Description
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The tune builder is a M4.4 ECU, modified with a bootloader switch for flashing new tunes and a MAP (boost pressure) sensor for datalogging boost values. This is a full tune, calibrated to your exact setup, which comes with all the support necessary (logging and reflashes) to maximize the amount of power your setup can safely produce.
For a basic primer on how iterative tuning works, please see the how it works section of the website.
The modifications required to run a M4.4 ECU on a car originally equipped with M4.3 car are included free of charge.
Options Explained
Core Provided: If you prefer not to send in an ECU for modification, leave this option as is. We have plenty of M4.4 ECUs on hand, so there is no need to send your own in. If you’d prefer not to pay the $75 core fee, you can send us a turbo M4.4 ECU. If you’d prefer to send the core ECU in after a tune purchase, the $75 core fee will be returned to after we receive the ECU. If you are unsure if your ECU is a suitable core, please email us a picture of the label.
VAG-COM Cable: This is required for logging and flashing new tunes. If you do not already have a VAG-COM cable you will need to purchase one.
VAG-COM Cable in ECU: For 1992-1995 850’s without an OBDII port, you can have a VAG-COM cable added into the ECU. The ECU will have a 3 foot USB cable coming out the top. You will need a USB A extender to get this cable into the cabin of the vehicle. For cars with the diagnostic blink box in the engine bay, the blink box will no longer work with a M4.4 ECU. You will need to use the VAG-COM cable and laptop to read engine codes. Reading codes from other modules will still work.
OBDII Extension: This is a right angle OBDII socket extension with a flat wire lead. This will allow 1998 cars with the OBDII port in the center console to close the console while logging.
MAF Housing: For those who are planning to push past the measurement capability of the stock MAF housing (~275WHP). This is only the cost of adjusting the tune for the MAF housing installed. You will need to purchase a MAF housing. Please see this link for a full explanation of upgrading the MAF housing.
Coil On Plug: This adds coil on plug functionality to your tune and includes a plug and play, new wiring sub-loom for the coils. The product photo shows the coil on plug loom. You will need to provide your own Bosch ignition coils. Please see the coil on plug page for more information. Ignition coil part number for non ‘R’ heads: 30713416. For R heads: 30713417
Burbles/Crackles: This feature retards timing and increases fueling when the car is coasting with no throttle input. This will cause popping and banging from the exhaust. Anything other than a straight through exhaust will muffle the sound, sometimes significantly.
Alternate Mapset: A second map set, allowing you to switch injector calibrations, fuel map, ignition map and boost maps on the fly, without the need to flash a new tune. Usually this is used for a gasoline and E85 map, but can be used for water methanol injection or a high performance and high fuel economy map.
VVT Control: For those running RN engine with single or dual VVT control, this option adds open loop control of the VVT cam solenoids to the ECU, vastly improving the width of the powerband. In order to run dual independent VVT control you must run wideband lambda regulation and COP. VVT connectors are added to the COP loom when ordered at the same time as the COP add-on.
Launch Control/Anti-lag: This adds a routine which will trigger when the car is stationary and the throttle is fully floored. The routine can be configured as anti-lag, which will generate significant engine load and allow the engine to be laucnhed will more power from a stop. It can also just be used to show off, and will shoot flames out of the exhaust. Anti-lag can be quite hard on an engine, so its use may lead to engine damage. Alternatively, the routine can be configured just as a secondary rev limit, which can be useful for dialing in the correct launch RPM.
Wideband Lambda Regulation: This option removes the stock O2 sensor, and instead uses the signal from a wideband controller to control closed loop fueling (STFTs). You need a standalone wideband gauge/controller to interface with the ECU, the AEM X-Series wideband is highly recommended. Please see this link for more information.
Multi Purpose Output: Adds a ground switched output to the ECU which can be triggered based on boost, engine load, RPM or any other ECU parameter. Useful for turning on a water methanol system, shift light or NOS solenoid. Unless your car is a 1998 you will need to wire in a relay to control whatever external device you wish to trigger. 1998 cars have existing circuitry that can be repurposed for this purpose.
Ignition Coil: The ignition coil charge time (dwell) must be modified to suit the ignition coil type installed.
Vacuum Line: The correct length and diameter of silicone tubing for connecting the MAP sensor port on the ECU to the intake manifold vacuum tree.
