D1 V8 economy run.

[RonMcGr]

Just did a trip from Brisbane to Carters Ridge and return. (Took brother back home after his hip reconstruction)

Sat on 100kph (GPS) 104kph speedo, using cruise control, 50 km of hilly road.
Remainder freeway.

Distance 270km
Fuel used 38.5 litres

= 14.26 L/100km
= 19.82 mpg
= 7.01km per litre.

I guess it's not bad, but I did expect slightly better.:(
Motor is stock 3.9, air snorkle and 2.5 in exhaust.

Cheers,
Ron

[mcrover]

I will probably never live this down but........for a V8, that is good.

I get similar when towing or heavilly loaded, sometimes touch 15l/100kms in my TDI but Im expecting it to go back to good economy again since all the work Ive done on it recently.

That is impressive esspecially using cruise, my experiences with it is that it accelerates fairly heavilly and is usually on and off throttle all the time so you dont get great economy using cruise.

[QLDMIKE]

That is great fuel economy. My D1 V8 with those mods never returned those sort of figures. Best it ever did, with a tail wind all the way from Canberra to Sydney, was 15.6L/100km.

It used to get 18L/100km all of the time and 20s around town.

My TD5 only gets 12L/100km on the highway.

[PeterM]

That's pretty good actually. The best I ever achieved with mine was on the New England Hwy and that was 13.5L/100km. The vehicle was stock except for changing the exhaust system from the muffler back (running 205R16 tyres too).

Since you've got a snorkle fitted I'd be very happy with that.

[RonMcGr]

Thanks guys :D

I feel better now :)
Yes I did have the cruise on the whole time on the freeway. It did push the peddle to the floor on some of the hills around Forest Glen. I guest it may have done better with the cruise of on hills.

I wonder how it would go with better injectors and an after market ECU?

Cheers,
Ron

[PeterM]

Imagine the improvement with fitting the O2 sensors and making it a closed loop system like PhillipA has done? Fitting aftermarket injectors could also be handy once that was done.

[RonMcGr]

Imagine the improvement with fitting the O2 sensors and making it a closed loop system like PhillipA has done? Fitting aftermarket injectors could also be handy once that was done.

Thanks Peter,
The 02 sensors are a great idea.
I had forgotten about Phillip and Justin's vehicles.

[Lucus]

Any idea what AFR's the 14cux runs in closed loop?

[tempestv8]

My DII in stock form would probably return around 16 litres per 100 kms on the highway, driving the Hume Highway. You are not just getting good economy there, but I believe you are getting *exceptional* economy - was there a tail wind helping you, seriously?

Since adding all the extra weight to my vehicle, e.g. bull bar, Kaymar rear bar, rock sliders, lift, etc. I average around 19 litres on the highway, and that's with premium unleaded. :(

Weight is the enemy of economy. That's why the Toyota Prado is so economical - it's got a lot less weight. But when those aftermarket mods are piled on, the economy starts getting worse....

[RonMcGr]

My DII in stock form would probably return around 16 litres per 100 kms on the highway, driving the Hume Highway. You are not just getting good economy there, but I believe you are getting *exceptional* economy - was there a tail wind helping you, seriously?

Since adding all the extra weight to my vehicle, e.g. bull bar, Kaymar rear bar, rock sliders, lift, etc. I average around 19 litres on the highway, and that's with premium unleaded. :(

Weight is the enemy of economy. That's why the Toyota Prado is so economical - it's got a lot less weight. But when those aftermarket mods are piled on, the economy starts getting worse....

No mate, it's all true :D
I had the Engel in the back, plugged in and running, one passenger, forward and return.
The vehicle is stock standard SE7 with bull bar.
Only aftermarket items are big bore exhaust and snorkel (slightly altered).
It was a cool day, slight breeze, nothing out of the ordinary. What I did notice was at 99kph (104 on the speedo), the motor was quiet. I assume it must have been that D1's ideal speed as it just cruised along, no fuss at all. Below and above that, that I can hear the motor working.:)

[RonMcGr]

You will all be pleased to know, that around town, the same vehicle is guzzling 25l per 100km...:(

[Pedro_The_Swift]

My DII in stock form would probably return around 16 litres per 100 kms on the highway, driving the Hume Highway. You are not just getting good economy there, but I believe you are getting *exceptional* economy - was there a tail wind helping you, seriously?


before my maf drama I would get 14L per 100 highway pretty consistantly.

[blitz]

Hey Ron that sounds pretty damn good to me. I have a snorkle and 2 5/8 free flow exhaust, I was getting around that BUT then it dropped to about 18 on the highway and about 20 - 25 around town I have done every thing I can think of and a couple of mates who are mechanics have had a look at it and they cant get it any better than I have it now.

But my engine is getting tired now so I have put it down to the worn engine as the reason why it isnt any better.

Blythe

[RonMcGr]

Hey Ron that sounds pretty damn good to me. I have a snorkle and 2 5/8 free flow exhaust, I was getting around that BUT then it dropped to about 18 on the highway and about 20 - 25 around town I have done every thing I can think of and a couple of mates who are mechanics have had a look at it and they cant get it any better than I have it now.

But my engine is getting tired now so I have put it down to the worn engine as the reason why it isnt any better.

Blythe

Blythe,

Mine has done 112,000km :D
I'm hoping it will last a fair bit longer.
Next mod will be an efficient ECU and dyno tune.
I think that may help with the power stakes :)

If yours is getting tired, now is a good time to turn it into a 5 litre powerhouse!

Cheers

[blitz]

I finally had to conceed defeat and take it in to the mechanics compression is now down to 90 psi per cylinder so she has had it I think. will now start looking around to see what the easiest and cheapest options are, but I will probably look for a 4.6 to slot in to her.

Mine has done 240,000km all of them pretty hard so she deserves a better donk in her.

[trobbo]

I have a 4.6 in my D1 with extractors, 2.5 inch exhaust, snorkel and all the other bolt on bits and regularily do 18 - 19 ltrs per 100 (5 - 5.5 k's per ltr) towing the camper on the highway. What's even better is that is on gas. whoot!

For some strange reason I never measure the economy without the camper en tow. Probably cause it always includes a fair bit of off road work and we all know what that does to our economy so I think I'd rather bury me head in the sand to those figures.

[blitz]

[quote=trobbo;774783]I have a 4.6 in my D1 with extractors, 2.5 inch exhaust, snorkel and all the other bolt on bits and regularily do 18 - 19 ltrs per 100 (5 - 5.5 k's per ltr) towing the camper on the highway. What's even better is that is on gas. whoot!

Not wanting to steal this post so hopefully just a quick side step. Do you have the coils or a dizzy fitted to your 4.6?

Blythe

[trobbo]

it's a 4.6 block with all the 3.9 ancillaries. Makes for an easy upgrade. Therefore still running a distributor.

good luck finding a 4.6 block at a reasonable price. They are getting rare these days

[tempestv8]

It's quite possible to simply replace the crankshaft with a 4.6 crankshaft, because the blocks are pretty much the same.

There's also a mob that sells "new" 4.6 motors but typically these are the rejected engine moldings from the LR factory. Sometimes it's just simple things that they can remachine and it's good as new, but sometimes it could be better just to rebuild an existing motor, because those "new" motors could have some tolerances that are out of spec.