Tunit Frequently Asked Questions
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Categories :
Products: I want to know more about Tunit products
- » Why is the Tunit better than a EPROM replacement chip or "flashing"/ serial port retuning.
- » Can the Tunit put any strain on my engine or damage my engine?
- » What if I want more power ?
- » Will it make my vehicle smoke?
- » Will my vehicle run badly or be noisy ?
- » Why do I need to adjust the Tunit ?
- » How easy is your Tunit to adjust?
- » How do I know what power I have when I have adjusted the Tunit ?
- » Do I need a rolling road test?
- » Why is your Tunit better than other similar products I have seen ?
- » Why don't the manufacturers do this ?
- » Will the Tunit null and void my vehicle warranty ?
- » How long does the Tunit take to fit ?
- » Is there a warranty on the Tunit ?
- » Why should I fit a performance K&N Filter ?
- » Does the Tunit need any maintenance ?
- » Why will giving my vehicle more power achieve better fuel results?
- » Should I tell my insurance company ?
- » What if I have difficulty fitting the Tunit ?
- » Will I achieve the figures that are published ?
- » Where can I get the Tunit from
After sales: Warranty issues, Part Exchange and Upgrade Information
- » Who do I contact if I have any questions or I think I have a problem ?
- » I want to fit my old Tunit to my new vehicle, how do I know if I can do this ?
- » I wish to part exchange, can I and how much will I get for old Tunit ?
Trouble Shooting
Other: General Helpful Questions about Diesels, cars and related topics
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 and not there is more than one reason why the Tunit is a preferable solution. Answer as follows
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 manufacturers 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 of 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 a 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 also). 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?
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. What if I want more power ?
More power can usually be given and this should be done with the advice of a Tunit distributor. We can specifically reprogram many Tunits to give extra power. This is usually in conjunction with other performance aids we can provide such as more efficient intercoolers and injectors.
Q. Will it make my vehicle smoke?
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. Will my vehicle run badly or be noisy ?
No. Most diesel engines will run more smoothly and more quietly when the Tunit is installed as a result of more efficient running.
Q. Why do I need to adjust the Tunit ?
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?
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 ?
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?
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 your Tunit better than other similar products I have seen ?
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 ?
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 ?
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 ?
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 ?
Yes, the Tunit including all components has a three year warranty.
Q. Does the Tunit need any maintenance.?
None at all.
Q. Why should I fit a performance K&N Filter ?
A K&N filter has up to a 30% better air flow rate and have million mile warranty. The Tunit generally compliments the performance of the Tunit and helps your fuel economy.
Q. Why will giving my vehicle more power achieve better fuel results?
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 ?
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. What if I have difficulty fitting the Tunit ?
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 ?
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.
contact us or any Tunit distributor via our contact form, order from our website(s) telephone us on the number below or email us at the address below. We are happy to answer any questions you may have about our product.
After sales - After sales: Warranty issues, Part Exchange and Upgrade Information
Q. Who do I contact if I have any questions or I think I have a problem ?
A. You should always contact the distributor you purchased the Tunit from. They are always in the best position to help you out.
Q. I have changed my vehicle and want to fit the Tunit to my new vehicle, how do I know if I can do this ?
A. If the Tunit is not the same type, i.e. VP, CR or PD then it will not fit and you should contact your local distributor to see if a part exchange is available. If your Tunit is the same then you should check with your local distributor also before attempting to install. The Tunit may look the same but in many cases the harness and the program will be different.
Q. I wish to part exchange, can I and how much will I get for old Tunit ?
A. You should contact your closest distributor and they will offer you the best deal possible.
Other Questions
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.
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.
