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Old 11-30-2022, 01:28 PM   #1
dlsteffen
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Member#: 494009
Join Date: Nov 2018
Location: CA
Vehicle:
2008 LGT

Default Ej25 G35-900 E85

Event: Dyno pull
Location: Auburn, CA
Ambient Temp: 66F
Elevation: ~1200'
Tires: PS4S 245/40/17

Car: 2008 Legacy GT
Tuner: Travis Barnes
Dyno Info: Mustang
Transmission: stock 6spd
Gear: 4th
Peak HP at RPM: 605 @~6100
Peak Torque at RPM: 531 @ ~5900
Baseline hp/tq for a stock on same dyno: less than dynojet
Target Boost: 30
Fuel: E85
Dotted line is 18psi on E85(475hp/424tq)

Engine/Power Modifications:
Darton sleeved EJ25(+2mm rod length engine)
V25 heads(kelford 199b camshafts,+1mm ferrea valves,~8.7.1 compression)
Garrett G35-900 1.01 A/R housing
KillerB Holy Header
ETS Rotated Turbo Kit
3.5" ETS front mount
Turbosmart 44mm Hypergate EWG
Turbosmart Raceport BOV
ID 2000 injectors
ID F750 Fuel filter
Radium engineering dual Walbro 450s
Aeromotive A1000 fpr


Future Plans:
Currently Working on another set of heads which will raise the compression of the engine. I will also be putting in larger camshafts(gsc 272's). I will likely move to an .83ar turbine housing. Believe it or not this is my daily driver.
I will also be turning up the boost because why not.

I hope this info is beneficial to you. There was not much public info regarding G35 turbos for Subarus when I decided to go that route. Feel free to comment or ask questions.

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Last edited by dlsteffen; 11-30-2022 at 01:35 PM.
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Old 11-30-2022, 03:02 PM   #2
K3rm1tth3fr0g
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Member#: 508105
Join Date: Nov 2019
Chapter/Region: NWIC
Location: Greater Seattle Area
Vehicle:
Link G4X flex tuned
02' EJ205 20G 6MT wagon

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Nice numbers! And on a sleeved non closed-deck engine?

Post a pic of your ride if you've got one, I love a good Legacy.

Definitely seems the G35 with that big A/R really wants to be able to rev out past 6700 - those 199Bs are certainly some decent cams.

Hope the new heads turn out well, I'm sure it will change the powerband a lot.

Was this a flex tune or pure E85?

Edit: I see you're going to step down to a .83 which I understand, though with some big cams and a big A/R that G35 would be real happy.
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Old 11-30-2022, 03:40 PM   #3
dlsteffen
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Thanks man. I'm my opinion there is no need for closed decking when you have a sleeved engine. Just make sure the engine builder knows what they're doing.
The dyno pull definitely is cut short I, would like to see what's going on at 7500rpm. Probably could play with boost controller and have it remain flat once it's retuned.
This was a cobb flex fuel tune but once you experience e85 you never want to go back car made 424whp @14psi on 91 octane, I wasn't interested in pushing any more than that.
Car is laggy which is why I'm considering that .83a/r housing but we'll see, it's definitely satisfying above 5k.


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Last edited by dlsteffen; 12-01-2022 at 11:34 AM.
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Old 11-30-2022, 03:53 PM   #4
K3rm1tth3fr0g
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Link G4X flex tuned
02' EJ205 20G 6MT wagon

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Quote:
Originally Posted by dlsteffen View Post
Thanks man. I'm my opinion there is no need for closed decking when you have a sleeved engine. Just make sure the engine builder knows what they're doing.
The dyno pull definitely is cut short I, would like to see what's going on at 7500rpm. Probably could play with boost controller and have it remain flat once it's retuned.
This was a cobb flex fuel tune but once you experience e85 you never want to go back car made 424whp on 14psi on 91 octane, I wasn't interested in pushing any more than that.
Very nice looking car! RPF1s wrapped with PS4Ss is my summer setup of choice as well.

I don't necessarily agree with that regarding closed decking being overkill, I am not a huge fan of sleeving or pinning, but I do hope for a long life for your motor.

I'd look into Cobb's upgraded EWG line kit or just upgrade the fittings and line DIY. The cleaner vacuum and boost signal and the bigger diameter fuel hose aid in tuning.

Quote:
Car is laggy which is why I'm considering that .83a/r housing but we'll see, it's definitely satisfying above 5k.
That's certainly the trade off you make with the G35, and even more so with your large A/R and cams (though they are fairly mild). I bet a G30 900 in this setup would hit your spool and power targets a bit better, but decisions like that are easy in hindsight.
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Old 12-01-2022, 02:18 AM   #5
Bariga
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07 STi Limited
EFR 8474 TS EWG

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nothing wrong with your heads, your just out of turbo. I would slap 1050 on it and keep same hotside
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Old 12-01-2022, 07:44 AM   #6
K3rm1tth3fr0g
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Member#: 508105
Join Date: Nov 2019
Chapter/Region: NWIC
Location: Greater Seattle Area
Vehicle:
Link G4X flex tuned
02' EJ205 20G 6MT wagon

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Quote:
Originally Posted by Bariga View Post
nothing wrong with your heads, your just out of turbo. I would slap 1050 on it and keep same hotside
His setup is already laggy as is

And a powerband that isn't close to 3000RPM wide really sucks to drive... This thing needs to rev out but I don't think it's out of turbo

Last edited by K3rm1tth3fr0g; 12-01-2022 at 08:21 AM.
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Old 12-01-2022, 08:52 AM   #7
user1029
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HTA86 E85 Kel272s Cos IM

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https://forums.nasioc.com/forums/showthread.php?p=46740326

Yup go down to .82 housing (thatís the house Iíve always stuck with across all turbos), rev it out to 8000, and may consider ETS max flow header.Also consider switching to Xona 7864S with their UHF turbine. I have 3500rpms of powerband with more than 800 whp the dual AVCS also helps with spool up
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Old 12-01-2022, 09:11 AM   #8
K3rm1tth3fr0g
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Link G4X flex tuned
02' EJ205 20G 6MT wagon

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Also look into KBs big tube header. I want to see what it can do with a big g series.

They said around 600WHP is where is starts to help. Though it does slightly hurt spool.
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Old 12-01-2022, 10:57 AM   #9
dlsteffen
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Quote:
Originally Posted by Bariga View Post
nothing wrong with your heads, your just out of turbo. I would slap 1050 on it and keep same hotside
you're right there is nothing wrong with the heads. Do you want to buy them back?
I may be out of turbo but there is still power left on the table, at least another 10psi worth of boost.
In an ideal world where I don't have to deal with legacy axles breaking I would probably have two different turbo setups, one for the street and one for the track. In that case I would have ran a g35-1050 and a g30-770. Cba switching turbos though, even if they are v-band connections.
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Old 12-01-2022, 11:18 AM   #10
dlsteffen
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Quote:
Originally Posted by K3rm1tth3fr0g View Post
Also look into KBs big tube header. I want to see what it can do with a big g series.

They said around 600WHP is where is starts to help. Though it does slightly hurt spool.
I called them and asked about the Max VE header for my application and they told me it shift the curve to the right. It probably would make more power but it would affect the boost threshold which is what I'm trying to gain back as I do like to track the car.
It may end up hurting more than anything because of turbulence. The secondary is 2.5" and the ETS uppipe is 2.375" O.D.
Let me know if you know any company that makes 2.5" upipes with a v-band turbo connection.
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Old 12-01-2022, 11:55 AM   #11
KillerBMotorsport
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Raising boost isn't going improve the bottom-end any appreciable amount. A smaller turbine housing will choke flow up top. I say you lose +30whp and you have increase power taper getting into the higher RPMs; it won't make power as far into the upper RPMs. Maybe lose 300-400 off the top. EJ25s always perform best when the turbo's are somewhat unbalanced; bigger turbine, smaller compressor. So if you want more power, you need to upsize the turbo. This route would also play well with improving flow characteristics of the heads. More response, I'd drop a size and go with the biggest A/R turbine.
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Old 12-01-2022, 01:14 PM   #12
Bariga
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EFR 8474 TS EWG

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Quote:
Originally Posted by dlsteffen View Post
you're right there is nothing wrong with the heads. Do you want to buy them back?
I may be out of turbo but there is still power left on the table, at least another 10psi worth of boost.
In an ideal world where I don't have to deal with legacy axles breaking I would probably have two different turbo setups, one for the street and one for the track. In that case I would have ran a g35-1050 and a g30-770. Cba switching turbos though, even if they are v-band connections.
Awesome you got my heads!
Before you dump more money get back pressure sensor in header and get turbo speed sensor this 2 things will tell you what you need to do and stop guessing
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Old 12-01-2022, 03:05 PM   #13
dlsteffen
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Quote:
Originally Posted by KillerBMotorsport View Post
Raising boost isn't going improve the bottom-end any appreciable amount. A smaller turbine housing will choke flow up top. I say you lose +30whp and you have increase power taper getting into the higher RPMs; it won't make power as far into the upper RPMs. Maybe lose 300-400 off the top. EJ25s always perform best when the turbo's are somewhat unbalanced; bigger turbine, smaller compressor. So if you want more power, you need to upsize the turbo. This route would also play well with improving flow characteristics of the heads. More response, I'd drop a size and go with the biggest A/R turbine.
thanks for the input.
My idea of raising the boost was to compensate for loss of peak HP by switching to the smaller turbine housing.
sounds like I need 1.21 A/R housing
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Old 12-01-2022, 03:54 PM   #14
K3rm1tth3fr0g
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Link G4X flex tuned
02' EJ205 20G 6MT wagon

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Quote:
Originally Posted by dlsteffen View Post
thanks for the input.

My idea of raising the boost was to compensate for loss of peak HP by switching to the smaller turbine housing.

sounds like I need 1.21 A/R housing
The big housing isn't going to help lag, it's going to give you a more linear powerband.
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Old 12-04-2022, 07:08 PM   #15
wuuusaa
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silver duh

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I'm local to Snail Performance as well. I've heard from other guys who has tuned their cars well how conservative Travis can be as a tuner especially if M45 didn't build the car.

Nonetheless very healthy numbers, I think you have plenty of room life as well as mentioned. Turn that Bish up!!

Any videos of the car in action?
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Old 12-06-2022, 10:28 AM   #16
dlsteffen
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Quote:
Originally Posted by wuuusaa View Post
I'm local to Snail Performance as well. I've heard from other guys who has tuned their cars well how conservative Travis can be as a tuner especially if M45 didn't build the car.

Nonetheless very healthy numbers, I think you have plenty of room life as well as mentioned. Turn that Bish up!!

Any videos of the car in action?
Unfortunately not, I only witnessed one WOT pull on the dyno and was not recording at the time.
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Old 12-06-2022, 07:48 PM   #17
Fierysun
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Quote:
Originally Posted by dlsteffen View Post
Thanks man. I'm my opinion there is no need for closed decking when you have a sleeved engine. Just make sure the engine builder knows what they're doing.
The dyno pull definitely is cut short I, would like to see what's going on at 7500rpm. Probably could play with boost controller and have it remain flat once it's retuned.
This was a cobb flex fuel tune but once you experience e85 you never want to go back car made 424whp @14psi on 91 octane, I wasn't interested in pushing any more than that.
Car is laggy which is why I'm considering that .83a/r housing but we'll see, it's definitely satisfying above 5k.

Has the issues with sleeves dropping in Subaru blocks been resolved?

It was a big problem before, hence closed decks was (still is?) the more desirable choice.
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Old 12-08-2022, 08:13 PM   #18
subaru_gc8
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Quote:
Originally Posted by dlsteffen View Post
thanks for the input.
My idea of raising the boost was to compensate for loss of peak HP by switching to the smaller turbine housing.
sounds like I need 1.21 A/R housing
the best advice i can give you on bigger turbos is learn to drive in the upper portion of the rpm range, learn where the turbo really starts to make power and just learn to keep it there. most turbos only make power in a 3000-4000 range. so the best you can do is to know where that is and keep it around that range. driving a bigger turbo is different than driving a small turbo
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