Digital Instrument Gauges based on PLX SM-AFR and MFD

Ill check out the spec on that chip as sounds like it maybe an option. Nice project. Keep posting updates and once I get beyond the inception phase with mine will do the same.

My first job was as a C programmer so you have made me all nostalgic

 

I am still back at my roots. Started with programming a Z80 CP/M computer in C back in 1984 at Philips Research Labs Redhill. Now landfill (both the computer and the building)

 

Some pictures : The engine bay computer with all its wiring




The industrial oil pressure sensor



The oil pressure relay - converts small voltage into opening a relay when pressure > 5 psi


Dash display. I think it shows a peak of 4085 rpm , not 4805 rpm ..
Turn left knob to change left display, right knob to change right display. Press knob to reset min/max


Battery display : well charged : Leisure Volts: Starter Volts2 while on hookup power


Engine running after start.


AFR and MAP

RPM and AFR

CHT and MAP : engine off : CHT sensor behaving itself.

 

A diagram showing all the bits I have added...
http://host.hamble.online/vowo14/inst/CamperVanEngineBay.pdf

 

The good news is that the oil pressure sensor worked well on the trip to and from the Slough Swapmeet, with maximum operating temperature of 120 degrees C, and the oil only getting to 115 degrees C...
And best of all, it does not leak when screwed into the engine block unlike the stock oil pressure switch which seemed to be seeping enough to leave marks on the engine block.
It has a longer tapered thread.

Maximum cold start at 0C so far was 86 PSI. Minimum hot idle about 9PSI at 750rpm / 110 degrees C oil.
Normal running about 40-45PSI.

 

Have you reached 88.8 mph yet doc?

 

And I thought my coil was crowded !

 

It worries me too.

Coil +

• Black wire ignition feed
  
• Accuspark Red
  
• Reversing Light
• Oil Pressure Light Relay power
  
• Engine Bay Computer

Coil -

• Accuspark Black
• Rev Counter to Computer

I think the time is coming for another fuse box in the back - especially when the FI system goes in.

Today at -1 degrees C, the oil pressure went to 104 PSI so I have changed the oil for 20W/50 from SAE30.

 

Remind me what FI you are using? I'm nearly there with my motor bike FI

 

I have an old Golf MK2 mechanical CIS system, with bits of Porsche and Ford XR3i added. The project keeps being stalled as something else happens that I need to fix first.

The great thing about it is you power the fuel pump and a warm up regulator which alters fuel pressure for cold starting, and then there is a single electromagnetic cold start injector. So it has no electronics, and the cold start injector could simply be a dash mounted button (it turns out that the Golf crowd occasionally use something like this button to fire the fifth injector for mixture enrichment at speed as well ... )

Its a stepping stone towards a full electronic system, as once I have the throttle body and the manifold for FI fitted, then it will be simple to fit the modern electromagnetic injectors in place of the spring loaded spray nozzles used in CIS (Continuous Injection System)

 

Mike chill! Have a glass of Wine


Sent from my iPhone using Tapatalk

 

I read your very detailed write up but in my mechanical engineering head it became "I put some technical electrical stuff in the van and did some computery stuff and got some bits quite cheaply and made it all work".
I've no idea how you did it but having those two gauges telling you so many different things is brilliant.