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Technical Articles
MegaSquirt Information And Technical Help Note — these are here to help guide you and provide information. As with anything involving electronics, computers, and cars bad things can happen without proper research and planning. Do your homework. We cannot be responsible for any of your actions or their results whether based on this information or…
Read MoreUsing DIYAutoTune.com’s Revised Pattern Nissan Optical Trigger Discs
Converting your Nissan distributor to a more MegaSquirt friendly design Many Nissans used a distributor or CAS with a set of four or six inner slits and 360 outer slits. Current MS3 firmware supports the SR20DET, RB series, and VG30DE/DETT trigger wheels, but MS1 and MS2 are only able to use this type of trigger…
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Using the Tooth Logger and Composite Logger
The tooth logger and composite logger TunerStudio’s tooth logger and composite logger are powerful tools for troubleshooting problems with the MegaSquirt’s RPM input. These are both under the Diagnostic and High Speed Loggers menu. The tooth log records the time between individual pulses from the crankshaft position sensor. The composite log works similarly to a…
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Fox Body Mustang: Mass Air Flow vs. Speed Density – Which is better?
Isn’t Speed Density inferior and MAF the best tuning solution on a Fox Body Mustang? Nearly 30 years after Ford stopped production, the Fox Body Mustang remains insanely popular at the race track. There’s probably no single chassis you see more of at the average drag race track, and there is good reason for that!…
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How to MegaSquirt your Toyota Supra Mk4 2JZ-GTE (JZA80)
MegaSquirt for the Mk 4 Toyota Supra, and other non VVTi Toyota 2JZ-GTE and 2JZ-GE applications The 2JZ engine gave the Toyota Supra a reputation as one of the top Japanese performance cars of the 1990s, and has also been a popular motor to swap into other platforms. DIYAutoTune’s 240SX land speed car is running…
Read MoreDIYPNP JECS 93 Pin Adapter Board Assembly
The JECS 93 Pin Adapter Board has some extra circuitry for 3 wire IAC control. Here’s how to assemble it. As with the main board assembly, if it’s important not to get a component backwards, we have marked the step with (+/-). Install all four resistors R1A through R4A in their respective slots. (+/-) Install D1A…
Read MoreI have a (insert year, make and model here), what exactly do I need to order for my car?
We’ll be glad to help you spec a system for your car but we’ll first need some basic information. The following list of questions will generally need answers to in order to assist with this. You can find this information in service manuals for your car/engine, on message boards and enthusiast sites, or sometimes by…
Read MoreInside the V3.57 Board
The V3.57 board is mostly a surface-mount version of the V3.0, designed for automated assembly. However, it has a few interesting features added to it to make it easier to configure for extra inputs and outputs. The most obvious feature is the extra DB15 connector next to the DB9 serial port. Three of the pins…
Read MoreHow to Use the MegaSquirt 5.0 Mustang Adapter Harness
Note: The adapter harness kit is discontinued. This page is for reference for people still using this harness. For the latest in EASY Plug-N-Play Engine Management Solutions for 5.0 Foxbody and SN95 Mustangs check out these products: Ford Foxbody Mustang 5.0 1986-1993 MS3Pro PNP Plug and Play ECU Ford Mustang 5.0 1994-1995 SN95 MS3Pro…
Read MoreJamesl’s Original ‘MegaSquirting Your MR2’ Article
(Warning! This article, and the setup discussed, focuses on the 1987 Toyota MR2 with the stock 4age engine and stock VAST ignition system. I do NOT know if this setup will work with any other car or any other model year of the MR2 – it definitely won’t work with cars using Toyota’s ESA…
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