2021 ACURA NSX cooling

15
Quick Reference Guide
Auto Engine Stop/Start
Your vehicle’s gasoline engine will automatically stop and start during vehicle operation as needed to meet driving and battery conditions.
These are some examples that could cause the gasoline engine to automatically start.
In the following cases, however, Auto Engine Stop may not activate.
●When the Integrated Dynamics System is in SPORT+ mode or TRACK mode.●The vehicle momentarily needs additional power for aggressive acceleration, or driving uphill or at high speed.●The climate control system is in heavy use.●The High Voltage battery temperature is high or low.●The High Voltage battery state of charge is low.●The engine coolant temperature is low.●When the door is opened after releasing seatbelt.●When the shift position is in M (Manual) mode.
About Your Vehicle’s Limited Operating Temperature
If the outside temperature is about -4°F (-20°C), some operation might be limited.
The limited operation is listed below:
2 High Voltage Battery (P94)
2 Dual Clutch Transmission (P329)
2 Shifting (P330)
Sounds Unique to th e SPORT HYBRID SH-AWD ® System
When you first start driving this vehicle, you likely will hear some unfamiliar sounds, particular ly when you first turn on the power system,
while driving, and just after parking. Some of these sounds are unique to this ve hicle‘s powertrain, fuel, and climate control systems; others
are similar to sounds generated by conventional automobiles that typically are masked by louder noises absent from a vehicle of this design.
These sounds are not a cause for concern, and you will soon recognize them as normal and thus be able to detect any new or unus ual noise
should one develop.
About a system to cool the High Voltage battery using the climate control system.●The system will not be activated when the defroster is ON.●When the outside temperature is in extreme hot or cold condit ion, the system may not provide sufficient cooling performance to the
High Voltage battery due to the protection of the electric A/C compressor.
●When the system is active, the climate control system may not work sufficiently.
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314
Driving
Before Driving
Driving Preparation
Check the following items before you start driving.
• Make sure there are no obstructions on th e windows, door mirrors, exterior
lights, or other parts of the vehicle.
u Remove any frost, snow, or ice.
u Remove any snow on the roof, as this can slip down and obstruct your field of
vision while driving. If frozen solid , remove ice once it has softened.
u When removing ice from around the wheel s, be sure not to damage the wheel
or wheel components.
• Make sure the hood is securely closed.
u If the hood opens while driving, your front view will be blocked.
• Make sure the tires are in good condition.
u Check air pressures, and check for damage and excessive wear.
2Checking and Maintaining Tires P. 411
•Make sure there are no people or ob jects behind or around the vehicle.
u There are blind spots from the inside.
• Check the front bumper duct s and side intercooler ducts for mud, leaves, and
road debris that could build up and prevent proper cooling performance.
■Exterior Checks1 Exterior Checks
NOTICE
When doors are frozen s hut, use warm water around
the door edges to melt any ice. Do not try to force
them open, as this can damage the rubber trim
around the doors. When done, wipe dry to avoid
further freezing.
Do not pour warm water into the key cylinder.
You will be unable to insert the key if the water
freezes in the hole.
Heat from the engine and exhaust can ignite
flammable materials left und er the hatch, causing a
fire. If you’ve parked y our vehicle for an extended
period, inspect and remove any debris that may have
collected, such as dried grass and leaves that have
fallen or have been carried in for use as a nest by a
small animal.
Also check under the hatch for leftover flammable
materials after you or so meone else has performed
maintenance on your vehicle.
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Continued321
uuBefore Driving uHigh-Performance Driving
Driving
• Burnish the brake pads shortly before high-performance driving so that they have
the performance characteristics necessary to repeatedly and quickly slow the NSX
when it is being operated at signific antly high speeds. (While the NSX’s brake
pads are properly burnished for the demands expected in ordinary day-to-day
driving, high-performance driving puts unique demands on the brake system
which require further burnishing.)
• Inspect ALL cooling openings to confirm th ey are open and free of debris such as
leaves, etc. Cooling openings include engi ne undercover ducts, heat resistance
ducts, brake ducts, radi ators, and intercoolers
• Remove Tire Repair Kit from the trunk, along with any other cargo area contents
• Check tire wear and tire pressure, and m ake certain wheel lug bolts are properly
torqued, as driving at high speed puts additional strain on tires and wheels. Never
use slick tires, and do not use Summer On ly tires and Ultra High Performance tires
if temperatures will be lower than 45°F (7°C)
• If you anticipate sustained driving at speeds greater than 168 mph/270 km/h,
adjust the cold tire pressure as shown on the driver door jamb warning label. This
will help avoid heat build-up and sudden tire failure1 High-Performance Driving
3WARNING
Use of slick tires/racing slicks may subject
the chassis and body components to higher
dynamic loads than they were designed for.
Higher than intended dynamic loads could
result in component fail ure, loss of control,
and serious injury or death to you or others.
Do not install slick tires on the NSX.
Canadian models
U.S. models
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322
uuBefore Driving uHigh-Performance Driving
Driving
• Inspect all exhaust mounts for cracks or signs of wear
• Inspect tailpipe active exhaus t valves to ensure they are functioning correctly. You
can do this by cycling the Integrated Dynamics System mode switch between
SPORT and TRACK modes, while the engine is idling
WHILE DRIVING
• You may see a brake warning message in the Driver Information Interface (and
warning message chime) and/or expe rience increased brake pedal stroke.
If either occurs, immediately slow do wn and allow for increased stopping
distances. The message will disappear once the brakes have cooled and the
system has returned to normal operating condition
• After high-performance driving, it is critic al to allow your vehicle to properly cool
down. Do not immediately stop your vehicle. Instead, continue driving at reduced
speeds, allowing for increased braking di stances until your vehicle returns to
normal operating temperatures. Once you stop and safely park the NSX, open the
hatch to aid cooling. If the engine oi l temperature reaches the mark during
high-performance driving, have your NSX inspected by an authorized Acura NSX
dealer
H
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328
uuWhen Driving uPrecautions While Driving
Driving
Precautions While Driving
Avoid driving in deep water and on flooded roads. This can damage the power
system or driveline, or caus e electrical component failure.
The vehicle is equipped with ultra high pe rformance summer tires that, due to their
decreased tread depth, are at greater risk of hydroplaning on wet roads compared
to regular tires. Exercise caut ion when driving on wet surfaces.
The vehicle is equipped with ultra high performance summer tires. These tires are
designed for optimum performance and handling in warm climates, and are not
suitable for below freezing, snowy or ic y weather conditions. If you drive under
these circumstances, use of winter tire s is recommended and may be mandatory,
depending on your region, province or territory.
2 Winter Tires P. 419
2 Cold Weather Driving P. 420
Due to limitations of the Lithium-ion Hi gh Voltage battery, the minimum starting
temperature for the vehicle is -4°F (-20°C).
Inability to start the vehicle and/or decrease d performance is expected if the vehicle
is operated at temperatures below -4°F (-20°C).
■In Rain
■In Snow and Ice
1 Precautions While Driving
NOTICE
Do not select a shift button while pressing the
accelerator pedal.
NOTICE
The following can damage the under spoiler, under
covers, front bumper, rear diffuser, brake cooling
components, and side sill:
•Parking the vehicle by a parking block•Parallel pa rking along the road shoulder•Driving toward the bottom of a hill•Driving up or down to a different surface level
(such as a road shoulder)
•Driving on a rutted or bumpy road•Driving on a road with potholes•Driving over speed bump
NOTICE
If you repeatedly turn the steering wheel at an
extremely low speed, or hold the steering wheel in
the full left or right position for a while, the electric
power steering (EPS) system heats up. The system
goes into a protective mode, and limits its
performance. The steering wheel becomes harder
and harder to operate. Once the system cools down,
the EPS system is restored.
Repeated operation under these conditions can
eventually damage the system.
If the power mode is set to ACCESSORY while
driving, the power system will shut down and all
steering and brake power a ssist functions will stop,
making it difficult to control the vehicle.
Driving in snow or icy c onditions may accumulate ice
on the brake disk surface, reducing br aking power.
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329
uuWhen Driving uDual Clutch Transmission
Driving
If there is a strong impact with something under the vehicle, stop in a safe location.
Check the underside of the vehicle for damage or any fluid leaks.
If any of these components are damaged or loose, the stability, handling, and
powertrain cooling performance of the vehicle may be adversely affected.
Dual Clutch Transmission
As with a conventional gasoline-powered ve hicle with an automatic transmission,
this vehicle will creep.
Keep the brake pedal firmly depressed when stopped.
The accelerator pedal features a kick down switch. Quickly depressing the
accelerator pedal while driving may cause th e transmission to drop to a lower gear,
subsequently increasing vehicle speed. De press the accelerator pedal carefully,
especially when driving uphill, on slippery roads, and curves.
■Other Precautions
■Creeping
■Kickdown
1Precautions While Driving
Do not select
(N while driving as you will lose engine
braking (and accelera tion) performance.
Avoid hard braking for the first 200 miles (300 km).
You should also follow this recommendation when
the brake pads are replaced.
Models with iron brake discs
1 Dual Clutch Transmission
The DCT will not operate when it is extremely cold. If
the vehicle has been parked in extremely cold
conditions, after you start th e engine, wait until it
gets warm. Keep your vehicle parked until the
READY indicator comes on.
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342
uuWhen Driving uIntegrated Dynamics System
Driving
Category QUIETSPORTSPORT+ TRACK
Powertrain
Control
Powertrain
Start-upEV operation is
prioritized, starts
quietly.Powerful start-up sound.
Powertrain
SoundMinimum sound for
quiet driving.Balanced sound for city
and highway use.Emotional sound for
increased feedback.Maximum sound for
driving on race track
with helmet on.
Hybrid
Battery
ManagementEfficiency and smooth
quiet operation are
prioritized.Balanced management
for response and
efficiency.Maximum electric assist
for acceleration.Battery charge is
managed to give
consistent lap time
during track use.
Hybrid
Battery A/C
CoolingBattery A/C cooling is
not used in this mode.Battery A/C cooling is active however cabin
cooling is prioritized.Battery A/C cooling is
active and may
compromise cabin
cooling.
EV OperationAvailableAvailableNot availableNot available
Driving Force
CharacterEase of force
modulation for
comfortable operation.Balanced tuning of
drive force request for
all driving scenarios.Maximum response.Linear response for
ease of cornering line
control.
DCT Shift
Map/
ResponseComfortable/low
engine speed priority.Balanced tuning for all
driving scenarios.Quick downshifts on
request, lower gears
are held for maximum
response.Gears are held to
maximize performance
on track. Shifts are very
fast.
SH-AWD®Quiet and comfortable
operation.Balanced setting for
secure every day use in
any condition.Traction and response
are prioritized for
performance on
winding roads.Settings are optimized
for dry surface, high
cornering load with
neutral handling
attitude.
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uuWhen Driving uIntegrated Dynamics System
344
Driving
SPORT+ mode optimizes dynamic response
from all powertrain an d chassis systems -
perfect for your favorite winding road.
• EV operation is elimin ated while operating
in SPORT+ .
TRACK mode gives maximum, consistent
performance from dyna mic systems during
track day lapping sessions. Hybrid battery
charge is maintained for consistent
performance.
• VSA ® OFF indicator is illuminated in TRACK
mode indicating reduced stability control.
This allows more body side slip and wheel
spin before VSA ® begins to operate.
• Integrated Dynamics switch must be turned
and held to the right for several seconds to
engage TRACK mode.
■SPORT+ Mode
■TRACK Mode1TRACK Mode
Before choosing the TRACK mode, carefully read the
information about high performance driving.
2 High-Performance Driving P. 319
During TRACK mode, the climate control system may
weaken its function to pr ioritize cooling the High
Voltage battery.
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