How much power will lose Volkswagen TDI souped without the “defeat device”? Is this video the answer we expect?
Worryingly we insist it turns out that Volkswagen has not yet given clear and precise about what will happen to the TDI affected by the trick of defeat device answers. We not even know for sure how it worked this software manipulating vehicle performance, so that approval conditions act differently to the actual conditions. Hence many customers and are wondering if their TDI lose power or be penalized their consumption, once the correction has been performed on the unit that we all expect. And that has been the motivation that has led to an average American, The Fast Lane Car, to face a Volkswagen Jetta TDI to a bench test roller to see if a power loss occurs when the vehicle believed to be rolling in proof approval. What will be the result of this test?
The premise of the test a priori makes sense. If a test is simulated roller bed of a Volkswagen Jetta TDI in two stages, one in which the car "thinks" that is proof of approval, and another in which the car "thinks" that is rolling conditions real, they could be significant variations in performance. And that variation in performance could lead to another stage. If the car loses benefits when it has been souped approval for a test, it is reasonable that those are their final performance at the time that Volkswagen correct their engines and have always work in the way they created for their approval.
But, as discussed below, this test is not as simple or obvious. And indeed, until we feel that we would sin naive if we thought that the defeat of Volkswagen device has an operation as simple as that.
The first problem is that we do not know exactly how it works Defeat device. The creators of this video have thought about the possibility of programming the PBX interprets the car is in "approval" mode when your front wheels turn, and back no, hence they have emulated their real driving with a roller that rotates the rear wheels. Researchers who identified the presence of the device defeat at West Virginia University thought of another possibility, which is that this device was activated when it detects a pattern of certain accelerations, and no action on the steering wheel was not realized. Intuit that this device has a more advanced system, probably along the lines of these researchers suspected that a control that detects the rear wheels do not spin.
The truth is that, despite everything, in this video apparently have noticed some interesting data. The Volkswagen Jetta TDI would hardly have lost maximum power, as this test alone would have lost 2 CV and some Nm of torque. Please note also that the units listed in this test are consistent with those used in the United States, ie Horsepower (1 hp equals 1,013 horsepower) and torque expressed in feet per pound.
The problem would be located precisely at low-medium, a regime in which the greatest drop in torque occurs and wherein the difference in the achieved power (in "defeat device" and "real" mode) extends to about 15 HP, enough to make the difference is evident in his performance (especially in recoveries).
Honestly, I have my doubts about this test, so I said earlier. But even considering that the test has been right, and have actually made this Jetta work in "souped-up" in real mode, is still too early, too early, thinking that the correction that Volkswagen will bring power reduction and / or require more work than a software upgrade.
different scenarios which may even vary by model that equips the diesel engine open. First, the stage where that adjustment is more than enough software to correct and make these engines comply with the rules for which were approved. In that scenario, it stands to reason that the benefits are modified, we do not know is to what extent it will affect the driving experience, and if the difference will be noticeable, or perhaps negligible. Proponents of this view point to the motivation of Volkswagen engines have been offering compatible with US emissions standards without its benefits fell and offering high performance.
The second scenario is even more complex. Does the defeat device disrupts the engine mapping, or also the operation of devices such as NOx traps? What if this were not enough software patch to fix the problem? And if the theory of cost savings, which would have encouraged illegal Volkswagen to use this technique to prevent the installation of a catalyst based on AdBlue, were true?
In this case the correction may be more complex than that manipulation of software and may require Volkswagen instalase engine souped AdBlue device, which also involves maintenance (remember that devices AdBlue consume this additive based on a urea solution) but not necessarily the loss of benefits. And that, perhaps also worry users of TDI affected, but would also make this video lacked validity and interest.
Source: The Fast Lane Car