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Thread: Dual Tyre Pressure Equalisation System

  1. #1

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    VW LT 2.8TDi Self-Build Camperbus

    Dual Tyre Pressure Equalisation System



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    I like Tyre Monitoring Systems and bought a 6-wheel system for my LT Dually. I had problems with it as the extra weight of the sensors on the Valve extenders tended to cause the elbow extender to loosen and so loose pressure. The extender actually has loosened a couple of times without the sensors so was a hassle.

    I searched around the internet for options and came across the Crossfire system and really liked the sound of the features.
    This is the manufacturers web page on the problem - Crossfire - Dual Dynamics

    You need to choose a kit that matches the Pressure you want to run at - they are no adjustable. When I first looked at these I was not sure what pressure I would be running the rear tyres at as didn't know my final running weight. Once I had near enough completed the conversion, loaded up with the most I planed to carry (which is quite a bit in the garage sometimes), took to the weighbridge and from that weight, further research and a handy and timely tyre pressure thread on this forum, decided 65PSI would be the pressure of choice for my rig.

    So looked for a 65PSI Crossfire kit and as luck would have it found a nearly-new pair of 65PSI units on Ebay.com (US Site). The units with postage and import duties came to around £60 which is very good.

    Installation was a bit trickier then the instructions and youtube videos would have you believe though (at least on my vehicle). In order to properly secure the hose on the inner wheel I had the remove the outer wheel to allow room for the 13mm spanner to tighten the hose nut. The sequence of fitting like this means you lose pressure while the Crossfire is partly disassembled (but not a big problem and actually means you get to check its operation as part of the install )
    Overall, including jacking up the van each side, removing a pair of wheels, installing the kit and refitting wheels, retorquing, dropping jack and packing away took maybe 60 minutes.

    Once Installed this is what it looks like on a LT/Sprinter Dual Wheel
    Crossfire Installation by David, on Flickr

    When at the pre-set Pressure, the display is Yellow and there are two black marks that line up with the marks on the surround
    Crossfire Installation by David, on Flickr

    This shows the Yellow section coming into view as I am inflating the tyres up to pressure
    Crossfire Installation by David, on Flickr

    When the pressure is 10PSI below the pre-set, the display is black. This shows mostly black as I am at around 55PSI
    Crossfire Installation by David, on Flickr

    Not tried this feature yet, but if the pressure is 10PSI OVER the preset the display shows red. This is quite possible to happen due to the way tyres warm up and it is more of a informational display rather then a problem one.


    What I really like about this system is not just it tells you at a glance the pressure is at the setting you want when you do your walkround before driving off, but it keeps the tyre pressures matched between inner and outer tyres, plus it gives you just one fill valve for both tyres which is dead handy I think.
    (to pre-answer one common question on this system, the unit is monitoring both tyres and if one tyre suffers rapid deflation, the valve shuts off. For a slow leak, the valves shut off when the pressure drops 10PSI below the preset (so 55PSI for me))

    One thing which I am wondering a little about is if the extra off-set weight on the wheel will introduce any vibration? I suspect however it won't be noticable.

    I might fit the TPMS sensors from the unit I already have to the central valves as I do have the system anyway and so could use the 2nd set of rear sensors on my little trailer.
    Camperbus Blog and Website - www.wildebus.com
    Electrical Bits - stores.ebay.co.uk/Camper-Van-Kit

  2. #2

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    Why would it matter if the pressures in the paired tyres were a little different? On cambered roads (that's all of them) and when cornering (that's every journey), the loads are not the same.
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  3. #3

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    Have a read of the info on the website I linked to learn why.

    There will be a reason why a company has developed this kind of equipment and put a lot more research and knowledge into it than I have. So I am inclined to believe the benefits (especially as on two occasions I have had one tyre at way lower pressure than the other due to loose extenders and that was not good - and you cannot tell on a dually if there is this discrepancy (I certainly didn't notice until I got out the van and saw the tyre didn't look right each time)
    Camperbus Blog and Website - www.wildebus.com
    Electrical Bits - stores.ebay.co.uk/Camper-Van-Kit

  4. #4
    Byronic Guest
    I don't suppose you'll be able to sense imbalance on the rear, but you'd definitely
    need a rebalance if a gauge such as that needs to be fitted to the front.
    As the pipe goes through the rim cutouts it could abrade on the metal edge
    with wheel movement, but the lines look like s/s braided so probably OK long
    term.

  5. #5

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    Quote Originally Posted by Byronic View Post
    I don't suppose you'll be able to sense imbalance on the rear, but you'd definitely
    need a rebalance if a gauge such as that needs to be fitted to the front.
    As the pipe goes through the rim cutouts it could abrade on the metal edge
    with wheel movement, but the lines look like s/s braided so probably OK long
    term.
    The kits come with apieces of rubber hose (looks like fuel pipe to me) that goes over the hose for the inner wheels to address that rubbing and potential abrasion
    The elbow for the outer wheel is touching the wheel and I might put a bit of rubber on that to isolate it though.

    The kit looks a bit old fashioned and judging from the intro video, has been around for a while, but I think it is one of those "if it ain't broke, don't fix it" type of products and feels VERY robust and high quality (hope so anyway!)
    Camperbus Blog and Website - www.wildebus.com
    Electrical Bits - stores.ebay.co.uk/Camper-Van-Kit
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  6. #6

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    Ok if no leak over from one tyre to other,vibes may be a prob at high speed but most dont go to fast im sure.
    I would prefair in cab monitor to be honest.
    Only dirty people wash

  7. #7

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    Quote Originally Posted by trevskoda View Post
    Ok if no leak over from one tyre to other,vibes may be a prob at high speed but most dont go to fast im sure.
    I would prefair in cab monitor to be honest.
    Trev, did you read the info on the website? It links the two tyres to equalise them dynamically so you could say there is a "leak" from one to other but in the way that is good.
    I will probably fit the TMPS to the central valve as well. I could add some balance weights opposite the gauge possibly for some approximate balance .
    Camperbus Blog and Website - www.wildebus.com
    Electrical Bits - stores.ebay.co.uk/Camper-Van-Kit
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  8. #8

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    Thought this kit came out a while ago .... Read a posting on a sprinter forum yesterday from someone who said he had been running a crossfire system for 20 years! (A post 5 years earlier said 15 years so it sounds like he has had just the one kit so bodes well for product longevity).
    Camperbus Blog and Website - www.wildebus.com
    Electrical Bits - stores.ebay.co.uk/Camper-Van-Kit

  9. #9

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    Thatís a fancy bit of kit

  10. #10

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    Quote Originally Posted by wildebus View Post
    Trev, did you read the info on the website? It links the two tyres to equalise them dynamically so you could say there is a "leak" from one to other but in the way that is good.
    I will probably fit the TMPS to the central valve as well. I could add some balance weights opposite the gauge possibly for some approximate balance .
    If one got a hole then would both not go down.
    Only dirty people wash

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