differences 2.7 Pre-Facelift & Facelift Toyota Hilux models
attached pictures shows the two different head and intake runner
configurations for the pre-facelift (8 port) and the facelift (4
port) heads on the 2.7 Hiluxes, pre-facelift being from about 99-2002
and the facelift 2003-2005. From my research it looks like the 8
port head provides more torque low down and responds better to a
gasflow and mild cams as well as having better fuel consumption.
I am currently contemplating fitting an 8 port head to my 2004 model.
Some of the other differences are the airflow meters, the pre-facelift
models uses a MAF with the facelift models using a MAP sensor, valve
timing and exhaust manifolds
Port Inlet Manifold of the Facelift Hilux (2003-2005)
Port Inlet Manifold of the Facelift Hilux (1998-2002)
changes were done to comply with the California emissions control
standards as can be seen from the extract below from the attached
file, click here
FEATURES - 2RZ-FE AND 3RZ-FE ENGINE
- The generator
has been changed from 70 A to 80 A for both engines.
- On the California
specification model, both engines comply with the LEV (Low Emission
- The EGR
(Exhaust Gas Recirculation) system has been discontinued for the
General - To comply with the LEV requirements, the following changes
have been made:
- The shape
of the intake port of the cylinder head has been changed.
- Valve timing
has been changed.
- Along with
the change in the shape of the intake port of the cylinder head,
the intake manifold has been changed.
- A compact,
1-coil type IAC valve has been adopted.
- An exhaust
manifold made of stainless steel has been adopted.
- WU-TWC (Warm
Up Three-Way Catalytic Converter) is used.
fine-atomization, 12-hole type fuel injectors have been adopted.
- The DIS
(Direct Ignition System) that provides one ignition coil for every
cylinder has been adopted.
ratio sensor is used.
Head - A Siamese port configuration has been adopted for
the intake port of the cylinder head.
- 23 Sept 2008
I picked up another difference between the 8 port/4 port pre-facelift/Faclift
hiluxes while going through the part no's. I thought it was only
the cam timing that was different but it looks like there are two
different cams being used in the two models. The exhaust cam on
all the 3RZ-FE enigines are the same Toyota part no 13502-75010,
the cam sprocket is also the same Toyota part no 13523-75010. On
the intake cams there are two part no's 13501-75030 and 13501-75040,
the first one seems to have been used on the 8 port/pre-facelift
models and the latter on the 4-port/Facelift models. I will be visiting
my local Toyota dealer to try and confirm this and if this is the
case I will be getting the 8 port intake cam for mine to try out.
This could be one of the major reasons for the difference in fuel
here to discuss this topic