dhallilama
12-31-2007, 05:55 AM
pardon me if what i write below is confusing or is a haze of complete and utter incomprehensibleness... i'm pretty tired, and kinda just thinking out loud...
the ECU is GM part number 1227749 (now has a Delco PN, too)... they were used in quite a few vehicles... all OBD1... syclone/typhoon, turbo sunbird, quad4 vehicles, etc...
the ECU can be had pretty easily for ~$50. they're actually available from NAPA and GM dealers as well (although i have yet to verify the price there).
i've been thinking about it for a while... lots of openly available information on 'em. lots of people seem to be using them in other applications... 4cyl turbo dodges, porsches, misc V8s, etc... pretty commonly hacked.
high resolution, fuel and spark, use a 2 or 3 bar MAP, built in "limp" mode (guessing if the injectors are sized ok), wastegate control, knock detection (with the sensor of course), fan control...
possibility of 16 multiple maps with a multi-bin switcher... ~$65 new, with the dash mounted remote... switch binaries on the fly. low boost, high boost, ethanol, valet mode... damn... possibilities are endless. ok, so there are 16... and 16 isn't exactly endless... but more than i can think of uses for at the moment.
tune-able by laptop.
a lot of commercially ($) available ECU tuning software, some freely available also.
tons of diagnostic/logging software out there.
with an eprom emulator, can be tuned on-the-fly (then later burned to eprom)
ok, so you would need to pull/burn/replace the eprom when doing changes...
base maps, well... you'd likely be f'ed with getting something ready to run off the bat... maybe pick a map from one of the diy-efi guys as a start?
lots of tuners are familiar with the ECU and the tuning software... meaning if you were so inclined, it probably wouldn't be that difficult to find a good shop to dyno tune it for ya.
these ECUs have been used in performance apps for a while, so plenty of software/hardware is out there... meaning it can be found used for pretty cheap... even the damned thing which i can't remember it's name, but holds multiple maps/programs and can be switched on the fly. damned brain... the more beer i douse it with, the less it remembers.
as a side thought, the GM cruise control would be an easy implementation with this...
Motorola 68HC11 processor, so no... not the fastest (8mhz??? i forget), but should be easily enough for anything thrown at it.
i've got an eprom eraser and burner, an eprom emulator... ALDL (GM OBD1) connector... a few of the things that'd be needed.
if ya had to buy everything, it probably wouldn't be a cheaper option than megasquirt... but it's another option, and one that's pre-assembled and easily available should you need another one because you spilled your beer on it.
more to come when i've rested and re-beered myself.
the ECU is GM part number 1227749 (now has a Delco PN, too)... they were used in quite a few vehicles... all OBD1... syclone/typhoon, turbo sunbird, quad4 vehicles, etc...
the ECU can be had pretty easily for ~$50. they're actually available from NAPA and GM dealers as well (although i have yet to verify the price there).
i've been thinking about it for a while... lots of openly available information on 'em. lots of people seem to be using them in other applications... 4cyl turbo dodges, porsches, misc V8s, etc... pretty commonly hacked.
high resolution, fuel and spark, use a 2 or 3 bar MAP, built in "limp" mode (guessing if the injectors are sized ok), wastegate control, knock detection (with the sensor of course), fan control...
possibility of 16 multiple maps with a multi-bin switcher... ~$65 new, with the dash mounted remote... switch binaries on the fly. low boost, high boost, ethanol, valet mode... damn... possibilities are endless. ok, so there are 16... and 16 isn't exactly endless... but more than i can think of uses for at the moment.
tune-able by laptop.
a lot of commercially ($) available ECU tuning software, some freely available also.
tons of diagnostic/logging software out there.
with an eprom emulator, can be tuned on-the-fly (then later burned to eprom)
ok, so you would need to pull/burn/replace the eprom when doing changes...
base maps, well... you'd likely be f'ed with getting something ready to run off the bat... maybe pick a map from one of the diy-efi guys as a start?
lots of tuners are familiar with the ECU and the tuning software... meaning if you were so inclined, it probably wouldn't be that difficult to find a good shop to dyno tune it for ya.
these ECUs have been used in performance apps for a while, so plenty of software/hardware is out there... meaning it can be found used for pretty cheap... even the damned thing which i can't remember it's name, but holds multiple maps/programs and can be switched on the fly. damned brain... the more beer i douse it with, the less it remembers.
as a side thought, the GM cruise control would be an easy implementation with this...
Motorola 68HC11 processor, so no... not the fastest (8mhz??? i forget), but should be easily enough for anything thrown at it.
i've got an eprom eraser and burner, an eprom emulator... ALDL (GM OBD1) connector... a few of the things that'd be needed.
if ya had to buy everything, it probably wouldn't be a cheaper option than megasquirt... but it's another option, and one that's pre-assembled and easily available should you need another one because you spilled your beer on it.
more to come when i've rested and re-beered myself.