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I'm running a factory ecu with a daughter board that has some additional capabilities added to it like launch rev limits and ignition retard on an SR20DET. The ecu can also store two different tunes and toggle between them with the flip of a switch while the engine is running. I'm looking at how to best leverage the available features for launch and traction control, and potentially flat shift. My plan is to hook up the clutch switch to the ecu so that the ecu uses one tune when the clutch is depressed and the other tune the rest of the time. Each tune has the following parameters/limiters available:
Launch Rev Limit, ignition Retard - RPM at which ignition is retarded to a set value
Launch Rev Limit 2, fuel cut - RPM for fuel cut limiter
Ignition Retard value - definable ignition angle value for limiter
Launch speed cut off - definable speed for deactivating launch limiters(limiters inactive above this threshold)
Normal Rev Limit, Ignition Retard - main limiter using ignition retard
Normal Rev Limit, fuel cut - main limiter using fuel cut
So basically I have the potential of two sets of discreet launch and main rev limiters as well as the ability to switch between rev limiters based on a clutch switch or driven wheel speed, and I can specify the amount the timing is retarded when the limiter is active. What would be a good strategy for setting these limiters to be more effective than just a conventional 2 step limiter?
Here is a little of what I'm thinking. The tune that is active when the clutch pedal is depressed would be used for the stationary rev limit and to build boost before launch. The Normal rev limits on the same tune could be used as a flat shift limiter. The second tune could use the launch limiter to retard the timing and reduce torque to prevent excessive first gear wheel spin. The Normal rev limiter of the second tune would then be used to limit max overall RPM.
Any ideas on a starting point for these parameters?