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Troubleshooting
Problem: Power is applied to the VVTuner, but the LED does not illuminate. Solution 1: Confirm that the polarity is not reversed on the VVTuner connector. Solution 2: Confirm that the wires are connected in the proper locations on the VVTuner connector. Solution 3: Confirm the voltage supplied to the VVTuner is no less than…
Read MoreTuning Guide
Looking for the DIY EFI Tuners Guide? Say no more. Here it is! Tuning the VVTuner Standalone VVT Controller for Miatas. Once properly installed and communication has been established between the tuning laptop and VVTuner, the controls and use will be fairly straight-forward if you’ve even done any tuning before. When you…
Read MoreVVTuner Standalone Programmable VVT Controller
Introduction An old hot rodding trick is to change the amount of cam advance to produce small changes in the way an engine behaves. Advancing the cam can add low RPM torque at the expense of high RPM power. Retarding the cam often has the opposite effect: It adds power at high RPM and takes…
Read MoreDIYPNP FAQ
UPDATE: Unfortunately, the DIYPNP product line has reached it’s end of life. This F.A.Q. page will remain available for archive purposes. Is a DIYPNP fully assembled? Do I just plug it in when it arrives? The DIYPNP ships in kit form and allows you to build a Plug-N-Play EMS for an incredible number of vehicles…
Read MoreHow should I wire up my Innovate LM-1 or LM-2?
Begin by following the ‘Quick Start Guide’ that comes with the LM-1 / LM-2. In addition, DIYAutoTune recommends: If you are simply using the LCD display on the LM-1 / LM-2 to tune your car you have nothing different to do. However, if you are routing an analog output from the LM-1 / LM-2 into…
Read MoreThere are several ‘optional’ or ‘choice required’ steps during assembly of the PCBv3 MegaSquirt units, how are the DIYAutoTune ECU’s configured?
MegaSquirt-I EMS’s are setup by default as a fuel only EFI controller running though they are running the current stable release of the MS1/Extra firmware. These are configured to be triggered from the (-) negative terminal of the coil by default. It is fairly easy to convert them to be triggered from a Hall/Optical/Points trigger…
Read MoreWhere do I start?
Read. Then read some more. If you skip this step you will be asking questions later that you could already know the answers to. We’re always glad to help though as this is a DIY based system some of the burden does fall on the user to do their homework, the big dogs charge an extra…
Read MoreMegaSquirt DB37 Connector, Grounds, and You
There are a few different MegaSquirt wiring diagrams floating around the internet. For the most part, they’re all the same. However some vary in regards to ground pin locations on the MegaSquirt DB37 connector. Proper grounding is one of the keys to a successful installation of any EFI system, so we want to help remove…
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 Setup TunerStudioMS
Before beginning the procedure this article outlines, please be sure that that you have already downloaded and installed our software package to your tuning laptop, and you have installed firmware into your MegaSquirt ECU. Step 1. Plugging up. If you just finished installing firmware to your MegaSquirt ECU, you probablly are already powered up and…
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