DMS and 2009 Q7 4.2 TDi

[Skittles001]

Hi all. I have a 2009 Q7 4.2 TDi. It's pretty quick but after a few years of use I'm thinking if getting DMS to upgrade it via a remap. The claimed gains are huge: +65 Bhp/+95 lb/ft.

They offer a mobile service ie just come to your place and upload it.

Does anyone have any views on:

1. DMS (generally and Q7 specific)?
2. Whether the Q7 4.2 TDi takes well to being remapped?

Thanks all

[Dr G]

I've no personal experience with DMS.

4.2s do like a map very much; I haven't driven a Q7 4.2 tuned but have an A8 and that felt almost RS6 quick.

Please tell me what brands of fuel/tyres you buy so that I may invest in shares

[LordHaveMurci]

I used DMS when I had my E46 330D, they came out to me & uploaded the new map. The wrong map.

I then had to drive approx 1hr each way to meet up to get the corrct map uploaded.

It made a big difference in performance, economy improved fractionally.

A few thousand miles later at 30k miles it ate it's turbo, no idea if it was related or not.

[Adrian E]

LordHaveMurci said:

A few thousand miles later at 30k miles it ate it's turbo, no idea if it was related or not.

Probably - suggests they've either wound the boost up to the point the turbo is over-speeding or disabled something in the ECU that should act as a safety limit on the map, basically amounting to the same thing.

[LordHaveMurci]

Adrian E said:

LordHaveMurci said:

A few thousand miles later at 30k miles it ate it's turbo, no idea if it was related or not.

Probably - suggests they've either wound the boost up to the point the turbo is over-speeding or disabled something in the ECU that should act as a safety limit on the map, basically amounting to the same thing.

Sold it shortly after the new turbo was fitted so no idea if it happened again.

[Skittles001]

Cheers guys. Bit worrying about the chewing through a turbo :-0

[Adrian E]

The newer the car, especially diesel, the bigger the risk when modifying the ecu. Lots to go wrong and loads of interrelated systems that can be wrecked by careless modding

[Dr G]

Like I say, I've no personal experience with the tuner in question but their adverts do offer larger gains from software only than the brand specific tuners do.

[bridgland]

So are you planning on going ahead with this, or are you going for something a little more conservative? I have a 4.2TDI too and would like to see what benefits you get wih power/torque and potential economy improvements.