twas_brillig
Jedi Knight
Offline
Here is a note that I got from a buddy who has converted his early 70s BMW 2002 to Meqasquirt electronic fuel injection. The key item of interest for us folks with the A series engines with the siamesed intake ports is his observation that the new version looks like it'll work with our cylinder heads.
We have a '73 BMW 2002 with dual sidedraft Mikuni's that might be easier to convert to EFI than tune (when it comes home the highschool body shop in a year) and he and I have chatted and done some reading on various web-sites about going to EFI on a Bugeye (using either the SUs or a Weber DCOE as the throttle body), but that'll be a few years away as well. There's also a chap who builds machined aluminum EFI injectors that replace the tops of the larger SU carbs, but doesn't have anything for the smaller SUs that we use. Can't find his web-site at the moment, but his primary emphasis is on Triumphs, mostly the TR6 if memory serves.
Any uber-geeks out there that are wealthy and would care to do all the development work for the good of LBCs?
Doug
**********************************************
Hey guys, Finally It appears MegaSquirt V3 is out. Its a daughterboard upgrade, so I'll likely be applying it to my 2002, although it looks like the case is larger then my msII case.
https://www.ms3efi.com/
Features include (with my notes)
(Based on full featured MS3+MS3X+V3.57)
Speed-density, alpha-n or MAF for fuelling calculations
16x16 fuel tables in 0.1% steps with true interpolation and movable rows/columns
16x16 spark tables in 0.1 degree steps with true interpolation and movable rows/columns
---> This is great, as you can get better tuning with higer resolutions
Wall-wetting transient fuel control for better driveability
---> also brilliant, there was initally some code added to do this (x-tau). It actually adjusts for fuel sitting on the walls of the intake.
On board datalogging to SDcard (max 333Hz sample rate)
Tuning by serial or built-in USB-serial port.
8 channels sequential fuel (hi-z injectors or low-z with external resistors)
--> Probably the most important innovation yet. Having full sequential injection means you could tune for each cylinder. Not a huge deal on our 2002s, but on some strange british non-cross flow heads (like what the minis have) this is a big deal. Also nice for race cars where you can put the injectors far away from the throttle plate for better atomization.
2 additional fuel channels (hi-z or low-z)
8 channels sequential spark (logic level output)
--> This is cool. Must mean that you can do Coil on plug rather easily.
6 channels mid current output for small solenoids or relays
2 'spare' conditioned 0-5V analogue inputs (+2 more raw)
Two wideband oxygen sensor input (external controller required)
(Up to eight widebands supported via external data capture)
GM-style stepper idle control
2 and 3 wire PWM idle control
Closed loop idle control
Closed loop mixture control - ideally with wideband
Closed loop boost control
--> All three are brilliant, and I'm looking forward to the closed loop mixture control the most.
Various boost control systems (gear, time, speed based)
Two stage variable nitrous control
2 step type launch control
--> Launch control might be nice for standing start races?
CAN communications to interconnect other Megasquirt products e.g.
transmission controller
Supports external data capture boards (e.g. for external EGT boards)
EGT data support (with external amplifier)
Staged injection
Dual fuel (e.g. LPG)
Table switching, (mainly for dual fuel use)
Water/Meth injection
Individual cylinder injector trim
--> This is kind of a big deal, mainly for
racing or siamese port engines (hint doug). I was thinking for racing sometimes you get a slightly lean or rich cylinder due to underhood conditions (like how #4 sometimes will be different because its in the back with no flow around the head to cool things)
Injector phase timing
Individual cylinder spark trim
Support for numerous OEM trigger wheel patterns.
Magnetic (VR), Hall, Opto crank sensor input
Magnetic (VR), Hall, Opto cam sensor input
I'm really kind of excited over this, it seems MS has matured quite a bit.
We have a '73 BMW 2002 with dual sidedraft Mikuni's that might be easier to convert to EFI than tune (when it comes home the highschool body shop in a year) and he and I have chatted and done some reading on various web-sites about going to EFI on a Bugeye (using either the SUs or a Weber DCOE as the throttle body), but that'll be a few years away as well. There's also a chap who builds machined aluminum EFI injectors that replace the tops of the larger SU carbs, but doesn't have anything for the smaller SUs that we use. Can't find his web-site at the moment, but his primary emphasis is on Triumphs, mostly the TR6 if memory serves.
Any uber-geeks out there that are wealthy and would care to do all the development work for the good of LBCs?
Doug
**********************************************
Hey guys, Finally It appears MegaSquirt V3 is out. Its a daughterboard upgrade, so I'll likely be applying it to my 2002, although it looks like the case is larger then my msII case.
https://www.ms3efi.com/
Features include (with my notes)
(Based on full featured MS3+MS3X+V3.57)
Speed-density, alpha-n or MAF for fuelling calculations
16x16 fuel tables in 0.1% steps with true interpolation and movable rows/columns
16x16 spark tables in 0.1 degree steps with true interpolation and movable rows/columns
---> This is great, as you can get better tuning with higer resolutions
Wall-wetting transient fuel control for better driveability
---> also brilliant, there was initally some code added to do this (x-tau). It actually adjusts for fuel sitting on the walls of the intake.
On board datalogging to SDcard (max 333Hz sample rate)
Tuning by serial or built-in USB-serial port.
8 channels sequential fuel (hi-z injectors or low-z with external resistors)
--> Probably the most important innovation yet. Having full sequential injection means you could tune for each cylinder. Not a huge deal on our 2002s, but on some strange british non-cross flow heads (like what the minis have) this is a big deal. Also nice for race cars where you can put the injectors far away from the throttle plate for better atomization.
2 additional fuel channels (hi-z or low-z)
8 channels sequential spark (logic level output)
--> This is cool. Must mean that you can do Coil on plug rather easily.
6 channels mid current output for small solenoids or relays
2 'spare' conditioned 0-5V analogue inputs (+2 more raw)
Two wideband oxygen sensor input (external controller required)
(Up to eight widebands supported via external data capture)
GM-style stepper idle control
2 and 3 wire PWM idle control
Closed loop idle control
Closed loop mixture control - ideally with wideband
Closed loop boost control
--> All three are brilliant, and I'm looking forward to the closed loop mixture control the most.
Various boost control systems (gear, time, speed based)
Two stage variable nitrous control
2 step type launch control
--> Launch control might be nice for standing start races?
CAN communications to interconnect other Megasquirt products e.g.
transmission controller
Supports external data capture boards (e.g. for external EGT boards)
EGT data support (with external amplifier)
Staged injection
Dual fuel (e.g. LPG)
Table switching, (mainly for dual fuel use)
Water/Meth injection
Individual cylinder injector trim
--> This is kind of a big deal, mainly for
racing or siamese port engines (hint doug). I was thinking for racing sometimes you get a slightly lean or rich cylinder due to underhood conditions (like how #4 sometimes will be different because its in the back with no flow around the head to cool things)
Injector phase timing
Individual cylinder spark trim
Support for numerous OEM trigger wheel patterns.
Magnetic (VR), Hall, Opto crank sensor input
Magnetic (VR), Hall, Opto cam sensor input
I'm really kind of excited over this, it seems MS has matured quite a bit.