Fuel Economy (yes i know.. wh0 cares about it?)

[gt6-v8]

Noob alert ! :-0

I've been running my Rover v8 with weber 500 (4bbl carb) for 300 miles now, and worked out i have no better fuel economy than with a distributor.

I haven't got around to connecting up the MAP yet, so am running on 2d only.

I'm wondering (back to basics) will MAP and remapping give me more mpg? or do i just trim back the advance a bit in all ranges?

currently 16mpg aint too good even on a 3.5 ltr.

People on rimmers site etc are claiming 25 with the same weber and a distributor.

cheers chaps.

[KLAS]

yes, with connected MAP sensor you can get much better mileage at part throttle (assuming you full throttle curve is correct, if not tweaking it will help, too)

[ggzilla]

I care -- it cost me $33 to fill up the tank today!

Yes, for sure. You need vacuum advance for best fuel economy. In general, more advance for more fuel economy. Just don't let the engine ping/pink/rattle/detonate.

I would think a well sorted distributor will give as good of fuel economy as MJLJ. But due to emission control and factory tolerances, not many do; you'd have to blueprint a distributor to be sure. Not to mention most 20 year old vacuum advance units are plain broken. With MJLJ, it's easy to reconfigure the curves.

[mr_bridger]

$33?? man you dont wanna live in the UK!

my Celica takes £50 to fill up.... around $100 US



price is currently about 115p litre (517p gallon) which is over $10 a gallon

Ross.

[KLAS]

$33?? man you dont wanna live in the UK!

my Celica takes £50 to fill up.... around $100 US



price is currently about 115p litre (517p gallon) which is over $10 a gallon

Ross.

i know what you mean

1,51€ per litre ...

[gt6-v8]

cool,
Thanks all.
changed rods 1 more stage leaner today, will test this week.
3mm vacuum hose ordered now.

I'll be back when i screw up my ignition map later