This is the other project I'd like to do to the bike; the part finally showed up today! Here again, with my experiment reasons...
Theory: There's no point in doing other mods if you can't control/adjust the fuel and/or ignition.
Reason: Cause it needs to be hacked, damn it!
I found a spare ECU for 30 GBP shipped, from a guy in the UK who was parting out an SR50 via eBay.
I've read the other posts on other people's plans on hacking the ECU. I've also shown this and the Aprilia Gameboy cartridge to my friend J, the smartest man I know. We tune fuel injected cars all the time, so this can't be that much more difficult. My own car as well is running on a Link+ stand alone engine management that we've tuned.
I downloaded the service manual and showed him the wiring schematic for the DiTech, that due to the amount of sensors (or lack thereof) we agreed that the SR50 is considered "Just barely fuel injected"
So I showed J the Aprilia Gameboy cartridge...
Me: So this is what's used to connect to the ECU *pointing to the screen*
J: What the hell is that?
Me: For whatever reason, you need a Gameboy for it.
J: So... what exactly does it do?
Me: It can scan error codes and clear them... and load pre-done factory maps if you have a Gameboy you can connect USB.
J: So... it's a scantool ... ?
J: ...and how much is it?
Me: 230 Euro...
J: Well... fuck that shit.
So our motto now is, 'Fuck the Gameboy!' We're gonna do this Honda style. If it's 'barely' fuel injected, it should be a very simple design, with average to low-end computer components in the ECU.
By Honda style, we're going to de-saulder the main chip and saulder in a socket in its place. Our chip burner not only burns data onto chips but also reads data off of it. We're gonna make several copies of whatever maps' on there, and I also have the newer versions downloaded to, and see if we can make anything from the data.
Now... the hard part, where to find software that turns a fuel and ignition map into a .DCB file... hmmm...
Oh, and here's a side of the ECU no one shows. There's a rubbery cover siliconed (or something) to the casing to keep debris out. I predict it will not be fun, nor clean, taking that off.