Megasquirt EFI and Ignition Project

[81xsproject]

Someone previously mentioned in this thread that it could be done with stock PU's, but I want the GM DIS system. So, I don't know about that. As for tuning tables, I would be happy to give them to you but you have to have you required fuel value set up the same (I think). If you use the use the required fuel calculator in MegaTune for 67 ci (1102cc) you should get a required fuel value of 8.8 IIRC. Or you could just manually enter that value. You also have to be set up for the same number of injections per cycle and using the same flow rate injectors and I am sure there are some other things. I could send you the whole tune and you could just go in and change your ignitions settings to use the stock PUs. Everything else would be a really good starting point. I HIGHLY recommend dropping the $40 for the pro version of Tuner Studio so you can use the 'Live' tuning feature.

[Science Guy]

Reluctor

Is it possible to just use the stock pickups rather than making the new reluctor wheel and pickups? They are sending a similar signal to the ICU any ways. Can't Megasquirt just use those signals? Also, do you have a copy of the tuning files used on your 81? I'm doing this to a 79 and it should be just about the same.

[natemoen]

Man I love this idea. It just everything it takes to get it done that makes me not want to do it.

[81xsproject]

Sorry, I didn't get back to your question, sooner. I don't know how I didn't see it. Anyways, I am currently running the elusive 99-00 Busa pump like Shappers. This winter, I will be trying out the inline MSD pump as part of getting the airbox back in. For a real project update, I ordered an PMW idle valve from one of the old 3 cylinder Geo Metros (1000cc). With the addition of brainless engine starting (no choke, levers, cables, idle screw adjustment, or throttle use) I will finally have ALL the conveniences of modern EFI. The unit is very small, and I intend to mount it in the airbox between #2&3 intake boots. I will run the 'out' into a vacuum line to the intakes. Then I will have to do some testing and tuning.

[clcorbin]

81xsproject,

What fuel pump did you finally end up going with? I'm pushing forwards to converting my 79 over and that pump issue is DEFINITELY the biggest hurdle!

[Guy_b_g]

Correction to last post...the return/output line went to the right side of the tank, not back to the left side....oops

[Guy_b_g]

Here is a picture of how the Weber-Marrelli fuel pump on my Guzzi was mounted.

http://i430.photobucket.com/albums/qq26/guy_b_g/dscf0011-1.jpg

The fuel line came from the left side of the tank, ran under the backbone of the frame and down to the pump, then back up to the backbone and to the left side of the tank, where it went into a regulator/return flow fitting in the place where a second petcock would be, and the main line split off to the fuel injection (also a Weber/Marelli system). You shouldn't need all the extra plumbing unless you planned to make the tank airtight.

Perhaps there is room for the same type of installation higher up on our bikes if you use the area near the front of the valve cover where the horns on some models go?...just a thought.

By the way the fuel pump on the Guzzi was stock, but I added the custom made mount with cooling fins.

[Guy_b_g]

You might want to check this one out...seems reasonably small...specs are good...looks easy to mount...don't know about current draw.

Trick Flow inline fuel pump:

Free Flow Rate 43 gph
Inlet Attachment Hose barb
Inlet Quantity Single
Inlet Size 5/16 in.
Maximum Pressure (psi) 85 psi
Outlet Attachment Hose barb
Outlet Quantity Single
Outlet Size 5/16 in.
Quantity Sold individually.

$84.95

ebay#220405387775

[Thee_oddball]

That only goes to 15 psi. EFI systems need about 34 to 45 psi......

ahhhh ..thnx

[Shappers]

Sorry to hear about the pump not working out, hopefully you will come up with something else.

I was thinking that if I did mine again I would make a small fuel tank the same size as the battery and then fit a Suzuki in-tank pump to the end of it. I would then relocate the battery.

It would solve the return line to the tank problem, getting fuel from both sides of the tank when nearly empty and the in-tank pumps are cheap(er) and plentiful.

I had a nightmare tying to find a place for my external pump, in the end there was only 1 place and in 1 orientation where it would fit. Compact is not the word

[DiverRay]

is this closer?
http://cgi.ebay.com/ebaymotors/Walbr...3A1|240%3A1318

That only goes to 15 psi. EFI systems need about 34 to 45 psi......

[Thee_oddball]

is this closer?
http://cgi.ebay.com/ebaymotors/Walbr...3A1|240%3A1318

[Montreux_Blue]

Go to your local auto parts store and see if they can find you a cheap small car inline fuel pump, something like an 84-85 RX-7 GSL-SE that had a fuel injected 1300cc with inline fuel pump. Or even a junkyard if you want a cheap one to experiment with.

[cowboybob998]

Dont know if this will help but I was reading on a gold wing site last night and the were talking about elect. fule pumps for the old gold wings that have a mech. fule pump, any way some guy come up with an idea of useing a vacume pump like the ones on snow mobiles, would this do you any good ?

[81xsproject]

Well, you may have just read it, but you missed some details. The challenge with the fuel pump, is finding something small (but in my case not too small), low current draw, and most of all, INLINE. Thanks for the link, but that pump, like nearly all motorcycle pumps, is in-TANK.