MK7 GTD - Real Life MPG

[mcmaddy]

which supermarket fuel were you using kyle? I'm not overly impressed with shell but then again if they've changed to winter diesel then that could be a factor.

[monkeyhanger]

Just thought I'd add my experiences. I've been getting high 40s low 50s on a regular basis with supermarket fuel. Decided to give shell a try (non v power) and ever since I've not seen over 43. Going to give it another tank full of shell but not impressed so far.

Really surprised by standard Shell giving you poor mpg - Esso, Morissons (which I won't touch) and Sainsburys are all cheap near me. My previous TDIs have always preferred Shell to anything else. If I don't get any appreciable power gains on standard diesel then i'll be keeping my TDI-tuning.co.uk box because right now (still running out the Shell V-power), setting 4 of 7 just about outdoes the Scirocco (traction permitting on the sh!tty Bridgestones) - exactly what I was expecting for the GTD before the big miles roll on.

[monkeyhanger]

Mind just did its first active regen (that I've noticed) when I got home.  Ran for maybe 10 mins and smelt very hot - thought I'd better keep an eye on it to make sure it didn't catch fire .  I'm wondering whether this is something specific to the design of modern VAG diesel PF's, or do other current makes do a similar thing?

If you've just started a regen and the car hasn't got that hot when you finish your journey then you'll get no fan. If it's maxed out on temp then the fan will need to kick in. You've probably had a few regens that have happened passively and finished before you finished your journey then cooled down enough for the fan not to kick in. You'll notice them by higher idling rpm (1000 instead of 800) if you're stopped at lights/roundabout etc and your gear change prompts encouraging a lower than normal gear e.g. holding onto 3rd to 30mph, holding onto 4th to 38mph.

[Skinnee D]

Mind just did its first active regen (that I've noticed) when I got home.  Ran for maybe 10 mins and smelt very hot - thought I'd better keep an eye on it to make sure it didn't catch fire .  I'm wondering whether this is something specific to the design of modern VAG diesel PF's, or do other current makes do a similar thing?

If you've just started a regen and the car hasn't got that hot when you finish your journey then you'll get no fan. If it's maxed out on temp then the fan will need to kick in. You've probably had a few regens that have happened passively and finished before you finished your journey then cooled down enough for the fan not to kick in. You'll notice them by higher idling rpm (1000 instead of 800) if you're stopped at lights/roundabout etc and your gear change prompts encouraging a lower than normal gear e.g. holding onto 3rd to 30mph, holding onto 4th to 38mph.

Thanks MH - that fits.  Also the auto stop has been blocked a few times, presumably for the same reason.  Annoying that the manual is completely silent on all this

[monkeyhanger]

SkineeD: Yep, auto stop disabled by the car definitely means a regen is happening that the car doesn't want to disrupt.

[KyleB]

Just thought I'd add my experiences. I've been getting high 40s low 50s on a regular basis with supermarket fuel. Decided to give shell a try (non v power) and ever since I've not seen over 43. Going to give it another tank full of shell but not impressed so far.

Really surprised by standard Shell giving you poor mpg - Esso, Morissons (which I won't touch) and Sainsburys are all cheap near me. My previous TDIs have always preferred Shell to anything else. If I don't get any appreciable power gains on standard diesel then i'll be keeping my TDI-tuning.co.uk box because right now (still running out the Shell V-power), setting 4 of 7 just about outdoes the Scirocco (traction permitting on the sh!tty Bridgestones) - exactly what I was expecting for the GTD before the big miles roll on.

It was actually Morrisons and ASDA that are giving me the better figures. As I said I'll give Shell another tank or so and see if it improves.

[p3asa]

A wee light on the dash when the regen is on would be advantageous for me.
My commute is mostly b roads and dual carriageway to work and my first stop is 100 yards from work.
So on the way back home I rarely get to stop at all apart from when I pull up on my drive and a few times its been doing a regen. If it had a light on the dash I would have drove another couple of miles until the regen was finished rather than have the fans go hell for leather for a full 15 minutes while parked on my drive and then have to do the whole thing over again the next time I get into the car!!

[Sootchucker]

This is currently being discussed over at the Motor Talk.de forums, to see if a warning can be shown on the MFD vis VCDS.

I'll keep an eye on it and if possible I'll let you all know (not sure currently though if it is even possible) ?

[broomthundle]

Sorry to appear thick - but what's a Regen ?

[monkeyhanger]

Sorry to appear thick - but what's a Regen ?

The car's way of burning off the soot that the DPF collects, before the DPF fills up and clogs. Active and passive regens. Passive if your driving style and journey allows the exhaust system to get up to temp on it's own, active if the car needs to artificially create the high exhaust temp by sending some fuel in there to combust (makes the car a bit thirsty on an active regen).