Outer Limits 4x4 Board

hi there, im looking at getting one of these, but i want to run it on gas, ive heard some bad things about these on gas and just looking for some more opinions.
cheers

thats news to me ive heard they are brilliant on gas same as the 4.5s.

do not do it to yourself... if you put it on gas it will have the reliability of a zd30 with 25,000 km service intervals... as were the 4.2 (TB series) prone to crack around the guides as are the 4.8s and 4.5s , they burn vavles out and get valve res.. very very very bad idea.. if you cant afford to run it on petrol dont bother with it.. they are a brilliant engine on single fuel petrol as was intended as are the 4.5s but they do not like gas at all

my mate has one on gas and he has never had a prob with it.. and its been on gas for around 3 years

oh i forgot to add im about to remove the head from one at work that has burnt valves from running on gas (with flashlube setup too) so ill take lots of pictures for you when the head is off..

A lot comes down to the quality of the gas system, the tune and maintenance. If you use an LPG system that can stay in a reasonable state of tune under various load and rpm situations, most don't, and adjust the valve shims every 50k kls you will get reasonable life from the head 150-200k klms much like the 4.5 petrol cruiser engine. The 4.5 TB45 Patrol engine is similar, tappets need doing every 20 k klms and the exhaust valve clearance should be opened due to the heat of lpg combustion causing additional expansion of the valve which results in the valve sitting off the seat for too long, overheating and valve and seat burning. I've seen the TB45 do 350k klms on the origional head if weel looked after.
Valve savers may help but the real issue is that LPG combustion temperatures soar under poor state of tune, rich or lean. Slightly advanced ignition timing will also help to reduve exhaust valve temps, this should be done with caution by a capable operator with a dyno and requires the use of premium fuel when on petrol.
Joel

My dads got one never had a problem with it. its running on strait petrol. I must say i love to drive it. The thing just goes.

Nissan Kid wrote:My dads got one never had a problem with it. its running on strait petrol. I must say i love to drive it. The thing just goes.

I don't get how running them on gas is going to make them any worse?

I can understand a dodgy install or lack of maintenance, but that isn't a specific issue with the gas.

The local dealer here was telling me that they have seen almost as many issues with the TD42 as the ZD30 in the GU's. One TD42 case was brought into the workshop with over 70,000km on it and never serviced or oil changed since new. That doesn't mean the TD42 is a crap engine.

Get a good injected system installed by a good mechanic and there is going to be no problem.

- David

vanbox wrote:

Nissan Kid wrote:My dads got one never had a problem with it. its running on strait petrol. I must say i love to drive it. The thing just goes.

must only use fuel from here

Dirty wrote:I don't get how running them on gas is going to make them any worse?

I can understand a dodgy install or lack of maintenance, but that isn't a specific issue with the gas.

The local dealer here was telling me that they have seen almost as many issues with the TD42 as the ZD30 in the GU's. One TD42 case was brought into the workshop with over 70,000km on it and never serviced or oil changed since new. That doesn't mean the TD42 is a crap engine.

Get a good injected system installed by a good mechanic and there is going to be no problem.

- David

mate nissan are oblivious to the zd30 having engine problems.. they just deny that they made a crap engine when something goes wrong..

Am interested in any feedback on this team

Have been thinking about upgrading the GU at the moment, and I'll be damned if I get a 3.0L, so that just leaves a 4.8 or do a Duramax converstion on a 3L

Saw a 4.8 in the Mitre 10 carpark today and found the owner, and he's loving it, upgraded from his 4.2 to it about 4 yrs ago (no gas) and loving the change.

He reckons he's getting about 18.5L/100, up to about 21-22L/100 if on the gas pedal On highway getting about 650-700ks per 120L tank - which is similar to my 4.2

Any thoughts??

What about these LPG-injection systems like used on the 200 series? More reliable and less prone to the valve burning??

O'wise, is it just better to put long range tanks in and bear it

as has been said many times over , if you can bear to feed it do it because they are a top motor and haul ass, however if your going to try and save with gas you may as well save for repairs too. they do not like gas at all

phippsey wrote:
He reckons he's getting about 18.5L/100, up to about 21-22L/100 if on the gas pedal On highway getting about 650-700ks per 120L tank - which is similar to my 4.2

I'm getting about 18ish around town if driving casualy. Yes the 22 is about right if enjoying the 4.8. Highway I get better than 18. Had got 14 when I bought it but mods changed all that.

rd28, zd30, tb45 and even td42 drivers all wish they could afford a 4.8.


simple really.

BowTieGQ wrote:

phippsey wrote:
He reckons he's getting about 18.5L/100, up to about 21-22L/100 if on the gas pedal On highway getting about 650-700ks per 120L tank - which is similar to my 4.2

I'm getting about 18ish around town if driving casualy. Yes the 22 is about right if enjoying the 4.8. Highway I get better than 18. Had got 14 when I bought it but mods changed all that.

You got a 4.8 still??

What about off road?? Have you got the auto??

Anyone know about these new series IV 5-speed autos only available in the 4.8s??

Good gearbox?? Haven't been impressed with the 3.0L auto - they seam to keep overheating under ++ load

I wanted an auto, anyone know how late they made 4.8 manuals? I'm guessing when the series IV came out they made it auto only in 4.8

phippsey wrote:

BowTieGQ wrote:

phippsey wrote:
He reckons he's getting about 18.5L/100, up to about 21-22L/100 if on the gas pedal On highway getting about 650-700ks per 120L tank - which is similar to my 4.2

I'm getting about 18ish around town if driving casualy. Yes the 22 is about right if enjoying the 4.8. Highway I get better than 18. Had got 14 when I bought it but mods changed all that.

You got a 4.8 still??

What about off road?? Have you got the auto??

Anyone know about these new series IV 5-speed autos only available in the 4.8s??

Good gearbox?? Haven't been impressed with the 3.0L auto - they seam to keep overheating under ++ load

I wanted an auto, anyone know how late they made 4.8 manuals? I'm guessing when the series IV came out they made it auto only in 4.8

2005 i think is the last year manuals were available.

The auto is a very different unit in the 4.8. Its the same auto mated to the VH series engines overseas (the V8s). Very good transmission.

Anyone know how thirsty off-road, or on the sand??

very , however the fun factor about tripples.

First post in this forum.

I have a GUIII 4.8 and have put gas injection on it. All I can say is it's awsome. I have lost no power, it has 151kw at the rears, and have had no problems so far. That being said I've only had gas on it for about 30,000 Km's. I also read about the problems and spoke to the bloke I know that runs Gas Research, I was informed that with the injection I should have no problems but if I went to an old type venturi system then I could suffer burnt valves. I was also lead to believe that the flash lube systems are not much use as the oil never makes it to where it should be on the valves.

on sand if playing they would have to be using 30L/ha ..........

Phipsey, 6.0 is the new 4.8. 20K conversions then sell old motor so 15 k you have more horses, more reliability, more resale and more economy................................ in my humbe but right opinion

I have a 4.8ltr patrol on gas, I love the power, everything is awesome, bar the fuel economy, basically there is NONE!!! On gas towing I expect to get less then 250km to a TANK of gas (aprox 85ltr) then I have a reseve of 38ltr petrol, lucky to get 130km towing. So all in all, friggin terrible fuel consumption.

Power is great, reliabillity is good if you have knowlagable guys working on your system, at the start of my gas set up I had problem after problem, to the point I told the guy to take the system out, He agreed and said if this last fix wont fix it, he will pull the F&$King system out, WELL, it still played up!!! I was in QLD at the time and took it to a guy here at Wedmaires Garage Riverview, they found that the wrong proceessor had been fitted, and gave me a quote to fix. I had it fixed 1k later) and I have not had a problem since, but the fuel economy is shocking!!!!! I wanted so much to send the bill to the other guy that fitted the system, but he done a very good cash price up front (hence the cheap gear) but all fixed now..

Anyway that is my thoughts. By the way, the car is lifted, bigger wheels, winch, diff locks, on board compressor, etc etc, so it is carring a little more weight than the standard patrol, but still, shit house fuel econ...

regards

Casey

Cheers

what about non-gas performance and fuel usage??

I just picked up a 4.8 and got 600km out of the 120ltrs

400 odd of those km's were on the highway.

Very thirsty but great to drive. This is in a patrol with 4 inch lift and 35's

I recently purchased a GUIII 4.8litre that I had converted to dual petrol/LPG.

Gas (injected) made ZILCH difference to the power output. BIG mumbo!

I knew it was a thirsty motor, so getting around 22l/100k (city/LPG) is roughly what I expected. The big difference is how much it costs to fill the tanks - 90litre LPG is usually less than $40 (in the city anyhow!), the 75litre aftermarket petrol tank is around $90 - $100 using only 98 octane petrol. Open road driving (on cruise control) brings consumption down to around 17-18l/100k (LPG). Obviously, I do most of my running around on LPG. Im trying for three LPG then one petrol (and so far succeeding).

I used to drive an 80 series Landcruiser 4.5litre petrol/LPG and it did slightly better fuel-wise, but the LPG wasnt injected and it would DIE on hills. Any offroading was done only on petrol. No such problems with the GU - the power is there when I need it. Cant wait to see how it does go on the sand - bugga the fuel economy! I didnt buy the GU to save myself money - I wanted something that would work - and work well.

CanberraMav wrote:I just picked up a 4.8 and got 600km out of the 120ltrs 400 odd of those km's were on the highway.

Very thirsty but great to drive. This is in a patrol with 4 inch lift and 35's

So approx 19/100, not too bad.

Cheers sas-sally99, yeah I'm not buying solely on fuel consumption, but it is a element I need to consider.

Good to hear about the gas injection, as I mentioned have heard a few good things, but want to find out as have been very dissapointed on previous gas systems on my Landys, but where not injected, so stalling on hills, blowing up air filter boxes, etc,etc

If the 4.8 averages 17-19/100 on the highway and 20-22/100 in town, that's fine on petty.

I just want to also have enough fuel range to simpson desert trips, etc approx 1000km range if poss

Do the 4.8s have the overheating problem like the 4.2s??

They have no problems. LPG has done a few heads I've heard. But that's all.

phippsey wrote:Do the 4.8s have the overheating problem like the 4.2s??

just pump a few dollars into the truck you got now, giving it a feshen up. spend 5k on the motor, new turbo and intercooler. and you will be loving it. rading to another usually results in a loss!

Also, if you wan to go travelling still, remember that LPG is harder to get....and wih the 4.8 economy, you may not get far!!

Has anyone done long distance remote touring in a 4.8?

Thought about it, remember I just did put a new turbo on last year

Lease it up soon on the truck, and I think I want to get a new one before this new shape one comes in which looks like it will have IFS front end and possibly no ladder chassis

It's not a power problem, just that the old girls getting a bit old and higher K's

LPG does scare me a bit, but if I had 80L LPG and approx 100L petty that about 900k range on 20L/100. Either that or just use straight petty with the extended tanks to 180L range therefore about 900-1000k