Enthusiastic about EFI Tuning?
Speed Density Tuned will give you commonly known advice to safeguard your vehicle and prevent unnecessary costs.
In an industry with so much information, it is understandable that you could soon feel overwhelmed. Understanding the basics of EFI Tuning is a valuable skill to develop.
Calibration is not a quick process, a well calibrated engine relies on data capturing and tune optimisation. Unlike traditional Tuning, most of the data collection is done under steady state conditions. Wide Open Throttle Runs does not optimise the tune across the rev range. An example is cruising at 4K RPM in high gear, downshifting or pedal to the medal?
Your ECU deals with these changes in milliseconds. The camshaft degree tables, fuel enrichment tables, boost targets, and many more maps needs to be analysed before you even blinked.
We don't judge you at all, playing nicely together is how we were told to be.
Over boosting and lean fuelling is two of the biggest concerns.
A well calibrated engine will hit boost target without oscillation, Variable Camshaft PID algorithms optimised. This can only be achieved through data collection, calibration, and confirmation.
Catastrophic engine failure can be prevented with the correct calibration of engine protection maps
The evolution of calibration has proven beyond a doubt, the better we understand OEM ECU technology, the more reliable the power gains will be.

WORKING TOGETHER
Challenge: Subaru WRX
01
Analysis OEM ECU data
Mass-Airflow Calibration error in stock form between 2400 - 3200 RPM under light throttle (cruising area) Subaru's solution, MAP compensation tables.
02
Ignition Advance Multiplier (IAM) map
Subaru OEM ECU failsafe maps to compensate for the AFR Error. Fantastic for stock ECU's. Problematic when not addressed in aftermarket applications.
03
The Solution
Discrepancy between Wideband and OEM Oxygen Sensor addressed with Math channels. Histogram data essential.
04
Calibration 101 done
Significant increase in power across rev range.
Long-term and short term fuel trims below 3%. Requested AFR in line with actual AFR.
An Engine Control Unit (ECU) uses algorithms to control and optimize engine performance. Mass Air Flow sensor calibration is critical.
What is MAF Calibration?
Mass Air Flow Calibration is the process of adjusting the ECU MAF sensor calibration to accurately measure airflow into the engine.
A common mistake is to upgrade to a bigger intake system, and ignoring the effect of OEM MAF calibration on the diameter of the aftermarket intake. The error manifests in Long-Term Fuel Trims, which affect the whole Tune. This vital sensor is arguably the most crucial sensor to calibrate correctly.
'The right calibration can make all the difference between a good engine and a great one.'
— Carroll Shelby
If knowledge is power, the best investment possible, is an investment in yourself.
Spending hard earned money on aftermarket upgrades, and ignoring the basic engine fundamentals can become very costly.
Boosted or N/A, the fundamentals of internal combustion doesn't change. An expensive reality.
Science = Power
The evolution = Unknown