Modify table parameters in $8D

[space387]

I am looking to repurpose the egr function to activate a set of exhaust cutouts on my 1990 corvette. It is running the $8D bin on a 1227277 ecu. Looking over the parameters of the egr activation I see the duty cycle table tops at 2000. Is it possible in the decompiled code to change the table range? Ideally I would like it to shift the range up to 3000. If there is a better suited channel on this ecu that would also be an option.

Thanks in advance.

[84Elky]

I am looking to repurpose the egr function to activate a set of exhaust cutouts on my 1990 corvette. It is running the $8D bin on a 1227277 ecu. Looking over the parameters of the egr activation I see the duty cycle table tops at 2000. Is it possible in the decompiled code to change the table range? Ideally I would like it to shift the range up to 3000. If there is a better suited channel on this ecu that would also be an option.

Thanks in advance.

Having difficulty relating EGR activation to exhaust cutouts. Please elaborate more on what you are trying to accomplish.

[space387]

Having difficulty relating EGR activation to exhaust cutouts. Please elaborate more on what you are trying to accomplish.

I am using the egr output to control cutouts. Is there a better option?

[steveo]

without modifying the code, the egr output could be an annoying/unreliable way to control the cutouts. as an emissions control, it may have test cycles (open briefly when you don't want it to). it may have parameters that are undocumented that prevent its operation as well.

what are your desired parameters for your cutouts to open? minimum tps? rpm? map?

[space387]

The goal is to open above 2500 and at a tps of over 50%

[84Elky]

I am using the egr output to control cutouts. Is there a better option?

Sorry, misread you post. If it's working, great. If not, no way to change upper RPM of the table at 0x8b5 without code modification. What about CCP. It's controlled by MPH, MAP, TPS% and air flow. Don't know how to make it work, but it may be a candidate.

[space387]

I was actually asking about code modification to fit my needs. There are a few tables I could benefit from changing but this was the most direct. Basically what I was hoping was to figure out how the tables are defined and without changing the number of addresses change the rpm scale of it.

[space387]

Using the already decompiled and expanded ANHT and JP_AUJP2 I found the table definitions at x2B2 for the minimum RPM, x2B3 for the minimum load value and x2B4 the number of lines per RPM block. x2B2 is 20 in hex and 32 in decimal, leading me to believe it is this value in decimal x25.x2B3 is load so I am not sure if this is a KPA reading or a calculated load based on kpa temp tps and a few other factors. Any clarification on this would be great because the scaler is noted as load and the table is noted as MAP. my current changes are to make x2B2 40 to raise the rpm base to 1600 and x2B3 to 14 for a base of 20(load/KPA)