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I asked a similar questions wax different box though some valid replies and an alternative aswell
Like you I too would like to knoww if they are worth the cost on both performance and economy
 

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These work by boosting the pressure to the fuel injectors on diesels.
Boosts the fuel pressure (which is already incredibly high) in the common rail. Can also increase the pressure in the turbo.

I had one fitted to a Mondeo TDCi many years ago.

Have to say, it made a massive difference in performance without any noteable decrease in economy. - there can be more black sooty smoke as the overboosting sometimes leaves unburnt fuel in the cylinders.


I think the general concensus is they they arepretty goodin the SHORT term. In the long term, they can lead to fuel pump, injector or turbo premature failure.

I did a lot of research on this at the time, and without a doubt, the generally agreed best way toget this performance upgradeis to get the ECU re-programmed with a map which is then tuned to the specific car. Generally costs about £400, but doesnt boost pressures which can lead to the aforementioned premature failure.

Aproffessionally applied custom map is definitely the safe way to go - the tuning boxes are pretty good, but not recommended if you intend to keep your car for a while!!!
--Oh and dont be conned into the idea that they programme to your specific model. If they re-programmed to your Specific Car, that would be another matter. every single engine/injector/fuel/turbo setup is different. a general map for the 1.5 Juke is hardly ideal for all 1.5 Jukes!

Andy
 

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I agree with Andytran, had one fitted to my Nav. Noticed the difference in power plus I had an increase in mpg. If you are only planning on keeping the car for 3 years (which I what I done) you should be fine, just take it off when it comes to service time
 

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Dont forget the companies do this themselves, they often offer engines in different states of tune and are often only remapped ecu.<?: prefix = o ns = "urn:schemas-microsoft-com:eek:ffice:eek:ffice" />
 

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Remember that these mods increase your insurance premiums as you now have a modified car
 

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I am not entirely convinced of the efficacy of piggy back tuning boxes/kits. I think the way to go is ECU remap. I do not believe there is yet a software developed for 1.6DiG-T, petrol version. DOES ANYONE KNOW WHERE THE ECU is located on the Juke?. I am asking this question as I have recently contacted a ECU remapping specialist who asked me to email him a photo of the Juke"s petrol version ECU.
 
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