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Old 12 Sep 2007, 04:40 pm
Join Date: Aug 2007
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Default 2008 Acura MDX - Safety

Torrance, Calif. - Sep 12 —


The 2008 Acura MDX continues the MDX's commitment of advancing SUV passive
safety. Standard features include dual-stage, dual-threshold front airbags,
front active head restraints, side curtain airbags and driver dual-stage knee
bolsters. In addition, the MDX features the Advanced Compatibility Engineering™
(ACE™) body structure, designed to disperse frontal collision forces and
improve car-to-car collision safety.

Acura terms this compendium of safety features as "Flagship 360 degree
safety" as quite literally passengers are completely surrounded with safety
features. The 2008 MDX meets the highest crash-test standards from the National
Highway Traffic Safety Administration (NHTSA) and Insurance Institute for Highway
Safety (IIHS).

Specific Safety Targets

  • Newly upgraded FMVSS208 frontal and FMVSS301 rear collision standards
    implemented by the federal government

  • 5-Star rating in National Highway Traffic Safety Administration
    (NHTSA) frontal and side impact crash tests

  • GOOD ratings in Insurance Institute for Highway Safety (IIHS) Frontal
    Offset, Side and head restraint tests

  • Rated as an IIHS TOP SAFETY PICK

  • Enhanced crash compatibility with smaller vehicles in a car-to-car
    collision compared to previous generation vehicles

  • Advanced protection for pedestrians in the event of a collision


The 2008 MDX passed all National Highway Traffic Safety Administration (NHTSA)
and Insurance Institute for Highway Safety (IIHS) tests at the highest levels.
NHTSA tests include Frontal, Side, and Rollover, while IIHS tests include Frontal
Offset, Side Impact (also known as SICE), and Rear Crash Protection indexes.

NHTSA test results include:

  • NCAP Driver - 5 STARS

  • NCAP Passenger - 5 STARS

  • SINCAP Front seat - 5 STARS

  • SINCAP Rear seat - 5 STARS

  • Rollover Rating - 4 STARS

IIHS test results include:

  • IIHS Frontal offset - GOOD

  • SICE side impact - GOOD

  • IIHS Rear crash safety - GOOD



The newly upgraded FMVSS301 standard is much more severe than the previous
standard. In the new test, a 1,360 kg (2,992 lbs.) deformable barrier strikes
80-percent of the vehicle's width at 50 mph. In contrast, the previous
FMVSS301 used a 1,814 kg (3,991 lbs.) flat rigid barrier that struck the full
width of the vehicle at 30 mph. The new standard requires more body energy absorption
than before - and the 2008 Acura MDX provides it, ensuring a high level
of protection for its occupants.


As the popularity soared for full-size pickups and SUVs in the last decade,
so did the risk of these large vehicles colliding head-on with smaller vehicles.
The disparity in vehicle mass - as well as the higher bumper height of
the larger vehicles - put the smaller vehicles at a disadvantage. For
the 2008 Acura MDX, however, engineers integrated a more stringent internal
vehicle-to-vehicle collision standard to help correct this discrepancy. This
front-to-front collision standard goes above and beyond what is required by


Like the Acura RL and RDX, the 2008 MDX features Advanced Compatibility Engineering™
(ACE™) unit body design. ACE™ distributes frontal crash forces much
more widely to reduce cabin intrusion and deformation, and absorb frontal crash
energy forward of the passenger cabin. ACE™ also helps maintain the structural
integrity of the passenger cabin during a severe car-to-car offset frontal crash.
It does this by distributing forces through multiple load paths during the crash,
thus allowing more uniform energy absorption and less cabin intrusion.

If the MDX should collide head-on with a smaller and lighter vehicle, Advanced
Compatibility Engineering™ (ACE™) helps provide good engagement
of the small vehicle's frame. This helps reduce the risk of intrusion
while simultaneously helping to disperse the crash energy across a wider area
at the front of the vehicle. The upper portions of the ACE™ front structure
also improve cabin protection.


The 2008 MDX achieves a "GOOD" rating in the rigorous (but also
voluntary) IIHS Side Impact Crashworthiness Evaluation (SICE) evaluation, which
measures how well a vehicle withstands intrusion from a large SUV in a side
collision. The MDX's high-strength steel safety cage and the use of high-strength
side door beams help make it resistant to intrusion.


The 2008 MDX has front active head restraints that help minimize the potential
for the driver or front passenger to suffer a neck injury during a rear-end
collision. During this type of collision, the occupant's body applies
pressure to the seatback. This pressure activates a lumbar plate that pushes
the head restraint upward and forward to help equalize forces acting on the
head, neck and spine during a collision. This ability to manage rear collision
forces directly contributes to a reduction in whiplash injuries.


As part of Acura's "Safety Through Innovation" initiative,
the 2008 Acura MDX makes pedestrian safety a high priority. It adopts several
pedestrian-safety measures that U.S. law does not require. The MDX hood is designed
to help protect pedestrians by absorbing collision energy. In addition, the
hood hinges are designed to bend in the event they are contacted by a pedestrian.
The wiper pivots also feature a breakaway design to help reduce injury in the
event of contact, and the front fender brackets are also designed to bend if
a collision with a pedestrian should occur.


Both of the MDX front seat belts have pretensioners and load limiters to help
protect the driver and front passenger in a collision. These components automatically
work together in a 1-2 sequence. Research has shown that seat belts that are
snugly secured around the occupants provide better protection, so in the first
few milliseconds of a collision the pretensioners - powered by a pyrotechnic
device - automatically tighten the front seat belts. Then if the deceleration
forces rise above a predetermined threshold, the load limiter releases a small
length of seatbelt webbing to reduce the pressure on the occupant in a controlled
manner. This helps reduce the injuries that seatbelts can cause in a severe
high-speed collision. In addition, the driver's seatbelt has a dual-stage
load limiter. This provides a higher initial load, then steps down to a lower
load after a certain amount of belt spools out. It is specially designed to
prevent too much forward driver movement, given the close proximity of the steering


Dual-stage airbags are provided for the 2008 MDX driver and front passenger.
These airbags are designed to maximize protection for the head and chest during
a moderate to severe front collision. Each airbag inflator has two stages that
can be deployed at different times instead of a traditional single inflation
stage. Combining dual-stage and dual-threshold technology with technology that
detects if the occupants are belted or unbelted, the airbags are deployed in
a sequence based on crash severity.

Dual-Stage, Dual-Threshold Airbag Parameters

  • Airbag deployment characteristics are finely controlled depending
    on the severity of a collision

  • The dual-stage, dual-threshold strategy applies to front airbags
    only and does not affect operation of side airbags or side curtain airbags

The MDX airbag system uses a seat weight sensor to assess the weight of the
front passenger. The front passenger airbag is shut off if the weight sensor
indicates that a small child or a baby carrier is occupying the front seat.
A seamless instrument panel cover fully conceals the passenger airbag. The driver's
seat has a seat position sensor. If the seat is in a more forward position,
where the occupant will be close to the airbag, the airbag is fired with a longer
delay to reduce the chance of any injury caused by the airbag itself. The driver-side
airbag is located in a small steering wheel mounted housing.


To help prevent injuries to the driver or front passenger's legs in a
frontal collision, the 2008 MDX has energy absorbing knee bolsters. They are
designed to dissipate collision forces if the driver or front passenger's
legs should contact the lower instrument panel during a frontal collision. In
addition, the driver's side has dual-stage knee bolsters that are designed
to provide additional protection to small-stature occupants who have to sit
close to the steering wheel.


Side airbags mounted in the outboard area of each MDX front seatback are designed
to provide upper torso protection in the event of a severe side impact. In addition,
the front passenger's seat is equipped with Occupant Position Detection System
(OPDS), an innovative system designed to deactivate the side airbag if a small
child (or small-stature adult) leans into the side airbag deployment path. When
the passenger returns to an upright seating position, the side airbag reactivates
so it can deploy to help protect the occupant in a side impact. This unique
system utilizes sensors in the passenger seatback to determine the height and
position of the occupant, and determine if it is safe to deploy the side airbag.


In a sufficient side impact or rollover, the MDX's side curtain airbags
deploy from roof-mounted modules, providing head protection for all three rows
of seating. Side curtain airbags effectively cover the side window area from
the front seats all the way to the third-row seat. Tests show that the g- forces
acting upon an occupant's head are far lower with side curtain airbags.

In the 2008 MDX the side curtain airbag system includes three satellite sensors
and a main unit, and detects a crash within 5-7 milliseconds. It also includes
a rollover sensor, even though the new MDX is projected to offer better rollover
stability than the previous MDX, and perform solidly with a 4 Star rating in
the NHTSA rollover category. The 2008 MDX is also projected to be superior to
the Porsche Cayenne in rollover stability.


The 2008 MDX includes a LATCH (Lower Anchors and Tethers for CHildren) child-seat
mounting system for the second-row seating positions. LATCH features built-in
lower anchors and ready-to-use tether attachment points that allow compatible
child safety seats to be installed without using the vehicle's seat belt system.
Additionally, the LATCH system simplifies child-seat installation when an owner
installs a LATCH-compatible child seat.


The MDX's 21-gallon fuel tank, up from 20.4 gallons in the previous
MDX, is positioned in front of the rear body-deformation zone to minimize the
risk of damage in a collision. Locating the fuel tank in this protected area
optimizes vehicle balance by moving the weight of the fuel tank and fuel farther
forward. Thus, handling characteristics are minimally affected whether the fuel
tank is full or near empty.

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