In early eighties many carmakers started using turbochargers to try to enhance the power of their engines without cutting into mileage. Unfortunately many of the engines at the time still used carburetors or mechanical fuel injection systems. Issues with durability and drivability eventually led to most of these early turbos being dropped.
In recent years, thanks to modern engine management systems, variable valve timing, fuel injection and innovations like variable vane turbos, they are making a comeback. Volkswagen has a whole line of TSI 1.4L turbos that make more power than a 1.6L and consume less gasoline than a 1.2L.
Renault is now following a similar path with their new TCE engine. The French 1.4L turbo engine isn't as powerful as the VW range, only putting out 100hp but when installed in the new Modus model it averages 40mpg on the Euro combined cycle. Unlike the VW, Renault is still sticking with multiport fuel injection instead of using direct fuel injection which leads to the lower power output. The Renault press release is after the jump.
[Source: Renault] PRESS RELEASE
JUNE 8, 2007
The TCE 100hp engine to power Modus
Modus is shortly to become available with the new TCE 100hp petrol engine already seen on models in the Clio III range and on the New Twingo GT. Equipped with a low inertia turbo, it combines the power of a 1.4-litre engine with the torque of a 1.6 yet features the fuel consumption of a 1.2. On Modus, CO2 emissions will be a low 140g/km and this powerplant was developed to stand out as a new benchmark in terms of performance and fuel consumption for this level of power. Modus TCE 100hp goes on sale in France with prices starting from €15,300.
Punch, response and power under the right foot thanks to turbo technology
Developed from the 1.2 16V 75hp block, it is equipped with a low inertia turbo that ensures minimal lag thanks to its small diameter turbine and compressor. Its maximum power of 100hp and peak torque of 145Nm are available at 5,500rpm and 3,000rpm respectively. The marriage of a small cubic capacity and a low inertia turbo ensures lively response from low revs, while maximum torque is available from low engine speeds and remains available across a broad rev-band. The turbocharger includes an "overpower" feature which temporarily boosts power output in 2nd, 3rd and 4th gears at engine speeds of more than 4,500rpm (5hp extra power and 6Nm extra torque).
Some 30 per cent of the TCE 100hp's components are new compared with the 75hp block. The new engine also benefits from several evolutions, notably sodium cooled valves for enhanced resistance to heat, oil jet-cooled pistons and optimized cylinder head cooling. The injectors, sparkplugs and coil are all specific to the TCE 100hp, while its sump is made from aluminium.
The four-into-one exhaust manifold has been carefully designed to optimize the flow of exhaust gases in order to maximize the delivery of energy to the turbine. Meanwhile, a tumble-effect movement of the air inside the cylinders favours combustion speed for enhanced chamber-filling efficiency and improved stability at idle.
A fuel efficient, environmentally-friendly engine
With a cubic capacity of 1,149cc, this small engine enables Modus, New Twingo and Clio III to claim record combined cycle fuel consumption of 5.9 litres/100km, a figure to which its low idling speed of 650rpm contributes. ^
With CO2 emissions homologated at 140g/km, the TCE 100hp engine will also contribute to the "CAFE 2008" commitment made by Renault to be selling one million vehicles with CO2 emissions of less than 140g/km by 2008. This engine is also a response to the anticipated demand for petrol engines compared with small diesels when the Euro5 standard comes into effect in Europe. The TCE 100hp is coupled to a manual five-speed gearbox. It is produced in Douvrin, (France) which has a weekly production capacity of 13,500 1.2-litre engines. Renault invested 80 million euros in its development.
Like Clio III and New Twingo, Modus is now available with the TCE 100hp engine
Modus TCE 100hp will be available in France in a choice of three equipment levels (Expression, Alyum, Privilège) and two limited editions (Alizé, Empreinte). With the petrol TCE 100hp engine under the bonnet, Modus meets the three criteria necessary to qualify for the Renault eco² appellation.
Equipment level Tax-paid prices in France
Limited edition Tax-paid prices in France
Modus TCE 100hp – technical description
Type D4F 784
Cubic capacity (cc) 1,149
Bore x stroke (mm) 69 x 76.8
Number of cylinders / valves 4 / 16
Compression ratio 9.8 : 1
Maximum power kW EEC (hp DIN, rounded
up/down to nearest whole figure) at (rpm) 74 (100) at 5,500
Maximum torque Nm EEC (mkg DIN) at (rpm) 145 at 3,000
Catalytic converter Standard
Type JH3 184
Number of forward speeds 5
Speed at 1,000rpm: in 1st gear 7.61 (11/41)
in 2nd gear 13.85 (21/43)
in 3rd gear 20.36 (28/39)
in 4th gear 27.56 (34/35)
in 5th gear 34.57 (39/32)
Electric power steering Standard
Variable power steering Standard
Turning circle between kerbs / walls (m) 10.4 / 10.9
Front MacPherson type
Rear Flexible beam
WHEELS & TYRES
Wheels (inches) 6-inch J15
Standard tyres 185x60 R 15
Type of circuit X
ABS and Emergency Brake Assist Yes
Servo: twin – diameter (inches) 10
Front: vented discs, diameter (mm) 260
Rear: drums / plain discs, diameter (mm) Drums 203
Top speed (kph) 182
0 – 100kph (s) 11.2
400m standing start (s) 17.6
1,000m standing start (s) 32.9
EEC 99/100 CO2 emissions (g/km) 140
Extra urban cycle (litres/100km) 5
Urban cycle (starting from cold, litres/100km) 7.6
Combined cycle (litres/100 km) 5.9
Fuel tank (litres) 49
Engine oil, including filter (litres) 4
Unladen in running order 1,090
Front axle– unladen in running order 665
Rear axle – unladen in running order 425
Gross vehicle weight (GVW) 1,620
Gross train weight (GTW) 2,200
Braked trailer (within GTW) 900
Unbraked trailer 550