MAF CAL Advance is a development of the MAF CAL, MAF sensor calibration tool. In addition to the functions in MAF CAL, MAF CAL ADVANCE allows user defined AFRs according to load by adjusting MAF signal. Tune Assist function also available when MAF CAL ADVANCE connected to analog wideband controller signal.
RELEASE DATE Q3 2026
IMPORTANT
MAF CAL and MAF CAL Advance work with analog type MAF sensors only. They are not designed for frequency signal type MAFs.
MAF CAL Advance enrichment and closed loop functions require engine ECU to operate on open loop fuel control.
MAF CAL Advance – Key Features
Adjust fuelling according to MAF signal only
Adjust fuelling according to MAF signal & MAP*
Target two air fuel ratios, idle/low load & high load. (AFR target is automatically interpolated between load thresholds).*
Open loop and closed loop* modes
(Closed loop operation requires input from external wideband lambda sensor eg Innovate, Lambda sensor not included).
Why Choose MAF CAL Advance
Adjust fuelling without remapping engine ECU
No laptop required
Technical Data
Product Type: Sensor Calibration
Ambient Operating Temperature: -10C to 70C.
MAF Signal
Signal Input: 0-5volts analog signal only. Digital/SENT signals not supported
Signal Output: 0-5volts
Signal Output Current: Max 20 milliamps
Maximum MAF Signal Adjustment: +/- 50%
MAF output signal accuracy: +/- 0.01 volts
MAF Input Measurement Accuracy: +/- 0.01 volts
MAF Input Update Interval: 65 milliseconds
MAF Output Update Interval: 65 milliseconds
Power
Power Supply Requirement: 12-16 volts
Sensor Power Output (for external MAP sensor, not included): 5 volts (1 amp max current)
Sensor Input Specs
Lambda Input Update Interval: 130 miliseconds
MAP Input Update Interval: 130 milliseconds
MAP Signal Input: 0-5 volts (analog only)
Lambda Signal Input: 0-5volts
Lambda Signal Input to Lambda Conversion: 0 volts = 0.5λ, 5 volts = 1.5λ, Linear relationship.
MAP Sensor Input Calibration (Calibrated to Bosch)
2.5 BAR MAP Sensor: 0.4 volts = 20kPa, 4.65 volts = 250kPa, linear
3 BAR MAP Sensor: 0.4 volts = 20kPa, 4.65 volts = 300kPa, linear
4 BAR MAP Sensor: 0.5 volts = 50 kPa, 4.5 volts = 400kPa, linear
Closed Loop Operation
Closed Loop Lambda Target Tolerance: 0.01λ
Closed Loop Dynamic Adjustment Interval: 1.5 seconds (when load is “stable”)
Closed Loop, Load (MAP) Stability Requirement: +/- 0.24 signal volt for >2.5 seconds
(0.24 volts = 12kPa 2BAR sensor, 14.6kPa 3 BAR sensor, 19.5kPa 4BAR sensor)
Closed Loop (Load) Maximum Adjustment: +/- 3% of programmed adjustment
Closed Loop (Idle) Maximum Adjustment: +/-4% of programmed adjustment
Applications
Compatible with 0-5v signal analog MAF sensors with signal current output not exceeding 20 milliamps.
Not compatible with frequency or SENT type MAF sensors.
Product Contents
Main MAF CAL Advance control unit
MAF CAL Advance Android app (download for this page)
MAF CAL Advance installation and user manual (download from this page)
Bare Connector with boot
Labelled bare wiring loom (if ordered)
Not Included
MAP sensor
Wideband lambda sensor
MAF sensor
MAF CAL Advance, Functions – Overview
NOTE: These advanced functions can only be used/will only work when engine ECU is working in open loop fuelling.
Function – Enrichment
With function off, MAF signal is compensated using the base setting only, “Stored Mult”.
With function on, MAF signal is used to enrich fuelling above “Min Load” Setting. Enrichment compensation peaks when “Max Load Enrich” threshold exceeded.
Min Load – Base lambda target, no enrichment below this threshold
Max Load – Above this threshold “Lambda Target Rich” used for target AFR
Between Min and Max load AFR target is interpolated.
Lambda Targets
Below “Min Load” Threshold, “Lambda Target Idle” used for closed loop AFR target
Above “Max Load” Threshold, Lambda Target Rich” used for closed loop AFR target
Between Min Load and Max Load AFR target is interpolated.
Function – Closed Loop
Uses signal from external wideband lambda controller eg Innovate (not included)
With Closed Loop function Off, MAF signal adjustment uses Stored values
With Closed Loop function On, MAF CAL Advance uses wideband signal to adapt MAF compensation to achieve AFR targets which have been entered by user.
NOTE: Use **must** be aware of the potentially disastrous knock on effects of controlling fuelling by manipulating the MAF signal.
For example, reducing MAF voltage will lead engine ECU to run with more advanced ignition timing, this can cause catastrophic engine damage.
If you have installed larger injectors, tuning the MAF sensor signal is *not* the way to go to recalibrate fuelling.
Again, user must be aware of the downsides of adjusting fuelling using the MAF sensor signal BEFORE purchasing. MOVICHIP accepts no responsibility for any damage.
Functions – In Detail
Enrichment Mode
Different MAF calibration (different AFR) according to load. On or Off.
With function activated, user sets the MAP signal when the load compensation should start and at what load (kPa) enrichment should reach it’s maximum. eg start enrichment at 0 kPa relative pressure and give maximum enrichment from 50 kPa+. User chooses two settings for each MAF voltage as per MAF CAL. One is standard calibration compensation the other the maximum compensation. MAF CAL Advance interpolates the compensation percentage between 0 kPa and 50 kPa (in this example). From 50 kPa and up max compensation value is used.
Auto Tune/Closed Loop Fuel Control
Using an analog signal from a wideband lambda sensor, MAF CAL Advance can assist in the calibration of the MAF sensor to achieve the user desired lambda target.
User selects their desired lambda target for normal and max load conditions. MAF CAL advance will automatically adjust the MAF calibration to guide the user towards the optimal signal adjustment to get the desired lambda ratio.
Example. Target Lambda 1 up to 0 kPa relative. Target Lambda 0.81 from 50 kPa relative and above. MAF CAL Advance will adjust MAF calibration to meet these targets. MAF CAL app displays values it is using to try to achieve AFR target.
Additional Features – Closed Loop Operation
Tolerances
If Lambda is within 0.1 of target MAF CAL advance will not make any adjustment.
Max auto adjustment for normal load is +/- 4% from Stored setting.
Max auto adjustment for load setting (above 0 kPa in this example) is +/- 3% from Stored setting.
(Manual adjustment range is +/- 50% of MAF signal).
If user sees the auto adjustment range maxxing out, compensation should be manually adjusted to the max value. Auto adjustment range will adjust from this new baseline.
Timing (Cold Start)
Closed Loop auto tuning will only happen after MAF CAL Advance has been powered for 3 minutes. This can be overridden, by switching Closed Loop to Off and back to On manually using the MAF CAL Advance app.
We do not want to use calibration numbers obtained when engine is not at normal operating temperature. In other words either engine should be warm when using compensation numbers produced by closed loop function.
Memory
If engine is switched off before auto tune values have been transferred to main settings, auto tune adjustments will be lost.
User should view the auto correction values and manually enter these values before turning off the MAF CAL ADVANCE. See the MAF CAL ADVANCE manual for details.
Updates
App screenshots and general information will be coming closer to the release date. Subscribe to the newsletter to get updates in your inbox.
