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Post Info TOPIC: Alternative ECU Application


Newbie

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Alternative ECU Application


I'm looking into what it would take to convert a single cylinder (500cc) two-stroke engine to port injection and am interested in using a Suzuki ECU or whatever is best to manage the fuel and ignition of the engine.  I have some questions regarding the Suzuki ECUs as I have no experience with them however they are what I've read the most about so far.  I know there may be alternative solutions but I'm trying to do this on a budget so I'm looking at all avenues and would appreciate any advice or concerns regarding the conversion. 

In your opinion what ECU would be best for this application.  Ideally I need to control one, maybe two injectors depending on if I can find an injector with the proper flow rates or not.  I believe I can but I'm not 100% sure yet.  I also need to control ignition timing.  If I could input an EGT sensor and be able read and maybe tune off that it would be helpful.  The next best thing would be an O2 sensor.  I may also be interested in running an electronic oil pump off of the ECU which would need to be controlled in relation to RPM.  All that may be a bit far fetched given the available options so at a minimum I need to control fuel flow and ignition timing.

My big questions so far:

1.  Since I'll only be running one cylinder will the ECU give me error codes or troubles since the others won't be connected?  Will the same thing happen if I don't have a fan or other accessories?

2.  Is there any way to input other devices such as an EGT guage? Or electronic oil pump?

3.  Once running can the Suzuki stator/charging system run the bike without a battery?  The idea to only use a battery upon start up has crossed my mind.  Adding a battery is not a big deal or alternatively maybe using a higher output charing system would be a solution.  I know pretty much all two-stroke snowmobiles are batteryless efi now so maybe a stator from a sled would be an option?

4.  I've thought about oil injecting the bike.  I think I could use a diesel injector and run it off one of the injection channels that is not in use.  Are there any potential problems with this other than tuning?  Could the oil pump possibly be run off an injection or ignition channel (using an oil injector would not be applicable in this scenario)?

I know these are fairly general questions (and maybe some of them dumb) as some of the ECUs vary in complexity and tune-ability.  From what I could tell an ECU from a Hyabusa or GSXR may give me the most options for tuning?  Also don't worry about injectors not being the right size, I know how to figure out what I need so that's not an issue.  I just want to know overall if the Suzuki system would work for my application and how easy or much of a pain it would be to make it work.

At this point I'm open to all other systems and ideas so please don't rule anything out.

I think I'll leave it at that for now and see what you all have to say.  Thanks for your help!



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Senior Member

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For a single cylinder i would look at "MicroSquirt" from Megasquirt, or if you use some other ATV or Dirtbike ECU thats also hacked.
Good for small amount of sensors also wich i can imagine its on a 2-stroke.Small in size and waterproof ecus.



-- Edited by Twice on Friday 10th of February 2012 11:13:52 AM

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Senior Member

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In my opinion it would be better if not cheaper to fit an aftermarket type Ecu.
The intricacies of modifying a four cylinder four stroke Ecu , altering the ignition timing , pickups , sensors outputs etc would be a mamoth task.
The Ecu would in principal have to be re-developed.
There are many cheaper aftermarket Ecu,s out there like Dicktator , Megasquirt , Gotech and of course my choice - MoteC , which is a bit pricey.

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Guru

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also Look at AEM, DTA, ViPec, Link. as cheaper alternatives to motec , you may need to talk to the sellers to find which will suit your needs
The Suzuki ecu that comes close to what you want would be the gen 2 busa, using editor , but you still need to configure the pickups etc as a 24-2 crank signal and a 1 pulse/2rotation cam signal , bit hard on a 2 stroke , and where the configuration adjustability of a standalone would be better .



-- Edited by Maj750 on Saturday 11th of February 2012 12:14:00 PM

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Newbie

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Say I just used it for the bare minimum and didn't intend to change anything. For example if I got a Ninja 650R or Suzuki SV650 ECU with two injector channels and used one or both for injection. I could also still change ignition timing. Would it work or not? I understand the fuel map will be way off so I'll have to make my own map to start with but I should be able to calculate a map to get it to run.

Motec only wanted $5600 for an M400 today and that even included my student discount! For that bargain I nearly bought two!

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I just had another look at the Mega/Micro Squirt systems and must've been a bit daft the first time I read about them as I didn't know you could do ignition with them as well but clearly you can so that may be a possibility now. As suggested I will have a look the other stand alones as well. Thanks for your help thus far.

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Senior Member

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Microsquirt is in the right price range, think i read somewhere that they used them on 2-stroke jetskis also etc..
And i think you could alter most of setting for sensor etc, and how many cylinders and type of ign coils etc.

If it works, certainly worth the $, not tried it myself though.

Keep us updated and let us know wich you go for.

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