Frequently Asked Questions about Just VW Audi Performance

ECU Remaps
Just VW Audi Tuning
Tunit

Milltek Exhausts

Suspension

Alloys



Q. What is re-mapping?
A. The most difficult concept to grasp for most people is that re-mapping is merely engine tuning, albeit that it's being done electronically rather than mechanically (as in the old days of carburetters and distributors). A chip is simply an electronic storage device which is located on a circuit board inside the E.C.U.(the Engine Control Unit). The chip contains values in a binary form which the E.C.U's main processor (another device on the same circuit board) can understand and use to control the engine.

Each value inside the chip is held in its own separate position (known as an 'address'), and when a car is re-mapped, what we are basically doing is altering the values at the groups of addresses that control fuelling, ignition timing and on turbo engines, turbo boost. These are known as maps, hence the often-used term 're-mapping'. It is these maps which we massage in order to tune the engine.

Q. How is it done?
A. The first job to do when a new E.C.U. type arrives at Just VW Audi Peformance is for the chip content to be read and stored on a PC. Then, using a combination of in-house software, in-depth experience of engine management software, and processor instruction sets the maps of interest are identified. Our engine analyser, serial data stream reader and a real-time in-circuit emulator are then used to rewrite the map contents to achieve the required results.

Q. Why re-map at all?
A. E.C.U's (Engine Control Units) were first introduced back in the 1980's as a supposedly more efficient method of controlling engine fuelling, ignition timing, and emissions. The problem lies in the fact that all new cars have to undergo 'Type Approval', and part of this is getting the car through the 'Urban Driving Cycle' tests. Remote from European driving conditions as they are (the tests are based on a simulated trip around Los Angeles with the resulting noxious gases collected in a bag for testing), car manufacturers had no option but to comply. In order to meet the stringent requirements, engines are virtually detuned to pass the test. As a result the car never performs as well as its mechanically controlled counterpart, with hesitancy and flat spots thrown in for good measure. This leaves masses of room for a creative engineer to re-tune for vastly improved performance, and without infringing any emissions regulations.

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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 engines safety limits will allow. We have never had to 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 have 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 acheived as a by product of extra exhaust gas flow.

Q. Will it make my vehicle smoke?
A. If your vehicle does not smoke to start with then no. If your vehicle does smoke to start with 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.

Q. Why do I need to adjust the Tunit?
A. The Tunit does not need adjustment in most cases as it 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 than what it should be 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 your Tunit to adjust?
A. It 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 or 6. 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 mod's, we can alter far more parameters with a lap-top tune (available at all our distributors) and we can alter the Tunit to your preference. ie bringing the power in further down the rev range or extending it to higher revs. Please contact a distributor for details.

Q. How do I know what power I have when I have adjusted the Tunit?
A. The only way to truly ascertain your power is with a rolling road dynamometer test. These are available at selected distributors. Please ensure for a list of these. There is no set rule for how much power is gained each time a Tunit is turned up. One vehicle will react differently to another.

Q. Do I need a rolling road test?
A. No, there is no need for setting up on a rolling road. However if you would like one for curiosity and if this is of interest then we would be happy to supply one.

Q. Why is the 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 fit 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 unit are fit in 5-10 minutes others take up to an hour, but once fit can be removed in less time . As an average most are fit 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 should I fit a performance K&N Filter ?
A. A K&N filter has up to a 30% better air flow rate and have million mile warranty. The filter generally compliments the performance of the Tunit and helps your fuel economy.

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 recommend insurance company.

Q. I like the idea of buying a Tunit but would like to try it out, is that possible? A. Actually, yes. If you are willing to travel to the premises of any of our distributors, we offer a 'try before you buy' policy where we fit the Tunit, take you for a test drive to make sure you are completely happy. If you don't want the Tunit for whatever reason we will remove it and charge the fitting fee. This way you can be sure about your purchase before you spend your money.

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 we 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. Our 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. Where can I get Tunit from
A. contact us via our contact form, telephone us on the number below or email us at the address below. We are happy to answer any questions you may have about the Tunit.

info@justvwaudiperformance.co.uk
0845 652 2 653

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Power Gains

Q. What sort of power gain can I expect to get?
A. Each car has it's own characteristics, and the power gain can vary greatly between them. 8-10% is about the most accurate general figure to cover all variations.

Sound Information

Q. I want a sporty sound, but not one that is so loud that it wakes the neighbours or annoy me on a long journey. What sort of sound do your systems produce?
A. As our slogan states, 'Performance to blow your mind, not your ears!' our engineers' mission is to find the perfect balance between maximum performance increase while maintaining a responsible noise level. We DO NOT produce boy-racer style exhaust systems that can be heard from miles away. Our systems are designed to appeal to enthusiasts of all levels and the main way of controlling this is by offering resonated and non-resonated versions of most of our systems - see below for further information about the differences between resonated and non-resonated).

Q. What is a resonator and what's the difference between a resonated and non-resonated exhaust system?
A. A resonator is a chamber in the exhaust system that contains a specific volume of air which is designed to cancel out certain frequencies of sound (made by the engine) - making the exhaust noise quieter.

Therefore, a non-resonated exhaust system will give you extra performance and a louder exhaust note and the resonated system will give you extra performance without increasing the exhaust noise much.

Legal Information

Q. Is it legal to de-cat my car?
A. De-catting a car in the UK registered after 1993 is illegal as it will fail an emissions check.

Q. What alternative do I have to a de-cat?
A. A Hi-Flow cat will increase flow by as much as 30% over the original manufacturers unit.

Purchasing

Q. Can I buy parts individually (e.g. can I buy just the cat, or just the downpipes or backbox)?
A. Hi-Flow cats are available as stand-alone purchases, otherwise units are sold as either cat back or rear box only, because Milltek are genuine performance systems you can't mix and match.

Fitting

Q. Will I need to modify my vehicle in order to fit Milltek products?
A. No. Our products are direct replacements for the original systems and come with everything needed to fit them. There are some vehicles that may require different rear valances to be fitted to allow tailpipes to exit the rear bumper (e.g. VW Golf Mk4) but this will be made clear to you.


Q. Does Just VW Audi Performance offer a fitting service?
A. Yes, all our Milltek exhaust prices include fitting by VAG trained technicians.

Aftersales Care

Q. Is my exhaust system covered by a guarantee or warranty?
A. As long as you are the original purchaser of the exhaust system, you are covered by a lifetime anti-corrosion and manufacturing defect warranty. We do not cover against any modifications made to our product after it has left our workshop and also not for unusual use of the parts - for example, the use of Nitrous Oxide (NOS), damage caused by going over a speed bump too fast etc. We pride ourselves on our after-sales support and customer service and will look into each case on an individual basis.

All warranty cases should be dealt with by Just VW Audi Performance.

Cleaning Tips

Q. How do I clean my stainless steel tailpipes without scratching or damaging them?
A. It is important to note that if you don't clean your tailpipes regularly (and we know that some of you don't :) ), they will suffer from discolouration and become harder to clean. Because of the high-quality stainless steel, you will always be able to get them back to looking brand new (without any degradation in the materials), but the longer you've left it without cleaning them, the harder it will be!

Milltek tailpipes are made from the highest quality polished stainless steel, we have found that the best way to clean them is to use a Silver Polish. The actual specific product we use is called Silvo Silver Polish with Wadding. It's important to get the one with the wadding inside as it's really good at getting it clean. Clean the bulk of the soot off the surface with an old rag first and then use the polish/wadding to get your tailpipe(s) sparkling again.

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