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on May 17, 2014 in product featured, Products |


The MAPECU has two main functions.  Firstly it allows you to remove the stock (and sometimes very restrictive) Air Flow DSCN0229Meter (Flap, Hot Wire and the tricky Karmen Vortex frequency types) and convert your existing ECU to MAP load sensing (up to +30 PSI).  Secondly, and just as importantly, it allows you to completely re-map fuel delivery with a 486 point table.  This allows the stock ECU to handle injector and other upgrades with ease.  The MAPECU is configured and tuned Real-Time using a custom developed PC application.  Substantial power gains have been realised without sacrificing the driveability the stock ECU provides.


  • More power due to improved breathing and through tuning of Air/Fuel ratios.
  • The ability to cope with performance upgrades such as larger injectors while retaining the stock ECU.
  • High-resolution 486 point table allows fine tuning of performance and driveability.
  • Real-Time tuning using a PC based Windows™ application supplied with the unit.
  • A built-in manifold pressure sensor capable of reading up to +30 PSI.
  • Retains the driveability of the stock ECU usually sacrificed with a full after market ECU upgrade.
  • Simple piggy-back installation, no major re-wiring

The MAPECU has been superseded by MAPECU3.


Q. Which cars will the MAPECU work in?

A. Most late model cars with microprocessor based ECU’s.  You can usually tell if the current Air Flow Meter and sensors run off 5 Volts.  Some older non-microprocessor based systems run off 12 Volts and are not compatible.

Q. What type of Air Flow Meter will it replace?

A. Just about any 5 Volt Flap, Hot-Wire or Karmen Vortex Frequency based units.  This covers about 80% of the various cars in the market.

Q. Is there a different model for Voltage or Frequency based Air Flow Meters (AFM)?

A. No.  There is only one unit but there are different wires in the loom for different installations.  Configuration of Voltage versus Frequency is via the PC based application.

Q. What about a car that is MAP based already, can I use the MAPECU with one of those?

A. Yes, you can.  If your car already runs MAP, you can use the MAPECU and gain full control over your fuel delivery but the installation may not be as straight forward if the MAP sensor if mounted inside your stock ECU.  Talk to us about the details.

Q. Why should I install a MAPECU instead of a full after market ECU?

A. Good question.  The MAPECU is designed for 80% of the people out there who bolt on performance modifications and don’t need to swap the stock ECU.  The stock ECU in most cars is the best ECU for a road car.  You can’t beat the driveability and functionality of a stock ECU unless you spend a lot of money on a top of the line after market ECU and the all-important tuning.  The biggest problem most people come up against is not being able to change fuel delivery if they install bigger injectors.  Usually you have to get a bigger Air Flow Meter that is compatible (not always possible) or somehow modify the existing AFM, which is not usually successful.  The MAPECU allows complete control of the AFM signal to the stock ECU so you can tune fuel delivery at any load point.  You can also remove the stock AFM completely eliminating the restriction.

Q. Can I install the MAPECU myself, there are only a few simple connections?

A. No.  The MAPECU can only be installed by a professional performance tuning specialist authorised by Performance Motor Research.  Because the MAPECU has complete control over fuel delivery to your engine, you can completely destroy it in a matter of seconds if it is tuned incorrectly.

Q. How do you get a performance upgrade with the MAPECU?

A. Two ways:  Firstly you remove the AFM, which can be a restriction, especially if you have increased boost, etc.  Secondly you are able to tune the Air/Fuel ratios for your engine.  The tables in most stock ECU’s are compromises for the variations in thousands of production cars.  This means it is not tuned for your engine, especially if you have made changes around the engine for performance.  Most stock tables are also very rich to prove a safety margin for the manufacturer against warranty claims.  The MAPECU allows you to tune the Air/Fuel ratio for optimum performance for your engine.

Q. What kind of performance gain can I expect with a MAPECU?

A. That depends on your engine, it’s condition and what modifications, if any, you have made.  A Toyota 3S-GTE gained 30kW’s at the wheels in a back-to-back dyno run comparing the stock AFM with a tuned MAPECU configuration, with no change in boost.

Q. Will the MAPECU work on non-turbo cars?

A. Yes, it will.  There is no reason why you cannot install a MAPECU in a naturally aspirated car so you can remove the AFM and gain complete control over fuel delivery.  In fact, you can order the unit with expanded vacuum sites in the table especially for NA engines to improve tuneability.

Q. What is required to tune a MAPECU?

A. Because the MAPECU is like getting access to the fuel table in your stock ECU, there are 486 entries in the table to be filled in, but we don’t have access to the stock ECU information to help us.  There are some features built-in to the unit to help with tuning.  Firstly there is a ‘learn mode’ which means the MAPECU will observe the output from your stock AFM while you drive around and store the values it ‘sees’ in its internal table.  This gives the tuner a rough idea of the values you need to start with, e.g. is the frequency 30Hz or 100Hz at idle?  Once you have some base data, an experienced tuner can fill in the rest of the table based on experience so the car will run on the MAPECU ready for tuning.  Then in a combination or normal road tuning and dyno based tuning, the installer can fine tune the MAPECU for optimum performance and drivability.  This is very straightforward due to the Real-Time tuning capability of the MAPECU.  Most tuning can be accomplished with the tuner and his/her laptop in the passenger seat while someone drives the car normally.

Q. What RPM and pressures can the MAPECU deal with?

A. The MAPECU table allows for 0-8000 RPM and up to +30 PSI manifold pressure.  The unit can be ordered with different pressure configurations but the standard unit ships with a pressure scale of –12 PSI to +24 PSI in 2 PSI steps.

Q. Where should the MAPECU be mounted?  In the engine bay?

A. No.  The MAPECU should be mounted as close to the stock ECU as possible, to minimise the cable lengths, as long as the stock ECU is not mounted in the engine bay.  The MAPECU is very rugged but is not a sealed unit, like most ECU’s.  Usually the MAPECU is mounted next to the stock ECU in a kick panel or similar.  A pressure line does have to be run to the MAPECU for manifold pressure sensing.

Q. Do I need a PC connected to the MAPECU all the time?

A. No.  The PC is connected only for tuning and is disconnected afterwards.  A PC is only required if something is changed on the car and needs to be retuned.

Q. Is there a limit to the number of times I retune my MAPECU?

A. Not really, the memory in the unit can be reprogrammed 10,000 times.

Q. What happens if the MAPECU loses +12 Volts, do I lose my tuned table?

A. No.  The MAPECU uses non-volatile memory which means it does not need any power to retain its memory.  In fact, only switched 12 Volts is connected to the unit.

Q. What happens if my MAPECU fails, do I lose my tuned table?

A. In the unlikely event your MAPECU fails, any internal data may be lost.  However, you can save all the data from a MAPECU on disk using the PC application and it is a very simple task to transfer the data to another unit.  In fact it only takes approximately 50 seconds to restore a data file.

Q. Are there standard configurations for common cars?

A. Yes and no.  Some common tables can be provided but they are only useful as a starting point as every engine is different and the performance modifications are different.  Contact Performance Motor Research for a table similar to your car.


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