VDubber

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Group for anyone interested in building, installing and tuning aftermarket EFI systems. More
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  • Placed my order for the rest of my Speeduino components, including the Arduino Mega. Hopefully the parts should be here in a few days and I can get on with assembling the board. From what I understand I still need to run an external controller if I want to run wide band as the Speeduino only has... Placed my order for the rest of my Speeduino components, including the Arduino Mega. Hopefully the parts should be here in a few days and I can get on with assembling the board. From what I understand I still need to run an external controller if I want to run wide band as the Speeduino only has on-board support for a narrow band. Managed to find a suitable controller for $35 -  https://www.14point7.com/products/spartan-2-oem The same company also offer an open source controller as well, should you want to tinker. The open source version includes an LCD display so that you can set it up as a real time display / dash gauge / LM2 substitute.

    My coolEFI board turned up just after my last post but it's just sat there waiting for me to pull my finger out and get on with installing the engine in the bus. I've also picked up some other goodies - A small hand held scope for helping diagnose signal issues. A freescale USBDM bootloader. For flashing firmware and a few other Megasquirt units.

    I've been toying with the idea of buying into a Megasquirt dealership as there's not really anyone doing it here in Aus but it's a bit of an up-front investment, and I'm not 100% convinced at this stage. Will have to see.
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  • Thought I'd dig out the ECU's that I have take a photo of them and give a little bit of info about each one.

    First up the onion board. The onion board is not really an ECU, it's more of a signal processing board. This board is designed to work with the FreeEMS code and to be used as a piggy...
    Thought I'd dig out the ECU's that I have take a photo of them and give a little bit of info about each one.

    First up the onion board. The onion board is not really an ECU, it's more of a signal processing board. This board is designed to work with the FreeEMS code and to be used as a piggy back board to a MC9S12XDP512 processor board. I suspect that it would also work in LibreEMS as this is also MC9S12XDP512 based being a branch from the original FreeEMS code.

    The S912XDSYS is a MC9S12XDP512 processor mounted on a convenient breakout board that is also coupled with a clock crystal and BDM interface to allow communication with an external boot loader. This board in conjunction with the onion board is typical of the hardware that is available for the FreeEMS / LibreEMS projects.

    In short the MC9S12XDP512 is a processor that has a variety of I/O that can be programmed and configured to work in a number of different ways. The actual use of each of the I/O channels requires external componentry to ensure that the signal is converted into a format that the MC9S12XDP512 can read. This is known as signal conditioning. Boards such as the onion board simply house all of the signal conditioning required to interface with the typical components that you would need in an EFI install on one easy to integrate board.

    The MC9S12XDP512 is very flexible in that you can easily write code for it and it is relatively simple to create hardware required for signal conditioning the I/O to work in the manner that you want. Of course simple does not necessarily mean quick or easy which is why one of the solutions already available like the onion board is a good bet.

    The small boards are more signal conditioning boards. These are VR signal processors that take a crank trigger signal and output a nice clean square wave.

    The two square boards are Speeduino boards. These are also signal processing boards, The main processor used is an Arduino Mega board. The Arduino is a bit slower and has a little less memory than the MC9S12XDP512 but it is a very stable platform and has a proven record. For my application it is a very good fit and it's appeal grows on me more every day.

    The Megasquirt unit is a basic V2.2 board. This is one that I built myself, it still needs to be modified to drive the ignition circuits but is functional and ready to install. This is kind of the industry standard for DIY ECU's. it's relatively cheap. It's easy to assemble. Widely supported and is still better than some of the oppositions offerings even though this particular board design is over 10 years old. Standard the board is only designed to be fuel only, however some bright spark managed to mod the board and firmware to also take care of spark. That's the great thing about open source.

    The 'MegaStim' unit is a way of generating accurate field signals so that the ECU can be tested that will function correctly. It's basically a simple timer board with outputs that mimic the crank trigger and sensors. There's another similar stim board called an ardustim that utilises an Ardunio to generate the required I/O.

    Last in the line is my DTA unit. This is an older unit that runs fuel and spark and is still capable today. This is not really a DIY board but deserves a mention.

    I've just received notification that I can expect my parcel with the coolEFI in it to arrive soon. I will post up some details when I get it!
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  • Been working through getting the EFI install on the bus ready so thought I might as well share the info here for others to find. Also got a few ECU's that I want to test with a view of supplying a basic ECU with the EFI version of my supercharger kit.

    There's a bunch of good DIY EFI solutions...
    Been working through getting the EFI install on the bus ready so thought I might as well share the info here for others to find. Also got a few ECU's that I want to test with a view of supplying a basic ECU with the EFI version of my supercharger kit.

    There's a bunch of good DIY EFI solutions out there, some are well known, such as the earlier Megasquirt MS1 and MS2 boards, some are relatively new such as the Arduino based 'Speeduino' and others are open source such as FreeEMS or LibreEMS.

    With the Megasquirt and Speeduino solutions you get both hardware and software. The hardware can be purchased as a kit or already assembled, The firmware differs drastically - the Speeduino is open source and so is free to download and use. The Megasquirt has limitations in it's usage. For example it cannot be used on any other hardware other than a genuine Bowling & Grippo board. This excludes those wishing to make their own hardware from using it.

    The open source FreeEMS and LibreEMS follow a very different model. The software itself is the main goal of the project. In each case there is no official hardware. Instead hardware has been developed by community members to utilise the software which has then been made available to the community. This is a bit weird if you ask me and also makes FreeEMS and LibreEMS less accessible than Megasquirt and Speeduino.

    Both FreeEMS and LibreEMS provide all of the information that you would require to design your own hardware and in fact encourage this, however it does place both of these solutions out of the reach of most tinkerers. There are third party offerings such as the coolEFI board available for LibreEMS and the RUS board available for FreeEMS.

    At the moment I'm getting ready to assembly one of the Speeduino boards that I have. The RUS board is on my list to assemble next and I'm waiting to take delivery of an assembled coolEFI ECU.

    The plan is to work my way through a bunch of different ECUs and will do some comparisons, this will then allow me to make a decision on which unit to supply with my blower kits.

    Up until now my favourite was the coolEFI board as it has everything I need and has a very good price point. However I've currently been waiting months for my ECU to arrive. This doesn't give me a lot of confidence.

    My current favourite is the Speeduino. It has all of the features I need and the price is very good, however it gets talked down by some of the other ECU devs due to its slower clock speed speed. There's now a bunch of people running it so the proof is in the pudding, it's working reliably on quite a few cars now so the slower clock speed does not really seem to be an issue.

    The other great thing about Speeduino is that the developer has got it to work with TunerStudio, including utilising the auto tune feature.

    Ive already got an MS1 ready to go that I built up a while back but still got a bunch of stuff to work through before the bus EFI is ready to install. One of these is the loom. My plans are to make a peg board so that I can replicate the loom multiple times.

    Will keep you posted
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  • Mick created this group

    DIY EFI

    Group for anyone interested in building, installing and tuning aftermarket EFI systems.
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