« Reply #10 on: 11 September 2013, 18:33 »
TDI-tuning.co.uk are marketing a plug in tuning box that claims 239PS and 495Nm torque. Can't say i've experienced it myself, but my dad had one of their boxes on his MK5 GT 170TDI DSG that was rated to uprate power to 200PS. It upped his power noticeably as well as his fuel economy. His MK5 with that box was more economical than his current MK7 GTD DSG.
I looked on the website and watched the video. I have to say I'm mighty confused about the to good to be true products they're selling!
I mean, if attaching a little box that costs a few hundred quid can give you such a performance boost as well as an extra 4-6mpg, why aren't manufacturers using these things, or tuning the engine like this as standard? It just seems to ridiculous to be real 
Diesel tuning is quite simple in principal as it doesn't run a throttle like a petrol engine - the more fuel you throw in the more power it produces.
So in simple terms they just wind up the fuelling until it starts to smoke then wind the fuelling back a bit until it stops smoking. Voila - lots of extra power. That is in very basic terms how a tuning box works.
Digital ones have a few extra parameters to play with which will protect the engine internals a little bit from the extra heat and stresses produced and keep it smooth.
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‘23 8R, ‘20 8CS, ‘19 135iX, ‘19 TCR, ‘17 Ed40, ‘17 GTD, ‘15 7R, ‘13 GTI PP, ‘11 GTI, ‘09 GTI, ‘98 Ibiza Cupra, ‘05 GTI, ‘06 Polo GTI, ‘04 GT TDI, ‘05 Fabia vRS, ‘02 GTI T, ‘03 Ibiza TDI 130, ‘01 Leon 180, ‘89 mk2 16v, ‘99 Ibiza TDI, ‘96 VR6, ‘98 Ibiza TDI, ‘92 VR6, ‘88 mk2 8v, ‘92 Polo G40, ‘91 mk2 8v, ‘89 mk2 8v, 205 GTI 1.9, ‘83 mk1 GTI, ‘80 Scirocco GTI, plus some others I’ve forgotten
