Ad Blue bypass

landmannnn said:

It is a trade off between EGR valve and adblue.
You can have an aggressive EGR and less adblue. Or you can have a light touch EGR and high adblue. And of course a range in-between.

IA have chosen a light touch EGR and high adblue. That is good, we don't want all that soot going through the engine.

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Not sure this is accurate, the EGR and AdBlue address 2 different issues.

alexandruast said:

On the left hand side, in the rear wheel arch, is the SCR module. Unplug the two connectors and see what happens. Running mine unplugged, as a test, since yesterday. Nothing unusual so far.
It might be an Easter egg hidden by the tech team, in case of emergencies. I bumped on it while installing a diesel heater.
View attachment 7861587

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Is this still working? I’d love some feedback…

AnD3rew said:

Not sure this is accurate, the EGR and AdBlue address 2 different issues.

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EGR is used to introduce an inert gas into the combustion chamber to reduce NOx by reducing combustion temperature, and this also includes the retarding of the injection timing to reduce NOx. Adblue, DEF or it's industrial name Aquious Urea Solution 32% AUS32 is injected into the exhaust stream within a SCR selective catalytic reduction device and has a reaction with heat and the materials in the SCR to reduce NOx. Most engine manufacurers use EGR and SCR together to reduce Adblue usage. However EGR can be eliminated, the injection timing advanced and the engine cooling system has less heat load only using SCR and considerably more Adblue to control NOx.

Fab said:

Does anyone know what will happen if you use water instead of adblue, in case of emergency?
AdBlue consists of 2/3 demineralised water anyway.

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The adblue tank checks the density of the adblue so if you water it down it comes up with a fault

I am rather ignorant about diesels except they seem like a pain in the ass and the fuel is more expensive than petrol. Why the hell would you even buy a diesel when you have a choice?

SkiBum1 said:

I am rather ignorant about diesels except they seem like a pain in the ass and the fuel is more expensive than petrol. Why the hell would you even buy a diesel when you have a choice?

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a) Torque, especially if towing a lot,
b) the fuel in the UK is only marginally more expensive on percentage terms of the cost per litre, (3%)
c) up to twice the fuel consumption economy of petrol, especially when towing heavy loads.
When driving solo on major/minor roads (eg non motorway) I frequently get 28mpg (UK gallon)

SkiBum1 said:

I am rather ignorant about diesels except they seem like a pain in the ass and the fuel is more expensive than petrol. Why the hell would you even buy a diesel when you have a choice?

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Modern diesels are pretty refined, not like the old donkeys of yesteryear. As Eric said fuel economy is way better and far outweighs any increase in cost at the pump. I drove the petrol grenadier to the south of France while I was waiting for my diesel to get the paperwork sorted. I have done over 2000 miles in the petrol. I like the diesel better. Unless you are driving it like you stole it you can’t really feel the extra hp of the petrol. The torque of the diesel is so much better, especially when towing. The petrol will kick down to 7th or even 6th gear where the diesel would still be in 8th. The diesel has a stronger gearbox too.

Some maths for you.
I have done 24000 miles in my diesel, average economy 24mpg thats 1000gallons, 4540 litres. Average diesel cost £1.50/l =£6810 spent in fuel.
24000 miles in the petrol. Average economy (and I’m being generous here) 20mpg, 1200 gallons, 5448l. Petrol cost £1.40 = £7627

In my experience the petrol actually returned 18-19mpg. And that wasn’t towing… The savings are pretty big and add up fast,

Tom D said:

Modern diesels are pretty refined, not like the old donkeys of yesteryear. As Eric said fuel economy is way better and far outweighs any increase in cost at the pump. I drove the petrol grenadier to the south of France while I was waiting for my diesel to get the paperwork sorted. I have done over 2000 miles in the petrol. I like the diesel better. Unless you are driving it like you stole it you can’t really feel the extra hp of the petrol. The torque of the diesel is so much better, especially when towing. The petrol will kick down to 7th or even 6th gear where the diesel would still be in 8th. The diesel has a stronger gearbox too.

Some maths for you.
I have done 24000 miles in my diesel, average economy 24mpg thats 1000gallons, 4540 litres. Average diesel cost £1.50/l =£6810 spent in fuel.
24000 miles in the petrol. Average economy (and I’m being generous here) 20mpg, 1200 gallons, 5448l. Petrol cost £1.40 = £7627

In my experience the petrol actually returned 18-19mpg. And that wasn’t towing… The savings are pretty big and add up fast,

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That would be in normal gallons not US gallons

Tom D said:

Modern diesels are pretty refined, not like the old donkeys of yesteryear. As Eric said fuel economy is way better and far outweighs any increase in cost at the pump. I drove the petrol grenadier to the south of France while I was waiting for my diesel to get the paperwork sorted. I have done over 2000 miles in the petrol. I like the diesel better. Unless you are driving it like you stole it you can’t really feel the extra hp of the petrol. The torque of the diesel is so much better, especially when towing. The petrol will kick down to 7th or even 6th gear where the diesel would still be in 8th. The diesel has a stronger gearbox too.

Some maths for you.
I have done 24000 miles in my diesel, average economy 24mpg thats 1000gallons, 4540 litres. Average diesel cost £1.50/l =£6810 spent in fuel.
24000 miles in the petrol. Average economy (and I’m being generous here) 20mpg, 1200 gallons, 5448l. Petrol cost £1.40 = £7627

In my experience the petrol actually returned 18-19mpg. And that wasn’t towing… The savings are pretty big and add up fast,

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Interesting long term fuel numbers. I've just passed 11200km or approx 6,900 miles in my diesel Trialmaster. I've kept accurate records of fuel consumption and the average of fuel used over total distance is 11.71L/100km which equates to 24.1 mpg (imperial). Consistency!

SkiBum1 said:

I am rather ignorant about diesels except they seem like a pain in the ass and the fuel is more expensive than petrol. Why the hell would you even buy a diesel when you have a choice?

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Ah ! Therein lies the critical question! That rationale for your choice is all important.
If you intend to use the Grenadier as a daily driver and you live in the land of "gas stations" on almost every corner and the marvellous US interstate highway system, then a petrol version with highway biased tyres/tires would be an ideal choice. Over 100,000 miles you would be well in front in terms of total maintenance costs compared to a diesel with A/T tyres/tires.

A friend who was a long time Toyota dealer used actively encourage 'soccer Mum' customers to purchase the petrol V8 LandCruiser 200 instead of the diesel, because he had the service data from several hundred 'Cruisers over a period of almost 10 yrs which he analysed and the results were unequivocal: at the 150k km mark petrol owners were up to $10k in front in total outgoings for fuel, servicing and spare parts.

However, for "grey nomads" towing caravans to the Australian outback, farmers on large properties, mining industry types etc, the diesel version was a 'no-brainer'. Far better economy towing, diesel fuel is generally safer to carry in jerry cans than petrol etc and fuel stations are relatively scarce in far flung places compared to other countries. On diesel costs v petrol: in Australia at least, the price of diesel is relatively stable compared to petrol which can vary by up to A$0.60c per litre from one day to the next depending on the international spot price, the competition in metropolitan areas and a fluctuating exchange rate....
As the wise man says "tread your own path"

DenisM said:

Interesting long term fuel numbers. I've just passed 11200km or approx 6,900 miles in my diesel Trial master. I've kept accurate records of fuel consumption and the average of fuel used over total distance is 11.71L/100km which equates to 24.1 mpg (imperial). Consistency!

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Very consistent @DenisM.
My figures (diesel).
11.59 l/100km average over 12 months.
Edit: That's 20.28 US mpg (conversion here)