I've been researching this as well, and have compiled this info. I'd like to know if anyone has any other thoughts on these methods for ignition/boost retard? Also, is there any cheaper/alternative devices that accomplish this?
MSD-6 Boost Timing Master - $450
HEI Distributor - $60+
Blaster Coil (optional) - $50
Well known device designed specifically for ignition and timing control. Very User friendly but not as powerful as a Megasquirt system. Can be used with aftermarket coils but they're known to fail so Blaster coil is recommended. Will not work with points distributor (without more $).
or--Un/Assembled Megasquirt1 v2.2PCB - $169/$269 (bottom dollar option)
--Un/Assembled Megasquirt2 v3 - $279/$435 (cheapest future-proof option)
Stimulator - $59
Intake Air Sensor + bung (for boost reference) - $31.25
Tuning Cable - $5.50
USB Adapter (only if laptop doesn't have serial port) - $22.50
Wiring harness (optional) - $67
Cheaper cost results in user having to assemble unit and have ability to use laptop and follow/understand more complicated instructions. Has fuel control features making it a standalone engine management system. Can be used to monitor wideband, exhaust temp and knock (extra $). Several internal combinations available (MS1/2/3 and PCB v2.2/3/3.57) which will increase feature set and/or processing power. Works with any distributor.
orJ&S Safeguard Universal Ver - $595
Knock Sensor (optional) - $50
Knock based timing control sensor capable of reading boost and retarding individual cylinders in real time. Probably the best knock-based device but is limited in other features provided by MSD/MS. Can do timig retard without knock sensor but device is limited without it. Works with any distributor.
or Specific 5 Pin GM HEI Module +
Pressure sensor and various parts - $100
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Instructions here)
Assuming you have or can find the correct module and don't mind a full DIY approach, this is the cheapest way to solve boost timing retard. Does not provide any other benefits offered by above units.
