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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old December 5th, 2011, 08:09   #1
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Join Date: Sep 2011
Location: Virginia
TDI(s): 2012 Passat
Fuel Economy: [URL=http://www.fuelly.com/driver/Olivia/passat][IMG]http://mefi.us/images/fuelly/sig-us/92859.png[/IMG][/URL]
Default Digital Tuning Box for 2012 Passat?

I'm a novice TDI user and just now getting into making modifications and I'm intersted in installing a digital tuning box on my 2012 Passat TDI (for the SOLE purpose of increasing fuel economy on cross-country drives).

To be clear, I'm NOT in search on that that increases rail pressure (due to high rate of rail failures already). So to all you TDI gurus out there, which model(s) do you suggest I take a look at?

Last edited by physicshogon; December 5th, 2011 at 11:23.
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Old December 6th, 2011, 23:56   #2
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Join Date: Mar 2001
Location: Newtownards, N. Ireland
Fuel Economy: 38.5- 47 Forester, Citroen 55- 63

the only boxes I can tink of that aren't rail-pressure are from PSI; they intercept the injector signals instead.
But whether one is available to suit the revised injection system on the new US Passat I have no idea...

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Old December 7th, 2011, 00:32   #3
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Join Date: May 2010
Location: Cape Fear area, NC
Fuel Economy: 46@75mph/51@60mph/City 38mpg

Just keep your foot out of it. Diesels are fuel throttled engines (unlike air throttled gasoline engines), the new Common Rail Engines run ultra-lean as it is during steady state highway driving, you control all fuel entering the combustion chamber with the pedal, the biggest impact on fuel economy is how you drive it. Get a Scangauge II and you can easily see this by monitoring fuel flow.

For example, I have a Revo tune (http://www.revotechnik.com) for my car, it's good for an additional 45HP and 53 ft/lbs of torque and the fuel economy shows it when I request power (i.e. by putting the pedal all the way down), however if I drive normally, for instance on cruise control at highway speeds, the tune has zero impact on my fuel economy over the stock ECU tune.

Search the site here, there are several lengthy threads on the topic, search for "hypermiling".
'10 Jetta 6M Sedan, 35% Llumar tint, WeatherTech Floor Liners, TDIclub Plate Frame, B2, PS, ScanGauge II, Micro-Can VAG-Com

Last edited by tcp_ip_dude; December 7th, 2011 at 00:49.
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