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agentmulder

Member Since: 16 Apr 2016
Location: Outer Space
Posts: 1324

Remap - can someone explain what it's all about?

Hello all,

So I'm new my Defender - and actually new to cars, let alone performance tuning.

It's a 2.4L Puma located in New Zealand - it began its life in the UK however (I'm 3rd owner).

Reading the forums here I see lots of comment about how vehicles have been:

> Remapped - "woohoo! more HP/torque! and fuel efficiency!"
> Had new intercoolers installed - that help engine performance in thier own regard, and may or may not be a necessity after a remap (according to who is talking)
> Had their EGR valves blanked - again, performance increase, but issues with warning lights and local MOT/emissions tests.

More torque and increased fuel efficiency sounds GREAT, even a no brainer if the cost of the modification will be less than the fuel spent within some time/kms you feel you're going to own your vehicle.

But there is a lot of conflicting/confusing info out there... Couple of Questions:

> What actually is a 'remap' anyway?

> I'm in New Zealand - what options (and associated complications, if any) do I have?

Ta in advance

Solved the bowel problem, working on the consonants...

6th May 2016 1:42am

PCA42

Member Since: 15 Jun 2014
Location: Church Stretton
Posts: 468

2008 Defender 110 Puma 2.4 DCPU Tonga Green

A remap can probably be explained in far more detail, especially by one of the experts who specialise in it on here, but essentially it is where the software on your Defender's ECU (Engine Control Unit); which is a small computer that manages all the vehicle's sensors, fuelling, turbo, driver inputs etc, is overwritten to optimise the engine's performance.

As standard, the manufacturer's map has to take into account all the different environments, fuel qualities, local legislations etc in the various different markets the vehicle is sold in. So it's more of a compromise map, rather than being optimised to get the best from it in the usual conditions.

Being in NZ, you may have a local agent that you could go to, to get it remapped. Otherwise you can also have it done remotely, which is offered by some of the sponsor companies on here; this is where you plug a module into your OBD plug and its connected by wizardry over the internet and computers to a clever person on the other side of the world!

As for intercoolers, I'd definitely recommend one if you are planning to go for a decent remap, as it will help get the best from it and reliably (keeping engine temps down). Pete

2010 Discovery 4 GS TDV6
1972 Series III 88" 2.25P

6th May 2016 12:26pm

7heaven

Member Since: 03 Feb 2016
Location: Oxfordshire
Posts: 122

2015 Defender 90 Puma 2.2 CSW Corris Grey

Intercoolers are used to cool the intake air, as cooler air is denser air. This allows more fuel to be injected whilst keeping the air fuel ratio at the desired level. More fuel means more power!

Intercoolers are particularly important in turbocharged engines, as the intake air is actually recirculated (via the turbo) from the engine cylinders, so is very hot. 2020 110 D200 Base - Pangea with satin paint protection
2015 90 XS Station Wagon (sold)
2010 110 XS Station Wagon (stolen)

6th May 2016 1:11pm

gilarion

Member Since: 05 Dec 2013
Location: Wales
Posts: 5111

2007 Defender 90 Other CSW Trident Green

As 7heaven says an Intercooler does what it says it cools the air before it enters the cylinders. As cooler air has a higher oxygen content then this result in a better burn of fuel.

‘As the air is compressed by a turbo/supercharger it gets very hot, very quickly. As its temperature climbs, its oxygen content (density) drops, so by cooling the air, an intercooler allows denser, more oxygen rich air to the engine, allowing more fuel to be burned, thus improving combustion and giving more power’.
For those who like Welsh Mountains and narrow boats have a look at my videos and photos at..

http://www.youtube.com/user/conwy1

6th May 2016 1:20pm

lohr500

Member Since: 14 Sep 2014
Location: Skipton
Posts: 1321

2013 Defender 110 Puma 2.2 XS CSW Santorini Black

7heaven wrote:

Intercoolers are particularly important in turbocharged engines, as the intake air is actually recirculated (via the turbo) from the engine cylinders, so is very hot.

Agree that the compressed air from the turbo will be hot due to compression, but there is no recirculation of the intake air from the engine cylinders in a turbo system. The hot exhaust from the cylinders passes through one side of the turbo and down the exhaust pipe, spinning the exhaust vane in the turbo that is linked by a shaft to the compressor vane on the inlet side of the turbo. The only time anything gets recirculated from the cylinders is when the EGR valve opens to allow a small amount of very hot exhaust gas to flow back to the inlet manifold to "aid" with emissions control. If I remember correctly, the EGR feed back into the engine is after the intercooler.

6th May 2016 7:49pm

7heaven

Member Since: 03 Feb 2016
Location: Oxfordshire
Posts: 122

D'oh! You're absolutely right! The heat comes from the compression of the air in the turbocharger

2020 110 D200 Base - Pangea with satin paint protection
2015 90 XS Station Wagon (sold)
2010 110 XS Station Wagon (stolen)

6th May 2016 7:57pm

integrale

Member Since: 29 Oct 2015
Location: Auckland
Posts: 77

If you're in/near Auckland I recommend Stag 4x4. They've looked after my Land Rovers for 25 years and are just a great group of knowledgeable enthusiasts. Have done the EGR, ECU upgrades etc, etc on my Td5 and Tdci Defenders, as well as work on my past V8 90, RRC, '49 S1, Freelander and D2. Very satisfied by their work and it's always a pleasure visiting them.

6th May 2016 10:26pm

gilarion

Member Since: 05 Dec 2013
Location: Wales
Posts: 5111

lohr500 wrote:
7heaven wrote:

Intercoolers are particularly important in turbocharged engines, as the intake air is actually recirculated (via the turbo) from the engine cylinders, so is very hot.

Agree that the compressed air from the turbo will be hot due to compression, but there is no recirculation of the intake air from the engine cylinders in a turbo system. The hot exhaust from the cylinders passes through one side of the turbo and down the exhaust pipe, spinning the exhaust vane in the turbo that is linked by a shaft to the compressor vane on the inlet side of the turbo. The only time anything gets recirculated from the cylinders is when the EGR valve opens to allow a small amount of very hot exhaust gas to flow back to the inlet manifold to "aid" with emissions control. If I remember correctly, the EGR feed back into the engine is after the intercooler.

You are right, but how does that work on 200Tdi engines that does not have a EGR valve but an intercooler somehow manages to increase the engine (horse power)? For those who like Welsh Mountains and narrow boats have a look at my videos and photos at..

http://www.youtube.com/user/conwy1

6th May 2016 11:07pm

LoveTheMud

Member Since: 19 Feb 2015
Location: Weybridge Surrey & Pontefract West Yorkshire
Posts: 411

2014 Defender 90 Puma 2.2 XS CSW Santorini Black

This may seem like a completely stupid question but, the only reason I haven't had a remap done yet is my LR warranty... Can you simply unbolt the ECU and disconnect it, buy a new one and change them over when service / warranty time comes up? Would LR be able to tell?

6th May 2016 11:12pm

tuesdayfox

Member Since: 23 Jun 2013
Location: Sydney,OZ
Posts: 129

2013 Defender 110 Puma 2.2 SW Zambezi Silver

yes if yours is 2.2 one of the remap suppliers will be able to provide you one ecu for free (as least when I bought mine a year ago.

so basically you will have two ecu. one stock one tuned.
change back to stock ECU and you on your way to the dealer for warranty...

7th May 2016 1:34am

tuesdayfox

Member Since: 23 Jun 2013
Location: Sydney,OZ
Posts: 129

Re: Remap - can someone explain what it's all about?

so the engine in a defender is also used elsewhere, in a Ford Transit, Mazda BT50, Ford ranger, Ford modeo, etc..

just take the Mazda BT50 for example, the very same engine has a peak output of 110KW and 370NM in a Mazda, compared to 90kw and 350 Nm from a defender 2.2. So obviously Land rover detuned the engine for our safety and probably for less warranty claim just like what the power tool industry does nowadays...

in a nutshell, you can just image the remap as simply put in a ford ECU in the case of a defender....

btw I bought mine from pete at BAS. the unlocked ECU and the gadget were shipped to me. you might want to check that out.

agentmulder wrote:
Hello all,

So I'm new my Defender - and actually new to cars, let alone performance tuning.

It's a 2.4L Puma located in New Zealand - it began its life in the UK however (I'm 3rd owner).

Reading the forums here I see lots of comment about how vehicles have been:

> Remapped - "woohoo! more HP/torque! and fuel efficiency!"
> Had new intercoolers installed - that help engine performance in thier own regard, and may or may not be a necessity after a remap (according to who is talking)
> Had their EGR valves blanked - again, performance increase, but issues with warning lights and local MOT/emissions tests.

More torque and increased fuel efficiency sounds GREAT, even a no brainer if the cost of the modification will be less than the fuel spent within some time/kms you feel you're going to own your vehicle.

But there is a lot of conflicting/confusing info out there... Couple of Questions:

> What actually is a 'remap' anyway?

> I'm in New Zealand - what options (and associated complications, if any) do I have?

Ta in advance

7th May 2016 1:42am

lohr500

Member Since: 14 Sep 2014
Location: Skipton
Posts: 1321

gilarion wrote:

You are right, but how does that work on 200Tdi engines that does not have a EGR valve but an intercooler somehow manages to increase the engine (horse power)?

Hi gilaion. Intercoolers have been around for a long time. Way before EGR valves.

There's a reasonable explanation here of what the intercooler does :

http://www.turbosmart.com.au/technical-art...ler-works/

It is basically cooling down the air after it has been compressed by the turbo which allows a greater density of oxygen in the air. The more oxygen you can get in the combustion process in the cylinders, the more fuel you can inject without causing overfuelling and black smoke. Getting more fuel at the correct fuel/air ratio in the engine per compression stroke gives more power. Reading other articles, it also seems that if you allow air that is too hot into the combustion process, then this can cause early detonation of the fuel/air mix that causes engine damage.

7th May 2016 6:52am

agentmulder

Member Since: 16 Apr 2016
Location: Outer Space
Posts: 1324

integrale wrote:
If you're in/near Auckland I recommend Stag 4x4. They've looked after my Land Rovers for 25 years and are just a great group of knowledgeable enthusiasts. Have done the EGR, ECU upgrades etc, etc on my Td5 and Tdci Defenders, as well as work on my past V8 90, RRC, '49 S1, Freelander and D2. Very satisfied by their work and it's always a pleasure visiting them.

Hey yeah thanks, i found them after posting this, good to have a testimonial.

Contacted via online form, will ring on Monday...

(Businesses never reply to those forms huh?!) Solved the bowel problem, working on the consonants...

7th May 2016 8:43pm

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