Trying to get back into the gm's

[EagleMark]

Never saw that book before but would like to read it now... have read a few others. All have been general in nature.

[Fuse]

what ecu in the gm obd1 era is the most supported/widely used? Ya just got the book for s***s and grins I have read other books on tuning ya general in nature for sure.

[EagleMark]

1227747, 1227727, 1227730, 16197427 etc... so many... what are you looking to do? TBI? MPFI? Certain car?

[Fuse]

mpfi I think if my el camino was mpfi I would still have it lol. I probably could have tuned it to be a little more driveable and reliable. I don't have any ides set in stone yet but I think a mpfi v8 would be cool. Haven't really picked a body style yet.

[EagleMark]

1227727 $8D S_AUJP

http://www.gearhead-efi.com/Fuel-Inj...Information-8D

[1project2many]

what ecu in the gm obd1 era is the most supported/widely used?

Most supported??? As in which ecm has tuning software available from the most software writers? That's probably the 1227747. Or most supported as in the one that people on an EFI forum are most likely to know something about? Well, that really depends on the forum. Truck ecm's like the 7747 or the 6395 are more likely to be known on truck forums, while car ecm's like the 1227727, 1227730, 1227165, and 1228063 are more commonly discussed on car related forums. Or most supported as in most likely to be found in a junkyard or on Ebay? Well, that depends on the time of the year and what area of the country you're in. Probably the single most commonly supplied ecm's from the factory are the 1227727 and the 1227730 which have been used with TBI and PFI on 4, 6, and 8 cylinder engines. If you're going to build an 8 cylinder engine and you're not planning to use forced induction then a 7730 with 8D would be a common first step.

[Fuse]

Thanks ya just making sure Im studying an ecu that I may actually tune. So lets say I get to know the 7727 good and I get another gm with a different ecu will tuning it be about the same as tuning the 7727 or are the difference between the obd1 ecus drastic?

[FSJ Guy]

Same same, but different. :D

All the tuning concepts you learn with one ECM will carry over to another. It's more a matter of learning the concepts and how one parameter will affect everything else. That will carry over to Honda or Ford tuning, too. But they might call the parameters by a different name.