swap in 05 and 06 5eat end up being slick..

I have a 08 5EAT. Are there any upgrades for this transmission to give a more aggressive shift? I know they have them for 05-07 but i cannot find anything for 08+ at least with much success. I love your build.

^yes.

 

https://www.levelten.com/subaru_upgrades_and_performance_transmissions_s/47.htm

Thanks fizzle! Besides whitetiger's suggestion, IPT is another option that I may look into when/if my 5EAT dies. I've also heard of a tuner that can do some nifty stuff with the 5EAT's TCU. I want to say he is called XRT Tuning but I have no personal experience with him. For now my 5EAT is holding up great with just the cooler/thermostat and bushing inserts as upgrades.

Awesome. Thanks guys. Mine currently has a terribly hard shift I went to the local Subaru dealer and asked them about a TCU reset and they had no idea what i was talking about. Will have to find another shop.

Quality varies wildly between Subaru shops in my area - the one I prefer noticed the service bulletin and reflashed for me without question when I mentioned the issue (hard shifts from 2nd to 3rd). ~$30 to get done. Check this out - https://legacygt.com/forums/showthread.php/lgt-08-5eat-harsh-shift-2-3-185853.html

 

Maybe printing out that service bulletin and taking it with you will help!

Edited October 19, 2018 by amm203

Installed Spec B aluminum components, Timken bearings & Whiteline bushings in the rear. Much improved ride overall!

Nice to see the AT get some love. Sub’d for inspiration.

Thanks! Should have some exciting updates coming in the next few months - an IPT 5EAT w/custom TC (currently wrapped up on a pallet) goes in this spring. Depending on how that goes, a larger turbo may be in the cards for 2021. I'm hoping to get it closer to 350-400WHP once all is said and done.

Hi OP, very clean ride

Did you have any clearance issues with the Raijins? Or is it at all close to the body with the tires you have on?

Thanks Kaos! I ran two different sets of Raijins - 18x8.5 and 18x8 (currently on the car). Both wheels had no rubbing issues whatsoever on the Koni/H&R setup. No fender rolling was required. With 225/40R-18s on the 8" wide wheels, there's about a 1-1.5 finger gap between the tires and the fender. The 8.5s were a tiny bit closer given the slightly larger diameter tire that was on them. I prefer the 8s over the 8.5s mostly due to the fact that the 8s sit perfectly flush with the fender if you look at the car down the side. 8.5s just barely poked out but it wasn't bad. Edited January 8, 2020 by amm203

Thanks Kaos! I ran two different sets of Raijins - 18x8.5 and 18x8 (currently on the car). Both wheels had no rubbing issues whatsoever on the Koni/H&R setup. No fender rolling was required. With 225/40R-18s on the 8" wide wheels, there's about a 1-1.5 finger gap between the tires and the fender. The 8.5s were a tiny bit closer given the slightly larger diameter tire that was on them. I prefer the 8s over the 8.5s mostly due to the fact that the 8s sit perfectly flush with the fender if you look at the car down the side. 8.5s just barely poked out but it wasn't bad.

 

Thanks so much.

Looking at the 8" wide and running my 235/40s. I absolutely detest rubbing issues so I appreciate the input