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Old 03-13-2006, 09:34 AM   #1
stickboie
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Default Megasquirt?

has anyone heard of or installed the megasquirt 2 into a wrx? i'm thinking about taking out my UTEC and repacing it with the megasquirt 2. i was thinking about the AEM stand alone system but not for that price, its like $2000 or so. what do you think?
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Old 03-13-2006, 03:42 PM   #2
Freon
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I don't think anyone has gotten one running on a Subaru. I don't think I would bother because the Megasquirt system isn't that smart. Last I checked it only did batch fire and no spark control at all, which is a huge downgrade for you already. Plus it may take quite a bit of adapting or changing out sensors for compatible equipment.

What about a Hydra or a reflash?
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Old 03-13-2006, 04:37 PM   #3
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I've only heard of MS on older EA series Suby engines.
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Old 03-13-2006, 07:48 PM   #4
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I'm in the process of changing over to Megasquirt for fuel control on my '02 RST. I'm doing it because the current setup of using piggyback to account for nearly double-size injectors has various issues like poor cold-start and over-rich on tip-in.
The current 'main-line' for MS is the MS2 processor on what they call a v3 main-board. With this you get two injector drivers that can each drive at least 4 injectors, but yes, you only get batch inject. There is (quite advanced) spark control, but only a single output which needs to be mechanically distributed, so effectively there is no solution for COP wasted spark systems (terminology? I don't know much about spark systems).
The reason I'm interested in it are:
- It's cheap
- It's open source (I plan on tinkering a lot)
- It can run closed-loop fueling over the whole rev/load range with wideband O2 sensor (I'm using a TechEdge WB02)

I'm yet to find out what disadvantages I'll find from bank fire. My gut feeling says if any, they'll only be idle or low load, since when you get to high load with over 50% open time, what does sequencing really mean anyway?
If I find bank fire too much of a problem, then I might be working on extending the code with another two injector drivers to give sequential fire. I think if this was done, then MS is a viable option for fuel control (esp with WB closed loop), but is nowhere near a spark solution.

Mark.
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Old 03-14-2006, 03:01 AM   #5
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im using megasquirt on an ej20g with edis ignition. So far its been going great. megasquirt not smart? lol sounds like you need to read up.

Batch firing is fine. Its used by companies because it gets slightly better emissions down low. Im sure if you are a hardcore tuner, you can use sequential fire to your advantage for high states of tune.


MS2 has a ton of new features too.

-Ryan
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Old 03-14-2006, 09:13 AM   #6
stickboie
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what kind of system is Hydra?
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Old 03-14-2006, 12:34 PM   #7
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Quote:
Originally Posted by stickboie
what kind of system is Hydra?
Do a search
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Old 03-14-2006, 09:44 AM   #8
forced4
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The latest SubySport magazine has an article about 'squirtin' a RX.
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Old 03-14-2006, 10:30 AM   #9
stickboie
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i saw that but thats an old car. i don't know if its going to be that easy on a 02 wrx with a vnt turbo? i'l lhave to look into it some more. i still like the aem ems b/c i know it should work, but i dont like the fact that you cant pass edmissions with it and not to mention the $.

i dont know if any stand alone system will pass anyway?
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Old 03-15-2006, 08:46 PM   #10
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Quote:
Originally Posted by stickboie
i saw that but thats an old car. i don't know if its going to be that easy on a 02 wrx with a vnt turbo? i'l lhave to look into it some more. i still like the aem ems b/c i know it should work, but i dont like the fact that you cant pass edmissions with it and not to mention the $.

i dont know if any stand alone system will pass anyway?
Old eh? stock it came with an adaptive and learning ECU, full boost control that it could define, and all kinds of other goodies. Plus its fast.

ZERO standalone ECUs will pass any OBD2 emissions.

btw: I am said person-car owner-tuner of the MS-2 system featured in SubieSport.
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Old 03-14-2006, 12:09 PM   #11
Freon
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Without OBD-2, I don't think you'll pass any sort of emissions check. That's usually the first thing. Unless you can somehow get a stock ecu in there and fake it out enough to say everything is a-ok. I don't know of any standalone that offer OBD.

I'm waiting for someone to create an OBD-2 dummy device that does nothing but send all the readiness codes and no failure codes... They'd make a bundle before the EPA came and shut them down and threw them in prison.
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Old 03-14-2006, 01:01 PM   #12
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Run any EM in parallel with stock to keep OBD-II...

As for the MegaSquirt, I'm closing in as well, 4 wires short of testing my trigger-reading code (12+, Gnd, Cam, Crank) - I'm running on the MS-I platform with MSnS-E firmware though since I need wasted spark now and don't really want to use EDIS for ignition (MS-II only has 1 ignition out). There is work out there to read off the WRX trigger, but MS-II don't have the output to drive the stock COP directly. If you're not in a rush, MS-II could eventually fill your needs. If you know a bit of coding and feeling adventurous, maybe you can code up what you need. If you don't need ignition control right now, MS-II should be able to run your WRX. The main advantages I see with MS-II over MS-I is the precision for injector pulse width (16bit vs 8bit), and the expansion via CANbus. The other way I see an existing firmware (MSnS-E) that provides a lot of features that people want (up to 6 cyl COP, Boost Control / Water Inj, yada, yada). Sequential Injection is not available until the Router Board (expansion board running over CANbus) because there isn't enough timer channels on the main board, same goes for individual spark. At least the MS-II CPU is a daughter board plug into the mainboard which means you can start with MS-I and just buy the CPU upgrade (and rewire a few things)
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Old 03-14-2006, 04:03 PM   #13
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Another DIY-type engine management system is at http://www.vems.hu/wiki/index.php?page=ProjectPage.
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Old 03-14-2006, 04:33 PM   #14
kgb
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Lightbulb

Almost looks like a fork from MegaSquirt early on and now gone on to use different CPU but almost the same tunes (references of MegaSquirt AVR, MegaTune, MegaTunix...). Looks to be even more Alpha status than MegaSquirt although the baseboard's potential is higher due to the number of I/O available on it (MegaSquirt went with modular boards with backward compatibility)
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Old 03-14-2006, 07:14 PM   #15
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An attractive feature of the VEMS is that it incorporates knock detection via the TPIC8101 chip. Properly programmed, that chip provides knock detection that is an order of magnitude better than that of the Hydra.
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Old 03-14-2006, 07:22 PM   #16
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After reading up on it, it looks like that project has been there for quite some time (2+ years), with a lot of info scattered all over their Wiki, less marketing and definitely more hard core DIY with more features for higher price. You know, if I can have an Autronic for less than $1K USD working with my stock components I would have gone there instead of looking at MegaSquirt and VEMS. I'm so dead....
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Old 03-15-2006, 10:02 AM   #17
stickboie
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is their any diagrams out there that can show me how to go about doing this? i don't know much about tunning but i'm slowly learning about it. all in all it sounds like it will work great, but is their any downsides to the MS/MSII system? i've been hearing only good things about this system, but with any EM system their has to be somthing someone dident like about it?
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Old 03-15-2006, 01:12 PM   #18
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The only downside right now is that it's nowhere near plug and play, if you are one of those electrically/mechanically inept, it's definitely not the system to install. Check out www.megasquirt.info - fuel only shouldn't be a problem, but doing ignition requires mechanical changes (or code changes)
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Old 06-03-2006, 08:26 AM   #19
93L-RS
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Neat! I've read that article like 6-7 times already. good stuff.
I'm going to be doing a 1.8 turbo this summer, and I was thinking about about using the megasquirt for my EMS.....
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