alexbrown64
NAXJA Forum User
- Location
- Australia
A lot of guys are chasing bad fuel economy on their modified Jeeps. We know the modifications don't help and already poor performer when it comes to economy. Being OBD1, we dont have an overhead fuel computer, and scan gauges don't work.
Anyway, my modified 95 4.0 XJ in Australia is returning around 12.5 mpg. I was hoping better numbers.
To help me work out what modifications, including driving style would help, i needed a mpg gauge, showing real time data for the OBD1 Jeep.
A lot of research on ecomodder websites led me to a local guy that has built a touch screen mpg gauge for our Jeeps (still in trial phase).
The wiring only takes a basic 12v and ground for power, and 2 inputs which come from the ECU. You pin into the VSS wire and any of the injector wires.
After some initial setup and calibration, which can include a few tank fills and a test drive, the system uses the vehicles speed/distance, tank capacity and microsecond of injector time per litre of fuel to show a lot of different parameters on a color screen such as Distance to Empty, real time MPG, average MPG etc..
This system is still in development, but has been returning 99% accuracy levels.
The system can be swapped between mpg and litres/100kms.
Just thought i would share a pretty cool mod that can really make life a bit more economical.
I am currently installing the gauge in my '95 RHD 4.0 XJ. Will report back with more pics and details over the coming weeks. Sorry, the pics of the gauge are set to metric, but it is simple to switch over. Once i have it up and running in the truck, i will swap it over and show real time data in mpg.
Cheers,
Anyway, my modified 95 4.0 XJ in Australia is returning around 12.5 mpg. I was hoping better numbers.
To help me work out what modifications, including driving style would help, i needed a mpg gauge, showing real time data for the OBD1 Jeep.
A lot of research on ecomodder websites led me to a local guy that has built a touch screen mpg gauge for our Jeeps (still in trial phase).
The wiring only takes a basic 12v and ground for power, and 2 inputs which come from the ECU. You pin into the VSS wire and any of the injector wires.
After some initial setup and calibration, which can include a few tank fills and a test drive, the system uses the vehicles speed/distance, tank capacity and microsecond of injector time per litre of fuel to show a lot of different parameters on a color screen such as Distance to Empty, real time MPG, average MPG etc..
This system is still in development, but has been returning 99% accuracy levels.
The system can be swapped between mpg and litres/100kms.
Just thought i would share a pretty cool mod that can really make life a bit more economical.
I am currently installing the gauge in my '95 RHD 4.0 XJ. Will report back with more pics and details over the coming weeks. Sorry, the pics of the gauge are set to metric, but it is simple to switch over. Once i have it up and running in the truck, i will swap it over and show real time data in mpg.
Cheers,