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CYLINDER HEAD COMPONENTS

RB26 V CAM SYSTEM (VALCON TYPE-RB26)

Variable Valve Timing System allows the classic RB26 to become a new generation engine. "V CAM SYSTEM" & "VALCON type RB26" are combined as an affordable set!!

STEP1

Features
  • The intake cam side of the RB26DETT is changed to allow variable valve timing. The cam has duration of 248° which seem a little conservative. However, with the variable timing, power increases can be found at low or high RPM
  • Whether you are looking to find some time on the circuit through improve acceleration out of lower speed corners, or simply want something which can overtake with ease on the street, the HKS V Cam System provides good power from low RPM reducing the necessity for excessive gear changes. This especially noticeable when going from vacuum to boost to give the feeling of increased displacement.
  • Improved valve timing will allow for more complete combustion leading to improved fuel efficiency and cleaner exhaust emissions.
  • HKS V CAM System is compatible with the stock pistons. (When using with the thinner head gaskets or modified cylinder head, the clearance between valve and piston may be insufficient.)
  • Exhaust cam should be selected dependant on turbo choice. (Recommended: GT-SS-256°, GT2530-264°)

Test vehicle specification

  • Engine: RB26DETT(EX-side 256°)
  • Turbine: GT2530 x 2
  • Intake: Super Power Flow, Airflow-less
  • Exhaust: HKS Metal CAT, Legal Muffler
  • Cooling: Intercooler & Piping Upgraded
  • Fuel: Upgraded Pump (280R/h), I/J 600cc
  • Engine Management: F-CON V Pro (D-jetro), EVC

STEP2

Features
  • Specially designed cam for Step 2 has duration of 264°, valve lift 8.7mm. Acceleration at high rpm is smoother than solid Step 1 camshaft (272IN-272EX). Step 2 is suited to higher power output at all range of engine rpm.
  • Strength is enhanced when used with upgraded Valve Springs at high RPM (recommended limit 8500rpm).
  • Engine output and torque are substantially improved at all engine RPM range compared to solid Step 1 (272IN/EX). Step 2 was designed to show significant power and torque improvement for vehicles tuned to output 600ps or higher compared to old type Step 1 type B (256EX).

Test vehicle specification

  • Engine: HKS 2.8LKIT STEP1 φ87
  • Intake: HKS Racing Suction Reloaded Intake Kit
  • Head Gasket: HKS Head Gasket 1.2mm
  • V Cam Control: VALCON TYPE-RB26
  • Fuel: HKS Fuel Delivery Kit
  • Fuel: HKS 1000cc Injectors
    Turbine: HKS GT2530KAI x 2
  • Oters: HKS Head Bolts, HKS Spark Plug M45

* Boost Pressure - 150kPa
* This result on the graph above is obtained by in-house engine bench test. The result may vary depending on measuring instruments

STEP ZERO

Features
  • V CAM system for higher levels of tuning compared to Step 1 and Step 2.
  • Specially designed cam has duration of 264°, valve lift 10mm. Reviewing cam material, profile and valve timing change, Step Pro is suited to higher power outputs at high rpm.
  • Billet camshaft is used to enhance strength even when used with upgraded Valve Springs at high RPM (recommended limit 8800rpm). Added strength facilitates a hollow cam design has allowing Step Pro to be 560g lighter than Step 1 and Step 2.
  • Valve timing has 50° adjustment from 80°~130°
  • Exhaust cam can be selected to suit vehicle specifications.
  • Step 2 Valve Springs are required.
  • Recess modification of the cylinder head is required.

Test vehicle specification

  • Engine: HKS RB26DETT 2.8L KIT STEP2
  • Exhaust Camshaft: HKS Camshaft STEP2 272°Valve lift-10.2mm
  • Turbine: TO4Z (Boost-1.2kg/cm2)
  • CAT: HKS Metal Catalyzer

* This result on the graph above is obtained by in-house engine bench test. The result may vary depending on measuring instruments

Complete Parts

  STEP1 STEP2 STEP PRO
Special Intake "V CAM" 248° 264° 264°
Variable Valve Timing Unit
(High torque compatible Vane Type,
Ni plated pulley)
Variable amount 30° Variable amount 50° Variable amount 50°
Special Intake Cam Cover Unpainted
(Logo plate)
Unpainted
(Logo plate)
Unpainted
(Logo plate)
V CAM Control Unit VALCON TYPE-RB26 VALCON TYPE-RB26 VALCON TYPE-RB26
OCV (Electromagnetic type)
Oil Filler Cap HKS HKS HKS
Cam Angle Sensor (High accuracy type)
Oil Line (From Engine to Cam Cover)
Other short parts

Required Parts


VALCON TYPE-RB26
  • Exhaust Camshaft
    STEP 1 - Recommended : GT-SS/STEP1 256°  GT2530/STEP1 264°
    STEP 2 - Recommended : STEP1 272°
    STEP Pro - Recommended : STEP2 272° or above
  • Valve Spring
    STEP 2 - HKS Uprated Valve springs (for increasing maximum RPM, Sold separately)
    STEP Pro - HKS Uprated Valve springs required (Sold separately)
  • Piston
    STEP 1 - Stock
    STEP 2, Pro - HKS Piston for valve⇔Piston Clearance
  • Oil Pump
    HKS Oil Pump recommended
  • Head Modification
    STEP Pro required some machining to allow for cam lobe movement

Precautions for Use

【Maximum RPM】
STEP 1 - 8,000rpm (Stock Rev Limiter)
STEP 2 - 8,000rpm (With Stock Valve Springs)
     8,500rpm (With HKS Valve springs, Sold separately)
STEP Pro - 8,800rpm (With HKS Valve springs, Sold separately)
【Oil Temperature, Water Temperature】
If oil viscosity is low, oil pressure may not reach adequate levels resulting in valve timing not reaching desired values. Valve timing will not increase when water temperature is under 60°C
【Recommended Oil】
SUPER OIL (RB), Racing Pro Oil 10W-50
【Timing Belt】
Check every 10,000km for wear and tension. Adjust or replace if necessary.

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