KKOG Forum

Allan
I agree with your thoughts that mirror my experience except that my system has/does indicate loss of pressure while driving and starts beeping if below the set point.  Recently one of my tyres was a bit low and on a cold  morning it would be below the set point and would beep until the tyre warmed up.  As yours does, it will hold the last pressure when the sensor is out of range but once the sensor is back in range it seems to pick it up and display the correct pressure.  A bit disconcerting but once you know it you ignore the reading.  I have had no problem with the TPMS reading changes in pressure if I drop the tyre pressure or increase it.  My system does change pressure reading as I drive and the tyres heat up even though it is constantly powered.  I recently fitted airbags to the rear of the MUX and have noticed that the TPMS now reads the front tyres hotter (higher pressure) and the rear cooler (lower pressure) as the load is more evenly distributed so I am comfortable that the system is giving me real time pressures.
Russ

I also bought the safe T Dave tpms last June. Been delighted so far. Paid 400 I think at Brisbane caravan and camping show for the 6 tyres. I love the security of knowing tyres are ok particularly when travelling on rough roads.
Regards
Barry

Russ, I believe the way the sensors work is that they send a signal only when they detect a change in pressure in the tyre above their threshold. So when you start up and power up the receiver it is not getting any signal until you run for a little while and the heating of the tyre causes a slight rise in pressure triggering a signal. I do not know if the receiver always locks on to the first few signals or whether it needs a few to register. When you unscrew the sensor the pressure drops to zero and triggers a signal, when you screw it back on it sends another signal and so it is locked on - usually.
Now for the bad news - having wired it in to 12 V you have a signal constantly displayed - at least that is what it appears, unfortunately this is not necessarily the case. What it does is retain the last value that it had which could have been from days before so although you feel comfortable that you have a lock on the pressure this is misleading.
To give you two instances of this:
1. We did the Simpson crossing a few years back and although we left the Karavan at Birdsville we still appeared to be reading the van tyre pressure all the way across, the reading never changed and it was solid.
2. Last year we shredded a tyre on the van at Normanton and when Police stopped us to tell us about the flat tyre I glanced at the readout which was solid and told me we had 45 psi in the tyre. Obviously the receiver missed the reduced pressure signal.

These things are a great aid but they are not foolproof. Personally I think powering them up each time is a safer way to ensure that you are getting the correct reading.

Cheers

Allan

We use the Safety Dave system and it is excellent. We did need a free repeater unit in the back of the Ute canopy to get stable results from the LHS of the KK. Only issue that we have had was with flexible valve stems on the KK which was eliminated by short lengths of inflexible hose. The T valve stems sound a good idea however we have found that we don’t use the locking grub screws on the sensors and have not had any come loose. They are then no different to a valve cap.
Cheers
pete

Now that’s a good idea Croaky re the Fobo  T.  Airing up and down  has been  a bit of a problem.
I also use the safety Dave system