Some of the differences between the two processors can be found here. Both processors have been used with success on the e28 chassis. The two different processors available are MS1 and MS2. There is also an earlier board, v2.2, but it requires some additional work to make it work properly on an e28. This can make it a bit more robust, but it is also more expensive and is harder to modify. They are both functionally the same, but the v3.57 has surface mount components. The most current versions of the MS board are the v3.0 and the v3.57. The main thing to keep in mind is that there are versions of both the MS board as well as the MS processor itself. Megasquirt has gone through several iterations since its inception. What do all of the different versions of Megasquirt mean? Just plug in your laptop to MS, make your changes, save your tune, and you are good to go! By replacing Motronic with a MS unit you can now adjust fuel and timing maps, datalog, adjust your rev limiter, change idle speed, control electric fans, if you can think of it, MS can probably do it. You are also still left with the outdated architecture of the original Motronic system whose primary load input is a vane style air flow meter (AFM). This is not the easiest way to tune your engine. The stock Motronic can only be adjusted by altering the programming on the “chip” in the ecu. If many modifications are made to the car such as a large cam, high compression and headwork, or by adding forced induction (turbo or supercharger), or even a stock engine and you want to optimize things yourself instead of just installing a chip, fuel and timing maps will need to be modified for optimum performance. The stock Bosch Motronic system in your e28 works well for a car in stock form. Why would I want to run Megasquirt on my e28? It is also an excellent learning tool to understand how EFI works while making your car run better. It is my opinion that for an e28 application you want to control both fuel and spark. Megasquirt can be used to control fuel only or both fuel and spark. Since it is DIY, it is much less expensive than many other standalone ecus or even some piggyback computers. It performs many of the same functions as the factory Motronic unit in the e28 but allows the end user to adjust different parameters (fuel, timing, idle speed, etc) affecting how the engine runs. Megasquirt (MS) is a DIY programmable standalone electronic fuel injection (EFI) computer.
.megatune diy instrutions free#
If anyone has any questions, comments or corrections, please feel free to contact me. I hope as much of this information is as correct as possible, but I am human and occasionally make mistakes. I am hoping this can be stickied as well, in whatever forum the Beamters deem appropriate. I don't know if the FI forum is the best place for this, but felt that since most of the MS users are FI guys as well, it was fitting.
.megatune diy instrutions how to#
There are many hints in the comments included in the source code that explain how to change the existing configuration to suit your needs if you wish.Since there is a lot of interest in Megasquirt as well as a lot of people on this board either using MS or planning to, I felt that I would try to help add to the knowledge base. In most cases, users will need to modify the code to suit their particular needs, and the code is designed to make this possible for the programming neophyte. There are also examples of how to configure outputs. The analog-digital converters (ADCs) are set up on some pins/circuits, and there are some timers set up (for things like VR inputs).
.megatune diy instrutions serial#
The CAN communications, serial communications, and port set-up is completely finished. The C language code project below is designed with the novice programmer in mind, and the configuration and logic is very thoroughly commented. These can be as complex or as simple as you like.
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