Fuel Injection Conversion

[jaysihn]

Which sensors you used
Tune (how you mapped it assuming they are using maps)
Pros and cons to the squirter thing (anything you see missing from what's available already)
Any custom software you may have done for it
Robustness (after you have a year or so of time riding it)

The minimum sensor package is:
Intake air temp
coolant temp (motor temp)
manifold air pressure
throttle position sensor
ignition trigger


both temp sensors can be pretty much any 1 or 2 wire thermistor you can find. megasquirt lets you calibrate them.

the MAP sensor comes with the megasquirt kit and should work for almost any application including turbocharged ones.

the tps needs to be a 3 wire type and again almost any should work because you can calibrate them for the megasquirt comptuer.

when you build your board up, you have options along the way depending on what type of ignition trigger you are going to use. basically when they designed it they put several circuits on teh board and allow you to populate whichever one you need and activate it with jumpers.

you can add both an oxygen sensor and a knock sensor to allow for better tuning and automatic VE corrections while driving.

Once I get my wideband O2 sensor installed I'll be able to finish tuning and I'll post up my fuel maps for people to use if they decide to try this project.

There is such a huge amount of information avaible on the megasquirt project from www.megamanual.com and www.msefi.com that getting the computer to work right is actually one of the easiest parts.

[drhach]

How many amps does it all draw? Are you having any issues with charging after you feed all of that stuff?

[jaysihn]

its still to ealry to tell. I haven't driven it more than a few minutes at a time.


I'm guessing with the stock lights on it might be a problem. I might have to switch over to LED's to swing the balance back towards stock.

[drhach]

Fuel injection

Keep us posted (no pun intended). I've got a Megasquirst sitting in my toolbox. It's kind of low on my list of priorities though. It seems that on these older bikes, alternator power is the biggest hinderance. Not impossible to overcome, but an issue. I know there are some people that have rewound their alternators to get more output.

[ArttuH]

Most significant power consumers in injection system are fuel pump (3-6A typically) and heated O2 sensor (2-3A) if you use one. The rest of the system takes quite little power. Or actually injectors may take up to 4 amps under full load at maximum rpm but during normal driving they take much less.

As far as I know my 1100 have a 250W alternator and it seems to be enough for injection and stock lights. Altough it seems to be on the edge since it can't keep full charging voltage if I turn grip heaters on

[terbang]

I don't see any issues on a normal healthy charging system for the fuel injection. This project has certainly whetted my appetite for something on my 1100. I watch with keen interest.

[jaysihn]

i think my fuel pump is under 2 amps.

my next project is going to be a digital gauge to show all my sensor readings and I think I'll put an amp-meter on it.

[ArttuH]

Wow, under 2 amps sounds very low, very nice. Does the pump have integrated returnless pressure regulator?

[jaysihn]

its the intank pump out of a 2005 GSXR. I mounted it in a small auxiliary tank with hose barb fittings to connect the tank to the fuel rail and gas tank.

I have the return from the rail going to the auxiliary tank right now but I think the gas is getting way too much heat soak like that so I'm gonna have to figure out how to send the return to the main gas tank instead.

[drhach]

Hey Jaysihn, I was wondering, are you still a student at Purdue? It's nice to see an ME doing real world stuff. Are you doing FSAE too? I went to UIUC, I considered Purdue but UIUC made a better offer.

[jaysihn]

nope I graduated in Dec. 2006.

I didn't do any of formula or mini baja stuff. I was really excited about it freshman year but never actually got into it. I joined the Purdue Offroad Club when it was still pretty young and got involved in that where we actually worked on our own offroad vehicles and in my opinion did a lot more interesting stuff.

[drhach]

Good to hear it. I actually got to do the Formula team for my senior project. I worked on the engine team and I learned a ton of stuff. Namely that I didn't have anyinterest in working in the automotive field. I got to collaborate closely with an engineer at Ford when I was doing the CFD work on the intake. All in all, it was the best thing I ever did at that school. Keep doing good things. Keep us updated. I have a megasquirt in my toolbox that I can't figure out which bike I want to put it on. If I ever get my GS going, Maybe I'll use it on that one. GO ILLINI!!!

[AOD]

Are you doing FSAE too?

GO HUSKIES! :P

I did Formula FSAE three years at NIU - not just for my senior design. I miss that stuff, but everything I learned about fuel injection and engine management I learned there. Always thought about putting fuel injection on an older bike...but I'm keeping it for something newer.

Good luck with your project!

~Adam

[Nerobro]

Nice job. I wanna see a dyno run from that thing. :-)

[AOD]

Add EFI usually doesn't add horsepower. If it's jetted lean on the carbs, fine-tuning the fuel map may slightly improve horsepower...but you're not going to see significant changes.

Just throwing it out there...