Performance comparison between Centura and WRX
1976 Chrysler Centura |
2001 Subaru WRX |
Negative Supercharging Kit � Stage 4 |
Turbocharged |
| Induction |
Hot Air Induction |
Cold Air Induction |
| Engine Size |
245ci (4L) |
122ci (2L) |
| Engine Type |
6 cyl OHV |
4 cyl DOHC |
| Compression Ratio |
9:1 |
8:1 |
| Fuel System |
4BBL Carburetor |
Fuel Injection |
| Computer |
NO |
YES |
| Camshaft |
Flat-tappet cam |
4 roller cams |
| Valves |
2 valves per cylinder |
4 valves per cylinder |
| Intake Manifold |
Short runners |
Long runners |
| Torque / hp @ 1500 rpm |
370 lbs/ft / 106 hp |
90 lbs/ft / 26 hp |
| Torque / hp @ 2500 rpm |
370 lbs/ft / 176 hp |
170 lbs/ft / 81 hp |
| Torque / hp @ 3500 rpm |
370 lbs/ft / 246 hp |
200 lbs/ft / 133 hp |
| Peak Hp |
250 hp @ 4000 rpm |
215 hp @ 5600 rpm |
| Transmission |
3 speed auto |
5 speed manual |
| Converter Stall |
2000 rpm |
N/A |
| Diff Ratio |
2.9 |
3:9 |
| Gear Multiplication |
NO |
YES |
| Drive |
2WD |
4WD |
| 0-62 mph (0-100 kph) |
5.1sec |
6.9 sec |
| 1/4 mile (400m) |
13.9 sec |
14.9 sec |
| Average Fuel Mileage |
28 mpg (10.1 L/100 km) |
23 mpg (12.3 L/100 km) |
| Vehicle Weight |
2,625 lbs (1,190 kg) |
3,065 lbs (1,390 kg) |
Acceleration and fuel mileage produced by the stage 4 Negative Supercharging Kit can be substantially improved with the addition of...
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Impulse ram intake manifold from stage 6 Kit
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Impulse roller cam from stage 7 Kit
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Gear multiplication
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Fuel injection
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Therefore, when Negative Pressure Supercharging is used in conjunction with a ram intake manifold, gear multiplication, roller cam and fuel injection, it makes a mechanically simple 245ci (4L) 6 cylinder engine produce much faster acceleration and a lot more fuel mileage than today's mechanically complex turbocharged 122ci (2L) 4 cylinder engines.
For example,
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13.2 sec ET with the addition of...
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Impulse ram intake manifold
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Acceleration of the 245 Hemi 6 Centura can be increased by adding the Impulse ram intake manifold (long runners) to the stage 4 Kit. This will increase torque to 440 lbs/ft from 1000�3500 rpm and produce a faster 1/4 mile time of 13.2 sec.
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12.7 sec ET with the addition of...
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Acceleration can be increased even further by adding a 4 or 5 speed gearbox with overdrive and a 4:1 diff ratio to the Centura in conjunction with the Impulse ram intake manifold to produce an even faster 1/4 mile time of 12.7 sec.
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12.3 sec ET with the addition of...
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Acceleration can be increased even further again by adding the Impulse roller cam to the 245 Hemi 6 in conjunction with the 4 or 5 speed gearbox with overdrive, 4:1 diff ratio and Impulse ram intake manifold. This will increase torque to 480 lbs/ft from 1000�3500 rpm and produce an even faster 1/4 mile time of 12.3 sec.
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31 mpg with the addition of...
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Impulse ram intake manifold
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Gear multiplication
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Average fuel mileage will also improve to 31 mpg with the ram intake manifold, 4 or 5 speed gearbox with overdrive and a 4:1 diff ratio.
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36 mpg with the addition of...
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Average fuel mileage will increase even further to 36 mpg by adding fuel injection in conjunction with the ram intake manifold, 4 or 5 speed gearbox with overdrive and a 4:1 diff ratio.
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| Impulse Engine Technology
P/L |
PO Box 986 Randwick NSW 2031 Australia
Ph: (02) 9398 5544
Fax: (02) 9398 5644
International: Ph: +(612) 9398 5544
Fax: +(612) 9398 5644
Email Us
Inventor of Negative Pressure Supercharging
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