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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 brings back the bus, and Jeep might be on the block | Autoblog Podcast #524

On this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Associate Editor Joel Stocksdale. We discuss the week's news including the introduction of the VW T-Roc, the confirmed production of the VW I.D. Buzz and the Hyundai Santa Cruz truck. We also cover the cars we've been driving, talk about whether the Woodward Dream Cruise is better than the Pebble Beach Concours, and we try to spend your money. The rundown is below. Remember, if you have a car-related question you'd like us to answer or you want buying advice of your very own, send a message or a voice memo to podcast@autoblog.com. (If you record audio of a question with your phone and get it to us, you could hear your very own voice on the podcast. Neat, right?) And if you have other questions or comments, please send those too. Autoblog Podcast #524Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Topics and stories we mention Rundown Volkswagen T-Roc reveal Volkswagen I.D. Buzz confirmed for production Chinese automaker interested in FCA and Jeep Ferrari celebrates 70th anniversary at Pebble Beach Hyundai Santa Cruz confirmed for production What we're driving Unpopular opinion Spend My Money Feedback Email – Podcast at Autoblog dot com Review the show on iTunes

Golf tees up new sales for VW

If you consider the Passat and the CC two different lines, Volkswagen USA lists nine different models on its website, and they have sold a total of 238,074 units in the US this year through the end of August. The Golf, which was voted North American car of the year in 2015, and its variants account for 44,416 sales, an increase of nearly 150 percent compared to the same period last year. That's also the most Golfs ever sold in that time in the US, and almost 19 percent of this year's entire brand sales. This is compared to a compact car segment that has gained just 1.1 percent compared to 2014. A number of factors are responsible, according to a report in Automotive News: the MQB platform allows different powertrains to roll down the same assembly line; VW USA product planners can now configure vehicles to suit our market and they work with a selection of dealers to refine the retail offering; and the Golf maintains its proper European driving experience. The expanse of the Golf range has meant not only increased profits and new buyers, but more breadth in the buying demographic - expanding outward from the standard Golf to five different extremes, from the e-Golf to the Golf R. Room will be made for a new kind of consumer next year when the current Sportwagen model goes all-wheel drive with an Alltrack designation. Unsurprisingly, VW USA says, "Golf is a role model for the US for us. We want to learn from our success and implement those lessons in our future model planning." After decades of uneven effort, perhaps that formula plus a long-awaited range of crossovers can finally deliver on the promise of the US market. Related Video: