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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:

What's big at the Chicago show | Autoblog Podcast #503

On this week's podcast, Mike Austin and David Gluckman discuss the big debuts at the 2017 Chicago Auto Show. They also recap what they've all been driving lately, and the episode wraps up with Spend My Money buying advice to help you, our dear listeners. And there's an awful Dad Joke thrown in there for you to find. 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 at autoblog dot 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 #503 The video meant to be presented here is no longer available. Sorry for the inconvenience. Topics and stories we mention Jaguar XE Volkswagen Golf R Toyota Highlander Hybrid Chicago Auto Show coverage Used cars! Rundown Intro - 00:00 What we're driving - 01:46 Chicago show preview - 22:58 Spend My Money - 35:36 Total Duration: 52:48 Get 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 Feedback Email – Podcast at Autoblog dot com Review the show on iTunes Podcasts Chicago Auto Show Chevrolet Dodge Jaguar Toyota Volkswagen Truck Hatchback SUV Performance Sedan ford expedition jaguar xe volkswagen golf r 2017 Chicago Auto Show

VW diesel scandal: South Korea could be next

To no one's surprise, there are constant new developments in the VW diesel scandal. We hit the main points in a number of posts recently, but there were other, smaller developments that we didn't put into their own post. Instead, we've collected them here. For our complete coverage of this issue, click here. There's a lot to digest, so here goes. To try and keep dealers happy, VW announced that it guarantee bonus payments to its US dealers this month worth $300 for every new car sold ($600 for each Passat). The automaker is also going to guarantee payments from the company's customer experience bonus program. A memo from VW's US chief Michael Horn said, "We understand the pressure these recent events have put your business under and we are committed to providing you support," according to Automotive News. You can see Horn speaking at an event Monday night above. There will be at least one more official investigation into just how widespread this issue. South Korea has now said it will look into the emissions numbers for around 4,000-5,000 cars there. The affected TDI engines can be found in two VW and one Audi models (Jetta, Golf and A3) in South Korea. In the US, there could be another investigation as well, since Senator John Thune, (R-SD), the chairman of the Commerce, Science and Transportation Committee, has asked the Federal Trade Commission to take a closer look. A scandal this big is not only going to affect VW. To get ahead of any possible criticism, Bosch has issued a statement saying that yes, it does make parts for the 2-liter, 4-cylinder TDI engine that is at the heart of the problem. But, in a statement emailed to Reuters, said, "We produce the components after specification of Volkswagen. The responsibility for application and integration of the components lies with Volkswagen." Looking ahead, VW said in a new statement (available below) that its new EU 6 diesel engines do, " comply with legal requirements and environmental standards." That means that, supposedly, there's no "defeat device" needed to make these engines clean enough to pass strict environmental regulations. That'll be important if VW wants to keep marketing diesel as a clean fuel. For now, the tide seems to be turning against the automaker. Volkswagen AG has issued the following information: Volkswagen is working at full speed to clarify irregularities concerning a particular software used in diesel engines.