2014 Volkswagen Gti Driver's Edition on 2040-cars

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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:

Car Club USA: Waterfest

Car Club USA travels back to Englishtown Raceway Park for Waterfest, a celebration of water-cooled Audi and Volkswagen cars. We catch up with a pair of VW autocross contestants racing for top prize, and a young Audi owner hoping to win best in show for the Garden State Euros car club. "It's massive," explained Garden State Euro's Ryan Topken. "You have tons of vendors, tons of events going on. There's the show. There's the drag strip. There's autocross." "It's pretty much like a frat party for Volkswagens," added fellow club member Carlin Belkowski. Will the guys from Garden State Euros head home with any hardware? Each Car Club USA episode features a different car club or event from across the US, where passionate owner communities gather to share automotive experiences and embark on incredible adventures. From Main Street cruises to off-road trails, catch all the latest car club activity on Autoblog.

2022 Acura MDX and a trio of lovely sedans | Autoblog Podcast #662

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Road Test Editor Zac Palmer. This week, they talk about the cars they've been driving, including the 2021 Volkswagen Arteon, 2021 Kia K5 GT, 2022 Acura MDX and long-term 2021 Acura TLX. In this week's news, they talk about the possibility of a Nissan Xterra return and break down what's going on over at Lotus — the British sports car company is axing its current lineup and replacing the Elise, Exige and Evora with a new car called the Type 131. Autoblog Podcast #662 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 What we're driving:2021 Volkswagen Arteon 2021 Kia K5 GT 2022 Acura MDX 2021 Acura TLX A-Spec News Return of the Nissan Xterra nameplate? Lotus Type 131 replacing the entire Lotus lineup Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: