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VW Jetta TDI dyno shows HP loss trying to recreate cheat mode

Volkswagen is working on a fix for diesel-engined vehicles that are out of compliance with emissions regulations in the US and other countries. We're told that engineers will be presenting a solution internally sometime this month, but that doesn't mean we'll actually see it in the wild this month. One big question we have about the coming fix is, will it affect the car's performance? That question relates to another we have about the engine as it is: How much performance would the 2.0-liter diesel lose right now if it were turned down to pass US emissions? The Fast Lane Car tried to sketch some answers by going to a shop in Denver, Colorado to run a 2011 Jetta TDI with a six-speed DSG transmission on an all-wheel-drive dyno. The thinking was that if you ran all four wheels the car would think it was on the road, whereas if you ran only two the car might think it's being tested. We'll get straight to the numbers: the stock sedan is quoted at 140 horsepower and 236 pound-feet of torque. When run with all four wheels turning it produced an uncorrected 114 hp and 214 lb-ft at the wheels. When run with just two wheels in motion the Jetta got 113 hp and 188 lb-ft at the wheels. Reading the graph, we're told that power differences between the two runs were as much as 15 hp and 32 lb-ft. You'll need to take some salt with these numbers, though, because the dyno and test protocol in the video are nothing like those used by the EPA. The shop attempts to trick the Jetta into 'emissions testing mode' by using the front wheels only for the two-wheel-drive run, but we have a feeling the software code at issue is far more sophisticated than that, since the ICCT, UVA, the EPA, and CARB investigated the situation for more than a year and couldn't figure out. Also, the technician adjusts for being a mile above sea level with a correction factor of 1.2 applied to horsepower and torque, which inflates the disparity in the final power differences over the two runs. Go to YouTube and read the lengthy comments on the video left by Andrew Price for a more thorough dissection of what could explain TFL's disparities. You can watch the video above, and feel free to try and dissect the results yourselves in the comments below. Related Video:

VW XL1 priced at $169,000 in UK, only 30 will be sold there

Volkswagen has announced the pricing of its XL1 diesel plug-in hybrid for the UK, according to Car magazine. The small, uber-efficient two-seater will start at GBP98,515, or roughly $168,930 at current exchange rates. Additionally, only 30 units of the XL1 will be sold throughout the UK, giving it a rareness appropriate for its lofty price. It's nice to finally be able to stop speculating about the XL1's price. Even as recently as the first XL1 delivery in Germany, we were still mostly in the dark concerning the cost of the slippery VW. But is the price worth it, especially considering that the much sportier BMW i8 can be had for just a bit more (GBP99,895, or $171,460, in the UK)? Car seems to think so, noting that the XL1 is an eco and technology pioneer, and saying that its cost of ownership is "merely the price of progress." Plus, that includes the bragging rights of owning the world's most fuel-efficient car. The XL1's two-cylinder turbo-diesel engine displaces just eight-tenths of a liter and produces 47 horsepower. The internal combustion engine operates alongside a 26-horsepower electric motor powered by a 5.5-kWh lithium-ion battery pack. Despite its 2.64-gallon fuel tank, the XL1 has a maximum driving range of over 700 miles thanks to a 261-mpg rating (based on the European cycle). Unfortunately, we won't be able to do any bladder-busting, nonstop Chicago to DC road trips any time soon, as VW has no plans to bring the XL1 to North America - not that one would relish the experience of dicing it up with America's massive trucks and SUVs. If you want to drive one, you'll have to go to Europe, and you'd better have a very large piggy bank you're prepared to break open.

VW confirms Audi's emissions test transmission anomalies

Just a week after reports that the California Air Resources Board (CARB) found an emissions cheat in some Audi automatic transmission software programs, parent company Volkswagen has come clean. As reported by Reuters, VW's response to an article by Munich's Sueddeutsche Zeitung stated that the adaptive shift functionality can "lead to incorrect and non-reproducible results." Adaptive shift programs alter the characteristics of a vehicle's transmission to suit different driving styles. Gentle driving will result in earlier shifts and lower engine revs, while hard-charging on the pedals and steering will make the transmission more responsive and hold gears longer. That adaptation can change over time or even on a short-term basis. And it can save fuel. The difference in this case is that is seems that the Audi transmissions were specifically programmed to detect emissions test conditions. As we explained in a previous article, one of those test conditions is keeping the wheel straight. Turning more than 15 degrees shuts the test mode off. According to Reuters, the US government is trying to determine whether this classifies as an emissions cheat device, although VW, Audi, and the EPA have not commented on the record. This latest accusation is separate from the larger VW diesel emissions scandal. Related Video: Image Credit: Getty Editorial Government/Legal Green Audi Volkswagen Emissions vw diesel scandal