Quote:
Originally Posted by some_other_dave
I have an MPGuino for my car. Not in the car, but at least it's built... 
You hook it up by hacking into the engine management system's wiring harness. Well, hopefully you "carefully and tastefully connect it into" the harness. It needs to be connected to one of the fuel injector signal wires, the VSS wire (on our cars that comes from the instrument cluster), and switched power and ground. I think that's it. You have to find which wire is what, and tap into them. I'm still dithering about exactly how I want to do that...
The fuel gauge in my current CRX and its 1990 Si predecessor is very nonlinear. I can go over 100 miles in the top 10% of the reading on the gauge. The next 100 will take me to the halfway mark on the gauge. The next 100 miles will put me just above the empty mark, and by the end of the last 100 miles the needle on the gauge will no longer even be touching the empty mark. And then it'll take about 9.5 gallons (in my car, that's out of about 11) to the auto shut-off of the gas station's pump.
Oh, and all of my Hondas would have gauges that read lower when first starting the car in the morning, and would read higher after driving around for a while.
-soD |
I understand the wire connections. Although the VSS is a bit of a question. We/I have a cable speedometer. It is a 1990 HF. So, do I still have a VSS? I do not have Cruise Control. I think we also need to know the flow rate on the injectors. I have no idea where to find that info. I think we need to know that in order to program the MPGuino. My gas gauge is very inconsistant. Not realted... My last tank was 43 MPG. Not really very good for the HF. Tank before that was 47. That is my frustration. My traveling distance or highway/city% driving does not change much at all. Everything else I have done is now consistant. With my ELD inop if I drive when it is dark and my lights are on can the drag from the altenator be causing a decrease in fuel mileage? That is the only real variable now. I might fill up in the afternoon when it is light and drive the 75 miles home in the daylight. But other times I might fill up by the house and my first stint will be early morning to work, in the dark. That is the only thing I can come uip with now. I am on the freeway about 55miles. The other 20 is country roads. With little traffic yet a bit hilly. I can let my speed vary quite a bit so I will be very light on the gas pedal going up hills and accelerate going down hill as explained earlier. I can handle 45MPG or even 40 MPG if it were consistant. However, if all I am going to get is 40MPG then I might as well get a newer civic or focus. I know they are rated at 35MPG highway but there is a lot to be said for comfort and safety of newer cars.
I am driving in heavy deer populated areas. Northeast central Ohio to be specific. I saw 6 deer along the road running around Monday morning on the way to work. I don't imagine a CRX hitting a deer would be a good thing for either of us.