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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:

Translogic 171: EV West Karmann Ghia Electric Conversion

Translogic checks out EV West, one of the world leaders in electric vehicle conversions. Host Jonathon Buckley interviews EV West owner Michael Bream and test drives a converted 1969 Volkswagen Karmann Ghia. What drives EV West to electrify classic cars may surprise some. "We're not doing this because we're the hardcore environmentalists or we're trying to save the earth," says Bream. "If we can't at least double your horsepower and torque, we won't touch the car." In fact, EV West brings a race-tested performance pedigree to back up those boasts. The company competed in the electric class at Pikes Peak, has run through the desert at Baja, and in general has successfully proved that battery-electric vehicles can compete at a high level. Have an RSS feed? Click here to add Translogic. Follow Translogic on Twitter and Facebook. Click here to learn more about our host, Jonathon Buckley. Green Volkswagen Electric Translogic Videos electric conversion ev west

VW Golf R, Ram Power Wagon and Subaru Forester | Autoblog Podcast #591

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Consumer Editor Jeremy Korzeniewski and Road Test Editor Reese Counts. After some talk about sponges and other randomly received oddities, this episode is all about the cars we've been driving, including the new Subaru Forester, VW Golf R (which is going on hiatus), BMW M340i xDrive and Ram Power Wagon. Then, they take to the mailbag to help a listener pick a sporty new car in the "Spend My Money" segment. Autoblog Podcast #591 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 Rundown Sponges, really? 2019 Subaru Forester Sport 2019 Volkswagen Golf R 2020 BMW M340i xDrive 2019 Ram 2500 Power Wagon Spend My Money Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: