MAFSync

Aftermarket airflow meter translator device. Pre-tuned and shipped for your specific engine selection. Converts your AFM signal to run a modern mass airflow sensor — clean idle, stable fueling, no ECU modification required.

First Batch Production Run — 4–6 Week Lead Time. This is the first production run of MAFSync. Orders placed now will ship approximately 4–6 weeks after the batch order closes, plus transit time. Off-road and competition use only. Not responsible for engine damage or mechanical issues arising from installation or use. See full terms before ordering.

Build Your Kit

● First Batch — Pre-Order Open
Step 1 — Select Your Engine
✓
M20B25
2.5L inline-6 · Motronic 1.3
✓
M30B35
3.5L inline-6 · Motronic 1.0/1.1
✓
M40
1.6/1.8L inline-4 · Motronic 1.3
✓
M42
1.8L inline-4 · Motronic 1.7
✓
M43
1.6/1.8L inline-4 · Motronic 1.7
More
Opel, Alfa, others
Notify Me

Displacement
Configuration
Stock Power
ECU
AFM Type
Found In
Step 2 — Select Kit
Module + MAF Only
MAFSync unit + MAF sensor. Build your own harness using the provided pinout diagram. Tuning pre-loaded for your engine.
$349
Plug & Play — Rectangular 5-Pin
Module + MAF + full harness. Rectangular 5-pin OEM connector. Drop-in fitment for compatible applications.
Rectangular 5-pin connector
$549
Plug & Play — Round 7-Pin (5 used)
Module + MAF + full harness. Round 7-pin OEM connector, 5 pins active. Drop-in fitment for compatible applications.
Round 7-pin connector
$549
Step 3 — Add-Ons (Optional)
Tuning Software & App Coming Soon
Dedicated MAFSync tuning app — Bluetooth parameter adjustment and live monitoring. Units ship now with pre-loaded engine profiles. App will be available as a free future update.
—
✓
Airbox Adapter Kit
Coupler + 2 black clamps. Adapts your existing airbox to the MAF sensor inlet.
+$60
Total—
—
Select engine & kit to continue
Secure checkout via Stripe

Supported Engines

BMW M20B25 — 2.5L Inline-6

The M20B25 is BMW's workhorse inline-six from the late 1980s through early 1990s. A 12-valve SOHC design producing around 168 hp stock, it was fitted to the E28, E30, and E34 5-series and 3-series. The ECU is Bosch Motronic 1.3, which uses a vane-type airflow meter (AFM) to measure intake air mass. Motronic 1.3 is one of the most widely supported platforms in the MAFSync codebase — the translation curve is well-characterised and stable across known AFM variants.

E28 525iE30 325iE34 525iMotronic 1.3~168 hp

BMW M30B35 — 3.5L Inline-6 +$50 P&P kits only

The M30 is BMW's long-running big-block inline-six, a 12-valve SOHC unit displacing 3.5L and producing 208–215 hp depending on variant. Found in the E28 535i, E34 535i, and E32/E38 7-series, it uses an earlier Bosch Motronic 1.0 or 1.1 ECU with a larger-body AFM. The M30 surcharge reflects the additional calibration work required for the larger airflow range and earlier ECU signal characteristics.

E28 535iE34 535iE32 735iMotronic 1.0/1.1~208 hp

BMW M40 — 1.6/1.8L Inline-4

The M40 is the base 4-cylinder used in entry-level E30 and E36 models from 1987 through the mid-1990s. An 8-valve SOHC design, the 1.8L variant produces around 113 hp. Like the M20, it runs Bosch Motronic 1.3 and uses a vane-type AFM. The M40 shares much of its ECU architecture with the M20, making it a straightforward MAFSync application.

E30 316i/318iE36 316i/318iMotronic 1.3~100–113 hp

BMW M42 — 1.8L Inline-4 +$50 P&P kits only

The M42 is BMW's high-revving 16-valve DOHC 4-cylinder, producing 136 hp from 1.8L. Found in the E30 318is and early E36 318i/318is, it runs Bosch Motronic 1.7 — a more advanced ECU than the M40 with a different AFM signal curve and tighter closed-loop fueling strategy. The M42 is the original proven platform for MAFSync.

E30 318isE36 318i/318isMotronic 1.7~136 hp

BMW M43 — 1.6/1.8L Inline-4 +$50 P&P kits only

The M43 replaced the M40 from 1991 onward, retaining the 8-valve SOHC architecture but with updated fuel delivery and Motronic 1.7 ECU. The 1.8L version produces around 115 hp. While the M43 shares its ECU generation with the M42, its AFM signal calibration differs — the MAFSync firmware handles this as a separate tuning target.

E36 316i/318iE46 316iMotronic 1.7~102–115 hp

How It Works

The Problem It Solves

Bosch Motronic 1.x ECUs measure intake air via a vane-type airflow meter (AFM). These units are old, discontinued, and increasingly unavailable. Modern hot-wire MAF sensors are plentiful and accurate — but they speak a different signal language than the factory ECU expects.

MAFSync translates the MAF sensor's output into the AFM signal curve the ECU expects. The translation is pre-tuned for your specific engine and ECU combination before shipping.

What's Included

  • MAFSync translator module — pre-tuned for your engine
  • Bosch hot-wire MAF sensor
  • Harness (P&P kits) or pinout diagram (module-only)
  • IAT compensation — onboard sensor, real-time
  • NVS calibration storage — settings survive power loss
  • Field-updateable firmware via USB

ECU Compatibility

ConfirmedBosch Motronic 1.3, Motronic 1.7
In DevelopmentMotronic 1.0, Motronic 1.1 (M30)
Signal TypeVane AFM analog voltage — translated to MAF-spec output
Tuning MethodPre-loaded engine profile — ships ready to run. Tuning app coming as a future free update.
PlatformCustom firmware — based on prior Nano implementation, rewritten for production
Running something not on the list? Reach out before ordering. If your ECU uses a similar vane AFM signal architecture, it may be supportable. Tell me what you've got — it goes on the development list.

About This Product

MAFSync started as a solution to a single problem on a single car — a discontinued M42 AFM with no clean replacement. The fix worked. The firmware was refined. The same core approach now covers the M20, M40, M42, and M43, with M30 in active development.

Every unit is hand-built, firmware-flashed, and bench-tested for your specific engine selection before it ships. One-person shop — no support queue, no outsourcing.

Follow the build on YouTube @ReviveUrRide.

Shipping

MAFSync ships worldwide from London, Ontario, Canada. Shipping is calculated and collected at checkout via Stripe. All orders are tracked. This is a first batch production run — allow 4–6 weeks from batch order close to shipment, plus transit time. You will receive a shipping notification with tracking when your unit is on its way.

Batch Lead Time4–6 weeks from order close date to shipment
CanadaCalculated at checkout · Tracked
United StatesCalculated at checkout · Tracked
InternationalCalculated at checkout · Tracked
Damaged in TransitContact within 48hrs of delivery with photos — we'll sort it out
ReturnsManufacturing defects only — see warranty terms
International buyers: Import duties and taxes are the responsibility of the buyer. Packages are declared at full value — we don't mark items as gifts or undervalue shipments.