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Old 08 Aug 2007, 05:23 pm
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Default 2007 Honda Fit Powertrain

Torrance, Calif. - Mar 31 —

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Overview

The 2007 Honda Fit powertrain is designed to deliver fun-to-drive performance
with good fuel economy and low emissions. All Fit models are equipped with a
1.5-liter, SOHC, 16-valve 4-cylinder VTEC gasoline engine that generates 109
horsepower and is available with either a 5-speed manual transmission (standard)
or a 5-speed automatic transmission (available). The efficient and compact engine
uses Honda's Variable Valve Timing and Lift Electronic Control (VTEC)
system to deliver top-of-class performance for the sub-compact segment. And,
like all Honda engines, it offers excellent fuel economy and low emissions with
an estimated EPA city/highway fuel economy rating on manual transmission models
of 33/38 miles per gallon and a Low Emissions Vehicle-2 (LEV-2) rating in California
(Tier 2 Bin 5 Federal emissions rating).


Powertrain Highlights


  • 1.5-liter 16-Valve SOHC 4-cylinder VTEC engine

  • 109 hp @ 5800 rpm and 105 lb.-ft @ 4800 rpm

  • Honda-estimated EPA fuel economy of 33 mpg city/38 mpg highway

  • CARB rated LEV-2 emissions, Federal Tier-2 Bin-5

  • Narrow angle intake port design

  • Low-friction engine design

  • Drive-by-Wire throttle control

  • Standard 5-speed manual transmission

  • Available 5-speed automatic transmission (segment exclusive)

  • Steering wheel-mounted paddle shifters on Fit Sport with automatic transmission


Most significantly, Fit features Honda's exclusive VTEC valvetrain technology,
a composite intake manifold, and low-friction construction for the rocker arms
and engine block. The end result is an engine with good low end torque, high-revving
power and a high level of fuel efficiency. Further refinements include the use
of electronic drive-by-wire throttle control, which allows for quick and precise
delivery of fuel to the engine.


The Fit's engine is mated to either a 5-speed manual transmission (standard)
or a 5-speed automatic transmission (available). The 5-speed automatic transmission
is a first for the Fit worldwide, and it is a first for the segment. Fit's
5-speed automatic transmission also offers a unique steering-wheel-mounted paddle
shifter system on the Fit Sport that enhances the driving experience. In manual
mode, the transmission will hold the selected gear until another one is selected.


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1.5-Liter 16-valve SOHC VTEC 4-Cylinder Engine

The goal of Fit's 1.5-liter VTEC engine is to optimize the balance between
high fuel economy and fun-to-drive performance. Using new SAE net horsepower
standards (revised 8/04), the Fit's 4-cylinder engine is rated at 109-horsepower.


The engine displaces 1,497 cc and has a 10.4:1 compression ratio with a bore
and stroke measuring 73mm x 89.4 mm. The compact VTEC cylinder head utilizes
a narrow, 30-degree design between the intake and exhaust valves, contributing
to the engine's overall compact size. The lightweight composite intake manifold
is a long runner design that contributes to good low and mid-range torque output.
Friction reducing technologies include roller bearing tipped rocker arms, a
low friction timing chain tensioner, molybdenum coated piston skirts and an
offset crankshaft/connecting rod design. Low emissions are a key trait of every
Honda engine, and the Fit employs an oblique flow catalytic converter (increases
contact area of exhaust gas inside catalyst), stainless steel exhaust pipes
(fast warm up, good heat dissipation and low weight) and a conventional exhaust
gas recirculation system (re-routes part of the exhaust gas back into the intake
air fuel mixture).




























































Subcompact Power
.
2007 Fit
2006 Kia Rio **
2006 Scion xA**
2006 Chevrolet Aveo**
2007 Toyota Yaris**
Engine displacement (liters)
1.5
1.6
1.5
1.5
1.5
Horsepower @ RPM (SAE net)
109 hp @ 5800
110 hp @ 6000
103 hp @ 6000
103 hp @ 6000
106 hp @ 6000
Torque @ RPM
105 lb.-ft @ 4800
107 lb.-ft @ 4500
101 lb.-ft. @ 4200
107 lb.-ft. @ 3600
103 lb.-ft @ 4200
Fuel Economy (city/hwy)
33/38 (MT)

31/38 (AT)

31/37 (AT-Sport)
26/34 MT

25/32 AT
32/37 MT

31/38 AT
26/35 MT

24/34 AT
34/40 MT

34/39 AT
Transmissions
5MT or 5AT
5MT or 4AT
5MT or 4AT
5MT or 4AT
5MT or 4AT
*Based on 2007 EPA mileage estimates. Use for comparison purposes
only. Acutal mileage may very.
** Specifications based on manufacturers' published information.

VTEC

Part of the balance between efficiency and power is made possible by Honda's
VTEC variable valve timing system. In the Fit's 16-valve SOHC engine,
the VTEC system employs a two rocker arm design (per cylinder on the intake
valves) with friction-reducing roller followers for each pair of intake valves,
along with intake cam lobes configured to optimize both low- and high-speed
operation. Depending on engine load and rpm, an electronic controller determines
which cam profile will be used and exactly how the intake valves will operate
(usually around 3,400 rpm).


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At low revs, where low lift and shorter duration provide optimal operation,
the timing of the two intake valves is staggered and the lift asymmetrically
skewed in favor of the primary valve. This helps to create a swirl effect within
the combustion chamber that increases the efficiency of the burn process. At
higher rpm, a hydraulically actuated spool valve causes a locking pin to engage
the secondary rocker arm with the primary one, transitioning the secondary valve
into a long-duration mode that increases the volume of air/fuel mixture moving
into the combustion chamber. The additional air/fuel mixture helps increase
power at high rpms.


Electronic Drive-by-Wire Throttle Control

Typically not found on subcompact entry vehicles, electronic Drive-by-Wire throttle
control allows Fit to optimize the throttle aperture when the accelerator pedal
is applied. Unlike mechanical throttle control, which relies on a cable linking
the accelerator pedal to the throttle, drive-by-wire measures the engine's
fuel needs electronically, and Fit's computer ECU instantly determines
the optimal throttle opening for the driving situation. The throttle body diameter
on the Fit is 50mm.


Transmissions Overview

Two transmissions are offered with the Fit, a standard 5-speed manual and a
new, lightweight 5-speed automatic transmission with available steering wheel-mounted
paddle shifters (on Fit Sport). Both are designed to optimize the power transfer
from Fit's high-revving engine and allow for quick, smooth shifts in all
gears.











































Gear Ratios
5-Speed MT
5-Speed AT
1st
3.462
2.996
2nd
1.870
1.679
3rd
1.321
1.067
4th
0.970
0.756
5th
0.757
0.550
Reverse
3.231
1.957
Final Drive Ratio
4.29
4.56

Standard 5-Speed Manual Transmission

Fit's standard 5-speed manual transmission benefits from short shift strokes,
while carbon single-cone synchronizers in first and third gear and double cone
synchronizers in second gear minimize shift load and increase durability. In
first and third gear, the carbon synchronizers reduce the shift load and enhance
durability.


Similarly, the double cone synchros used in second gear also helps reduce shift
load and contribute to smoother gear shifts and a precise feel. The shifter,
complemented by a large and sporty shift knob, shifts through its gear ratio
range to provide quick acceleration in lower gears and high fuel economy in
higher gears.


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Available 5-Speed Automatic Transmission

Fit is one of the only vehicles in its class to offer a 5-speed automatic transmission.
The transmission is designed to work in concert with the drive-by-wire throttle
control to provide quick and smooth shifts. The compact transmission employs
a Direct Control System that manages the oil flow in Fit's lockup clutch
torque converter to minimize shift shock. The lockup clutch control improves
Fit's fuel economy by operating in all gears, compared to conventional
transmissions that operate torque converter lockup only in a few gears. This
is most noticeable during braking from higher speeds when the Direct Control
System activates the lockup clutch as the transmission downshifts, maximizing
the effect of engine braking and the cut of fuel to the engine during this time.


The lightweight transmission, use of the Direct Control System and the active
lockup torque converter help the Fit's automatic transmission models achieve
similar fuel economy as its generally more-efficient manual transmission counterparts.


Racing-inspired steering-wheel mounted paddle shifter

Fit Sport models with the automatic transmission are equipped with a paddle
shifter system mounted on the steering wheel, allowing drivers to quickly and
simply control the shifting of the 5-speed automatic transmission. The steering
wheel-mounted paddle shifters offer two standard shifting profiles, "Drive"
or "Sport," and allow drivers to manually shift gears up or down.
The Fit's Smart Paddle incorporates two buttons on the steering wheel.
The button on the left controls downshifts and the button on the right controls
upshifts. When the Fit's main shifter is in D, or normal drive mode, the
paddle shifter can be used to downshift for increased power on hill climbs or
engine braking on descents with the transmission automatically shifting up when
conditions return to normal. An indicator within the tachometer of Fit's
instrument cluster informs the driver what gear the vehicle is in and blinks
when a downshift is unavailable.


In Sport mode (S), however, the driver has more control. The transmission will
hold whichever gear is chosen by the driver via the paddle shifter. As opposed
to normal driving situations where Fit's transmission would automatically
upshift when needed, in Sport mode, the transmission holds the selected gear
until it is manually shifted.


Fit Powertrain Trivia


Globally, the Honda Fit (also known in European markets as the Jazz) is available
in more than 70 countries with four unique engine configurations and three transmissions.
The engine is commonly been called the "L" series among enthusiasts,
and those engines include:



  • 1.2-liter, 8-valve, SOHC, i-DSI

  • 1.3-liter, 8-valve, SOHC, i-DSI

  • 1.5-liter, 8-valve, SOHC, i-DSI

  • 1.5-liter, 16-valve, SOHC, VTEC


Not used on the U.S. market Fit, Honda's "intelligent" Dual
and Sequential Ignition (i-DSI) system uses two spark plugs per cylinder and
can fire the spark plugs separately or at the same time to influence combustion
characteristics inside the engine (i-DSI is used on the U.S. Civic Hybrid, however).
Three transmissions are available in global markets, and those are a Continuously
Variable Transmission (CVT), a 5-speed manual transmission and 5-speed automatic
transmission. Honda engineers examined localized market preferences when developing
the Fit for the U.S., and chose the most powerful engine in the global lineup
- the 1.5-liter 16-valve SOHC VTEC (L15A) - and the most appropriate
transmissions - the 5-speed manual and the 5-speed automatic.

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