October, 2001
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2.5 DTI 24V engine also available with new 5-speed automatic transmission
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Common-rail direct injection and fuel cooler
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110 kW (150 hp) output, 300 Newton-meters torque, low fuel consumption
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Hydro engine mounts with controllable settings enhance refinement
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ESP standard on all Omega six-cylinder models from November on
Rüsselsheim. A new turbo-diesel engine with common-rail direct injection is the most important new feature on the Opel Omega at the start of the 2002 model year. The
2.5-liter inline six-cylinder engine with 24 valves has a power output of 110 kW (150 hp) and generates a maximum 300 Newton-meters of torque between 1750 and 3000 rpm. This powerful, smooth-running diesel is available with either a manual five-speed gearbox or a new automatic transmission (from November on) that also has five ratios.
Like all Omega six-cylinder models for the 2002 model year, the 2.5 DTI has a new honeycomb radiator grill with a larger Opel emblem and – from November on – ESP as standard. The infotainment equipment on Opel’s top model is now even more advanced: the navigation systems are more precise and – where TMC transmitters are available – include dynamic route guidance. Another special feature is the DVD system which will be available for the station-wagon models from early 2002 on. Rear passengers can watch films in movie quality during the journey, play music CDs or connect a games console or camcorder.
Six Cylinders: 2.5 DTI 24 V Common Rail Turbo-diesel with Direct Injection
The 2.5-liter direct injection engine has over 15 percent more power and 20 percent more torque compared with the previous version with the same displacement.
Nevertheless, the fuel consumption of the Omega 2.5 DTI has been reduced by

- 2 around three percent with the five-speed manual gearbox and almost five percent in combination with the new five-speed automatic transmission. The six-cylinder engine, which complies with Euro 3, will be supplied like its predecessor by BMW Motoren
GmbH in Steyr, Austria. The five-speed automatic transmission – as also used by
BMW – comes from GM Powertrain’s transmission plant in Strasbourg, France.
Fuel supply to the 110 kW/150 hp DI diesel engine is by means of a common-rail injection system. This permits injection pressures as high as 1350 bar and close control of the injection process. This high pressure and the injec tor’s central position create a symmetrical spray pattern with very fine distribution of the fuel. A precise preinjection phase makes for smooth combustion. In conjunction with the compression ratio of 17.5:1 (relatively low for a diesel), the engine is extremely refined.
Comprehensive sound-attenuation adds to the high level of acoustic comfort.
High-Level Refinement: Hydro Mounts Eliminate Vibration when Idling
The design of the six-cylinder inline engine also plays a major role in the impressively smooth running. The crankcase is a gray iron casting and has special skirts that end
60 millimeters below the cra nkshaft’s centerline and make a stable connection with the oil sump. A torsional vibration damper on the crankshaft and – for manual-gearbox models – a dual-mass flywheel are further features for added refinement on this powerful diesel engine. A hydro-mou nt with a variable setting for the Omega 2.5 DTI’s engine effectively eliminates residual vibration when idling and ensures the highest level of comfort. This sophisticated system has a soft setting when idling, but becomes firmer when engine speed exceeds 950 rpm.
In the alloy cylinder head, four valves per combustion chamber are operated from two overhead camshafts. This is beneficial for exhaust emission quality and the engine’s specific power output. Whereas in spark-ignition engines the gain in volumetric efficiency – in other words the greater air-flow rate – is a major plus for four valves per cylinder, the central position of the injector is especially important in diesel engines for an efficient combustion process. Another benefit of the two intake ports leading to

- 3 each cylinder: one channel fills the combustion chamber, the other imparts swirl to the incoming air.
Optimized: Engine Specially Developed for the Omega
Although the engine is practically identical in its basic dimensions with the BMW version, all the peripherals have been modified. This also applies to the engine management unit. An electro-pneumatic converter controls the angle of the turbocharger’s guide vanes. Their variable geometry speeds up the throttle response at low speeds and, aided by the intercooler, boosts efficiency in the upper speed range even more.
In this new form the six-cylinder engine develops 110 kW/150 hp at 4000 rpm. The maximum torque of 300 Newton-meters is available at an engine speed as low as
1750 rpm and remains at this high level up to 3,000 rpm. This torque characteristic means pulling power from a standstill and high reserves of power. The Omega 2.5 DTI accelerates in fifth gear from 80 to 120 km/h in only 12.5 seconds – a full three seconds faster than its far from sluggish predecessor. For the sprint from zero to 100 km/h, the manual gearbox Omega 2.5 DTI needs only 10.5 seconds, top speed is 208 km/h and the combined MVEG fuel consumption is only 7.6 liters per 100 kilometers.
The Omega diesel eng ine’s air cleaner with integrated hot-film-air-mass sensor has been developed by Opel and is – unlike on a BMW – mounted on the body. Other
Opel-specific components are the oil sump and the fuel cooler. This takes the form of a fourfold, impact-protected cooling loop some 50centimeters long on the vehicle’s underbody in the fuel sy stem’s return flow line. The location and design makes use of optimal exposure to the slipstream and a simultaneous re-direction of exhaust air from the hot engine compartment in order to achieve an increased cooling effect. The cooler prevents the fuel from foaming and thus maintains optimum fuel injection system performance in all driving conditions.
The engine complies with the Euro 3 exhaust emissions in all Omega body styles and transmission versions. Low emission values are obtained by means of the single-flow

- 4 primary catalytic converter and the main converter. Exhaust gas recirculation is used to reduce emissions of nitrogen oxides. On the station wagon and Omega models with automatic transmission, the sixcylinder engine’s recirculated exhaust gas is also cooled, which further improves exhaust emission quality.
A complete summer and winter testing program was carried out during development of the most powerful Omega diesel engine to date. The auxiliary heater, for example, had to prove its abilities in the cold climate of Scandinavia in the same way as the fuel heater, which prevents the fuel from clogging at Arctic temperatures.
Practical Combination: New Five-Speed Automatic Transmission
Opel is now offering a five-speed automatic transmission for the first time on the
Omega 2.5 DTI. The additional gear ratio ideally matches the torque characteristics of the direct-injection diesel engine. The new five-speed automatic transmission is electronically controlled. Depending on road speed, the driver’s requirements
(accelerator position) and actual engine torque, the optimum gear is selected and activated by the mapped characteristics stored in the control unit. The 2.5 DTI 24V engine’s high power output permits top speeds of up to 208 km/h.
In order to reduce fuel consumption and possible vibration in the drivetrain, the new automatic transmission also has an electronically controlled torque lock-up converter clutch which takes effect automatically in third, fourth and fifth gear, according to the predetermined shift maps. The exchange of electronic signals between the various control devices in the car takes place via CAN bus.
The driver can choose between the Economy, Sport and Winter drive modes, whereby the fuel saving “Economy” mode is activated each time the engine is started. In the
Sport program, the gear ratios are held until higher engine speeds are reached, for maximum acceleration. The Winter program on the other hand assists the standard traction control by helping to prevent the driven wheels from spinning on low-grip, slippery surfaces. As a result, the Omega 2.5 DTI moves off smoothly in third gear.

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The Winter program can be activated in the Economy mode up to a speed of 50 km/h, but cuts out automatically above 80 km/h.
There are three other programs which work behind the scenes to monitor occupants’ safety. The first prevents unintentional down-shifts and violent gear shifts when the traction control is active. The down-shift lock prevents too high an engine speed – for example if the driver tries to force through a gear shift with the selector lever at an unsuitable speed. There is also a reverse gear lock which is activated when moving forward at above 8 km/h. An electro-mechanical lock makes sure that the selector lever can only be moved from the Park position when the ignition is on and the brake pedal is pressed. It is only possible to remove the ignition key in the “P” position.
Safety First: DSA Running Gear with Improved ESP
One of the Omega’s outstanding features has always been its extremely safe DSA chassis (Dynamic Safety) with self-stabilizing elasto-kinematics that keep the car on track even when braking on surfaces with varying degrees of grip. Like all six-cylinder
Omega cars, the 2.5 DTI will have from November on a standard Electronic Stability
Program (ESP) which in especially critical driving situations can further increase the high reserves of safety already offered by the DSA chassis. TC Plus traction control with braking and engine intervention integrated in the ESP and operating in both the traction and deceleration modes also prevents the driven rear wheels from spinning or locking.

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Omega 2.5 DTI: Engine Data and Performance at a Glance
Engine
Cylinders, valves
2.5 DTI 24V
6 inline, 4 per cylinder
Swept volume
Compression ratio
2497 cc
17.5 : 1
Power
Torque
Max. speed (km/h)
Acceleration
0-100 km/h (s)
Fuel consumption
(liters/100 km)
Exhaust emission limit
110 kW/150 hp at 4000 rpm
300 Nm from 1750 to 3000 rpm
Sedan: 208 (206)
Caravan: 200 (200)
Sedan: 10.5 (11.0)
Caravan: 11.0 (11.5)
Sedan: 7.6 (8.6)
Caravan: 7.8 (8.7)
Euro 3
( ) = with five-speed automatic transmission
Fuel consumption: combined according to MVEG test (99/100/EC)