1973 Volkswagen Beetle - Classic 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:

2013 Volkswagen Jetta Hybrid

More Fun Than A Prius, Less Sensible Than A TDI
Let's have some fun, and do some math. We're talking pretty rudimentary stuff, multiplication and division, to figure out if the upcoming Volkswagen Jetta Hybrid can make a baseline case for itself against two very strong competitors in this segment. The competitors in question, at least for now, are two more Jettas: the diesel-drinking TDI and the fit-for-the-masses SE with VW's long-serving 2.5-liter engine.
To keep the equations clean and simple (hey, we're writers), we'll calculate based on the most flattering EPA miles per gallon stat from highway driving for all cars, assume a healthy 20,000 miles driven per year, and factor in today's average cost for the respective fuels these three require: diesel (TDI), regular (SE) and premium (Hybrid). We'll also start with the base prices for all models.

Get ready to Camino-ize your fourth-generation VW Jetta with this kit

Inexpensive, small pickup trucks used to be everywhere in the US, whether they were from Japanese brands like Datsun or Toyota, the truly weird Subaru Brat or even from Europe with the Volkswagen Caddy based on the Golf. These days that market has completely disappeared, but if you're willing to pick up some tools to build your own, there's a company out there bringing the Caddy back as a kit for the Jetta.
Mark Smith knows a thing about building a vehicle at home. He has over two decades in the DIY-car business as a co-founder of Local Motors and the company that became Factory Five Racing. His latest venture is Smyth Performance and already offers a mid-engine, VW-based kit called the G3F. His new product, though, started as a fluke. "I just wanted a shop truck," said Smith to Autoblog. He already had a Ford F-450 but found that he was driving around with the bed empty most of the time. The result was a pickup truck based on the fourth-generation Jetta that he dubbed the Ute.
The kit retails for $3,500 and ships in three, big boxes, and it's designed to be built and painted in a weekend. Buyers get fiberglass exterior panels, a fiberglass rear window surround, sliding rear window, an aluminum reinforced bed with a tubular steel subframe, taillights, a fully functional steel tailgate, and other parts. In the end, you get a vehicle with a six-foot bed and a payload of around 700-750 pounds. The Ute maintains all of the factory suspension, fuel tank and emissions equipment and requires just a few cuts in the body to complete. "We did a modern Caddy," admits Smith.