N00b question about resizing injectors
Posted: Thu Oct 28, 2021 7:41 pm
Hi,
At risk of sounding completely ignorant on the subject, from what i understand with the feature pack the TIM should be the main (if not only) value that should change for a resize injector operation.
I've got a 1986 300zx Z31 Turbo (VG30ET) and I'm going from the stock 260cc injectors to 650cc injectors. After downloading the maps from the ECU i do a resize injector operation. Leaving the options default i enter 260 as the current size and enter 650 as the new size, it changes the TIM to 411. I adjust the injector latency to 868us as per the specifications, burn the maps to the ECU, and when i turn the engine over it sputters for at most 3 seconds. In that time a tremendous amount of unburnt fuel is passed through the exhaust to the point that there is a puddle forming underneath the car.
This is the kind of behavior that i would expect if no changes were actually being applied to the ECU, however i have every indication that my changes are indeed being stored correctly. I can connect to the ECU, download the maps and confirm that the changes have been applied. After each change Nistune confirms each memory address that is updated successfully.
Changing the injector latency higher or lower seems has no effect, and setting the TIM to lower values seems to have no effect.
My question is; have i missed something obvious, and what other area should i be looking into to adjust for this resize operation.
At risk of sounding completely ignorant on the subject, from what i understand with the feature pack the TIM should be the main (if not only) value that should change for a resize injector operation.
I've got a 1986 300zx Z31 Turbo (VG30ET) and I'm going from the stock 260cc injectors to 650cc injectors. After downloading the maps from the ECU i do a resize injector operation. Leaving the options default i enter 260 as the current size and enter 650 as the new size, it changes the TIM to 411. I adjust the injector latency to 868us as per the specifications, burn the maps to the ECU, and when i turn the engine over it sputters for at most 3 seconds. In that time a tremendous amount of unburnt fuel is passed through the exhaust to the point that there is a puddle forming underneath the car.
This is the kind of behavior that i would expect if no changes were actually being applied to the ECU, however i have every indication that my changes are indeed being stored correctly. I can connect to the ECU, download the maps and confirm that the changes have been applied. After each change Nistune confirms each memory address that is updated successfully.
Changing the injector latency higher or lower seems has no effect, and setting the TIM to lower values seems to have no effect.
My question is; have i missed something obvious, and what other area should i be looking into to adjust for this resize operation.