MegaSquirt

Classic 3 with MS3X Expansion Engine Management System

$799.99

SKU: MS3-MS3X

In Stock
In Stock
Ships by Aug 31
Free Shipping over $200
$100 Minimum Order
30 Days Return

Description

The Classic MegaSquirt 3 with MS3X Expansion is a powerful and flexible engine management solution designed for competitive drag cars, time attack machines, or high-performance street cars. It offers advanced capabilities that surpass earlier MS1 and MS2 systems, including sequential fuel and spark, boost control, 2-step launch, progressive nitrous, and onboard traction control, making it ideal for budget-conscious racers seeking professional-level features or custom EFI conversions requiring full sequential control. This ECU features 8 sequential fuel injector outputs, each capable of driving a high-impedance injector, and 8 logic-level ignition outputs that support LSx coils and other smart coils. It also includes 6 medium current outputs suitable for boost control, fan control, or relay outputs, along with 3 analog sensor inputs for connecting external sensors like MAP or O2 sensors. Additionally, it offers 4 switch inputs for functions such as table switching or launch control, and 1 cam sync input compatible with various cam sensor types. The system provides 16x16 VE and ignition tables for precise tuning, with 0.1% fuel step resolution and 0.1° ignition accuracy. Data logging is supported via a built-in USB port and an SD card socket. The MS3X also features CANBus support for expansion modules and includes idle and mixture control, supporting GM stepper IAC and closed-loop idle and AFR control. Extensive OEM trigger pattern support is built-in for compatibility with many crank/cam signals. Note that this system requires external ignition drivers or smart coils, and an SD card and wiring harness are sold separately.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandMegaSquirt
Part NumberMS3-MS3X
CategoryIgnitions and Electrical

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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