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TOMEI

Tomei ARMS T390M TURBINE KIT EJ SINGLE SCROLL for JDM: GDB A-B/GDA A-G/GRF/GVF & USDM: WRX 01-07/WRX STI 04+

Tomei ARMS T390M TURBINE KIT EJ SINGLE SCROLL for JDM: GDB A-B/GDA A-G/GRF/GVF & USDM: WRX 01-07/WRX STI 04+

SKU: 173034
£1,515.88
£1,515.88
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New option of performance turbo for EJ Single Scroll!

The all new T390M turbo kit designed to best perform especially with EJ20 Single Scroll.
It comes with the same billet compressor wheel as the existing T440M turbo but covers wider range of different needs while the T440M turbo kit is mainly for tuned EJ25 and long-stroked EJ22/EJ26.

PRODUCT INFO

APPLICATION TYPE P/N NOTES
EJ20/25 Single Scroll
※Please see the table below.		 T390M 173034 ・TOMEI Turbo Suction Hose is also required on Impreza (GD#) and Forester (SG9).
・GDB Inetrcooler Duct (Subaru P/N: 21830AA102) is also required to install this turbo kit on Impreza (GDA) or Forester (SG9).
・Can be installed also to GC8 by upgrading the turbo suction hose to a product with ID: 60mm at the turbo side end.
T440M 173030

FEATURE / SPEC

【Application】
IMPREZA JDM FORESTER
GC8 GDA GDB GR/GV SG9
A-G AB A-LINE
EJ207 EJ205 EJ207 EJ257 EJ255

IMPREZA USDM WRX
GD 01-03 GD 04-05 GD 06-07 GR 08- GV 11- VA 15-
WRX WRX STI STI STI STI STI
EJ205 EJ205 EJ257 EJ257 EJ257 EJ257 EJ257


T390M


Well tuned low-mid torque that 2.0L engine can spool up smoothly to the high end range.
Stress-free and easy drivability from the street to sport driving on small tracks.

T440M


Dynamic power and torque at the mid-high RPM range.
T440M is designed for steady boost even at the high end range where the stock turbo of EJ application is known to fade from around 5,500RPM.
Steady boost at the high RPM range is an essential key for tuned EJ motor.

NEW HOUSING FOR MORE EFFICIENCY


Redeveloped from the material for more efficiency to convert the energy straight to power with better lubrication and cooling.

FLOATING METAL

Reinforced actuator
High quality floating journal bearing at the center shaft. Remarkable stability under high boost.

BOLT-ON APPLICATION


The ARMS series turbo kits all come supplied with all the required gaskets and fitting, no modifications required.

1 YEAR WARRANTY


The T390M/T440M Turbo Kit comes with a 1 year limited warranty after purchase.


SPEC

  • COMPRESSOR WHEEL DATA
    •
    TRIM INNER DIA. OUTER DIA. BLADES
    ARMS T390M 60 52.6 68.0 6/6
    ARMS T440M 56 56.2 75.0 6/6
     The all new, forged aluminum billet compressor wheel increases even more efficiency and at the same time reduces surging that is one of the well known problems on tuning especially with AVCS applications.

  • TURBINE WHEEL DATA
    •
    TRIM OUTER DIA. EXIT DIA. BLADES
    ARMS T390M 76.9 56.0 49.1 12
    ARMS T440M 77.4 61.5 54.1 11

    DATA

  • 【T390M+EJ20 S/S】Superior balance of response and power
    • Well balanced for quick response from the low range to the top power at the high RPM range!


  • 【T440M+EJ22 S/S】Outstanding peak power and performance
    • Simply for more power making the most of EJ22.The dynamic acceleration is like a beast.

  • 【T440M+EJ25 S/S】Torquey and powerful
    • Fat and pushing torque with a whole different level of power from the large displacement.

    Steady boost at all range


    Quick spool eliminating turbo surging, superior smoothness straight up to the high end RPM range.
    SETTING GUIDE
    ITEM RECOMMENDED SETUP
    BOOST SETTINGS STOCK ENGINE:1.2㎏/cm² (17.07psi） With Boost Controller
    Engine Tuning with a 2.2L, 2.5L, 2.6L Base: 1.4-1.5㎏/cm² （19.9-21.3psi）With Boost Controller
    Approx. around 1.2㎏/cm2 (17.07psi） boost and around 350ps is the maximum with a full stock engine considering capacity of the stock head gaskets and the other stock internals.
    The turbo is designed to be able to go up to 1.5kg/cm2 (21.3psi) when combined with forged pistons, forged H-beam conrods and other required parts described in this section.
    However the maximum boost the engine can withstand widely varies depending on engine condition etc.
    Boost setting should only be performed when the gear is in 4th or 5th gear as it could cause unexpected high load and a higher boost than desired in higher gears if the setting is performed in a lower gear.
    ACTUATOR SETTINGS Not Required since a boost controller is to be used.
    The wastegate actuator has been pre-set from factory and no further adjustment is required in most cases.
    It is recommended to use a boost controller along with T440M Turbo which helps to maintain stable boost and allows to adjust overall feeling.
    Adjustment of the wastegate actuator should usually only be performed as a sub-adjustment to help boost controller adjustment.
    TARGET POWER STOCK ENGINE:350PS
    Engine Tuning with a 2.2L, 2.5L, 2.6L Base: 390PS(T390M)/440PS(T440M)
    Approx. around 1.2㎏/cm2（17.07psi） boost and 350ps is the maximum with a full stock engine. It is highly recommended to use forged pistons / conrods and a reinforced head gasket when set the boost to 1.5㎏/cm2. Read carefully and follow the following setting guides with a modified engine, especially with a stroker engine with 2.2L or more in displacement to let the turbo properly perform.
    PISTONS STOCK ENGINE:RECOMMENDED/TOMEI FORGED PISTON KIT
    Engine Tuning with a 2.2L, 2.5L, 2.6L Base: FORGED PISTONS RECOMMENDED/TOMEI FORGED PISTON KIT
    The stock pistons can only withstand up to approx. around 350PS and forged pistons are required from this power level and higher. The stock pistons will likely fail due to a significantly higher combustion pressure and pre-ignition caused by them if run 1.4-1.5kg/cm2 (19.9-21.3psi), the designated boost amount to achieve the full performance of TOMEI Turbo. Forged pistons along with reinforced head gaskets are required to make the most of the performance of TOMEI Turbo
    CONRODS STOCK ENGINE:RECOMMENDED/TOMEI H-BEAM CONRODS
    Engine Tuning with a 2.2L, 2.5L, 2.6L Base: H-BEAM CONRODS RECOMMENDED/TOMEI H-BEAM CONRODS
    The stock connecting rods are one of the weak points of the EJ series engine. When aiming for more than 350PS, then it is highly recommended to upgrade the conrods to stronger forged conrods.
    CAMSHAFT Recommended: TOMEI PONCAM
    The stock camshafts are inadequate to obtain sufficient exhaust pressure to spool a larger turbo.
    Upgrading camshafts helps spooling the turbo quicker from lower rpm, as well as spooling up at high rpm range that pulls the true performance of T440M Turbo and gives even more peak power as a result.
    HEAD GASKET STOCK ENGINE:STANDARD RECOMMENDED:TOMEI METAL HEAD GASKET
    Engine Tuning with a 2.2L, 2.5L, 2.6L Base: CHANGE TO METAL TYPE RECOMMENDED:TOMEI METAL HEAD GASKET
    Although the stock head gaskets of EJ series engines are metal type gaskets, there is still a good chance of being blown under high boost due to significantly increased combustion pressure than they are designed to deal with, that can be prevented by evenly stabilize the deck surface pressure using reinforced gaskets. Choose gasket thickness to achieve desired boost setting and compression ratio to suit each set up
    INJECTOR SIZE STOCK ENGINE:650cc or Higher
    Engine Tuning with a 2.2L, 2.5L, 2.6L Base: 750cc or Higher
    Required injector capacity to suit each setup can be calculated as follows. Target Power(HP) x 5.9 ÷ No. of Cylinders =injector volume (cc) required per cylinder.
    10-20% higher volumed injectors than the amount calculated above is recommended to obtain ideal spray on high rpm range.
    FUEL PUMP Recommended: TOMEI 255 /h
    Required fuel pump capacity to suit each setup can be calculated as follows.
    Injector volume (cc) x No. of Cylinders x 0.06 = Fuel Pump flow rate (L/h) required for the system.10-20% higher rated fuel pump than the amount calculated above is recommended to stabilize the fuel pressure at all time.
    FUEL PRESSURE REGULATOR Adjustable Regulator required. RECOMMENDED ：TOMEI type-S
    Adjusting fuel pressure is required when fuel pump is upgraded.The fuel pressure should usually be adjusted to 3kg/cm2 under the atmosphere pressure.
    AIR FILTER HIGHT FLOW TYPE
    Higher flowing, less restrictive air filter is recommended for a better performance.
    MAF SENSOR STOCK ENGINE:STANDARD MAF / MAF LESS SETUP
    Engine Tuning with a 2.2L, 2.5L, 2.6L Base:MAF LESS SETUP
    The stock MAF sensor supports up to approx. around 400PS.
    EXHAUST MANIFOLDS TOMEI EXHAUST MANIFOLDS or Similar
    The increased exhaust pressure at exhaust manifold, that is increased by upgrading the camshafts, now should be efficiently lead to the turbo for the best performance. The smoother the pressure goes into the turbo, the quicker the turbo spools. On EJ series engine however, too thick pipe diameter to the turbo actually results a poor response because of the long distance from the engine exhaust ports to turbo. Equal -lengthed exhaust manifold may require the oil pan to also replace on models with factory unequal-lengthed exhaust manifold.
    TURBO OUTLET
    METAL CAT / FRONT PIPE    		 RECOMMENDED: METAL CAT PIPE DIAφ70～φ76.3
    The stock exhaust components, turbo outlet – catalyzer – front pipe, are definitely not ideal setup when seek more performance due to their restrictive design. Decreasing restriction in the system, equals increasing exhaust flow capacity, helps to release back pressure at the turbo quicker. This stabilizes boost, increases turbo efficiency and thus allows higher boost setting.
    EXHAUST Recommended: Main Pipe φ80
    By using a similar sized pipe (φ80～90mm), the exhaust gas flow will be smoother, this will greatly aid to maximize exhaust flow and to prevent any performance restrictions.
    SUCTION PIPE STOCK ENGINE:REQUIRED (CERTAIN MODELS ONLY) / RECOMMENDED：TOMEI SUCTION HOSE
    Engine Tuning with a 2.2L, 2.5L, 2.6L Base:REQUIRED: TOMEI SUCTION HOSE
    The stock turbo suction pipe can be deformed and decrease air flow efficiency under high pressure that it’s not designed to deal with. Upgrading the turbo suction pipe is very effective especially on EJ series engine, however due to the high effectiveness, it is recommended to tune the ECU to match the increased air inlet and the MAF sensor when the turbo suction pipe is upgraded.
    INTERCOOLER STOCK ENGINE:UPGRADE RECOMMENDED
    Engine Tuning with a 2.2L, 2.5L, 2.6L Base:UPGRADE RECOMMENDED
    Compressed air from the Turbo goes into the engine. This process increases the air temperature and lowers density of oxygen in the same volume of air that also lowers the combustion efficiency. Supplying the compressed and well cooled air by a better radiating intercooler increases the combustion efficiency that results a better performance and more power.
    BLOW OFF VALVE
    (Recirculation Type)    		 Recirculation type of blow off valve is required.
    Delete the stock air relieve valve system.
    Without a blow of valve, the compressed air from the turbo when the throttle is suddenly closed would have no where to go and excessively stress the turbo due to a force then generated and tries to stop the turbo from spinning at a very high rpm, The blow off valve protects the turbo, however the stock blow off valve tends to keep releasing boost under high boost and it causes poor response and less peak power. It is not recommended to use a vent-to-atmosphere type when MAF sensor is used for engine management as it causes the ECU not being able to obtain the correct air mass readings that leads to improper A/F ratio.
    ENGINE MANAGEMENT Optimize the Engines Setup
    ECU tuning to suit each setup is required to optimize the performance and fuel efficiency as well as to protect the engine.
    PLUG UPGRADE REQUIRED Recommended: 8~9 Heat Range
    The stock spark plugs are too low on their heat value for the increased combustion temperature that may cause preignition and cause the spark plug electrodes to melt down and pistons to seize / erode.Recommended plug heat value is usually 8-9, however, the best setup varies engine to engine depending on usage,condition etc.
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