Author: Matt Cramer


High performance Miata builds need high performance ignition systems; the stock ignition coils typically won’t cut it if you’re running a lot of boost on your turbo Miata or supercharged Miata or otherwise increasing the cylinder pressure (high compression n/a builds). We’ve done several of own turbo Miata builds. We’ve worked with a LOT of…

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MicroSquirt has long been the go to choice for a low cost, super capable standalone ECU. Our original intention for MicroSquirt was powersports, ATVs, and motorcycles — small engines — but shortly after launch, our customers installed it in everything from golf carts to turbo V8 race cars. Having to have the board modified to…

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Engine management made in the USA – or on your kitchen table

Posted on June 28, 2021

At DIYAutoTune, we believe in supporting local manufacturing, and when we need to outsource parts like PCBs, some of our wiring harnesses, or enclosures, we always keep production in the USA. AMP EFI MSPNP and MS3Pro ECUs as well as DIYAutoTune’s other MegaSquirt assembled ECUs all have final assembly at our production line in Gainesville,…

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Many engines from the 1990s and later already have enough sensors to fully support sequential fuel injection. But what if you’re converting an older carbureted engine to EFI, or want sequential injection on an engine with an early bank to bank EFI system? Sometimes, you may be able to get an easy bolt-on solution from…

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The MS3Pro EVO harness is very similar to the original MS3Pro harness – the major differences are that we have repurposed the USB and serial wires for extra analog and VR inputs, and since the MS3Pro EVO has an internal MAP sensor, the MAP wire has been renamed Analog In 6. All other pins besides…

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Andy Lamus is a veteran tuner who has traveled the world teaching his TunerTek tuning classes about tuning a variety of standalone and OEM engine management systems. DIYAutoTune will be hosting his MS3Pro and MegaSquirt class on March 21 and 22, 2020. The cost of this class is $550 per person, and you can register…

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SEMA may be the performance trade show that attracts the cars with shiny paint and wild cosmetic mods, but at PRI the cars on display may have just come off the race track complete with caked on rubber and on scrapes from where somebody may have cut a pass a little too close. Naturally, the…

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If you’re installing a MSPNP or DIYPNP in your ’99 to ’05 Miata, there’s several ways to mount it, from zip ties or modified brackets to third party adapters. Jackson Risi created a set of snazzy 3D printed brackets to put an MSPNP Gen 2 or DIYPNP in a second generation Miata, and he’s uploaded…

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The MS3 has a dedicated A/C control option, allowing the ECU to take several actions to control the A/C. These include a full throttle cutout, increasing idle speed while the A/C is active, compressor overspeed protection, and more. The wiring needed is very straightforward. You’d need an on/off switch on the dash, a cycling pressure…

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When using the MicroSquirt as a transmission controller with an MS3, many of the MicroSquirt’s analog inputs go unused. The MicroSquirt has seven analog inputs, but it only reads the transmission temperature and possibly an analog shifter, using the ECU for engine load data. Want to use these extra inputs to run functions in the…

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