Two Step Rev Limit

New! The ECU+ includes a highly configurable two-step rev limit for launch control and no-lift shift applications.

Configuring the two step rev limits

For launch control (sometimes called stutterbox or stutter-step), you configure a lower rev limit to be used when the car is sitting still. This is used at the starting line for drag races, when it's desirable to build turbo boost and to have a specific launch RPM for maximum off-the-line launching. No-lift shifting is similar, in that a second lower RPM is used when shifting to keep the turbo spooled without feathering the clutch.

The ECU+ gives you complete flexibility in configuring these two modes. For each, you configure the desired rev limit, and what mode to use to limit revs. The modes are:

Anti-lag mode is a dangerous mode that's sometimes used with extreme drag race setups. This mode causes the spark to fire after TDC, which spools the turbo very quickly. It is, however, very abusive to the turbo, so it's only recommended for full-on drag setups.

For launch control, the ECU+ also allows you to set a vehicle speed threshold. This tells the ECU+ to disable launch control as soon as the car is moving faster than some MPH.

For no-lift shifting, the ECU+ uses a connection to the clutch "top switch," which indicates that the clutch is pressed in. The ECU+'s configuration panel shows a real-time display of clutch status, so it's easy to know when the clutch switch is wired correctly. (The PnP EVO ECU+ wires this by default, while the DSMs require an external connection.)