Some electronics still needed to be done for the refuelling. We wanted to have a audio visual indication that the tank is 100% full. As usual when we don’t design a custom PCB we use a breadboard and pot it in epoxy to be resistant for vibrations, humidity, dirt, ….
Because we had some additional potting tasks, we sealed also some isolation “boxes”. We use this to have a galvanic isolation between 12V and our logic signals.
A few pictures from the internals of the fuel tank On the 2nd pic you can see we use an extra optical level sensor to detect completely full. We use 2 suction sides L and R to make sure we always transfer fuel even under heavy acceleration, braking or cornering.
By accident we discovered that an electrical kitchen knife is ideal to cut foam. After some last DIY actions finally we can close the top plate.
Referring to some people he looks like professor “Gobelijn”, but 1 thing is sure, the calibration of the fuel gauge is completely screwed up, I mean okay.
We took 25 calibration points, and between 2 points we calculate everything by interpolation. Despite the sensor is not 100% linear, we are sure we are pretty accurate.
Due to a miscommunication to our CNC guy we have a bit delay in finishing the fuel tank. Last minute we have decided to add an additional level sensor which triggers an 100% full signal.
Due to the fact we come close to the finish, we have decide to reorganize our website a little bit.
In the past it was all about the technical stuff, but not everyone is interested in all technical details. For sure we keep posting technical messages but you will not be redirected anymore to the news tab by default.
The home page describes a bit more about R-box, who are we and what our the goals. From there you can navigate down to all other sections who will get a significant update too in the coming weeks.
Some pictures from the building of the new tank in the BMW.
It was not possible to finish everything because we decided last minute to mount a Staubli connection on the filling hose. This means that we have to change the anodized top mount plate.
We’ve already sent the modified drawings to Tempac to get the plate cut out by laser once again. After this operation it needs to be anodized again.
With the images of Renaud Verreydt during the Condroz rally still fresh in mind, we have decide to redo the complete pump/filter unit in the trunk. Some of the Goodridge tubes are not properly protected in case of an impact.
