Posts Tagged ‘Diesel Cars’
May 6th, 2011 | 
Author: 
Gen Wright asked:
The need for speed of many people has prompted them to ?turbo charge? their cars. So, like in the film Fast and Furious, they?re revving it up where it?s not illegal and they?re having a grand time unless they have forgotten to look after their supercharged engines. Without this nifty gadget called dump valves their turbochargers are prone to damage. That works well with petrol-infused cars. What about turbo diesel dump valves?
First, let?s see what a dump valve does. A dump valve serves as the absorber and of extremely high pressure, which it releases to the atmosphere or back to the inlet. It?s the bypass valve that protects the car?s turbo from taking so much pressure than it can cope with.
When the car is in full acceleration, it creates pressure called boost. When the driver suddenly decelerates, the throttle butterfly closes and air gets compressed but there is no other way for the excess air to get out. The unused boost then goes back up through the intercooler, creating pressure at the rear of the turbo. This pressure acts as a hold on the turbo and tries to prevent it from spinning.
How does it perform its purpose? The dump valve will be the leeway, the escape hatch if you want to put it that way. It releases the pressure in two ways: into the air outside or back to the air intake system.
Atmospheric valves dump the extra boost to into the air giving out a ?whoosh? sound that the riders love. Re-circulating valves dumps back the unused boost with minimal sound.
As a result, this add-on provides significant decrease in turbo spool up time and there is big improvement in the car?s response between gearshifts. Since there is little lag on the turbo, the next boost is timely. This means increased torque at lower revs.
What about turbo diesel dump valves?
If you are asking if you can use a petrol dump valve in your turbo diesel car, the pointblank answer is NO. Petrol dump valves are useless to your car because diesel cars have different engine set-up from petrol turbo cars.
Turbo diesel cars do not have the same throttle plates as in a petrol turbo car that control the engine speed. In a diesel car, the engine requires all the air that the turbo charger can supply. It thrives on compressed air for its cylinders to function optimally. A diesel dump valve will only provide the sound but no additional speed.
Diesel dump valves therefore, are not really needed because your turbo diesel car thrives on the high pressure build up. Should you want to install a diesel dump valve in your turbo diesel car, you only get the ‘woosh’ sound when you change gears.
There isn’t much point in arguing about the need of the dump valves in a turbo diesel car. You could fit them if you want the performance sound but ultimately, it’s down to individual choice and preference as not everyone who drives a turbo diesel wants to fit a dump valve. Some may even find the sound to be repulsive!
Caffeinated Content
The need for speed of many people has prompted them to ?turbo charge? their cars. So, like in the film Fast and Furious, they?re revving it up where it?s not illegal and they?re having a grand time unless they have forgotten to look after their supercharged engines. Without this nifty gadget called dump valves their turbochargers are prone to damage. That works well with petrol-infused cars. What about turbo diesel dump valves?
First, let?s see what a dump valve does. A dump valve serves as the absorber and of extremely high pressure, which it releases to the atmosphere or back to the inlet. It?s the bypass valve that protects the car?s turbo from taking so much pressure than it can cope with.
When the car is in full acceleration, it creates pressure called boost. When the driver suddenly decelerates, the throttle butterfly closes and air gets compressed but there is no other way for the excess air to get out. The unused boost then goes back up through the intercooler, creating pressure at the rear of the turbo. This pressure acts as a hold on the turbo and tries to prevent it from spinning.
How does it perform its purpose? The dump valve will be the leeway, the escape hatch if you want to put it that way. It releases the pressure in two ways: into the air outside or back to the air intake system.
Atmospheric valves dump the extra boost to into the air giving out a ?whoosh? sound that the riders love. Re-circulating valves dumps back the unused boost with minimal sound.
As a result, this add-on provides significant decrease in turbo spool up time and there is big improvement in the car?s response between gearshifts. Since there is little lag on the turbo, the next boost is timely. This means increased torque at lower revs.
What about turbo diesel dump valves?
If you are asking if you can use a petrol dump valve in your turbo diesel car, the pointblank answer is NO. Petrol dump valves are useless to your car because diesel cars have different engine set-up from petrol turbo cars.
Turbo diesel cars do not have the same throttle plates as in a petrol turbo car that control the engine speed. In a diesel car, the engine requires all the air that the turbo charger can supply. It thrives on compressed air for its cylinders to function optimally. A diesel dump valve will only provide the sound but no additional speed.
Diesel dump valves therefore, are not really needed because your turbo diesel car thrives on the high pressure build up. Should you want to install a diesel dump valve in your turbo diesel car, you only get the ‘woosh’ sound when you change gears.
There isn’t much point in arguing about the need of the dump valves in a turbo diesel car. You could fit them if you want the performance sound but ultimately, it’s down to individual choice and preference as not everyone who drives a turbo diesel wants to fit a dump valve. Some may even find the sound to be repulsive!
Caffeinated Content
Posted in Turbo Diesel Cars; Are They Worth Considering? | 
Tags: Absorber, Acceleration, Air Intake System, Bypass Valve, Diesel Car, Diesel Cars, Excess Air, Grand Time, Leeway, Nifty Gadget, Revs, Spool, Supercharged Engines, Turbochargers, Whoosh | 
Comments Closed
John Hartley asked:
DIESELS are still gaining popularity in Europe, thanks to low gas mileage and good performance. The latest diesel cars can take on gasoline engined cars and come out on top!
All turbocharged diesels generate much more torque than gasoline engines, so you get better mid-range acceleration. In other words, from, say, 40-80 mph, a good diesel will see off a good gasoline engine car of the same apparent performance.
Jaguar has introduced a special version of a V-6 2.7 liter diesel that has been developed in Europe jointly by Ford and Peugeot. This is the most advanced diesel around at present, with the brand-new piezo-electric injector operation, the latest common rail injection system and twin turbochargers.
PIEZO-ELECTRIC INJECTORS
What are piezo-electric injectors? Cunning little ceramic devices, and when an electric current is applied they produce a pressure, and so can be used to force fuel into the cylinders. The thing is that they can be operated four times faster than other electro-mechanical injectors so the injector can be opened and closed incredibly quickly. Also, the amount of movement is very small, and you get less noise that you get from mechanical injectors.
Like I said, very cunning, and they all go with high pressure injection to give high power, low noise, emissions and gas mileage. It’s developments like these that mean we’ll have some diesels in Fast-Autos soon – but not a lot!
As a result, the fuel is injected at horrendously high pressures with incredible accuracy. The result? Masses of power, and almost no smoke, the weakness of old-fashioned oil burners, like the dreadful engines GM introduced about 20 years ago.
This new Jaguar S-Type diesel, develops 206 bhp so it lives up to the Jaguar tradition of high performance. Maximum torque is 320 lb ft (430 Nm) which is more than the 4.2 liter gasoline engine can manage without a turbocharger. Although performance is not sensational, it is definitely not what you’d expect from a diesel.
The Jag diesel will push the S-Type automatic up to 60 mph in about 8 seconds, and top speed is 140 mph. You’ll get the idea that Jag regards this as a sporty engine from the fact that it has a six-speed manual or automatic box – both are supplied by ZF. Of course, the most powerful S-Type is the S-Type R.
BMW HAS AN EVEN MORE POWERFUL DIESEL
BMW is also ready with a very powerful 3.0 liter diesel engine which turns out 272 bhp, which would be considered very nice thank you from most makers of 3.0 liter gasoline engines – Ford’s top version of its nice 3.0 liter V-6 develops 225 bhp. BMW uses twin-stage turbocharging to get this much power. In this system, one small turbocharger provides power at low speeds, and a bigger turbo is matched to high speed requirement. It is switched in when the speed and load increase sufficiently, and so can generate as much power as a gasoline engine of the same size.
If that is not enough power consider the latest news. Audi is racing diesel-powered cars at the Le Mans 24-hour race! These V-12 engines develop more than 600 bhp, and will challenge the best gasoline engined sports-racing cars.
Carr
DIESELS are still gaining popularity in Europe, thanks to low gas mileage and good performance. The latest diesel cars can take on gasoline engined cars and come out on top!
All turbocharged diesels generate much more torque than gasoline engines, so you get better mid-range acceleration. In other words, from, say, 40-80 mph, a good diesel will see off a good gasoline engine car of the same apparent performance.
Jaguar has introduced a special version of a V-6 2.7 liter diesel that has been developed in Europe jointly by Ford and Peugeot. This is the most advanced diesel around at present, with the brand-new piezo-electric injector operation, the latest common rail injection system and twin turbochargers.
PIEZO-ELECTRIC INJECTORS
What are piezo-electric injectors? Cunning little ceramic devices, and when an electric current is applied they produce a pressure, and so can be used to force fuel into the cylinders. The thing is that they can be operated four times faster than other electro-mechanical injectors so the injector can be opened and closed incredibly quickly. Also, the amount of movement is very small, and you get less noise that you get from mechanical injectors.
Like I said, very cunning, and they all go with high pressure injection to give high power, low noise, emissions and gas mileage. It’s developments like these that mean we’ll have some diesels in Fast-Autos soon – but not a lot!
As a result, the fuel is injected at horrendously high pressures with incredible accuracy. The result? Masses of power, and almost no smoke, the weakness of old-fashioned oil burners, like the dreadful engines GM introduced about 20 years ago.
This new Jaguar S-Type diesel, develops 206 bhp so it lives up to the Jaguar tradition of high performance. Maximum torque is 320 lb ft (430 Nm) which is more than the 4.2 liter gasoline engine can manage without a turbocharger. Although performance is not sensational, it is definitely not what you’d expect from a diesel.
The Jag diesel will push the S-Type automatic up to 60 mph in about 8 seconds, and top speed is 140 mph. You’ll get the idea that Jag regards this as a sporty engine from the fact that it has a six-speed manual or automatic box – both are supplied by ZF. Of course, the most powerful S-Type is the S-Type R.
BMW HAS AN EVEN MORE POWERFUL DIESEL
BMW is also ready with a very powerful 3.0 liter diesel engine which turns out 272 bhp, which would be considered very nice thank you from most makers of 3.0 liter gasoline engines – Ford’s top version of its nice 3.0 liter V-6 develops 225 bhp. BMW uses twin-stage turbocharging to get this much power. In this system, one small turbocharger provides power at low speeds, and a bigger turbo is matched to high speed requirement. It is switched in when the speed and load increase sufficiently, and so can generate as much power as a gasoline engine of the same size.
If that is not enough power consider the latest news. Audi is racing diesel-powered cars at the Le Mans 24-hour race! These V-12 engines develop more than 600 bhp, and will challenge the best gasoline engined sports-racing cars.
Carr
Posted in Uncategorized |
Tags: Diesel Cars, Gas Mileage, Gasoline Engine, Gasoline Engines, Jaguar S Type, Maximum Torque, Mechanical Injectors, Performance Jaguar, Twin Turbochargers |
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