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VAC - "Stage 3 Pro" S14 Performance Kit

$5,264.95 $4,699.95

Purchase VAC - "Stage 3 Pro" S14 Performance Kit

VAC - Save a ton on this package! A huge hit this year with our customers.

If your are looking to competitively race your S14 or simply to make your E30 M3 or M2 a daily driver with modern reliability, VAC Motorsports Stage 3 Pro kit is the final answer.

VAC motorsports have been involved with BMWs since before the E30 M3 was new. For 20+ years we have continued to support these cars with the latest and greatest technology and performance advances. We know exactly what it takes to get world class results from the S14 because we do it every day for customers around the world. When the time had come to bring in a first class engine management choice to compliment our MoTec line, and didn't break the bank, we finally found KMS.

The heart of Stage 3 is the engine management. Provided by a top of the line yet still cost effective MA25 KMS ECU. Enclosed in a rugged mil-spec billet aluminum enclosure, compact and lightweight design, and easy to use software; it asserts itself as a well well engineered and easy to use product and suits the S14 engine perfectly.

Stage 3 pro include integrated in car Wide Band Lambda display with the ability to display other outputs you select from the ECU (oil temp, watter temp, boost pressure, ect).
Built in Wide-Band O2 sensor enables self-learning functionality, and greatly simplifies install and tuning.
The Stage 3 Pro kit also eliminates the factory ignition coil and distributor setup. Running a distributor-less waisted spark KMS ignition coil increase reliability, efficiency, and the net result: a smoother, more powerful, responsive S14.

Proven in grueling race circuits and by street customers alike, VAC customers have been thrilled with the results on their E30 M3s.

    Some built in features are:

  • Complete engine management system up to 10 cylinders and 15,000 RPM
  • Lambda-control: Full Self mapping of fuel. Uses a Air Fuel Target map for every Load & Speed site using standard or wide band sensor.
  • Boost-control: Boost pressure mappable to RPM & Overboost Function
  • Variable launch-control
  • Anti Lag System (for turbo vehicles)
  • Idle Control for use with various intake setup
  • Power shift (separate delay and cut off time for each gear)
  • 3 auxiliary outputs (shift-light, water injection, cooling fan etc.)
  • RPM limiter: both soft and hard cut
  • Engine diagnostics
  • 2 Engine load type sensors (eg. MAP and TPS simultaneously)
  • Analogue input (second lambda sensor, gearbox position sensor etc.)
  • available in a plastic or aluminum housing

    High quality Standalone Engine Management rewards you with more power, control, and reliability with your engine than any other solution, including piggyback fuel controllers like Alpha / N units.


The KMS ECU gets it's crank signal from the VAC Crank Trigger kit also included for trouble free install and use. Deceivingly simple; this aerospace grade crank trigger sensor, trigger wheel, and mounting bracket mean reliable and accurate control for the life of the vehicle.

A VAC TPS adapter is included. The standard S14 TPS is not a potentiometer type, and only functions as an on and off switch. Our kit provides a 0-100% Throttle signal to the KMS ECU without any fabrication required. Also included is our exquisite VAC DTM Carbon Fibre Airbox with full installation kit and snorkel. Nothing budget minded about this piece other than its price! The craftsmanship of our airbox kit is the best we have ever come across, you will be thrilled! This is what you need to make maximum all motor power from a stock to fully modified S14.

With this kit, a 2.5 liter and 284/272 Schrick cams, through tuning you can achieve a S14 that idles like stock with improved driveability and torque! Even a 292/284 cam setup can be a pleasant street car with just a slight hint of the monster inside. It's even possible to go with forced induction or with an engine swap down the road.
Once this kit is installed, you can get maximum potential no matter what route you chose to go.