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just watched a repro rally car finish on ebay.. quoting 4-6 mpg....
my 4.6 is bad on fuel, never done the maths myself.. proberly to scared. but was wondering what any other 4.6,s were getting?

Your first instinct is correct. You don't want to know.[:D]



- - - - TR7 Spider - - - - - - - - 1978 Spitfire - - - - - - 1976 Spitfire - - 1988 Tercel 4X4 - Kali on Integra - 1991 Integra - - Yellow TCT

It has more to do with the way rally cars are driven than the 4.6
In the recent WRC round we based our fuel requirements on 2 km per litre in competitive stages and 4 km per litre in transport or liason stages.My mate with his 2.1 litre nissan engine used the same calculation. He uses a 5.1:1 dif and 14" tyres we use 4.1:1 diff and 15" tyres.
These figures worked out to be pretty close. For the rally we did 240km competitive and 500km transport and used 287 litres in 3 days.
Plus what the service ute used. Our car is only 3.5 litres and 8.13:1 compretion ratio and 160 HP at the wheels. I do have a new engine on a stand that we are building which is considerably larger capacity and 10:1 compression. Woody from the Wedge shop is estimating somewhere in the mid 300 HP range.[:D]

Cheers Troy

Trickyx, when my 4.6L TR8 was putting out somewhat less than the 280BHP it had produced on the dyno, it could use up to 24L/100Km when really thrashed. On a Sydney Brisbane run, on one stretch it used only 12.9L/100 for a tank full. It had an overheating problem in heavy traffic, on 30-C days.

Since then it has had some performance modifications, & is producing over 320BHP. After the modifications, but before propper tuning, just some mucking with the laptop, I did 2,900Km, Brisbane to Wollongong & back with about 30% city running. My overall consumption was 10.1L/100Km. The overheating was so much reduced I could use the air conditioning in city traffic on a 27-C day.

From a different angle, I have raced a number of cars around Bathurst including F1 V8 Brabham Repco, F11 Brabham Ford [1100cc], FJ Lotus 20 Ford 1100cc, Morgan +4 2.0L, Holden Monaro, Ford GT HO, & even a Hillman Imp, among others.

They all but the Imp gave 7 miles/gallon

[:D] Obviously we were better drivers that that rally mob. [}:)]

I know this sounds ridiculous, but that's what they used. If you would like to cover the expenses, I'd happily run the 4.6L V8 in a race there, to find out how it compares for you. [:D]

Hasbeen

We only count the front wheel km not the rear wheel distance covered. I have seen a 100% difference in wet rallies.[8D]

Cheers Troy

No wonder the rubber doesn't last too long.

Hasbeen

Hi,

As my learned friends say, depends how its driven. If i thrash mine around then single figures are very possible but on the motorway at a steady 70 then almost reasonable, 2.84:1 diff ratio helps alot with that figure. The rally replica you were watching has a 3.90:1, with the torque a 4.6 gives you IMHO way to low.

Cheers John


LIVE LIFE A QUARTER OF A MILE AT A TIME!

1976 Speke FHC Beauty

1979 3.5 FHC(STATUS PENDING!!)

1982 2.0 DHC NOW A 4.6,ON THE ROAD NOW KICKING AR5E !!!!

Our rally car with twin 45 Webers as per the factory 79 spec does about 6 mpg, on a run about 11, then your worrying about the short life of the tyres. Was hoping to get a bank loan to drive it to the NEC.


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i know its down to how big your right foot is or how many smiles per mile your doing!!! so wots the best? so i worked out 22 mpg on a run down under... to 11 mpg when trashed.