My EFI 'kit'

[fred]

That's interesting. I'd love to hear more...

[The Buddha]

Oh no  not EFI, that's gonna put Buddha out of business............... just kidding Buddha 
Good luck JeffD 

Oh yea ... what will I do then ...
Cool.
Buddha.

[hotrodstu77]

dont fret buddha ill still buy your jet kits

[The Buddha]

Dude ... its $250 for this EFI ... and 20 bucks for a jet kit. I can get carbs to run as well ... the problem is ... many people cannot. I figure I'd start to see a lot of hacked up GS'es in the near future where they tried to EFI and they broke somehitng ...
Cool.
Buddha.

[Weston]

Hey, does it run off of tps, map sensor, or oxygen sensor?

[88five-oh]

Oh man thatd be awesome! Will it be chokeless or will a choke still be required?

[JeffD]

Got a little more buzz than I thought it was going to get!  And no my plan is not to put buddah out of business; plenty of people will still stick with carbs.  I just thought it would be cool to get a bunch of GS's on EFI easier than it is now; and heck its been fun researching and building.

And to answer a few questions:

No usb programming:  The idea is to make it 'garage' tunable so anyone with a screwdriver can tune it.(I am using linux to program it if that counts  )
Yes there is a TPS
I plan on making the PCB "expandable" too, to be able to add whatever in the future. (or custom apps)
Haven't decided on a 'choke' yet ($2 switch or have a temp sensor and automate it....man vs machine)
From the looks of it the airbox will have to be replaced; a k&n lunchbox will fit the bill (and only $30)
The chip can actually be reprogrammed via 6 pin terminal for firmware upgrades (but not intended for tuning).


Big hurdles ahead:
Fuel Pump
Fuel Regulator
Fuel Rail/injector layout

You gota trust me that I'm trying to find the least expensive parts to build it....the auto industry well...stinks.  For example, I've been searching for a pump/regulator combo for around 40-45psi simple right? no...Almost everywhere I search they have to have a 'specific vehicle'...I dont care what it goes on, I just want a pump.  OR the damn things are inexpensive but designed for HUGE engines...and forget motorcycle fuel pumps.  OEM pumps run $250+....  Seems like I've spent 80% of my time just trying to find a pump/regulator at a decent price.  I think I found a pump/reg but just those are half the cost...

I should be ordering hardware soon to start building a prototype while I keep working on the program.

-Jeff

[The Buddha]

Tee hee ... when the people who suggest that the bikes burnt its valves due to hot oil get their hands on this, I am going to get a lot of bikes that dont run ... teeeee heeee ... buy em cheap, then buy carbs cheap, hijack the injectors, fit it on my GS and sell it all for high $$$ ... teeeee heeeeeee ...

Either that ... or ...

These work so well everyone converts to it, and they need better wheels and forks and braces etc to handle the power ... and I make those and make a killing. Win win ... booya.
Cool.
Buddha.

[natewesselink]

man if you can get that thing runnin right ill be first in line to get one

[Darkmyst]

Oh okay, screwdriver tuneable, thats cool by me.  I just didn't want to have to hook it up to my windows box to do anything with it 

As for the choke I like the idea of a switch better than an automated sensor.  I don't trust sensors.  (This coming from the guy that wants to rip out his car's entire dash and replace it with a car PC system hooked into the ODB2 port.)

[arbakken]

do it with a temperature sensor, it would aid driveablility and make it easier to start and run

[TheGoodGuy]

WAY COOL!!!

I want one!

[EdChen]

Maybe you could have some simple tuning through RS232, then pretty much any of us could connect it up and do a little tuning, at least i'd throw on space for a max232 on your pcb, maybe we can put on some data logging as well!

[Chanse]

I dont think this guy wants to get that elaborate. with data logging and all, Its a nice thought, but I think his main aim is to get a CHEAP, OPERATIONAL, SLIGHTLY TUNABLE EFI. Not full stand alone race ready tunable.

[EdChen]

Yeah, that's true, I'm sure getting it working will be the biggest hurdle, the bells and whistles can be worked on after the fact just as easily.

[JeffD]

Yeah, I can go load it up with 15 sensors, 5000 lines of code and have a super tuner efi kit...but they have those already for $700+  The chip family I am using is the Atmel AVR which is being written in C so 'IF' I wanted to move up to a bigger chip it would only take about 30 seconds to have the complier make it for the new chip.  But, yeah let me get a prototype working and see if it is suitable or needs more electronics. 

[JeffD]

Update 11/02/08:  Design progress overall 40-50%

Tasks complete
Fuel injector drivers tested.
Trigger circuit tested.
Main program done. (no FI map yet)

Tasks upcoming
Test fuel injectors
Design/prototype fuel pump driver
Layout fuel system and order final parts
Start FI map



Below is an image when I was testing the trigger for the injectors.  Final board size should be smaller than the one in the picture.
http://i150.photobucket.com/albums/s95/ddphoc/DSCI0011.jpg

[Paulcet]

Awesome progress Jeff, thanks for keeping us up to date!

[The Buddha]

Used carburetors bought here.
89-00 - $1 shipped.
01-02 - $.25 shipped.
04-09 - $.50 shipped.
Good shape only, no junk. And very importantly, no fatties. Send photo first.
Cool.
Buddha.

[starshooter10]

Very cool!

if your skiming on the sensors wont it run like crap with the changes in alt?

only reason i'd want a EFI GS is if i started taking it on raod trips...

last time i took my firebird to OR (im in CA) it was almost unable to make it over the border..
.
you go from sea level (at my house) up to several 1000' (3k+)

and i cant imagine a small 500CC twin doing anybetter then my V8 350