90Vette
01-05-2021, 11:40 PM
I have a 1990 Corvette, which has the 1227727 running $8D. I'm looking at tuning it for boost, but I can't find an option that preserves the ECM-CCM communications required in '90-'91 vettes for some dash displays (and possibly ABS/climate control).
I'd really like to have more functionality than stock, such as being able to run flex fuel or use a wastegate to control boost based on gear/alcohol content/etc.
I see a few options:
Upgrade the hardware (standalone/EBL Flash) and either replicate CCM comms or somehow leave the 727 connected for this functionality. No one seems to know what the datastream to the CCM looks like, and I have no idea how I'd run the stock ECM in parallel with a standalone.
Add a RAM chip to my ECM and hack $8D to make it do what I want. Toooooons of work.
Flash $58 or $59. Edit: this (https://www.corvetteforum.com/forums/c4-tech-performance/649900-convert-l98-727-ecm-to-boost-aware-sy-ty-749ecm.html#post1545256997) CF post says that $58 and $59 won't work.
Use it as-is with a 2-bar MAP sensor. Not considering this.
Can anyone comment on this?
I'd really like to have more functionality than stock, such as being able to run flex fuel or use a wastegate to control boost based on gear/alcohol content/etc.
I see a few options:
Upgrade the hardware (standalone/EBL Flash) and either replicate CCM comms or somehow leave the 727 connected for this functionality. No one seems to know what the datastream to the CCM looks like, and I have no idea how I'd run the stock ECM in parallel with a standalone.
Add a RAM chip to my ECM and hack $8D to make it do what I want. Toooooons of work.
Flash $58 or $59. Edit: this (https://www.corvetteforum.com/forums/c4-tech-performance/649900-convert-l98-727-ecm-to-boost-aware-sy-ty-749ecm.html#post1545256997) CF post says that $58 and $59 won't work.
Use it as-is with a 2-bar MAP sensor. Not considering this.
Can anyone comment on this?