hjtrbo
Donating Member
- Joined
- Feb 21, 2007
- Messages
- 554
- Reaction score
- 585
- Points
- 93
- Members Ride
- FG XR6T / HJ Ute / VF2 R8
2 victims. Can't be that hard can it?
Surely just throwing bits at it isn't the right way to diagnose??? Can you buy a basic scan tool and log a few things. Start with fuel pressure. Goodness, for the cost of the fuel pump install that you might not even need you could be up and running with your own software and tuning it yourself.
@kleanphil O2 sensors are not used during start up regardless of engine coolant temp. You're open loop for at least 10 seconds depending on O2 enable conditions.
Generally after a cam swap and once the tuner has got MAF / VE tables sorted, they will then add a few g/s to the startup airflow table, add a few g/s to the minimum idle airflow in the lower rpm columns, maybe add 30 or so Nm to the throttle follower lower rpm columns depending on idle MAP. For a a mid cam, they'll take a bit of adaptive spark out and for the bigger cams may need to hit the cranking fuel / air table for restarts and also spend a bit of time with step up / step down throttle follower settings.
That is really all there is to it on these GM Gen 4 ECU's. Once you exceed the limits of the ECM's axis with 900+hp things get a bit harder, axis rescaling, double stoic half injector flow rate methods, torque management deletes etc. But for the dime a dozen street tune, they're very simple. Much easier than the Barra PCM.
In America a lot of guys work and tune their own cars. For some reason in Australia, everyone thinks that a workshop has to do everything except the most simplest of tasks, and that only performance workshops can tune. Take control guys.
Surely just throwing bits at it isn't the right way to diagnose??? Can you buy a basic scan tool and log a few things. Start with fuel pressure. Goodness, for the cost of the fuel pump install that you might not even need you could be up and running with your own software and tuning it yourself.
@kleanphil O2 sensors are not used during start up regardless of engine coolant temp. You're open loop for at least 10 seconds depending on O2 enable conditions.
Generally after a cam swap and once the tuner has got MAF / VE tables sorted, they will then add a few g/s to the startup airflow table, add a few g/s to the minimum idle airflow in the lower rpm columns, maybe add 30 or so Nm to the throttle follower lower rpm columns depending on idle MAP. For a a mid cam, they'll take a bit of adaptive spark out and for the bigger cams may need to hit the cranking fuel / air table for restarts and also spend a bit of time with step up / step down throttle follower settings.
That is really all there is to it on these GM Gen 4 ECU's. Once you exceed the limits of the ECM's axis with 900+hp things get a bit harder, axis rescaling, double stoic half injector flow rate methods, torque management deletes etc. But for the dime a dozen street tune, they're very simple. Much easier than the Barra PCM.
In America a lot of guys work and tune their own cars. For some reason in Australia, everyone thinks that a workshop has to do everything except the most simplest of tasks, and that only performance workshops can tune. Take control guys.
