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CRJ



Member Since: 12 Mar 2011
Location: Sealand - Denmark
Posts: 253

Denmark 1991 Defender 90 200 Tdi ST Alpine White
Black box???



Morning. I finally have some time to get to know my new Td5. I am a bit in doubt about the function of this Black box. It is connected to the Yellow wires from the ecu and to a relay of a kind. Thinking it is either a tuning box or a box that interfer with the boost Reading so that the Ecu never get a Reading above Max ? In that case the car is probably remapped? I never had a Td5 before.... but from 60 kmh in fourth or 80 kmh in 5 it Will outrun the Td4 I had very easy🤔 88 Ser. 3 1980 -sold
Puma 130 - 08- sold
90 200tdi 1991 - sold
88 Ser. 3 1977 200 TDI
110 CC 2003
Post #872680 13th Dec 2020 6:29am
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mwestcrew



Member Since: 09 Dec 2019
Location: South Warwickshire
Posts: 262

United Kingdom 2011 Defender 130 Puma 2.4 HCPU Baltic Blue
I’d say that was more likely to be a speed limiter. Has your vehicle got any history of being owned by a utility company or similar? 2011 130 Utility Body
2005 110 Van
Post #872700 13th Dec 2020 11:11am
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CRJ



Member Since: 12 Mar 2011
Location: Sealand - Denmark
Posts: 253

Denmark 1991 Defender 90 200 Tdi ST Alpine White
Not that I know of? I have not been above 135 kmh - but I am sure it Will go further... but not before clutch and flywheel is changed.... 88 Ser. 3 1980 -sold
Puma 130 - 08- sold
90 200tdi 1991 - sold
88 Ser. 3 1977 200 TDI
110 CC 2003
Post #872704 13th Dec 2020 11:29am
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TJ101



Member Since: 30 May 2007
Location: Taunton Somerset
Posts: 3750

Isle Of Man 2015 Defender 110 Puma 2.2 XS CSW Montalcino Red
99% a tuning box of unknown origin Ie a early PSI Tuning box maybe

A crude was of tricking the injection timing and getting more power
Were all the rage,a few years ago,, ditch it and get a proper map done if you need a tune California F1, 75th 110 "Kermit", 50th Ann V8, 90 V8 Hybrid, 55 Series 1

Main Brian James Trailer Dealer for South West UK
Post #872776 13th Dec 2020 7:07pm
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CRJ



Member Since: 12 Mar 2011
Location: Sealand - Denmark
Posts: 253

Denmark 1991 Defender 90 200 Tdi ST Alpine White
I Think you are right - it pulls Like a train when you floor it......and deliver a smoke screen as well... 88 Ser. 3 1980 -sold
Puma 130 - 08- sold
90 200tdi 1991 - sold
88 Ser. 3 1977 200 TDI
110 CC 2003
Post #872786 13th Dec 2020 7:41pm
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roel



Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2039

Netherlands 2003 Defender 90 Td5 PU Caledonian Blue
It could be a PSI or like tunung box.

A proper tune might be better but these are not that bad either. I have one and I like it.
Simply said it will keep the injector open a little longer to get more fuel so more power. However simply seen does a tune the same. A PSI power box does not change sensor signals so the safety features from the ecu still work.

The only thing I didn't like that it starts working at around 1300 rpm and that happens to be in the rpm range that I use in town.
I have it now installed behind a voltage sensing relay and it only works when I have about full throttle.

So don't ditch it directly. Whistle

There are jumpers inside where you can adjust the power with. Roel

1984 90 2.5 na Diesel - RR V8 (1994-2001)
1997 Camel Trophy Discovery 300TDI (2001-2009)
2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts.
2003 90 Td5 (2009-now)
Post #872787 13th Dec 2020 7:44pm
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CRJ



Member Since: 12 Mar 2011
Location: Sealand - Denmark
Posts: 253

Denmark 1991 Defender 90 200 Tdi ST Alpine White
Thanks... I Will take a look at it... As long as i dont floor it - there is no smoke.... but full throttle is Black smoke and lots of it😅 88 Ser. 3 1980 -sold
Puma 130 - 08- sold
90 200tdi 1991 - sold
88 Ser. 3 1977 200 TDI
110 CC 2003
Post #872789 13th Dec 2020 8:25pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8051

 2011 Defender 110 Puma 2.4 USW Stornoway Grey
The psi box i ran on a vw looked very similar, except it was blue! Rectangular, rounded corners, fixings the same. My guess is turning box Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #872799 13th Dec 2020 10:00pm
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roel



Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2039

Netherlands 2003 Defender 90 Td5 PU Caledonian Blue
Open it and show us the inside. Very Happy Roel

1984 90 2.5 na Diesel - RR V8 (1994-2001)
1997 Camel Trophy Discovery 300TDI (2001-2009)
2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts.
2003 90 Td5 (2009-now)
Post #872908 14th Dec 2020 5:44pm
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kzycnn



Member Since: 24 Apr 2009
Location: Northumberland
Posts: 277

United Kingdom 2003 Defender 110 Td5 XS CSW Oslo Blue
I would concur - tuning box. I would also concur with TJ101 - ditch it and get a proper tune. When I bought my TD5 it had something similar fitted. It would get to a point in the throttle movement, hesitate as if briefly going into limp mode and then accelerate like Censored It was scary! My son loved it Rolling with laughter . Ditched it for a few beer tokens and had a proper BAS tune installed - made a huge difference!

Tony
Post #873216 16th Dec 2020 9:33am
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roel



Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2039

Netherlands 2003 Defender 90 Td5 PU Caledonian Blue
This is funny the opinion here is all tuning boxes are ****. However there is like in "proper" tunes a lot off difference.
The only way you get more power out off a td5 is to open the injectors longer. If you don't do that you won't get more power.
To make most off the extra diesel you might need to do more like increasing the turbo pressure and probably an intercooler etc. But that is not included in a tune either.

Yes I did some research and I think that the psi power boxes are probably the best in the market and in my eyes the only right way to do it for a tuning box. Just keeping the injectors open longer not changing sensor values like some other boxes do.

I don't have any hesitations or going into limp mode. So I suspect kzycnn had a very cheap version.

In Mr Zulu mode I got some black smoke but by removing the restrictions in the airinlet before the airfilter and increasing the max turbo pressure to 1.3 bar it is within limits for the Dutch MOT. Normally I switch it off before the MOT only the last time I forgot. Laughing Roel

1984 90 2.5 na Diesel - RR V8 (1994-2001)
1997 Camel Trophy Discovery 300TDI (2001-2009)
2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts.
2003 90 Td5 (2009-now)
Post #873236 16th Dec 2020 10:29am
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kzycnn



Member Since: 24 Apr 2009
Location: Northumberland
Posts: 277

United Kingdom 2003 Defender 110 Td5 XS CSW Oslo Blue
My tuning box was Austrian - can't remember the make, off hand - it was about 15 years ago! The BAS tune made the whole thing much more drivable which, really, with a Defender is what it's all about.

Tony (kzycnn)
Post #873239 16th Dec 2020 10:55am
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CRJ



Member Since: 12 Mar 2011
Location: Sealand - Denmark
Posts: 253

Denmark 1991 Defender 90 200 Tdi ST Alpine White
roel wrote:
Open it and show us the inside. Very Happy

Here you go... I am a bit 🤪 about it??

 88 Ser. 3 1980 -sold
Puma 130 - 08- sold
90 200tdi 1991 - sold
88 Ser. 3 1977 200 TDI
110 CC 2003
Post #873849 20th Dec 2020 1:36pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17443

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
Hmm, a box of potting compound! That is keeping its secrets well.
Post #873892 20th Dec 2020 6:36pm
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roel



Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2039

Netherlands 2003 Defender 90 Td5 PU Caledonian Blue
On the right lower are some jumpers like the psi powerbox but AFAIK mine looks different.
On the lower side is a sticker with the serial number is there a brand name mentioned? Roel

1984 90 2.5 na Diesel - RR V8 (1994-2001)
1997 Camel Trophy Discovery 300TDI (2001-2009)
2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts.
2003 90 Td5 (2009-now)
Post #874024 21st Dec 2020 6:40pm
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