anyone used one of these

https://www.ebay.co.uk/itm/Chip-Tuning-Box...Sw9nJcnfFT

any good do you think

Keep well away from these as they lie to the ECU & mainly all they do is overfuel,if you want it re-mapping I recommend Alive tuning or BellAutos that do them on a rolling road so you know the bhp your getting & these guys know the limits without damaging engine,gearbox. Andy.
21 Ford Ranger
Gone but not forgotten
Focus RS Red Edition
2015 RRS AB Fuji.
2014 RRS SC Santorini
2016 VW Amarok
2014 RRS AB Fuji
2012 RRS Red Edition Fuji
2015 Nissan Navara
2012 RRS SE Santorini
2008 RRS White
2007 RRS Santorino

@Tyrefitter is spot on, make sure you read past the first paragraph

http://www.endtuning.com/dieseltuningboxes/

When you own something as expensive as a RRS if you want a power increase I would spend the extra and get a decent remap. I've had mine done by DMS who are one of the best in the business and the car feels much better for it and is noticeably quicker.

+1 I agree
Get a proper remap.
I have had a remap on a Diesel from Pete Bell at BAS https://bellautoservices.co.uk/
Also had a remap on a Petrol from JE Engineering https://jemotorworks.co.uk/
Both of these remaps made a fantastic difference.  In Spain - 2018 F Pace - Frightened away from the Sports due to crank failures
Gone - A couple of RRS, A couple of Disco's. However thinking of another Sport.

Last edited by SRE on Sun May 19 2019 9:22am. Edited 2 times in total

My sdv6 was remapped by Alive 4 years ago now. Better using a specialist map than a box.

father jack do you get better mpg would you say as I think its quick enough as it is it has the 306 engine

Had a customer reporting 37mpg in his D4 after a remap

If it's possible to get 31 mpg out of a 715 BHP twin turbocharged V12 then 37 mpg is not that remarkable:

Click image to enlarge

I've not seen much mpg change and the only time I ever got mid 30mpg was on the A9 which has miles of average speed cameras. Typically 20 to 22mpg if doing a lot of town or 27 to 29 motorway. The performance is excellent though and no roundabout hesitation.

MPG depends on driving style journey length traffic how hilly what load you have on board etc. In a car this size 1 or 2mpg is nothing to be too excited about.