2002 Jetta 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:

Tanner Foust drifts Rockstar Passat around US Cycling TT course

The USA Cycling Time Trials take place on Saturday in Chattanooga, TN. That's also where Volkswagen has its US headquarters. So in honor of the event, VW decided to have a little fun involving Tanner Foust and a 900-horsepower Rockstar Drift car. That's a 900-hp Passat, by the way. Pro cyclist Tim Johnson rides along with Foust, showing him the intricacies of the cycling TT course. But of course, with a 900-hp drift car at his disposal, Foust makes use of roundabouts and turnaround points to do what he does best. We won't spoil the rest of the short, minute-and-fifteen-second video posted above. But if you like smoky drifts from super-modified midsize sedans, this clip is for you.

Volkswagen Golf Wagon caught completely uncovered

Without a lot of information to go with them, our camera-toting spies have captured some new images of a Volkswagen Golf wagon variant that is almost completely undisguised. In fact, the one piece of camouflage on the tidy wagon would probably have gone unnoticed to most casual viewers. Look closely at the rear three-quarter view of the car and you'll notice that the apparent taillight clusters are actually fakes - the outline of the real units is faintly visible behind the blue bodywork and the sticker-like fake taillights.
It's a good guess then, that this Golf wagon (called a Golf Kombi by our spy photographer) is a prototype that's pretty far along in the development cycle for Volkswagen. We can't be sure what impact this will have on the company's small wagon offering here in the US, but we'd be pretty surprised if something very like this didn't end up as the next Jetta SportWagen. We might well have more information on that front, after we visit Geneva next week.