what HP increase could a 2012 passat TDI from a tune?

iboomalot

Active member
Joined
Oct 27, 2004
Location
OKC , Okla
TDI
2006 jetta dark blue DSG
my 2006 TDI jetta really liked the tune I got.

What about the new Passat ? It seems to have the stock 140hp/236tq motor what can I get from a tune on that engine?


Thanks
 

Farfromovin

Torque Addict
Joined
Apr 9, 2005
Location
Ventura, CA
TDI
03 Golf 2dr- PD150 6m
Should be the same as all the other CR motors. Check out malonetuning.com for one option. He's just the only guy I know who is actively tuning those ECU's. Might not be as much of a bump as your Jetta was as tuners have to be a little careful about the emissions devices on the new motor.
 

WVU TDI

Veteran Member
Joined
Jul 14, 2007
Location
Beckley, WV
TDI
2013 Passat SE 6m
Should be the same as all the other CR motors. Check out malonetuning.com for one option. He's just the only guy I know who is actively tuning those ECU's. Might not be as much of a bump as your Jetta was as tuners have to be a little careful about the emissions devices on the new motor.
If anything, it seems to me the Passat should respond BETTER to tuning due to a lack of DPF.
 

TDIMeister

Phd of TDIClub Enthusiast, Moderator at Large
Joined
May 1, 1999
Location
Canada
TDI
TDI
Sigh misinformation is rife. The Passat DOES have a DPF and it DOES have a NOx trap, but the latter works on different technology in the Passat. In the latter, called SCR (selective catalytic reduction), the urea-based DEF acts as the reducing agent; in the Jetta, NOx is converted in what's called an LNT (lean-NOx trap) by alternating accumulation/release/conversion cycles with periodic operation in rich fuel-air mixture mode and the resulting unburned hydrocarbons in the exhaust stream act as the reductant.

The fuel-rich mode to regenerate the LNT is why engines using this NOx aftertreatment technology suffers a fuel-economy penalty. SCR doesn't use this mode, hence no associated penalty. But there IS still a NOx catalyst.

Edit to add link: http://www1.eere.energy.gov/vehiclesandfuels/pdfs/deer_2006/session7/2006_deer_dorenkamp.pdf
 
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Mike_V

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Joined
Aug 13, 2010
Location
Santa Barbara, CA
TDI
2003 Jetta Wagon
TDIMeister, I (very possibly mistakenly) had thought that post-combustion injection was used to burn off particulates accumulated by the DPF. Is this not true? And if not, will the Passat have any post-combustion injection cycles? Seems this could have very important ramifications for high-percentage biodiesel use.
 

xcdhracer15

Veteran Member
Joined
Jun 21, 2009
Location
maine
TDI
99 audi a4 ahu, 02 dmax twin turbo
TDIMeister, I (very possibly mistakenly) had thought that post-combustion injection was used to burn off particulates accumulated by the DPF. Is this not true? And if not, will the Passat have any post-combustion injection cycles? Seems this could have very important ramifications for high-percentage biodiesel use.

post injection is used to keep exhaust temps up which help with all of the above
 

TDIMeister

Phd of TDIClub Enthusiast, Moderator at Large
Joined
May 1, 1999
Location
Canada
TDI
TDI
^ Also incorrect. The LNT/SCR have their optimum conversion/regeneration efficiency at a much lower temperature than that required for the DPF (200-400°C vs approx. 600°C or more). See the link in my post above, slides 17, 24. In fact, exposure to temperatures of 750°C or more "ages" the catalyst and permanently diminishes its conversion effectiveness in a fairly short period of time that mimics the aging process in a car after thousands of km (slides 17, 20, 24 and finally 19).

  • DPF regeneration requires lambda > 1 and high temperature (post-injection);
  • LNT regeneration requires lambda < 1 and low- to moderate temperature (intake throttling);
  • SCR does not need any particular engine-side calibration measures (except urea fluid consumption is proportional to the engine-out NOx emissions that must be reduced, so it's in the interest of the calibration to generate as little engine-out NOx emissions as possible in the first place, mainly via EGR and injection strategy);
  • De-SOx catalyst regeneration requires lambda < 1 and high temperature (likely some combination of intake throttling and post-injection).

The temperatures quoted above for NSC (NOx Storage Catalyst, analogously LNT) are different than those quoted in the 2006 DEER paper owing to likely different catalyst formulations from 2 years of development separating both publications, but the ranges and overall points made are still valid (picture is from MTZ 06|2008 Volume 69).

After all is said, this does not answer the original poster's question. The clarifications of the presence/functions of the DPF and LNT/SCR catalysts are important, but from a performance standpoint it can be expected that the SCR-equipped Passat can be tuned at least the same performance levels (other factors like turbocharger matching, boost pressure and fuel injection rates being assumed comparable) to the LNT-equipped Golf/Jettas, without the associated fuel consumption penalty for LNT regeneration but at the expense of likely increased DEF consumption.
 
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deucelee

Veteran Member
Joined
Jul 8, 2011
Location
Central WI
TDI
'11 Jetta TDI 6MT ___ Plat Gray on Black
Actually $550 for a 30hp boost and 70lb torque gain doesn't sound that bad. Other options are also good to know tho...any?
 
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