Bought a chip box from eBay. From experience I bought the cheapest one available on the basis that they all pretty much do the same thing. I've had one on most diesel cars that I have had and results have varied from not bad to dramatic. This one is pretty good. Makes my tdv8 much more responsive and on a run added significantly to the mpg. This is what I got on a 50 mile motorway trip today, 60-70 mph (being careful ish). Coming back It went down to 35 doing 10-20 more.

Click image to enlarge

Really? What chip box did you use? Or is it verboten to ask such questions on the forum?

You may find a different figure if you brim the tank and calculate the true mileage. Not saying it won't be better than standard though.

I'm a bit of an old hand at these boxes and have had at least half a dozen. MPG usually reflects fairly well in the display to be fair. I've had results from 4-12mpg improvement on varying cars. They reckon a 60bhp increase on the tdv8 and it definitely feels like it.

I don't think the forum mind you mentioning products if you aren't affiliated. I'm not, and genuinely think you could buy any... The one I bought was dieselexpress, but have previously bought italianbox and probitz with the same effect.

To be fair, the tdv8 is already pretty gutsy. It transformed my td6 though which was 'agricultural' to say the least.

I realise these things have their haters (usually the remap crowd) but I'm very happy with this one

I did top up after this journey. 110 miles total was £20.10, so probably about 35mpg (as displayed at the end) My Previous RR's!
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2006 TD6 Vogue
2007 TDV8 Vogue
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2005 4.4 Vogue on LPG
2005 TD6 Vogue
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2000 2.5 DHSE
1999 4.6 HSE
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This one ?

http://www.ebay.co.uk/itm/DIESEL-TUNING-PE...ange+Rover .
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I think when you put a chip instead of remap the OBC don´t be accurate! It get confused! Ex-FULLFATTY now downgraded

L494 RRS P400e Dynamic Narvy Black

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6 | FF-RR 2007 TDV8 Vogue JAVA BLACK
5 | FF-RR 2003 TD6 Vogue Bonatti grey
4 | Ex-RR 2000 P38 automatic
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2 | Ex-RR 1993 200tdi
1 | Ex-RR 1991 turboD VM engine

Joe90 wrote:

This one ?

http://www.ebay.co.uk/itm/DIESEL-TUNING-PE...ange+Rover

the average mpg on your display is probably an accumulative figure for many weeks , whereas the figure you get after fitment of a box or a remap will be for that journey only after a reset ..you need to run for a few weeks to get a true figure..
i had a remap and for about a week i was getting better mpg but then after that it settled down to a true mpg and there was no difference... ... - .- -.




Y. O. L. O.
.

Stan,

I think is not only that!
When you make a remap in on the ECU, and ECU knows it has more power and give more or less fuel to the injectors, and gets the right values to the OBC.

Went you put a box, the ECU don´t know what is the correct value that goes to the fuel, so the OBC give always in a box better consumptions that really make.

I contacted a company that make remaps and they explained me something like that... i can´t be precise is what he explained me was really this, but is something like this.

When you remap you get the OBC accurate, on a box he get little confused. Ex-FULLFATTY now downgraded

L494 RRS P400e Dynamic Narvy Black

-------------------------------------- gone
6 | FF-RR 2007 TDV8 Vogue JAVA BLACK
5 | FF-RR 2003 TD6 Vogue Bonatti grey
4 | Ex-RR 2000 P38 automatic
3 | Ex-RR 1994 300tdi classic
2 | Ex-RR 1993 200tdi
1 | Ex-RR 1991 turboD VM engine

you could be correct..the only positive way to get a true mpg would be to do a tank to tank test..but note, my proper ecu remap didnt work but blanking of my egr valve got a few more mpg's [td6].. ... - .- -.




Y. O. L. O.
.

I'm no expert here but from research, generally those boxes are just a resistor that drops the fuel rail pressure sensor voltage signal to the ECU. Some are slightly more clever but that box doesn't look to be as it's only and inline connection with the fuel rail pressure sensor.
They work by reducing the voltage of the fuel rail pressure signal to the ECU so it thinks the fuel rail pressure is less than it should be. The ECU then ups the fuel rail pressure to get it to the correct level. So the ECU ends up thinking the fuel rail is at xxxxpsi when in fact it's at xxxxpsi + xxxpsi that the resistor has added on. The extra fuel pressure means more fuel is chucked in over a given injector opening which gives more HP.
Given that the ECU thinks it's putting in xx amount of fuel when in actual fact it's putting xx+10% for example, how's the OBC mpg reading going to be right? It thinks "woah all this performance and I've only put in xx fuel" so mpg rises.
I'm not saying it may not give better mpg but you can't rely on the OBC readings if you've fooled the ECU. To check properly you need to do a brim to brim test, before and after, with the same conditions.
If it works for you then that's fine but it's not the same as a proper remap where the likes of torque limiting at certain points to save potentially over straining the gearbox are taken into account or smoke production limiting etc etc. That's the reason why decent remaps cost more as they take all situations into account and will stand by their work if something goes wrong. The downside is, as mentioned remaps are more expensive, you have to find a decent tuner and it may not be easily reversible where as a box is just unpluggable.

I'm not condemning anything, I just wanted to give the full picture.

That's good information Weejock and inline with what I've been told in the past too.

To the OP, please do some brim to brim tests and report back for us eh? Discovery 4 HSE
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Weejock!

It was that the explanation i eared, but it was to much to i remember!

Awesome explanation!


Stan

I read some posts in the past about blocking the EGR valve and get more MPG!
Is that true? Do you recommend to buy one KiT? Ex-FULLFATTY now downgraded

L494 RRS P400e Dynamic Narvy Black

-------------------------------------- gone
6 | FF-RR 2007 TDV8 Vogue JAVA BLACK
5 | FF-RR 2003 TD6 Vogue Bonatti grey
4 | Ex-RR 2000 P38 automatic
3 | Ex-RR 1994 300tdi classic
2 | Ex-RR 1993 200tdi
1 | Ex-RR 1991 turboD VM engine

i certainly do recommend the egr blanking kit...they are only about £30 on ebay and in my case i did get a few extra mpg's.. ... - .- -.




Y. O. L. O.
.

[]

Nice to ear that!

And will not commit anything to install it? Don´t interferes with anything, right?


thanks stan! Ex-FULLFATTY now downgraded

L494 RRS P400e Dynamic Narvy Black

-------------------------------------- gone
6 | FF-RR 2007 TDV8 Vogue JAVA BLACK
5 | FF-RR 2003 TD6 Vogue Bonatti grey
4 | Ex-RR 2000 P38 automatic
3 | Ex-RR 1994 300tdi classic
2 | Ex-RR 1993 200tdi
1 | Ex-RR 1991 turboD VM engine