Nissan 2003 TD42Ti Fuel Consumption.

[drgtr]

I have done searches and internet trawling

I noticed on average its anywhere from 14 litres per hundred kms to 16.5 litres per hundred.

Unfortunately My one is the latter. Even after a dyno tune. My car goes much harder but seems like its still around 16 litres per hundred.

Idles fine. Drives fine. Starts up fine. Temperature is fine.

Am I miss something of is this normal?

Dyno Tuners said my injectors and Pump are in excellent condition.

What are you guys on average getting out there?

[TimE]

What size are your tyres? I'm around 16l/110kms running 33s.

[drgtr]

275/70/16 Bf Goodrich All Terrain KO on 40psi.

I have a 2 inch lift
3 inch exhaust
Larger Top mount intercooler
Turbo Smart Bleed Valve Boost Controller

[drgtr]

Are The manual gearbox ratios and diff ratios on the 2003 3 litres the same as the 4.2tdi?

The car has been converted using same year model 4.2tdi donor car
It was originally a 3 litre manual.

Was done professionally by the previous owner who owns a quality Diesel mechanic workshop.

Just giving much info as I can so any of you guys can determine if something is astray.

[TimE]

Not sure, my diffs are 3.9s (standard for a GU IV 4.2tdi) yours may well be different.

[drgtr]

Not sure, my diffs are 3.9s (standard for a GU IV 4.2tdi) yours may well be different.

GU 2.8 Diesel = 4.625:1
GU 3.0 Turbo diesel auto = 4.375:1
GU 3.0 Turbo diesel manual= 4.11:1
GU 4.2 Diesel = 4.11:1
GU 4.2 Turbo diesel (wagon) = 3.9:1
GU 4.2 Turbo diesel (ute) = 4.11:1
GU 4.5 Petrol = 4.11:1
GU 4.8 Petrol manual = 4.375:1
GU 4.8 Petrol auto = 3.54:1

I wonder if he left it at 4.11
So does that mean Im revving higher at 110kmh? if left at 4.11? (if he did)

[drgtr]

Different site specs
3.0TD Man 4.375 diffs and usually H260 rear diff
3.0TD Auto 4.375 diffs and usually H233B rear diff

4.2 TD Man 3.900 diffs and usually H233B rear diff

Could explain why higher fuel consumption

4.375 compared to 3.9

Next time Im at 110kmhs I will take note of my 5th gear RPM and let you guys know.

[drgtr]

And if I do change rear diff ratio? I have an e locker on the rear. Would this affect it?

Also rather than changing diffs can I just go 35 in tyres?

[drgtr]

Found a pic few weeks back. Looks like 4.375 diffs. Revving too high

So around town I will be okay on fuel.
Highway Its gonna suck lol

Time to get 35s

Can anyone confirm this seems to be the case

74661

[TimE]

For me on 33s and 3.9:1 diffs 2,000 rpm is 95-96 kph.

[garett]

mine is a gq but 4.1 diffs 33's 2200 to sit on 100.

[drgtr]

I just read the compliance plate . HG43 so centre diff is HG and ratio is 43.
So I would assume 4.3 ratio was never changed to 3.9.

Im happy. Abit of thinking and troubleshooting why my fuel economy is about 1.5 to 2 litres more than it should.

Nothing wrong at all. Just need to improvise by change to larger tyres.

Now next question.

-Will 35 inch tyres rub with 2 inch lift?
- Can I go 33 inch or 35 inch on stock GU allow wheels with its offset?
-Steel rims feel heaps heavier but do they cause more fuel consumption negating my larger tyre idea or are they okay?

[mudski]

Mine on 33's, 4.11's at 100clicks Im on 2450rpm. Fuel usage, I'm not sure. Haven't really worried about taking note. Its a 3T 4wd. Fuel consumption wont be great in any way. From my observations over the years, 16.5lph seems to be the norm for a TD42.

[drgtr]

Mine on 33's, 4.11's at 100clicks Im on 2450rpm. Fuel usage, I'm not sure. Haven't really worried about taking note. Its a 3T 4wd. Fuel consumption wont be great in any way. From my observations over the years, 16.5lph seems to be the norm for a TD42.

Cheers Mudski. If what you say is true 16.5 or so is the norm then I wont be too fussed.
It was still better than my prado 120 v6 at around 17.5 to 18 and that was babying it. The td42ti you can give it a spirited drive quite abit and it doesnt seem to change much.

[Touses]

mine is a gq but 4.1 diffs 33's 2200 to sit on 100.

Mine is exactly the same. Haven't as yet done a fuel survey, still not gone over the dyno.

[garett]

Mine is exactly the same. Haven't as yet done a fuel survey, still not gone over the dyno.

i get N/A fuel economy so thats about 11 ish per 100.

[Touses]

i get N/A fuel economy so thats about 11 ish per 100.

Ok, so yours is NA and mine is ic turbo. Still doing same revs at 100 but i'm using 3- 4 lb boost. Mine is a ute, reasonable to expect similar figures unloaded?

[garett]

Ok, so yours is NA and mine is ic turbo. Still doing same revs at 100 but i'm using 3- 4 lb boost. Mine is a ute, reasonable to expect similar figures unloaded?

because turbo i'd guess a litre or two more. but depends on how you drive it. mines so slow theres no point being in a rush

[drgtr]

because turbo i'd guess a litre or two more. but depends on how you drive it. mines so slow theres no point being in a rush

lol That's funny

So what are the 3 litre guys doing? at 4.375 ratios. They just revving high too at 110kmh and just putting up with it?

[Ben-e-boy]

Mine on 33's, 4.11's at 100clicks Im on 2450rpm. Fuel usage, I'm not sure. Haven't really worried about taking note. Its a 3T 4wd. Fuel consumption wont be great in any way. From my observations over the years, 16.5lph seems to be the norm for a TD42.

I've never seen that fuel usage on road.
The worst I got was 15lph on my big tune, 12.4lph at 200rwhp and 10.8 at 120rwhp, 11.8 NA
The worst consumption was all related to the pump setup. It had huge amounts of off boost fuel, last time I put it on a bench I reduced the offboost fuel by about 45%
Never got a chance to test it properly though :( general obsevation showed an improvement, but no figures to validate.

[AB]

Yeah I'm similar to Bennys figures but didn't say anything as not sure if heavier gu would make much difference.

Only time I was getting 16 litres was towing the 1T pop top.


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[katwoman]

Mines not intercooled, but fully loaded across the simpson desert it averaged 14L/100. Daily driving it averages 11L (without the gas injection)
16L seems excessive ??? And I dont generally drive like a nanna.

[Winnie]

Yeah I'm similar to Bennys figures but didn't say anything as not sure if heavier gu would make much difference.

Only time I was getting 16 litres was towing the 1T pop top.


Sent from my iPhone using TapatalkI get around 15lph towing my small camper but unloaded is more like 12-13, my car is around 3 tonne.

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[warthog1]

Mine has 33 muds and a roof rack with a 3.5 inch lift.
14.7 l hundred
The muds and roofrack cost about 1.5 ltrs a 100.

[Cuppa]

31" tyres
2006 TDi42

Touring/towing Tvan/ all up weight around 5 tonnes/rear canopy (wider than cab) with roof mounted solar panels/in Tassie up & down a *lot* of hills/ stock except for 3" exhaust & mild dyno -13psi .....averaging around 16litres/100

[GQtdauto]

Going to be interesting to see if I get an improvement in fuel economy I was getting around 18 litres to the hundred I reckon and that's around town but I did get as low as 15 so maybe pump is the problem.

[mudski]

I've never seen that fuel usage on road.
The worst I got was 15lph on my big tune, 12.4lph at 200rwhp and 10.8 at 120rwhp, 11.8 NA
The worst consumption was all related to the pump setup. It had huge amounts of off boost fuel, last time I put it on a bench I reduced the offboost fuel by about 45%
Never got a chance to test it properly though :( general obsevation showed an improvement, but no figures to validate.

Seems I stand to be corrected. It was just my observations from speaking with other owners whilst chatting at different workshops. My GU sits just on 3T with full tanks. So its not light.
I do believe mine is in dire need of a decent tune though as my last Christmas trip towing the camper, I had to hit the reserve tank button around 80ks earlier than every other time before doing the same trip. And my water temps were higher than usual too. Coincidence? Im more concerned about the water temps than the fuel usage though...But I have zero time now to get it done so it will just leave it.

[Ben-e-boy]

Seems I stand to be corrected. It was just my observations from speaking with other owners whilst chatting at different workshops. My GU sits just on 3T with full tanks. So its not light.
I do believe mine is in dire need of a decent tune though as my last Christmas trip towing the camper, I had to hit the reserve tank button around 80ks earlier than every other time before doing the same trip. And my water temps were higher than usual too. Coincidence? Im more concerned about the water temps than the fuel usage though...But I have zero time now to get it done so it will just leave it.

On a stone cold start is it a bit grumpy for the first few seconds?

[mudski]

On a stone cold start is it a bit grumpy for the first few seconds?

Only if I haven't driven it for over a week or two. I'll add to my above comment Benny that this is only after since getting new injectors installed too.

[Ben-e-boy]

Only if I haven't driven it for over a week or two.

Did you get high crack pressure injectors?

[mudski]

Did you get high crack pressure injectors?

Hmm, I know they are high flow injectors. The first set died and even though they were only 35k old, out of warranty and the mob who made the injectors werent interest in helping out.

[Ben-e-boy]

Hmm, I know they are high flow injectors. The first set died and even though they were only 35k old, out of warranty and the mob who made the injectors werent interest in helping out.

Mmmm you don't need high flow injectors, or high crack pressure for that instance. (Im assuming there's higher pressure too)

I used to have high crack pressure when it was the style at the time. But they dont stay at the set pressure for long, effectively changing your injection timing, using more fuel and grumpy when stone cold.

Standard injectors at standard pressure will do

[mudski]

Mmmm you don't need high flow injectors, or high crack pressure for that instance. (Im assuming there's higher pressure too)

I used to have high crack pressure when it was the style at the time. But they dont stay at the set pressure for long, effectively changing your injection timing, using more fuel and grumpy when stone cold.

Standard injectors at standard pressure will do

Yeah not sure mate. Thats just what was in there. So thats what went back in.

[AB]

I thought there was no such thing as high flow injectors Benny, wasn't it just crack pressures only?


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[drgtr]

I do notice that GQ td4t and GU utes get way better consumption as a whole. No Doubt this is a weight advantage.


The GU TD42Tdi wagons are higher fuel usage.
For me Im sure it was the 4.3 Diff revving high on 110kmh which I did twice or once a week for 60kms

Everything else is in perfect condition.

[drgtr]

Seems I stand to be corrected. It was just my observations from speaking with other owners whilst chatting at different workshops. My GU sits just on 3T with full tanks. So its not light.
I do believe mine is in dire need of a decent tune though as my last Christmas trip towing the camper, I had to hit the reserve tank button around 80ks earlier than every other time before doing the same trip. And my water temps were higher than usual too. Coincidence? Im more concerned about the water temps than the fuel usage though...But I have zero time now to get it done so it will just leave it.

I hate reading that. About the water temp.

Do you think its just cooling system maintenance is due?

What kind of temps were you seeing and under what conditions?

[drgtr]

Mines not intercooled, but fully loaded across the simpson desert it averaged 14L/100. Daily driving it averages 11L (without the gas injection)
16L seems excessive ??? And I dont generally drive like a nanna.

lol. how the hell is it that low?
Thats amazing

how you calculating that consumption out of curiosity :)

[mudski]

I hate reading that. About the water temp.

Do you think its just cooling system maintenance is due?

What kind of temps were you seeing and under what conditions?

No the system is well up to scratch. Rapid cool copper rad, G35 fan, re oiled hub, high flow water pump, hi flow thermostat. Air flow is good. I noticed the higher temps about 5 minutes after leaving the workshop.
I.e At 100kph, I would see 80c, and 85c at 110c. Under load up a hill at 60k's, 85c, now its 90-95c, towing my camper at 100ks used to be 85-90c, now its 95-110c. The workshop just fobbed it off as being summer. Well, yeah maybe but when I drive it in and I drive it out and i instantly see the change. I am not so sure.
I just need to get my Patrol somewhere else for a second opinion and tune sometime.

[drgtr]

What did you have done at the workshop? A tune?
You got some serious cooling gear on her. Thats awesome!
Sounds like a tune issue. Bad tuning can mean heat I have seen.

Im sure its something simple. Keep us updated.

[drgtr]

Have you got pics of your car and engine bay?

35s went on today lol.

Lets see how this goes hey

74665

[katwoman]

lol. how the hell is it that low?
Thats amazing

how you calculating that consumption out of curiosity :)

I use a fuel manager app when I'm being lazy. or:
Divide distance by litres used to get km/litre.then divide 100 by km/litre.
My car is also gas injected. When tuned I get 9L/100.


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[Ben-e-boy]

I thought there was no such thing as high flow injectors Benny, wasn't it just crack pressures only?


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I thought so too. Unless they are custom made

[mudski]

I thought so too. Unless they are custom madeThe pump is from Ag Diesel, I assume the injectors are too...

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[the evil twin]

35s went on today lol.

Lets see how this goes hey



Larger dia tyres normally increase fuel consumption as they are effectively harder for the engine to turn.
Be interesting to see how you go.

[nissannewby]

I thought so too. Unless they are custom made

There isn't. The injector is purely set at a crack pressure. The pump supplies more volume not the injector. Its just a term to make it sound cool.

[Ben-e-boy]

There isn't. The injector is purely set at a crack pressure. The pump supplies more volume not the injector. Its just a term to make it sound cool.

I assumed so, but a mob in Wollongong make their own in house.

[NissanGQ4.2]

how you calculating that consumption out of curiosity :)

Use 2 use an Excel Spreadsheet when I could be bothered

If you use excel I can email you the file, i would put it here for you but the forum doesn't support upload like that.

Edit: This is the spreadsheet I use 2 use: https://www.dropbox.com/s/5zckpbx7gxur5m9/Running%20Costs%202003.xls?dl=0

[drgtr]

Use 2 use an Excel Spreadsheet when I could be bothered

If you use excel I can email you the file, i would put it here for you but the forum doesn't support upload like that.

Edit: This is the spreadsheet I use 2 use: https://www.dropbox.com/s/5zckpbx7gxur5m9/Running%20Costs%202003.xls?dl=0

Legend. Thanks Heaps mate.