HUD and OBD

[TheTree]

Hi

I have been thinking about ways to improve the instrumentation on the beast.

A recent experience with and airlock while upgrading my cooling system has convinced me that the factory temperature gauge is next to useless. The nanocom was registering 112 degrees but the gauge never moved past the middle :angry:

So I have been looking at alternative gauges (where to mount them is a problem) and even went as far as looking at the capabilities or the Ardunio or Raspberry PI as a dedicated OBD reader interface.

However I also hit on the readily available HUD OBD units and I was wondering if anyone else had tried this?

W01 LED CAR HUD Head UP Display FOR OBD Interface Plug Play Speeding Warn System | eBay (http://www.ebay.com.au/itm/W01-LED-Car-HUD-Head-Up-Display-for-OBD-Interface-Plug-Play-Speeding-Warn-System-/151295455669?pt=AU_Car_Parts_Accessories&hash=item2339e971b5)

Still the issue of how to mount and connect it of course!

Steve

[davidsonsm]

Looks interesting - especially for the money.

Installation would be the key - to avoid the wire running over the dashboard to the OBDII male plug in the passenger footwell.

Therefore, I'd suggest you would need to remove the OBDII plug from device (is this easy to do?), and drill a hole in the top of the dashboard in order to thread the wire along the underside of the dashboard.

Is the wire long enough? I suppose the wire could run discreetly along the bottom of the windscreen, if the wire was extra long.

[TheTree]

Looks interesting - especially for the money.

Installation would be the key - to avoid the wire running over the dashboard to the OBDII male plug in the passenger footwell.

Therefore, I'd suggest you would need to remove the OBDII plug from device (is this easy to do?), and drill a hole in the top of the dashboard in order to thread the wire along the underside of the dashboard.

Is the wire long enough? I suppose the wire could run discreetly along the bottom of the windscreen, if the wire was extra long.

Hi mate

My current thinking is; I can cut the plug, extend the wiring and tap into the OBD connector, leaving it free for my nanocom.

I have a OBD double adapter, but it is a rather chunky lead :(

Steve

[Pete38]

Thanks for posting Steve.

I'm sure the wire can easily be extended if need be. Unlikely it uses every pin of the OBD2 port and even if it does it's just a more tedious task of soldering them all. Could fairly easily run the cable below windscreen and around near the passenger door before going discretely down between the dash and the door to the footwell. Or go the drivers side and under the dash which is also easy. I run my handsfree mic under the dash and up the pillar fairly discretely (under the rubber on the pillar).

I have placed an order for one as I like that idea. It will also help with my speedo error with the bigger tyres (mines just over 10% out so fairly easy to work out while driving but still) as the speed can be altered so 100km/h shown is 100km/h. I assume it just scales all the readings (linearly) so all the speeds will be corrected by say 10%. I know there are options to alter the speed feedback but I'm not overly interested in cutting into the speed feedback.

[davidsonsm]

Any idea on how to cross reference the wires? Would they be the same colour. Physically, they go to the same pins on the male/female of course. I've never looked at RAVE wrt to the OBDII plug.

[TheTree]

Any idea on how to cross reference the wires? Would they be the same colour. Physically, they go to the same pins on the male/female of course. I've never looked at RAVE wrt to the OBDII plug.

Hi

I would just match the pinouts, so when I cut the plug off I strip the wiring back and see which colour connects to which pin

Then splice into the wire on the car connector which goes to the same pin number.

A little tedious but easily doable as long as you take care to match the pins and not get confused by male / female and looking at the front or the back of the connectors wrongly :p

Steve

[davidsonsm]

Answering my own question:

Its connector 231 in RAVE (at least for my 98 model year).

[Pete38]

I doubt there will be a problem, but I'm assuming having two things won't cause dramas with communications as long as only one is turned on at once?

Having two things plugged into the port and both turned on will interfere with the communication sent back to the one port wouldn't it?

What comes out of the port probably wouldn't care as it's only resistance changes I assume?

Has anyone run two things off the port before? If so what were they?

[Pete38]

Ok a quick search says that generally two things will interfere with each other unless the message header can be changed. Which I feel is unlikely to be an option with most of the devices we have. I haven't given up full hope but it appears only one can be turned on at once. Hoping someone begs to disagree. Well it won't be that big a problem to only turn one on at a time really.

Edit: On further research it looks like our P38 doesn't use the CAN bus system so multiple devices is not possible. Later Bosch cars like mine do use it but only use it between engine and transmission ecu.

[TheTree]

Pete

You are correct that the P38 does not use CANBUS, I suspect it is ISO-9141.

And yes, because the OBD port is a serial port, only one device can talk to it at a time, which means the HUD device would need to be off to use a nanocom etc

Steve

[Hoges]

The Torque App on an android phone or small tablet (with inbuilt GPS) and Bluetooth dongle in the OBDII socket does this :p...just set the torque App display to HUD...reverts to a laterally inverted image for reflection in the windscreen ... fairly useless on a sunny day, but so are most others. Works very well at night. ;)

[szo]

The Torque App on an android phone or small tablet (with inbuilt GPS) and Bluetooth dongle in the OBDII socket does this :p...just set the torque App display to HUD...reverts to a laterally inverted image for reflection in the windscreen ... ;)

This is what I did when I had cooling issues. But I placed the 7inch tab on the shelf behind the steering wheel, the HUD would then show the temp inbetween the rpm and kph dials. Worked well even in daylight.

[Hoges]

This is what I did when I had cooling issues. But I placed the 7inch tab on the shelf behind the steering wheel, the HUD would then show the temp inbetween the rpm and kph dials. Worked well even in daylight.
:eek::D I must try again on a sunny day! Perhaps it was the polarised sunglasses?

[szo]

It could also be the tablet, I've tried it with two different ones and one was much brighter than the other.