Tunit Diesel Performance Tuning for Land Rover Discovery                                

* Special Offer       

Free Autoglym Valeting Kit containing:
1 x 325ml Bodywork Shampoo Conditioner  
1 x 325ml Super Resin Polish
1 x 325ml Glass Cleaner
1 x Large Sponge       
1 x Cloth 
with every Tunit purchased.

The Tunit

offers the following performance increases.

Land Rover Discovery III 2.7 V6 190bhp (2005)
Increases bhp from 190bhp to 220bhp
Increases torque from 326lbft to 363lbft

Land Rover Discovery III 2.7 V6 Euro IV 190bhp (2007)
Increases bhp from 190bhp to 220bhp
Increases torque from 326lbft to 363lbft

Land Rover Discovery TD5 137bhp
Increases bhp from 137bhp to 160bhp
Increases torque from 222lbft to 259lbft

Land Rover Discovery TDi (Auto Only) 97bhp
Increases bhp from 97bhp to 120bhp
Increases torque from 156lbft to 181lbft

What is a Tunit?
The Tunit is a plug and play performance product suitable for all modern diesel engines. Tunit is designed to improve power, torque and efficiency, without compromising fuel economy. In most cases applications will achieve a 7-10% saving on fuel. It will not interfere with original equipment or the manufacturers warranties. Thanks to Tunit, diesel tuning its possible to increase the performance of all modern diesel vehicles by up to 30%.

How it Works
All Tunits are specifically designed to achieve enhanced diesel performance by modifying the fuel injection parameters and only by the careful interplay of these values and characteristics can the optimum performance of your engine be achieved. The turbo boost pressure is not directly altered (on turbo models) by the Tunit and is only increased via the natural increase in exhaust gases provided by the increased performance.

Installation
In most instances the Tunit comes complete with the original manufacturers plugs and connections. An original quality harness to fit in-line is also provided. Most Tunits are fitted in 10-20 minutes and all are designed to be easily installed by someone of average mechanical capability. If you prefer, we can fit the Tunit for you. If you need to remove the Tunit for either fitting on another vehicle or for any other reason it is just as easy.

Adjustable Tuning
The Tunit V-CR, V-PD and V-VP models come pre set for the vehicle. Each Tunit has a 9 position rotary switch. Each position will provide a different power level. 1 is the lowest, 9 is the highest.

What is achieved?
Instantly the increased power and torque can be felt. The throttle response is improved and particularly low and mid range torque is vastly improved, making the overall performance of the vehicle completely different.
When carrying loads and/or towing, the extra power is a also great advantage. The overall drive becomes more pleasurable and the engine in most instances runs smoother.
In independent tests and trials, results of 7-10% improvements in fuel economy have been achieved. This obviously varies from vehicle to vehicle and application.

Warranty & Guarantee
The Tunit and its components come with a full 3 year warranty. This is transferable with the customer to another vehicle. The warranty can be transferred to a separate customer by applying to Tunit with the original owners cutomer details.

After sales
Every Tunit customer has the full backup and service from Tunit whilst they own a Tunit product

Questions about Tunit products

Q. Why is the Tunit better than a EPROM replacement chip or "flashing"/ serial port retuning.
A. This is our most commonly asked question, and there is more than one reason why the tunit is a preferable solution.
The tunit can be fitted in most cases in under 30 minutes (some 10 minutes). Installation of a EPROM replacement chip can take up to half a day and sometimes more. Flashing as it is commonly referred to, or reprogramming the manufacturer's ECU through the OBD serial port is usually quite quick however it has its limitations as explained below.
The tunit can be transferred from one vehicle to the next. Alternatively it can be exchanged via our 2 year part exchange scheme or simply sold second hand once the vehicle is disposed of. Either way you save money. You would not have any of these options with a EPROM chip or flash reprogram. Both would have to stay with the vehicle when you disposed of it.
The tunit has the facility to be adjusted unlike any EPROM replacement or flashing. This means that the tunit can be adjusted to the optimum setting for each and every individual vehicle. For example a 90 bhp engine can actually vary in standard from 80-100 bhp. This means that if an EPROM reprogram or flash reprogram suited to a standard 90bhp is used on a engine producing 100 bhp then this will cause running problems (possibly smoke too). If the same method is used on an engine producing 80 bhp then this will improve the performance but only marginally. With the tunit it does not matter if a vehicle is under performing or over performing to begin with. The manual adjustment will compensate for this and make sure you achieve optimum performance for each and every individual vehicle. This adjustment is achieved by a 9 position switch on the rear of every tunit. For even more adjustment options an authorized Tunit distributor can also reprogram the tunit via a laptop to compliment the addition of other performance aids such as exhausts and intercoolers or to help with specific driving conditions such as towing or heavy loads.


Q. Can the Tunit put any strain on my engine or damage my engine?
A. The tunit is designed and programmed in each case to improve your performance no more than the engine's safety limits will allow. We have never had an incident to date where the tunit has been responsible for any engine or engine related problem. The longevity of an engine is determined by how it is looked after and driven. The tunit is installed on many high mileage vehicles and has been running on them for 5 years and more. The tunit is programmed carefully so as not increase strain on the engine and any of its components such as turbo and injection equipment. Turbo boost pressure is not directly altered but a gain in boost is achieved as a by-product of extra exhaust gas flow. The Tunit now comes with a 1 Year Engine and Driveline warranty for your peace of mind (subject to conditions-please see www.tunit.com/warranty)

Q. What if I want more power and torque?
A. More power can usually be given and this can be done one of two ways.
1. Using the manual adjustment on the tunit following your instruction manual.
2. Laptop tuning can improve performance and this is a special service provided by formula4. The service can help you improve performance for your specific application i.e. if you happen to tow heavy loads or drive on rough terrain. If you happen to add other performance aids such as more efficient intercoolers and injectors, then the tunit can again be reprogrammed to suit your modification.

Q. Will my vehicle smoke?
A. If your vehicle does not smoke to start with then no. If your vehicle does already smoke then in many cases the tunit can clean up your vehicle emissions. This can happen because the programming works to increase the efficiency of the injection equipment. If you are not sure if your smoke emissions are normal then ask one of our tuning experts.

Q. Will my vehicle run badly or be noisy ?
A.No. Most diesel engines will run more smoothly and more quietly when the tunit is installed as a result of more efficient tuning of the injection system.

Q. Why do I need to adjust the tunit ?
A. The tunit does not need adjustment in most cases as each part number comes pre-programmed to your individual vehicle. However the ability to adjust the tunit is invaluable if your vehicle power output in standard is different to what it should be. If this is the case then the tunit can be adjusted up and down to reach your optimum setting. This is something a fixed map device could not do.

Q. How easy is the tunit to adjust?
A. The tunit is very easy to adjust. Each tunit has a 9 position dial that is reached by a clear plastic removable cover. The dial will always come set at 5. You may turn the dial up or down to achieve better power or fuel economy. The tunits II, III & IV are adjustable in a similar way but work with a screw with no fixed positions.
If you have a specific application you need to adjust for, such as towing or using the tunit in conjunction with further engine modifications, we can alter far more parameters with a laptop tune (available from formula4), and tailor the tunit to your preference, i.e. bringing the power in further down the rev range or extending it to higher revs. Please contact us for details.

Q. Why is your Tunit better than other similar products I have seen ?
A. The Tunit is born out of much research and hard work. It has been developed by some of the top minds in Europe today. It is more compact than most, It has adjustable tuning that most do not. It works by altering parameters pro-rata, not just turbo boost or fuel quantity as some methods of tuning may use. Our methods and designs are followed by many other companies in attempts to emulate them. Our aim is to always bring any advancement to our customers as quickly as possible, so you can be assured what you receive is always the latest technology. No rolling road set up is required. We offer a 3 year warranty and part exchange facility. Our customer service is excellent ! We promote good service and customer relations as a priority through our distributor net work. What ever the problem may be we will try our best to help.

Q. Why don't the manufacturers do this ?
A. The answer is down to cost. The Tunit works to individually optimize each vehicle and engine. Every engine has different characteristics. When the manufacture receives the engine management software for a new production car, the components are bulk programmed in batches to a given tolerance and not prepared to each individual car, treating each car to an optimum and individual adjustment would increase production costs and time for the manufacturer.

Q. Will the Tunit null and void my vehicle warranty ?
A. No it can't possibly, it only affects your engine. It is often thought that if a modification such as this is fitted the warranty is then void. This is no more true than any other modification. The Tunit is retro fit and does not interfere with the original equipment of the vehicle. If a failure was to happen on your vehicle the Tunit can become an arguable point, in the event of a warranty claim, like any retro installed part not standard on a vehicle. To our knowledge to date, the Tunit has not been responsible for any engine or engine related failures.

Q. How long does the Tunit take to fit ?
A. It does vary from vehicle to vehicle. Some units are fitted in 5-10 minutes others take up to an hour, but once fitted can be removed in less time.  As an average most are fitted within 30 minutes.

Q. Is there a warranty on the Tunit ?
A. Yes, the Tunit including all components has a three year warranty.

Q. Does the Tunit need any maintenance.?
A. None at all.

Q. Why will giving my vehicle more power achieve better fuel results?
A. The Tunit provides more torque through the engine particularly in the low to mid range. This allows the driver to change gear more quickly even with an automatic so as a higher gear is achieved giving better fuel economy. Granted you will have to do some miles to pay for the unit but you will have some fun getting there.

Q. Should I tell my insurance company ?
A. You should always tell your insurance company of any modification. If you have a problem with your insurance please contact us and we can help with a recommended insurance company.

Q. What if I have difficulty fitting the Tunit ?
A. If you require any help at all either during fitting or even later down the line Tunit have a free technical help line and a full after sales back up service to help you out.

Q. Will I achieve the figures that are published ?
A. The published figures are generally conservative so as even the under performing or tired vehicles still achieve these figures and every body is happy. So yes.

Q. What is common rail.
A. Common rail is one of the latest forms of delivering high pressure fuel into a diesel engine economically. Most manufacturers have their own system, hence different units are required for different vehicles.

Q. What is PD. ?
A. PD VW / Audis own new injection system. It stands for Pump deuse or single unit injection. It has proved to date a very efficient method of fuel delivery. Landrover also use this system in their TD5.

Mitsubishi L200 animal
Immediately saw a fuel efficiency increase of 4mpg. I have not changed way I drive and now I have much more acceleration under my right foot - comes in handy. I now will not be selling my vehicle for another year as its like having a new truck!

Tony Beardwood, Warrick


Mitsubishi L200 DCi Warrior
I would just like to thank and compliment you and Tunit on your service and promt response to all the questions I had ... upon reciveving your product I had it fitted immediatly and was ovewhelmed with the performance increase having allready had the mitubishi power upgrade your product made the vehicle drive better than I could have imagined ... I have and will continue to sing your praises .. and promote the sales of the Tunit product here on the sunny island of Cyprus.

Adrian Forbes, Cyprus

 
Mitsubishi Shogun Sport
My vehicle was a sluggish mover but with the tunit fitted its a lot more nimble

David Taffinder, Wakefield


Nissan Navara 2.5 dCI D40
Just to say thanks, fitted my chip last week to my Navara D40 and after trying others I am well impressed. Got it set on number 7 running fine so far, small hiccup when set on number 8 but torque is amazing. Will have to see how good fuel econ is when I start driving sensible again but I can't help putting my foot down at the moment.

Richard Rimmington, Hull

 
Nissan Navara 2.5 dCI D40
I need a large vehicle to transport me and my heavy shooting kit to competitions all over Europe. With fuel costs the way they are, economy on a day to day basis will always be a problem. But my Navara always does in excess of 30mpg with the Tunit fitted. The more I travel, the more I save. I once followed a Porsche Caynne for several miles in Germany on the autobahn. He slowed down at his exit to have a look at what had kept pace with him! So no complaints about performance either.

John Emmerson, Wakefield


 
Nissan X-Trail 2.2 DCi
Hi Dan. Did a trip to London last weekend and drove sensibly, when I hit 350 miles where the light would normally come on, I had a quarter of a tank left. I went on to 401miles before the light came on. Great job, still got the power low down and over the moon at the economy. Thanks very much. Cheers, Mike Gregg

Mike Gregg, Preston

 
Nissan X-Trail 2.2 DITD
I have fitted the unit onto the X-Trail, it took about 5 minutes, it is now like a different car! I’m currently experimenting with the different settings but the car runs great on the standard setting. What I’m most impressed with is the change to the smoothness when accelerating, instead of the jerky delayed response the car now responds as soon as your foot touches the pedal. The torque increase is great and the power, in terms of smooth accelerating is amazing; I know it’s a 4x4 but it feels like a car when driven. The investment is well worth it given the scale of change to the performance; I’m sure once I stop taking advantage of the keen acceleration that I’ll start saving money on fuel but at the moment I can’t resist the temptation to floor it!

David Hayward, Pontypool


BMW X5 3.0d
Great product. Easy to install. Works very well. Frees factory-limited engine.

Sixto Sune, Portugal


Isuzu Rodeo 3.0L
Very impressed. Noticeably improved acceleration and responsiveness as well as slightly better economy. Towing now much easier with heavy loads as well as being more fun to drive without. Well worth the money and much better value than paying manufacturer for same engine with higher power output.

Mike Sutherland, Aberdeenshire


Jeep Grand Cherokee 2.8 C
Has made a significant improvement in both mpg and performance. Has smoothed out auto gear shift, reduced turbo lag and no more plumes of black smoke when accelerating hard. Overall really impressed, considering buying one for the Wrangler as well.

Steve Palmer, Coalville


Land Rover Defender TD5
I run a Defender TD5 in Dubai, which is all city driving or desert sand driving. The Tunit has allowed me to be a boy racer around town and have enough umff to get up the bigger dune, neither of which was possible before the Tunit.

Martyn Roper, Dubai


Land Rover Discovery TD5
I tow a trailer weighing about 2 tonnes and also a caravan which weighs approx 1.5 tonnes and since fitting Tunit I find it performs better when overtaking and also climbing long drags on motorways and main roads

Peter Clark, Finedon


Land Rover Range Rover 2.5 D
Brilliant added some extra power to a much undepeforming engine! Really easy to fit too

Tim Kearny, Tipton


Land Rover Range Rover 3.6 V8
Noticeable increase in power and torque. Extra acceleration. Took mine to 110mph in what seemed like no time at all.

David Cotterill, GUERNSEY


Land Rover Range Rover Sport
The Sport was a different car once the tunit had been fitted,as soon as I left the Tunit premises I could feel the increased power and the acceleration was a lot smoother, completing the Cannonball 8000 run to Zagreb at high speed really showed the difference that the tunit made.

Derek Hunter, Preston


Mercedes Vito 120 CDI
Gives better response and when you get over the fun of having more power everywhere fuel economy is better and the powers there when needed

Mark Hillam, Watlington, Oxfordshire


Toyota Hilux
The Hilux is used to tow machinery and tools to and from jobs every day. These can be up to 30 miles away. A trailer is being towed nearly all the time with either a tonne or so of topsoil or hardcore or a mini-digger in. This is why the large torque gains where so beneficial to me and the company. This extra torque meant that the fully laden trailer could be pulled at far lower revs resulting in huge gains in fuel economy. The extra power when the trailer is taken off from the tunit still impresses me everytime.

Joe Ainscow, Bury


Toyota Hilux 2.5 D-4D
They are fantastic, easy to install, I like the ability to adjust the box if you want low down pulling power or top end speed, and it paid for itself within a couple of months what more can you ask for.

Alastair Moss, Buxton


Toyota Hilux 3.0 D-4D

Excellent performance, an instant noticable difference

Matthew Hewes, Chelmsford


Toyota Landcruiser HJ100 4.
Originally found Toyota sluggish and fuel economy not great. Towing greatly improved as did fuel economy and performance

John Spencer, Halifax

 
Toyota Rav 4 2.0 D-4D
Have been running Rav on setting number 8 for a while and fuel consumption on average about 5% better than standard but because the engine responds better I do tend to drive quicker than I should so don't save as much as I probably could. Torque much better because I can drive in higher gears at lower speeds than standard set up. Tows 2008 Swift Challenger 480 really easily without too much gear changing. Have recently moved the control to number 9 and so far seems to have improved performance and torque even more. I was talking to fellow tower with standard Rav 2.0 D4D and he was saying he was disappointed that he had to keep changing gear when towing due to lack of torque. I did give him your phone number. Very pleased with the system in general. Easy to fit except for the silly place Toyota put the fuel rail connector plug.

Colin Holmes, Hereford


VW Touareg 2.5
The tunit absolutley transforms the car. I was beginning to wish I had bought the 3 litre, but no need now. Brilliant service and product, I will spread the word. I think most people are sceptical of these things, but once tried you become an instant believer, and a very happy one at that. Regards

Haydn Lipscombe, Birkenhead, Merseyside