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I've read something once about putting a little bit of diesel in the gas tank with gas....I forgot what it was for though....seems wrong to me.
The other way around.. to prevent freezing..
 
We used to do it with old diesel farm tractors and pick ups. A LITTLE gas helps the diesel from not jelling so bad, helps the engine start easier and heat up quicker. The last vehicle I can remember doing it on was our 1996 Dodge Ram Cummins and that engines at 350+miles. ........you should not add gas to the newer diesels in any amount. It's not really the engine that will go bad it's the fuel pump that will go bad.
 
oops lol, my apologies, I NEVER want to mix that up lol. im glad I asked. That is a pretty cool backyard kind of repair thing lol. I wonder who first came up with the idea, it is bordering on brilliant lol.
 
Totally agree with everything here...IMO You need to tune the V10 - then it wakes up. When I owned my V10 I found it OK, but not incredible...tune it and you'll be happy. That said the lighter T3 with the 8 spd transmission makes it nearly as quick as the V10 bone stock (0-60 is 7.6 factory claim for the v10, 7.9 factory claim for the T3 V6 TDI)..having owned both I can say that those numbers are generally what it feels like (I won't argue the absolute numbers, but the two vehicles feel close in acceleration under 85MPH). The V10 lights it up when tuned, I've got a youtube vid of my V10 running a 6.0sec 0-60..this was the 04 version with no dpfs and an aggressive tune. Last thing to remember is the V10 is a 2 valve head so it struggles to breath at higher RPMs (where a tune shows its gains), the V6 TDI is a 4 valve head so much better breathing.
Wouldn't like to hijack but since you made such a detailed report would you say that tuning the v10 was worth it? Which tune you had and did you have any detrimental side-effects... I don't really want to drag-race my Reg just want a some top RPM power and more passing acceleration, so I don't think that the tune will affect the transmission...
 
Wouldn't like to hijack but since you made such a detailed report would you say that tuning the v10 was worth it? Which tune you had and did you have any detrimental side-effects... I don't really want to drag-race my Reg just want a some top RPM power and more passing acceleration, so I don't think that the tune will affect the transmission...
I used upsolute to tune mine but any of the common tuners can do it. It really wakes up the V10 especially between 2500-4000rpm. You actually will be shocked at how different it feels, it will feel like a gas motor - not a diesel.

Fuel economy improved too.

I'm sure in the long run the tune would not be good if you were pushing your vehicle all the time, but its fine if you dip into it now and then. The upsolute tune does NOT increase peak torque...the V10 doesn't need that!
 
Discussion starter · #28 ·
Diesel fuel is measured in CETANES no octanes...Octanes in typical diesel fuel range between 15-20, no comparison with gasoline...
Yes - sorry. Do know the difference but had a brain fart in typing that out.

Thanks for the insight, fellas. Did a lot of thinking and running of numbers, and decided both TDi cars were too much money for what I'm looking for. I want the treg to be a really long-term car, and I just couldn't justify the V10. Got a few quotes on warranties, and they were all pretty fair - all things considered. But, I would find it hard to justify the potential costs after that expires. The V6 TDi's are great, but I struggled to find a single one that was equipped the way I wanted. So, purchased an 06 V8, 4-zone, locking rear diff, winter package, nav, teak interior, black exterior, single owner, and dealer maintained for 12K with 95K miles. Paying cash for it frees up money to get a 930. Plus, if I'm really desperate and business is good, there is always the PES supercharger option for 8500 bucks. It's only 405 HP, but I'd be happy with a 0-60 time in the mid to low 6's at sea level. That's about all I need to feel safe getting around cars at altitude.

I fly out to NJ this weekend to pick it up, followed by a nice 1700 mile road trip back to denver. Perfect way to get to know my new friend :)
 
I used upsolute to tune mine but any of the common tuners can do it. It really wakes up the V10 especially between 2500-4000rpm. You actually will be shocked at how different it feels, it will feel like a gas motor - not a diesel. Fuel economy improved too. I'm sure in the long run the tune would not be good if you were pushing your vehicle all the time, but its fine if you dip into it now and then. The upsolute tune does NOT increase peak torque...the V10 doesn't need that!
OP congratulation for your new Touareg, winter package rocks, I think you'll find out pretty soon... Nick the upsolute site claims an increase in peak torque as well, maybe you got an earlier version of the flash they do....
 
Sweet ride. V8 has enough power to get you thru traffic with a tap of the gas pedal. Tiptronic probably makes the car drive with the torque of a V10, so you may never need to mod your treg if this is indeed true. Still training my V6 to behave in traffic like a V8 ;).

Just be sure that timing belt has been changed.
 
Discussion starter · #31 ·
Yup - just done a month ago with all the ancillary parts, too. Would have preferred to do it myself so I know it was done right, but I'll probably just do it again once one of the valve cover gaskets start leaking. That was another big reason I chose the V8 - bullet proof motor. No timing chains to worry about, parts for the VC and TB jobs are 600 for the whole thing, and you can knock that out in a day if you have the right tools.

The only car I see ever replacing the treg is the Macan. It sucks, but there just aren't any new cars out there with the same capability and build quality. I'm not usually a VW fan (mostly audi and porsche), but they nailed it with this car. Inside quality (if you get the button pealing fixed) is incredible - and I think better than the cayenne. The only thing I like in the cayenne is the roof and the leather covered dash. Otherwise, the rest of it just doesn't *feel* like it has the quality. Working the climate controls feels cheep, the seats aren't as comfortable (no tilting headrest sucks on long drives), and it feels much more spartan inside.

Plus, you frequent the cayenne forums and it's mostly just a rehash of the same issues. Not much of anything else there. Love that this forum exists and that this platform is so well supported with this forum. Plus, used parts are much easier to come by. I've seen entire Teak interiors on eBay in amazing condition for a grand (front seats, door cards, rear seats, etc).
 
No that's not what I was talking about. It's a diesel so you don't have to worry about cool time unless you're running it extremely hard. You need to keep the turbos under boost load on a regular basis. Firm throttle up to 3000 RPM. Keeps the turbo vanes clear and working. If you were too easy on the throttle, the turbo's will not have a chance to work the vanes and will eventually become sticky clogged and potentially fail.
I really don't understand what are you saying here..."Turbos under boost load" is what is mandatory to operate the vehicle in the real world anyway. If there is something to be careful about these turbos is to cool them down when you've worked them continuously hard. I don't see how less usage of their boosting power would be detrimental to their longevity....
 
What you need to do is run the right motor oil in any TDI, to prevent burnt motor oil vapor build up on the axles, so to speak of the vanes of a VNT nozzled turbo. This point is rather moot with the V10, it has electric motor activated vanes, the older models were either diaphragm pressure or diaphragm vacuum activated for the VNT portion of the turbo charger. With the PD came electric motor driven vanes controlled by the ECU.

The stuff he is referring to is old school pre pump dusse turbos, pre 2004 in the USA.

The turbo does not need to be kept under boost, boost and heavy loads is what soots up the vanes on the turbo, under continous conditions. The turbo vanes do need to be worked once in a while, full range. This can be done with a warmed up motor and getting into about 1/3 to 1/2 throttle getting on the freeway on ramp, once or twice a week if it's your daily driver, or go drive up a canyon on a two laned road in a spirited manner, on and off the throttle, briskly. Job is done, vanes have been worked through their full range and scraped the carbon build up off the ring that controls the vanes on your turbo.
 
A standard tune - no bolt ons or anything.

Seems unitronic makes a TDi chip resulting in 265 HP and 463 lbs of torque on 91 octane (which is all we have here). With the torque coming on much sooner than the V8, picturing those to graphs in my head and it seems like the TDi has a much great area under the curve. Combine that with the fact that it loses much less HP, and the fact it makes 160 lbs more of torque, and on paper it seems it would be much faster. If the V8 makes 264 HP and 260 lbs tq in Denver, and makes 236 HP at 8K ft elevation - it seems like it wouldn't be much of a fight once in the high country. But, this is all academic.

The V10 would be great - but I want to get back into an old 911, and also purchase an airplane. So - value is part of the equation. Motors are the souls of cars, and there is no denying the lust the V10 brings. But, my napkin math keeps pointing to the fact that a stock V10 and a chipped V6 TDi aren't too far off.
You run 91 octane in your chipped car getting 265 HP and 463 ft lbs of torque, all in the same sentence? You sure you're driving a diesel TDI?

Don't mix your fuels bud.

Whoops, little late to the party, my bad.
 
My 2007 V10 TDI with a Dyno-Comp ECU has been dyno tested at 372 HP and 635 ft/lbs of torque (calculated torque, e.g. https://wahiduddin.net/calc/cf.htm).

What's not to like about a diesel SUV with a twin-turbo V-10 engine and more torque than a 7.3L-powered Ford F-550?

 
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