Update 4.6 road trip

[ozscott]

Hi all, just a quick update on the 4.6 high compression stock P38a motor with the Thor goodies.

Just did a 2500k road trip through NSW and back to Brisbane. 5 people and all their luggage. Literally could not stuff another water bottle in the truck. Stacking to roof made easier with shelf that I made for the rear (and Milford barrier) . Lots of weight. 2 inch lift, steel bullbars and sliders, 3 x roof bars (rhino) and roof lights on but no basket this time. 31 in light truck tyres.

Ran like a dream with great stonk. In 5th it just pulled hard. Have to really watch it at 110 to 115 as it just wants to race away from there. Up hills laden you really notice the 4.6 versus the 4.0. Up the Toowoomba range making it work in 4th at the top it got to 92 degrees. Most of the time on the highway flats it was 86_87. Up longer Hills at 110 in 5th it would get to 90-92.

The leg up and from the Toowoomba range to first fill averaged 13.7 litres per 100k. On a nice flat section heading up the coastal route it was 12.63 litres per 100k but that was 80 kph in quite a few bits. Tyre pressures were 40 rear and 30 front.

Pic attached of exhaust pipe. Nice and grey. Stock ECU from my original 4.0 and stock MAF and intake so no need to change anything I feel.

Hope that helps anyone looking at a 4.6 upgrade or trying to compare fuel figures from a similarly laden and lifted Td5. She is a very quiet smooth and powerful ride with the 4.6 and114493 31 inch tyres mean the whole thing is geared well for highway travelling and economy also.

Cheers

[Jazzman]

Traitor!

What does it get up the Tele Track and Peninsula Developmental Road in the dry season?

Do you think it would beat 14lt / 100kms of the TD5?

[ozscott]

Haha. I will let you know next June.... It will be higher on the Offroad bits for sure!

Cheers

[ballbag]

ozscott, are those petrol usage numbers or an equivalent of LPG?

eg. 12L petrol = 21.4L LPG at 62c v $1.10 ?

[ozscott]

No mate tanks are gone in favour of more space for all the camping and other gear. I just needed the room. The figures are accurate. I have calibrated my odometer for the increased tyre size based on actual distances and GPS recorded speeds etc. It was a long trip so plenty of fill ups to the same level each time and also taking readings over a long distance.

Perhaps mine runs a little lean... Although the fuel trims are excellent and on the highway long trims are zero or only very slightly negative. Exhaust pipe is dark grey not white or very light grey. Heaps of grunt and no pinging. I put it down to the 5 speed manual and 4.6 with taller gearing afforded by the taller tyres. Having said that I normally get 15.5 to 16 in town...

Cheers

[ballbag]

Gotta be happy with that.

The 4L intake might be restrictive but fuel ratios should still be correct if running the 4L software I would think. Is that right?

[101RRS]

The Thor 4.0 and 4.6 engines have the same inlet systems - my understanding is that it is just the programming of the ECUs is a little different.

[ozscott]

Yep just the programing. There has been a detailed thread on this with Mark Adams and Pedro posting up detailed info. I have just got lucky with mine I think in running the stock engine management for the 4.0.

Cheers

[Tombie]

Scott, that's good. You must be happy with that!

Btw - Exhaust colour test is no good nowadays - no Lead [emoji6]

[ballbag]

The Thor 4.0 and 4.6 engines have the same inlet systems - my understanding is that it is just the programming of the ECUs is a little different.

Thought the MAF and its housing were different. Not the case?

[ozscott]

Ball bag the MAF and runner is different I think but plenum the same.

Thanks Tombie yep mate stoked with the economy. There are quite a few big Japanese 4wd's that those figures would embarrass. I know the D4 diesels would get much better though. Your Puma would also do much better I would imagine. Good point re lead!

Cheers

[Pedro_The_Swift]

Gotta be happy with that.

The 4L intake might be restrictive but fuel ratios should still be correct if running the 4L software I would think. Is that right?


The Thor 4.0 and 4.6 engines have the same inlet systems - my understanding is that it is just the programming of the ECUs is a little different.


Thought the MAF and its housing were different. Not the case?

The 4.6 MAF is different,
the 4.6 inlet piping is different,
the 4.6 airbox lid is different.
and the important detail is--
Ozscots works with a 4L ECM,,
but mine didnt.
and the ONLY way to find out is via your LTFT's
This engine management system is concerned with only ONE thing,, and its not that you're stuck in a creek or trying to pass a roadtrain,, its ONLY and again,, ONLY concern is the crap coming out of its exhaust..


In the D2a's the 4.6 tune is in the ECM,, but you'll need TESTBOOK to swap it over,, I thought there were a couple of members here that had it,, (certainly not used/held any longer at LR dealers).

I am also led to believe there is no such thing as a 4.6 Manual from the factory,,,
Hey Ozscott!!! :cool:
:cool::cool::cool:

[ozscott]

Hi mate. Yes that's a good point I hadn't thought of. All 4.6 V8's were into North America I thought.. So auto only. Which makes my wierd but working well homologation a bit different.

😈

Cheers!

[Matt & Jo]

Hi Guys.
I have a question for Ozscott.
I have also upgrade my Disco 2 2004 from 4l to 4.6. but i'm not having any luck with my fuel economy. The truck wasn't running when i got it. I replaced the old motor with a Disco 2 4L block with 4.6 crank/pistons. 4L inlet and heads. stage 1 cam, Genie headers. She runs on injected gas as well.
She runs smooth on both fuels. But!
she run really rich / over fueling. Just been on the Dino and only 79KW output.
Not to good. I was thinking ECU set for 4L not 4.6L. Sent of my ECU to Mark Adams in the UK to be re-mapped for the 4.6, I also got him to supply the larger AFM and filter lid to suit. Fitted all last week. A better response from the pedal and even a different note. but still over fueling.
The guys at the Dino said maybe the injectors??
Help from anyone. don't know were to look next.

Matt & Jo.

[Pedro_The_Swift]

what are the overfueling symptoms?
LPG or just PULP?

[Matt & Jo]

HI. over fueling on both petrol and LPG.
Injectors are fine, new AFM, sports exhaust. i did remove the filter box and ran straight into the AFM. Idle was rough. was running high flow are filter. replaced back to standard and removed the snorkel intake. idle ok again.
Went for test run and the front drive shaft uni joint gave in. towed back home.
will have to wait until next week to fix.

[peter51]

To sort this out you need to gather some data.
1. Confirm vacuum reading ? idle value and is it steady - I know you built the engine but recheck here first.
2. Read long term fuel trim at idle and in cruise( after about 15 minutes)
3. Confirm idle and WOT values from the MAF in either volts or gm/sec. Snap throttle reading is OK or rev it out in first ? as long as you get several readings.
4. Confirm O2 sensors respond normally - high voltage on WOT( rich reaction) and low voltage at idle when you introduce extra air by removing a vacuum line.

Once you have this evidence, you can work it out.

Data can be gathered by plugging into OBD port to retrieve live data.
As an example I have attached an image of a data steam via OBD ? injector open time, RPM, O2 voltage, MAF in gm/sec and throttle position. We can confirm that all these sensors are returning good data because at frame 258-260 we have 12.3 ms injector open time at WOT, O2 voltage high at 0.96 ( full rich), nice MAF ramp with a max of 82gm/sec and Throttle position 75%.

To see how your ECU is calculating fuel we need to check it is receiving good data.Without it, the job is more difficult.
Try to get this info and you will be able to work it out for yourself.

[Pedro_The_Swift]

This seems like the right spot--
Finally had the chance to do an actual honest to god PULP fuel run,, only took 3 years:rolleyes:
142kays using 17.9 litres.
or
22mpg
or
12 Litres per 100
or
7.9 kays per litre

thats an increase(decrease?:p) from 14 litres per hundred with the 4L

[thai_tiger]

This seems like the right spot--
Finally had the chance to do an actual honest to god PULP fuel run,, only took 3 years:rolleyes:
142kays using 17.9 litres.
or
22mpg
or
12 Litres per 100
or
7.9 kays per litre

thats an increase(decrease?:p) from 14 litres per hundred with the 4L





That's very impressive, I'm not getting much better than that in the Td5, it must make all that tweaking worthwhile and pleasing. well done.

[ozscott]

Great stuff Pedro. I reckon 12l per 100k is the mark for unladen or factory trim without lift etc. Added weight, lift, bull bar etc give them a nudge but not a lot and that's the torque of the 4.6 doing the business. Cheers

[Pedro_The_Swift]

Pity its not a manual,, (for a weekend;))
all that happens now when a bootfull is applied is the box just laughs and downshifts! :lol2: