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Summary of change:
As usual, if your Launch Control dialog in VemsTune looks less sophisticated than [https://vems.hu/vt/help/v3/v3_launch_control.html VT Help web version] '''BE ALARMED THAT actually using an old firmware and upgrade (min fw >= 1.2.38) could be beneficial to enjoy really good more configurable, more versatile extended functions'''. ---- Used on start line, to achieve best performance with the less effort. Driver must press gas pedal to 100%, and press a button on the wheel. Launch control routine need to limit the rpm into a desired range, while the button pressed, and allow ALS to work (ALS normally disabled on so high TPS). See the figure how it is achieved: http://www.vems.hu/files/MembersPage/GaborRacz/softlaunch_config.PNG * '''Minimum RPM''': The operational range starting rpm. Suggested value: The highest torque rpm, or whatever. * '''Control range''': The operational range. This one can be set via the control range of the redline control. Suggested value: 200-500. ---- '''most important RPM related variables''' - please check these carefully for your setup. * '''config_ext.launch_retard_rpmrange DO NOT SKIP THIS PLEASE!''' ** upgrade to min 1.2.38 (launch_retard_rpmrange not available in 1.2.31) * config_ext.launch_retard_margin ** also 4 RPM resolution * config_ext.launch_rpm * overrides config.softrpm_rpm * '''config.softrpm_range''' - yes, check this value carefully ! ** =4b would be 75*4=300 RPM range... FF=1020 RPM might be way too wide * launch_rpm_trim ** yes, like almost anything, can be trimmed with anytrim ! ** configured in anytrim, not directly '''PLEASE OPEN VEMSLOG, save CONFIG''' (no need to connect to ECU, enough to open vemslog) and '''check above variables carefully'' (take notes on your MembersPage). '''High values, especially FF should be extremely suspicious...''' ---- '''See also''' * MembersPage/GaborRacz/NewAlsLaunchAndOthers '''launch_retard_rpmrange IS NOT SPECIFIED, PLEASE !''' * If it does not exist in 1.2.31 that means using many years old firmware might be cause of the missing config setting, and actually added configuration support years ago, been plenty of time to upgrade. ** '''launch_retard_rpmrange available at least since 1.2.38''', so upgrade to min 1.2.38 (any newer like 1.2.43 or 1.2.44 also has it of course). launch_kparange=FF launch_retard=78 als_max_cut=2B launch_rpm=30 launch_retard_margin=4B softrpm_range=4B ignchmax=05 als_igncut_rpm1=11 softcut_rpm1=FF softcut_rpm2=FF softcut_time1=00 softcut_time2=00 softcut_cut=FF launch_speed1=97 Why is revlimit not configured in the setup ? (9k RPM for example ?) [http://www.vems.hu/files/MembersPage/PoweredM/LaunchRetard/ uploaded vemslogs] ... * is launch_rpm 4800 RPM ? ** What is retard (or actual spark advance) from 3900 .. 4400 RPM ? ** Ancient fw 1.2.31 does not have launch_retard_rpmrange so retards a bit early, solved years ago, use new firmware that supports it. Upgrade to min 1.2.38 ---- Boost target vs time (often used vs wheelspeed but rarely according to time since launch) is getting more time range (expected 1.2.45). ----
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