I'm going to build out this Thread with details on how to use a Speeduino to run the MSP in a piggyback Configuration. This is a great affordable unit for anyone who is capable of doing minor soldering and crimping of some wiring. The Speeduino will be have full control of Fuel and ignition, and the stock ecu will keep control of idle, AC, alternator charging etc. As of this weekend 3/16/24 I have successfully managed to get my MSP starting and idling with the Speeduino unit installed.
The Speeduino unit I installed was a unit from Openlogic EMS and can be purchased here:
openlogicefi.com
Because our cam and crank sensors are VR style you will also need a VR conditioner for the unit:
openlogicefi.com
If you're not comfortable with some minor soldering of some through hole PCB components, you can get a ready to go unit that contains the VR conditioner and a 2ft pre-crimped harness for approx $300 here: Fishdog (UA4C Seawolf) Speeduino ECU.
The only thing you would need to do on this unit is set the jumpers for VR on the board and do some wiring into the factory ecu harness.
Additional Parts that you will need for install:
GM IAT sensor and pigtail: https://www.ebay.com (commissions earned)
GM Coolant temp sensor and pigtail: https://www.amazon.com/dp/ (commissions earned)
Coolant temp sensor housing: https://www.amazon.com/dp/ (commissions earned) (this comes with 1/8 npt thread, but can easily be drilled and tapped to 12mm x 1.5 thread to accept the GM coolant temp sensor.
A spool of automotive grade wiring for building your harness: https://www.ebay.com (commissions earned)
Attached at the bottom is a PDF of the Pinouts for the Detonation EMSx4 unit and what corresponding pin number of the stock ECU they get wired to. The pin numbers are listed at the beginning and end of each row of the ecu plug, making it very easy to count forward or backward through the rows to find the pin number you need. Once I get a decent startup tune squared away I will post it up here also.
Google drive with my tune files can be found here: Speeduino Tune Files - Google Drive
This will be updated as I improve on the tune. My main mods are AEM intake, 2.5" j pipe back exhaust, FMIC, and a VICS, VTCS gutted intake manifold. Stock injectors, Stock Fuel Pump, stock turbo at 6 psi boost right now. It already pulls harder than the factory ecu with SSAFC at 9psi.
The Speeduino unit I installed was a unit from Openlogic EMS and can be purchased here:
Pre-Ignition x4 Slim ECU Assembled kit - Fully Speeduino Compatible — OpenLogicEFI
Fully Compatible with the the official Speeduino Firmware! No code modification required! Included: Slim Hammond extruded aluminum case. Pre-Ignition x4 (MX4C) Assembled ( except main connectors ). ECU headers, Harness side connectors and pins. 4bar Map Sensor AND Barometric
openlogicefi.com
Because our cam and crank sensors are VR style you will also need a VR conditioner for the unit:
Dual VR Conditioner (MAX9926) - Fully Speeduino Compatible — OpenLogicEFI
Designed by DetonationEMS this module is based on the reference design of the MAX9926 Dual Channel adaptive conditioner by Maxim Integrated. Specifically tailored for use with VR crankshaft and/or camshaft sensors, this module integrates with all DetonationEMS ECU models and is universally compati
openlogicefi.com
If you're not comfortable with some minor soldering of some through hole PCB components, you can get a ready to go unit that contains the VR conditioner and a 2ft pre-crimped harness for approx $300 here: Fishdog (UA4C Seawolf) Speeduino ECU.
The only thing you would need to do on this unit is set the jumpers for VR on the board and do some wiring into the factory ecu harness.
Additional Parts that you will need for install:
GM IAT sensor and pigtail: https://www.ebay.com (commissions earned)
GM Coolant temp sensor and pigtail: https://www.amazon.com/dp/ (commissions earned)
Coolant temp sensor housing: https://www.amazon.com/dp/ (commissions earned) (this comes with 1/8 npt thread, but can easily be drilled and tapped to 12mm x 1.5 thread to accept the GM coolant temp sensor.
A spool of automotive grade wiring for building your harness: https://www.ebay.com (commissions earned)
Attached at the bottom is a PDF of the Pinouts for the Detonation EMSx4 unit and what corresponding pin number of the stock ECU they get wired to. The pin numbers are listed at the beginning and end of each row of the ecu plug, making it very easy to count forward or backward through the rows to find the pin number you need. Once I get a decent startup tune squared away I will post it up here also.
Google drive with my tune files can be found here: Speeduino Tune Files - Google Drive
This will be updated as I improve on the tune. My main mods are AEM intake, 2.5" j pipe back exhaust, FMIC, and a VICS, VTCS gutted intake manifold. Stock injectors, Stock Fuel Pump, stock turbo at 6 psi boost right now. It already pulls harder than the factory ecu with SSAFC at 9psi.
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