Rednaxs60
Member
Have mentioned specific tuning and new CFI configuration regarding the IAC system upgrade, and using LTFT for VE table calibration.
A small tuning aspect is to compensate for the different fuel injector latencies. I have checked Tuner Studio and could not find a fuel injector offset calibration; however, the MaxxECU has this function. The premise is that injector latency can have a cylinder operate in a lean or fuel rich condition. This is true and I have experienced it. This is the main reason that fuel injector data is very important.
I have OEM Bosch 360 cc/min fuel injectors that have the OEM latency information for each individual fuel injector provided. The ECU settings can be for a "gain" setting used for higher power up to full power, or for an "offset" setting for low powers and engine idle. I am more interested in the "offset" calibration.
The base injector latency is an average of the four injectors or can be a chosen value that would be appropriate. The four injector latencies are: injector 1 - 0.41ms; injector 2 - 0.355ms; injector 3 - 0.368ms; injector 4 - 0.41ms. You can choose either the upper value of 0.41ms, or the lower average value of 0.36ms for the base value.
Using a base injector latency setting of 0.41ms, in the injector calibration section under Offsets, set the injector offsets to: injector 1 - 0.0; injector 2 - (-0.6); injector 3 - (-0.42); injector 4 - 0.0. When the ECU calculates the injector pulse width using a base latency of 0.41ms, the injectors that have a lesser injector latency are being held open for longer than necessary and the affected cylinder(s) will operate in a fuel rich environment. If the injector latency is greater than the base injector latency, the affected cylinder(s) will operate in a lean fuel environment.
You can use the lower injector setting of 0.36ms. This would make injectors 2/3 have a "zero" calibration and injectors 1/4 have a calibration of 0.05ms.
Having mentioned this, injector offsets will be used but after the VE tables are better calibrated.
Just another aspect of engine tuning with an aftermarket ECU.
A small tuning aspect is to compensate for the different fuel injector latencies. I have checked Tuner Studio and could not find a fuel injector offset calibration; however, the MaxxECU has this function. The premise is that injector latency can have a cylinder operate in a lean or fuel rich condition. This is true and I have experienced it. This is the main reason that fuel injector data is very important.
I have OEM Bosch 360 cc/min fuel injectors that have the OEM latency information for each individual fuel injector provided. The ECU settings can be for a "gain" setting used for higher power up to full power, or for an "offset" setting for low powers and engine idle. I am more interested in the "offset" calibration.
The base injector latency is an average of the four injectors or can be a chosen value that would be appropriate. The four injector latencies are: injector 1 - 0.41ms; injector 2 - 0.355ms; injector 3 - 0.368ms; injector 4 - 0.41ms. You can choose either the upper value of 0.41ms, or the lower average value of 0.36ms for the base value.
Using a base injector latency setting of 0.41ms, in the injector calibration section under Offsets, set the injector offsets to: injector 1 - 0.0; injector 2 - (-0.6); injector 3 - (-0.42); injector 4 - 0.0. When the ECU calculates the injector pulse width using a base latency of 0.41ms, the injectors that have a lesser injector latency are being held open for longer than necessary and the affected cylinder(s) will operate in a fuel rich environment. If the injector latency is greater than the base injector latency, the affected cylinder(s) will operate in a lean fuel environment.
You can use the lower injector setting of 0.36ms. This would make injectors 2/3 have a "zero" calibration and injectors 1/4 have a calibration of 0.05ms.
Having mentioned this, injector offsets will be used but after the VE tables are better calibrated.
Just another aspect of engine tuning with an aftermarket ECU.
