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Megasquirt Electronic Fuel Injection System

A True Low-Budget Multipoint EFI System

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Component Manufacturer PN Price
ECM board MegaSquirt MSPKIT $120.00
Digi-key parts Digi-log - 51.40
Relay board kit MegaSquirt RELAYPCB 15.00
Relay board parts Digi-log - 38.91
Stimulator box MegaSquirt STIMPCB 20.00
Stimulator parts Digi-log - 21.92
Injectors, 36-lb/hr MSD 2018 421.00
Injector harness MSD 2400 15.00
Coolant sensor MSD 2310 12.00
Air inlet sensor MSD 2320 17.00
Oxygen sensor,
heated three-wire MSD 2330 73.00
Bung for
oxygen sensor MSD 2335 19.00
MSD 6A box MSD 6200 150.00
Used TPI manifold pre-owned - 200.00
Misc. wiring
and parts - - 50.00
Performance-tuned
runners SLP 20002 260.00
Gasket set SLP 20030 20.00
Total $1,504.23

If you cleaned a set of used injectors, reused original sensors, and passed on the MSD box and SLP runners, you could get this price down to around $600, and that's assuming you're starting with a clean slate.

This is a volumetric efficiency (VE) table we generated using the MegaTune software for a 350ci engine idling at 900 rpm with no more than 15 inches of vacuum. We estimated peak torque at normally aspirated 440 lb-ft at 4,000 and peak hp at 375 at 6,000 rpm. We loaded a similar table into our engine, and it fired right up and ran respectably while we fine-tuned it for best power. The numbers in this VE table represent the percentage of cylinder filling. To enrich the mixture, increase the number value in the corresponding box. The vertical scale is load (expressed in kPa or kilopascals-metric for pressure where 1 kPa = 0.145 psi). The horizontal scale is rpm.

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