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Thread: DTUK CRD-T box. Wow!

  1. #1
    Regular Member parapaul's Avatar
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    Thumbs up DTUK CRD-T box. Wow!

    Let me start by saying Iíve owned and driven both a remapped and boxed diesel before, and Iím fully aware of all the pros and cons for each option. However, in my experience, the box felt faster than the remap, despite having almost identical figures on paper, and I can only assume thatís to do with the way the power is delivered.

    The other factor thatís swayed me towards a box again, is the new MOT regulations. Nobodyís quite sure yet what exactly they will and wonít be able to see, do or check, but there is a specific reference to alterations to the ECU Ė and I thought a box that could be physically removed was a better option.

    The CRD-T box has 4 pre-loaded maps, each with different manipulations of fuelling and boost levels, and then each of these maps is adjustable by +/- 10,20 or 30% to fine tune it to suit each individual car.

    Map 1

    This is the Ďbasicí CRD-T map. First impressions are VERY good. The usual sluggish response before the turbo spools up has completely disappeared; the car feels responsive and lively with even the lightest squeeze of the throttle. The first mile of my drive to work is uphill, over speed humps, and itís always felt like Iíve had to work the cold engine quite hard with the constant speeding up and slowing down. This morning, the car sailed over that section, never having to raise the revs, as there was so much more torque, even at 1000rpm.

    And then I got onto the dual carriageway and put my foot down that instant power delivery didnít disappoint, and it pulled strongly right through to 4k rpm, when I looked at the speedo and realised I was in license losing territory

    Contrary to what I thought, and something that Iím very happy about, it doesnít seem to have affected the accuracy of the OBC at all. I know that a round trip to work would always return 35mpg previously, and after resetting the trip computer before leaving home, it showed 37.1mpg arriving back at home 40 miles later Ė even after driving a bit harder than I normally would, just enjoying the extra power available. If that continues, thatís going to be extra miles out of every tank Ė the box will pay for itself in no time!

    Map 2

    This map has the same boost levels as Map 1, but slightly increased fuelling. Despite this, it doesnít feel quite as responsive under light throttle, or quite as smooth as Map 1. The difference is noticeable once you put your foot down though, the power comes in even harder OBC showed 39.6mpg for the same journey, which is an outstanding increase in economy given the power hike, but I think for my driving style, and the majority of the journeys I do, Map 1 is better suited. This would better suit someone who drives hard a lot of the time, which to be fair, I donít.


    Map 3

    Same fuelling as Map 1 this time, but with increased boost. Instantly felt much better than Map 2, the initial responsiveness that Iíd enjoyed from Map 1 was back, and the extra boost gives a lovely smooth delivery of power right through to the redline. Typically, when Iím trying to do a comparative test, my trip to work with this map was in very heavy traffic Iíll see what the OBC says when I get home, but this is almost definitely the one Iím going to stick with. It suits my driving style and the car perfectly.

    Map 4

    This map has no extra boost at all Ė itís just increased fuelling, the same as (presumably) the CRD2 or Red/Green boxes. TBH Iím not going to try this one, it seems counterintuitive to run a 1-channel map on a box that can manage 2. Iím sure thereís a reason for having it, but with 3 other choices, I donít feel like Iím missing out

    Now Iíve decided Iím sticking with Map 3, I need to adjust the power to get the most out of the box. +10% tomorrow, then +20% if that doesnít cause any problems. Then I need to think about telling the insurersÖ Gulp!

    All in all, a great big for DTUK, Andrew himself, and the CRD-T box.

  2. #2
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    did you pick this box up new?? after reading your review i want to swap my green box for a CRD T box! do you get any black smoke puff out on hard acceleration??

  3. #3
    Regular Member Innes's Avatar
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    I don't see how a box increases the boost? its plugged into the ECU to increase fuel pressure. Boost is a by-product of the exhaust gasses spinning up the turbo which requires fuel!

  4. #4
    Regular Member stevie16v's Avatar
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    Vehicle : Vectra

    Trim : SRI XP1



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    Quote Originally Posted by Innes View Post
    I don't see how a box increases the boost? its plugged into the ECU to increase fuel pressure. Boost is a by-product of the exhaust gasses spinning up the turbo which requires fuel!
    This box also connects to the turbo boost pressure sensor

  5. #5
    Regular Member CH-VECTRA-ELITE's Avatar
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    Vehicle : Vectra Estate

    Trim : Elite

    Engine : CDTI 150 (Z19 DTH)

    Year : 2006

    Mileage : 140000

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    Just looking on their website, does anyone know the difference between 1.9CDTi 150 PS and the stage 2???? can only get the CRD-T for the stage 2.

  6. #6
    Regular Member Hideous's Avatar
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    Vehicle : Insignia

    Trim : SRi Nav

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    Year : 2012

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    i'd rather have one of these instead of any remap.
    the OC could be more accurate than it is when using conventional TBs because the boost pressure is altered to suit the fueling with these top TBs < not sure about that though :/
    trip computers are usually very optimistic with the ordinary TB.
    Last edited by Hideous; 12th October 2011 at 18:13.

  7. #7
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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

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    Quote Originally Posted by Hideous View Post
    i'd rather have one of these instead of any remap.
    the OC could be more accurate than it is when using conventional TBs because the boost pressure is altered to suit the fueling with these top TBs.
    A tuning box tricks the onboard computer as that is how it fuels the car. A remaps reads all information coming from the sensors, in the ECU and isn't in accurate as it would be with a box.

  8. #8
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    Trim : Sri nav

    Engine : Z19dth

    Year : 2006

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    Quote Originally Posted by stevie16v View Post
    This box also connects to the turbo boost pressure sensor

    So the box reads the pressure, yes? How could boost be raised by the box?

  9. #9
    Regular Member FatboySteve's Avatar
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    If the wastegate is electronically controlled (the bit which limits boost by letting gasses bypass the turbo) then it should be pretty easy by the box intercepting the signal from the pressure sensor, and telling it it's lower than it is. Same as a bleed valve, but electronic

  10. #10
    Regular Member R2XPT's Avatar
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    Had all 3 dtuk boxes, now mapped and would never go back!!

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