Important: You need to have the latest EcuFlash version and ECU definitions installed in order to be able to edit the feature parameters. Also make sure you have set the user level to developer.
Images shown below are just for reference, actual data may differ
If you will be using a stock ROM you can skip this part and go to the Patching steps below. If you already have a patched ROM file and you wish to use that, you must first unpatch the ROM.
1. Extract downloaded LC patch .zip file into a seperate folder, now you should have these files:
The purpose of this feature is to allow you to hold your foot planted to the throttle while stationary and forcing an RPM delta (offset to real rev limit) that allows the car to hold a user desired rev limit and launch with as much less wheelspin as possible when releasing the clutch.
Of course this RPM limit must be disabled after the car has reached a specified speed threshold.
The actual logic/algorithm is like this:
read vehicle speed
if vehicle speed > speed threshold then
no adjustment to real RPM
else
adjust real RPM by RPM delta
pass control to rev limiter check (fuel cut)
Effectively rev limit = rev limit - RPM delta, the higher the RPM delta value the lower the actual rev limit becomes, the lower the RPM delta value the higher the rev limit becomes.
Lets see some examples and interesting extra features
IMPORTANT NOTICE: LC RPM Delta is an offset to the normal rev limiterLaunch control enabled, from stationary to 10km/h
rev limit is 7200rpm
LC speed threshold=10km/h
LC RPM delta=1700rpm
rev limit will be 5500rpm (7200-1700) till vehicle reaches 10km/h
Valet mode
rev limit is 7200rpm
LC speed threshold=255km/h
LC RPM delta=3200rpm
rev limit will be pegged to 4000rpm (7200-3200)
Normal operation (feature disabled)
rev limit is 7200rpm
LC speed threshold=0km/h
LC RPM delta=0rpm
no change to rev limit (7200-0)
Stationary rev limit
rev limit is 7200rpm
LC speed threshold=0km/h
LC RPM delta=3200rpm
rev limit will be 4000rpm only when stationary (7200-3200)
Another parameter you might want to raise is the "Rev limit fuel resume", this is located in the Misc category. This parameter controls when will the fueling will resume after hitting the limiter (limiter being LC, FFS or normal). More specific, the ECU will not allow fueling until the manifold ABSOLUTE pressure drops below the value set in this parameter. By default this is set to 1.68 bar/24.36 psi absolute pressure. In practice, if when using LC/FFS the absolute pressure you build is higher than this value, you will experience "car falls on its face"