Need some Subaru Expertise.

[Brd.Prey]

Please give me your thoughts. Engine is a 2006 2.5L STI
Looking for a reasonable flat torque curve. 450 ft/lbs. 450 to 500 hp. Running 2” headers and up pipe, 72mm throttle body, ported and matched intake no TVG.

Was considering these 2 turbos.


STS Turbocharger 3" Anti Surge TD06SL2-25G 8cm for SUBARU WRX STI
Turbine Housing:8cm / AR.57
Compressor Wheel:Billet 6 + 6 Wheel
Turbine Wheel:9 Blades Wheel
Wheels Spec
- Compressor wheel: 60.2 / 78.0 mm ( Workpiece 25 g 6 + 6 blades / max Boost to 5.0bar)
- Turbine wheel: 61.0 / 54.1 mm (9 blades)
Compressor Housing
-Floor area: ap.60
- Compressor inlet: 3 " Anti-surge
-Compressor Output:
Turbines Housing
-Size of nozzle: 8 cm / ar.57
-Turbine input: for Subaru single Scrolling type
- Turbine output: for Subaru single Scrolling type
Bearing Type
-System of bearing system (high-speed bearing set)
Cooling Type
-System of oil and water cooling
Drive Pressure
- 1.0bar The drive will go with the turbo.
-We have 0.5bar, 0.8bar, 1.2bar, 1.5bar, 1.7bar and 2.0bar drives, Please add a comment to your order if you need to change it.
Boost / HP
-Max l. s .: 400 ~ 500 liters. from.
-The acceleration is limited: 2.8bar
-P3" TD06SL2-601-8cm
reposed beat: 1.5bar

OR

3" TD06SL2-601-8cm
3.15" TD06SL2-601-8cm2 Ball bearing Billet Wheel Turbo for SUBARU
APPLICATION EJ20/EJ25 IMPREZA/WRX/STI/GC8-GDB 3.15 inch Cover
ARASHI ITEM No. SU03S-03004K
REPLACEMENT For. REQUIRE EXTRA 3.15 INCH PIPE
TURBINE WHEEL TD06SL2
TURBINE DIAMETER 54/61mm(9 Blades)
TURBINE A/R 57
TURBINE NOOZLE AREA 8cm2
COMPRESSOR WHEEL 601 (Billet)
COMPRESSOR DIAMETER 59/76mm (7+7 Blades)
COMPRESSOR CFM 750
COOLING Water & Oil Cooled
BEARING Dual-row ceramic ball bearing
PACKAGE INCLUDED Gaskets , extra springs and Install Kit
FLANGE STANDARD SUBARU SINGLE SCROLL
ACTUATOR 1.1 bar spring pre-installed on adjustable actuator.(18 ways for application)
DESCRIPTION MAX HP 460+./ Brand New and Complete CHRA balanced by Turbo Technics.
*Contact us For any inquiries or special requests such as larger amount ordering

[Sgt.Gator]

I'll make the general comment that if you are installing in the stock location with the intake tube going under the intake manifold that a 3" turbo is a pain to install. I have that on my STI and I swore I would never do a 3" again in a stock location. According to the tuners I've talked with they see virtually no performance difference between a full 3", a 3" with an adapter necking down to the oem size intake, and an oem size turbo inlet at less than 450 HP. To do a 3" well you'd want to go rotated or neck it down with an adapter, which is often included in the kit. I know ATP includes them with their 3" Subaru turbo kits.

My other comment is are you sure you want 450TQ /450 -500HP? Trying to use that much power on the street, or even on a track in racing conditions, is not easy in a 2000 lb car with two wheel drive.

As for the choice of turbos, I personally stick with Garrett or Borg Warner cartridges; externally gated. Today we're first starting an Outfront closed deck 2.5 with a ATP 3576 built in externally gated turbo. I expect it will be great in my 3000 lb AWD STI, but would be too much in the 818R. And yes it has the 3" inlet, but only because I had it all left over from the prior engine and turbo. If I ever go this big again on a new build it will be rotated.

[Brd.Prey]

Thanks for replying, Yes it will be rotated, I decided after hearing no response that I would go one step smaller in a TD06 20G ball bearing gtx wheel so MAX 420hp. I figured this would come in sooner and give me the flat torque curve I am looking for. As this is a track car I can always pull power but I cant add it easily so to speak. Plus I am planning on having traction control with the Haltech ECU.

[grabera7]

Gator, was that even with the large "phenolic spacers" on the intake manifold? I believe those help with the larger inlet.

[Brd.Prey]

Gator, was that even with the large "phenolic spacers" on the intake manifold? I believe those help with the larger inlet.
I too have those spacers. I miss wrote I ordered the TD06SL2 20G 11blade GTx
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[Sgt.Gator]

Gator, was that even with the large "phenolic spacers" on the intake manifold? I believe those help with the larger inlet.

Yes. In fact I don't think it's possible without them. If you use the 3" special offset silicone hose from Agency Power it's easier. But I still wouldn't do it again. Plus the 3" bend at the power steering pump is another problem, but obviously not on a manual rack 818.
The hose: https://www.agencypower.com/agency-power-3in-offset-turbo-inlet-coupler-subaru-wrx-sti-forester-p-95903.html

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