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Use this adapter board to fit both the Megasquirt and the adapter into your stock ECU case. This is the board for TBI-equipped small block Chevies and big block Chevies. It fits a variety of trucks from 1988 to 1992, as well as an assortment of Camaros, Caprices, and others. Marc Piccioni's GM TBI adapter board (currently available in bare PCB form) allows you to install MegaSquirt into GM products with the ECM number 1227747 or 122746. These appeared on a wide variety of 4.3 V6s, 5.0 (305), 5.7 (350), and 7.4 (454) V8s. This is the bare adapter board. In addition to this PCB and a donor ECU, you will need the following parts to assemble this board: | Component | Description | Digi-Key Part Number | | LS1, LS2 | SPDT relay | 255-2080-ND | | R1, R4 | 1.0K resistor | 1.0KQBK-ND | | R2 | 47K resistor | 47KEBK-ND | | R3, R6 | 10K resistor | 10KEBK-ND | | R5 | 560R | 560KQBK-ND | | D1 | 4.7V 500mW zener | 1N5230BDICT-ND | | D2 | 1N4001 diode | 1N4001DICT-ND | | Q1 | TIP121 | TIP121GOS-ND | | Q2 | 2N3904 | 2N3904FS-ND | | J1 | DB37 female connector | 192-037-213-561-ND |
This adapter board is intended for MS-II applications so you can use the stepper IAC control. This board has provisions for controlling the lock-up torque converter and using the stock knock sensor input. It also lets you use the GM MAP sensor with appropriate mods to the Megasquirt. We have a complete page with assembly instructions for the GM TBI adapter board. CLICK HERE to see this article.
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