Thread: Fuel consumption V8

hey thanx mate yeh took it to mr automotive today first thing they saw that the hose was on wrong side he said thats the timing advanced straight up will let u know what they find its there for a few days getn service stuff done as well

Originally Posted by shaunp

I'll say it again check the vac advance diaphram is not toast, this is good for 50km at least per tank, and set the timeing at 6 before

My vac advance was totally toasted. I replaced it. This had no effect on any of the problems I had with the car. As with every repair I do, it got better for a day or three, then went back to it's old ways. :O(

bugger i am hoping this fixes it i love the
car lol

I've got the same horrible fuel consumption you do, roughly 150-170km from 30-35L of petrol and 200km from 70-75L of LPG. Does it make a difference what octane lvl of fuel you run?

Originally Posted by Apocalypsse

I've got the same horrible fuel consumption you do, roughly 150-170km from 30-35L of petrol and 200km from 70-75L of LPG. Does it make a difference what octane lvl of fuel you run?

Sounds like I've got the same setup as you (scuba tanks?) and that's about the worst I get on LPG, although it is all city driving mostly with air con going so that could have something to do with it...also got a big a$$ cage roof rack on it...hmmmmmm

I run premium unleaded only, apparently it makes a fair difference on fuel economy but you never really know unless you try and log all of them for a decent amount of time.

Originally Posted by Young Angus

Sounds like I've got the same setup as you (scuba tanks?) and that's about the worst I get on LPG, although it is all city driving mostly with air con going so that could have something to do with it...also got a big a$$ cage roof rack on it...hmmmmmm

I run premium unleaded only, apparently it makes a fair difference on fuel economy but you never really know unless you try and log all of them for a decent amount of time.

Yea scuba tanks with cut down petrol tanks. I've been running Premium 98 until just now I filled with 95, its only a 4c per litre difference but worth a try. Freeway driving extends my range a bit, haven't used aircon enough to notice a difference in fuel economy.

Since I stopped towing the car trailer with the D1, I have been screwing the LPG volume screw in, quarter of a turn at a time. I did get down to 17l/100km, but it was so slow it was like driving my old diesel 2A. So I wound it back out half a turn and its now doing 19/100km. It has done 356,000k.

Originally Posted by Mattskii

My vac advance was totally toasted. I replaced it. This had no effect on any of the problems I had with the car. As with every repair I do, it got better for a day or three, then went back to it's old ways. :O(

Vac advance does the following
it advances the timing in line with mainfold vac, ie more vac, the more advance. This has 2 effects to an engine, increased fuel ecconomy and lower engine temp. So at cruise and light throttle when the engine is not loaded up it will have an effect on fuel consumption. Max vacuum is at cruise basically. If you conatantly use WOT it has little effect as you would have low vacuum in any case, in this case the only advance you get above static timing is ude to the centrifugal (mechanical) advance in the dissy which would be all in at around 3k rpm I guess.
It makes a differeance trust me.
What were you tring to fix?