What's inside the Cummins ECU...
#61
Registered User
Thread Starter
Updates
I've updated my site and project log, and added a new page to track the RomRaider (ECU Editor). I've gone through the rest of the DTC-generating code, and I'm ready to begin testing downloading of changes into my truck's ECU.
Status updates at Dodge/Cummins ECU
Status updates at Dodge/Cummins ECU
#65
Registered User
Thread Starter
#66
Registered User
Thread Starter
Progress continues
Every day just keeps on getting better...
I now can read/write the memory, thanks to some clever hacking with the SCI routines and disabling a little 'check' routine that kept setting a P0606 whenever I would write to the tables in RAM. Time to finish figuring out what the tables do and see what happens when I change 'em.
I now can read/write the memory, thanks to some clever hacking with the SCI routines and disabling a little 'check' routine that kept setting a P0606 whenever I would write to the tables in RAM. Time to finish figuring out what the tables do and see what happens when I change 'em.
#67
ecu
this is some great progress. hopefully this is progressing to the software/wardware link that will let the vp44 trucks take a step forward in the diesel world. its very interesting to see what new things are posted on your site. some of them are above my (limited comp. code/writing) knolwedge but have learned from a few points. please keep up the awesome work and let the members know if we can help you out in any way.
maybe this can turn into the efi live we all been wanting for the fueling timing and rpm control.
maybe this can turn into the efi live we all been wanting for the fueling timing and rpm control.
#68
Registered User
Thread Starter
Work continues. I found the map that generates the requested torque from the APPS input and the engine speed. I confirmed this by making some changes to it - I lowered all of the values above 50% throttle (cut it off) and took a drive. The power that used to suddenly appear just before 2000RPM was gone. Just as I had suspected it to be. For fun, I dropped them lower and tried again but it wanted to stall whenever I let out the clutch and tried to go.
At least with the SCI mod, I can just turn the key off for a bit, then back on, and I'm back to stock again.
At least with the SCI mod, I can just turn the key off for a bit, then back on, and I'm back to stock again.
#69
Banned
Work continues. I found the map that generates the requested torque from the APPS input and the engine speed. I confirmed this by making some changes to it - I lowered all of the values above 50% throttle (cut it off) and took a drive. The power that used to suddenly appear just before 2000RPM was gone. Just as I had suspected it to be. For fun, I dropped them lower and tried again but it wanted to stall whenever I let out the clutch and tried to go.
At least with the SCI mod, I can just turn the key off for a bit, then back on, and I'm back to stock again.
At least with the SCI mod, I can just turn the key off for a bit, then back on, and I'm back to stock again.
#70
Registered User
Thread Starter
Maps, tables
I've added a couple of screen captures of maps and a short description of what they do, on my ISB RomRaider page: http://vs18k.dyndns.org/cecu/romraider.html
These two are related to the engine's torque limit and how the requested torque is generated from the accellerator position.
These two are related to the engine's torque limit and how the requested torque is generated from the accellerator position.
#71
Banned
I've added a couple of screen captures of maps and a short description of what they do, on my ISB RomRaider page: http://vs18k.dyndns.org/cecu/romraider.html
These two are related to the engine's torque limit and how the requested torque is generated from the accellerator position.
These two are related to the engine's torque limit and how the requested torque is generated from the accellerator position.
#73
Registered User
Thread Starter
I'm putting together a 'flow chart' of how the final timing number is actually generated. Hopefully that will shed some light on how all of these things interact, and what the numbers really mean.
#74
Registered User
Join Date: Aug 2004
Location: SoCal
Posts: 1,219
Likes: 0
Received 0 Likes
on
0 Posts
this is some great progress. hopefully this is progressing to the software/wardware link that will let the vp44 trucks take a step forward in the diesel world. its very interesting to see what new things are posted on your site. some of them are above my (limited comp. code/writing) knolwedge but have learned from a few points. please keep up the awesome work and let the members know if we can help you out in any way.
maybe this can turn into the efi live we all been wanting for the fueling timing and rpm control.
maybe this can turn into the efi live we all been wanting for the fueling timing and rpm control.
Bob
#75
Registered User
Thread Starter
That is probably correct. But this isn't all about power, it's about fun. Perhaps a different kind of fun, it is fun to me. I wanted better throttle response, better low end, and better fuel economy. I am certain I can reach those goals through software.