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Australian Falcons Discuss the australian born and bred models here. Includes the 80's 90's and present day Falcons offered by Ford Oz.

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post #1 of 13 (permalink) Old 06-24-04, 07:16 AM Thread Starter
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Fuel mileage????

351c 4bbl manifold carter thermoquad mild cam nearly standard engine how much fuel consumption should i get per k? or 100k

how much fuel can i fit in the tank? (its not a long range tank)
i think its about 80 ltrs but im not sure

i used $50 worth of fuel this week only going to work and back home approx 150ks total distance mostley 60km/h and about 20 traffic lights 30 min trip
15ks to work approx
$1 per 3 kays approx
$80 - 240 kays approx
am i right??????

will it vary depending on speed limits say i take the hwy 100km/h?

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post #2 of 13 (permalink) Old 06-24-04, 04:14 PM
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Re: Fuel mileage????

Sounds about right for a badly tuned stocker. Probably won't get much more when tuned probably add another 50k's per tank. What would also help is get rid of the 2.77 or 2.92 diff you have. Run a 3.23 or something around that. That'll help. Most your fuel usage would actually be taking off.

Before I ripped mine apart I used to get $350-380k's per tank running 3500rpm histall and 4.11 gears behind a very modified 351.

Brenden

XB Fairmont (street car) 11.07@123.02mph.
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post #3 of 13 (permalink) Old 07-01-04, 09:35 PM
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Re: Fuel mileage????

I have squeezed over 500km from a tank. That was with a 3:1 diff, thermoquad, factory 4 barrel manifold and 204/214 cam.

With a 3.5:1 diff, 214/224 cam and ported heads, it still achieved around 16 l/100km.
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post #4 of 13 (permalink) Old 07-05-04, 05:46 AM Thread Starter
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Re: Fuel mileage????

what is my diff good for then if it is a 2.77 or 2.92 lsd diff ? top speed?
so a 4.11 is it for acceleration?
im not sure my car isnt built for drag purposes i built it to use as a daily driver and as much as i love it im not on a huge packet so i need to keep the cost down
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post #5 of 13 (permalink) Old 07-05-04, 06:07 AM
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Re: Fuel mileage????

Quote:
Originally Posted by benXaGt
what is my diff good for then if it is a 2.77 or 2.92 lsd diff ? top speed?
so a 4.11 is it for acceleration?
im not sure my car isnt built for drag purposes i built it to use as a daily driver and as much as i love it im not on a huge packet so i need to keep the cost down
Depends on where you live and your surrounds. If you have 100k zones everywhere? You'd be best to stay with the hwy diff. If you have 60/80k zones? You'd be better off with a 3.23 or 3.5.

My mates worked 302 running a 3.5 rearend only gets 70k's per tank more than me. Thats 49ci less! His does around 450k's per tank.

Brenden

XB Fairmont (street car) 11.07@123.02mph.
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post #6 of 13 (permalink) Old 07-05-04, 06:16 AM Thread Starter
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Re: Fuel mileage????

oh cool so if i lived in the country my diif would be good for higher speeds.
i live in a area where theres alot of 60/70/80 zones so changing my diff might be a good idea
How does the ratio affect fuel consuption?
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post #7 of 13 (permalink) Old 07-05-04, 04:21 PM
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Re: Fuel mileage????

It's only affected during take off(stop/go driving). If you drop down a few ratios you'll use let pedal to take off hence giving you better fuel econ.

Brenden

XB Fairmont (street car) 11.07@123.02mph.
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post #8 of 13 (permalink) Old 07-05-04, 07:04 PM Thread Starter
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Re: Fuel mileage????

do u reaken i should get a 4.11 diff then?
i do alot of slow driving mabey a freeway run twice a fortnight
are these diff centres rare how much could i expec to pick one of these up for
complete 9inch 4.11 disc ?
and what cars came out with this diff?
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post #9 of 13 (permalink) Old 07-06-04, 11:23 AM
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Re: Fuel mileage????

I have a stock 302 with a 350 holley .... 60 buck to about 450-500kays
... gotta do somthing about that the 350 sucks ass for power.

EB2GHIA Long Gone


1973 XB Coupe Fairmont 302, koni shocks, lovell super low fronts, extra leaf and reset leaf spings, dual exhaust, advance headers. Resprayed Vivid Blue Pearl. 17x8 & 17x10 inch FR Simmons.
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post #10 of 13 (permalink) Old 07-06-04, 06:09 PM
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Re: Fuel mileage????

Quote:
Originally Posted by benXaGt
do u reaken i should get a 4.11 diff then?
i do alot of slow driving mabey a freeway run twice a fortnight
are these diff centres rare how much could i expec to pick one of these up for
complete 9inch 4.11 disc ?
and what cars came out with this diff?
No i wouldn't suggest 4.11's unless you have the engine setup that requires it. 3.5's is about as far as you'd go otherwise. 9" diff's aren't exactly cheap but you can pickup the appropriate ratio for about $500-$1000 reco.

Brenden

XB Fairmont (street car) 11.07@123.02mph.
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