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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:

Autoblog Podcast #389

Episode #389 of the Autoblog podcast is here, and this week, Dan Roth, Chris Paukert, and Mark Pereira from Autoblog Canada talk about Johan deNysschen's move to Cadillac, rumors of more BMW nomenclature changes, a second generation for the Subaru BRZ, and cars from 2004 that we miss. We start with what's in the garage and finish up with some of your questions, and for those of you who hung with us live on our UStream channel, thanks for taking the time. Check out the new rundown below with times for topics, and you can follow along down below with our Q&A. Thanks for listening! Autoblog Podcast #389: The video meant to be presented here is no longer available. Sorry for the inconvenience. Topics: Johan de Nysschen moves to Cadillac BMW model designations changing even more Subaru BRZ getting second generation Cars We Miss In the Autoblog Garage: 2014 Ducati 899 Panigale 2015 Hyundai Sonata 2015 Volkswagen GTI 2015 Chevrolet Silverato 2500 Diesel Hosts: Dan Roth, Chris Paukert, Mark Pereira Runtime: 01:59:10 Rundown: Intro and Garage - 00:00 Johan deNysschen - 36:12 BMW Nomenclature - 53:58 BRZ - 56:27 Cars We Miss - 01:05:07 Q&A - 01:30:09 Get the podcast: [UStream] Listen live on Mondays at 10 PM Eastern at UStream [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 in iTunes Auto News Hirings/Firings/Layoffs Podcasts BMW Cadillac Chevrolet Hyundai Subaru Volkswagen

VW ID.4, the new Buick Envision and crossing Hyundai's N Line | Autoblog Podcast #668

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Associate Editor Byron Hurd. It's a review-packed episode this week, but it kicks off with a discussion of Volvo's plans to electrify by 2030 and move their EV sales online. From there, they get into Greg's time with VW's game-changing new ID.4 electric crossover. Byron then talks about his time with two very different new vehicles: the 2021 Buick Envision luxury crossover and the 2021 Hyundai Sonata N Line, which may or may not be a sport sedan. Finally, they tackle a fascinatingly complex twitter question: What is the best 'economy' muscle car? Autoblog Podcast #668 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 News Volvo introduces 2022 C40 Recharge crossover, announces all EV sales will be online-only What we're driving 2021 Volkswagen ID.4 2021 Buick Envision  2021 Hyundai Sonata N Line Reader question What is the best 'economy' muscle car?  Feedback Email – Podcast@Autoblog.com Review the show on iTunes Autoblog is now live on your smart speakers and voice assistants with the audio Autoblog Daily Digest. Say “Hey Google, play the news from Autoblog” or "Alexa, open Autoblog" to get your favorite car website in audio form every day. A narrator will take you through the biggest stories or break down one of our comprehensive test drives. Related Video: Auto News Green Podcasts Buick Hyundai Volkswagen Volvo Green Automakers Electric Future Vehicles Sedan