Thread: 3.9 Economy what do you get?

Hi All,
Glen, it's a GMH 308.stock as a rock. I think I would be able to better the fuel economy with some airbox work, it looks small & restrictive to me. The only disapointment I have is the reluctance of the 3 speed torque flite? auto to kick down, I read an old road test on a late 70s Aston Martin that ran the same box as my Rangie. Might just need a linkage adjustment. i just love to hear it rev! Cheers Scott.

Back in 95 I bought a new Rossignol 3.9V8 Auto. Around Sydney traffic a tank would last 320km. About 11mpg, but on long highway runs 22mpg was common. And I'm not a leadfoot, but I like aircon.

My current 93 3.5V8 auto sucks about 15l for every 100k, country style driving, and it realy needs a good tune.

PS If you're near Lismore NSW and can do this properly, you've got the job! Most mechanics around have an aversion to Discoverys

Cheers, GQ

[quote=PeterM]

Originally Posted by "incisor
no, not the ecu

the ignition amplifier, my original one seemed to go alright but i had heavy fuel consumption and occassional stalls. had it replaced and wala different vehicle. good economy for what it was and a lot smoother.[/quote

Ignition amplifier?? What, where how much? I've dropped to a pretty consistent 20L/100km from where I used to be able to get about 14-15L/100km on the highway.

The ignition amp is on the side of the Dizzy on early models and later ones it sits beside the coill on a mounting plate.
WHAT EVER YOU DO****NEVER!!!!! ATTEMPT TO OPEN IT . *******IT CONTAINS ONE OF THE DEADLIEST POISONS KNOWN TO MAN !****

On a tangent - what method do you use to calculate your fuel consumption ?

G'day All,
Fill to 3rd 'click', drive 100km then fill to 3rd click again 3 times then work out average. [use the same pump at same servo too]

Cheers Scott. [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]

same pump at same servo ? What - drive around the block 100km ? [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img]

[img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img] No, not quite..........I drive the same roads often, working at same place for quite a while! I'm yet to travel a freeway type run yet, I not even going to guess what the usage will be on Stockton's soft sand ops: Still, the sound makes it worthwhile, not to mention the looks when a stock looking 21 year old fourby picks up it skirt and goes, Priceless! 8)

I get between 17 and 22l/100km I'd say. I did a test while moving from Sydney to the south coast. Best I got over 200kms was 17l/100km, no load, but aircon always on. Worst was 26/100km, large furniture trailer on the back fully loaded, and the vehicle loaded to the hilt, also with the aircon on. I did this trip quite a few times and these were my figures.
May have to look into the ignition amplifier thing, and also heard some talk about the vacume advance unit.