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VW Shows New Jetta TDI Clean Diesel at LA Auto Show

At the Los Angeles Auto Show, Volkswagen of America, Inc. introduced its new 2.0L four cylinder TDI engine that will be available in Jetta sedan and SportWagen body styles in 2008. The Tier 2 Bin 5-compliant 2009 model year Jetta TDI, equipped with the clean diesel engine option, will be available in all fifty states. (Earlier post.)

The new engine meets the Tier 2 Bin 5 standards with the use of urea injection for Selective Catalytic Reduction. Instead, a nitrous oxide storage catalyst reduces NOx emissions by up to 90%. The engine management system changes operating modes to periodically treat the NOx stored in the catalyst. A particulate filter further reduces emissions, allowing this new clean diesel to be held to the same standards as gasoline models.

In the Jetta application, this sixteen valve engine will produce 140 hp (104 kW) and 235 lb-ft (319 Nm) of torque. Featuring a common rail fuel supply and high pressure injectors, smoothness and drivability have been greatly improved over previous Volkswagen diesel engines.

Volkswagen engineers report that customers can expect “real world” fuel economy to be increased by more than 30%, in comparison to an identical gasoline model. This advanced diesel technology will be available in 2009 Jetta models in the third quarter of 2008—a delay from the earlier projected arrival in spring 2008. Pricing for this new model has not yet been established.


Chris Adams

The '09 Jetta TDI, along with most other newfangled 4 cylinder diesels from Honda to Mercedes do **not** need urea injection to meet tire2 bin5 standards.

In fact if you read the paragraph it look like someone deleted the "not" -witness the sentence following and you will see that the sentence begins with "instead" suggesting that some technological wizardry is afoot.

And indeed it is. Nitrogen is fixed from the atmosphere with a special catalyst and it's converted into ammonia which is key to reducing the nitrous oxides enough to meet the required standards. No urea necessary.


I wonder why they went from 100 HP like in my TDI to 140 HP. Is the engines torque rating down so much that it needs so much extra HP? Is it just A marketing thing?

Bike Commuter Dude

I highly doubt the torque rating has been reduced at all. If anything, VW probably increased either the maximum boost pressure, or the compression ratio, or both. This would result in an increase in both power and torque ratings. In addition, I suspect that the injection pressure has been increased as well, which allows more fuel to be added to the mixture, once again increasing both power, and torque.

Bike Commuter Dude

Further: The 2003 1.8 liter turbodiesel in the Jetta made
100 hp and 154 lb-ft of torque. The 2008 2.0 liter turbodiesel makes 140 hp and 235 lb-ft of torque.


The engine that WV put into the 2005 Beetle/Jetta/Golf (like mine) was A 1.9 liter that puts out 100HP and 177 FT/LBS torque. I'm pretty sure there is no way that they increased the fuel pressure as the pumpe duse engine already sprays fuel at over 30,000 PSI.
I'm just wondering why they would increase the horsepower by 40% the same model of vehicle.
Does the new system not work well at full engine load, therefore they put in an engine that will allow a lot higher percentage of part load operation?


It will have everything to do with the turbo and possibly the programming of the engine management system.

I dare say the engine has been made to produce 140bhp to make it more attractive to the market over petrol models.

Personally 100bhp would be ok on the flat and for cruising, but there would be times that you would look for extra power to give extra kick when you need it.

An increase in horsepower makes a car much more driveable. Its much better for acceleration, which is handy for merging off a slip-road onto a motorway or for safer, quicker overtaking. Good torque and horsepower also make for better driving uphill, especially when the car is fully laden.

I own a 150bhp 1.8 petrol turbo Passat, and its a dream to drive because of the turbo, extra torque and power. Of course, this is no excuse to drive everywhere with a lead foot. If anything, a turbo driven engine, if tuned properly can deliver fuel savings if they are driven respectfully. Put it this way, I've had up to 40miles/USgallon in my Passat.

My next choice in future will be a used 130bhp TDi Passat, which are also meant to be the business for performance and economy.


I cannot wait to get 2 new TDI Jettas next year.
A sedan for myself and a sports wagon for my wife.
Hurry up VW...pleae.




I suspect that the 40% increase in HP was spec'd just for the US market.... and is part of VW of America's plan of increasing fleet fuel consumption year over year. (2.5l 5cyl base Rabbit, 350HP Touareg V8 + Touareg V10 TDI)

Notice how they compare the fuel consumption to the petrol model not the prior diesel.

Thanks VW.

**Perhaps VWoA should change its name to ReichWagon. (Empire's Car) **


In spring of 2008 I will be one of the first in line to get one of these new tdi's. Mid 40's mpg city mid 50's hwy. . On top of that plenty of HP and torque what more could you ask for in a commuter car.

Raymond Brewer

I think I have the answer to the big mystry of how the horsepower has been increased to 140. If you research the new engine I think you will find that it has sixteen valves whereas the previous ones had only eight.


This looks to be excellent. Can't wait til it's released.

jim mahood

This new engine is EXACTLY what I need. I have a 90hp beetle. I have pulled many long grades producing 95% power for up to seven minutes at a time. I have a small trailer (weight wise) and a motorcycle (530ibs). 100hp would be better but TORQUE is the real world of power development. This new 235ft/lb is simply massive for a 2.0L engine. HP is the "rate" or speed at which torque is produced. You can multiply the "time" by 154ft/lbs or 177ft/lbs...but I would rather multiply it by a massive 235FT/LBS!!! That and that alone is the physical force being applied to the crankshaft. This translates or "multiplies" into bigger HP numbers automatically. The difference to real world drivability is significant. The other thing not fully shown by the HP numbers is what happens with headwinds, passengers, luggage, etc to REAL WORLD fuel consumption. It takes many more pounds (gallons) of fuel to move the same weight with gasoline compared to diesel. Many "high horsepower" gas engines fall flat on their face when confronted with heavy loads. Diesel has always outgrunted and outpulled on less fuel any gas engine combination. Pick any number of cylinders, displacement, fuel delivery, transmissions, gear ratios, etc...it doesn't matter, diesel easily outperforms in consumption and pounds moved down the road. The reason is simple. Diesel burns "relatively" slower than gasoline. Gas has a quick "bang" at top dead centre. Diesel keeps burning throughout the entire downstroke. That mechanical advantage produces more torque or twisting power to the crank. It is like arm wrestling. The mechanical advantage increases greatly past 45 degrees on the downstroke. No gas engine, hybrid, jet engine, etc can compare. The only greater torque is from a steam engine, but they are far more cumbersome and therefore outdated. That in a nut shell is why europeans and many other continents have gone the diesel route FOUR DECADES AGO!! Because we have such abundant supplies of oil, oil companies, manufactures, governments,etc all have a stake in dumbing us down to keep driving vehicles that wear out sooner; hence the north American ignorance of simple science and economic wisdom. We get conned with BS environment scares, extreme polution requirements. All vehicles are so clean today, it is laughable to intellegently talk about "environmental disaster". Hybrids are another joke. Oil & the industrial revolution positively changed the future of mankind. Diesel engines and all the engineers behind it...is nothing short of brilliant. The larger truth is, if we "all do are part" to "conserve" fuel...the prices will just go up to make more taxes & profits. THERE IS NO FUEL SHORTAGE...AT ALL. Remember that! If you forget everything I wrote...remember this, "there is no fuel shortage". None, nada, nil, it is a con. Forget the news, forget the papers, most of them have limited intellectual capacities at best. Think for yourself and surround yourself with real people who tell the truth. Buy a fuel efficient and powerful diesel FOR YOURSELF!!, so you keep more of YOUR MONEY. Just be wise. Keep it simple. Jim

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