A brief overview of the TCM - LC* versions is kept in the Accessport user manual available on our website.
*LC refers to the Launch Control TCM Rom for each of the various generations of Nissan's Revisions.
*Note that with all launch control systems, certain requirements must be met including minimum and maximum transmission temperatures.
The first GT-Rs (2008 JDM and 2009 USDM) originally shipped with a launch control system popularly referred to as LC1. It was enabled by putting the car's transmission/suspension/VDC in manual+race/race/off modes. From there, holding the brake would allow you to rev the car to 4,500 RPM with the accelerator pedal at the wide open throttle position. The instant you lift off the brake, the computer will drop the clutches and the car will launch forward. This yields 0-60 times of 3.3 - 3.6 seconds depending on the surface. It's an extremely aggressive launch and is very hard on the transmission internals. It's use is not warrantied by Nissan.
Starting with the Model Year 2009 (MY09 World Market and 2010 USDM) GT-R, Nissan offered a new Launch Control, "LC2". LC2 is easier on its gears than LC1. At launch, up to 3000 RPM are used as opposed to the 4500 RPM seen in LC1. A customer satisfaction program was offered that allowed 2009 owners to upgrade to this new transmission software, as well as mandated that all unsold 2009 inventory be upgraded by dealers. In its engagement, the transmission computer will slip the clutches as opposed to suddenly engaging them. LC2 is mode independent and is otherwise engaged via the same two step method. Using this technique, the GT-R's launch is somewhat more tame than LC1 but still more aggressive than flooring the gas pedal from a stop. Turning VDC OFF does not seem to effect the initial launch. Note that LC2 is widely viewed as being inconsistent: the RPM given may vary. Also, LC2 equipped GT-Rs can be launched from higher RPM levels by using a pump method. This involves letting the RPM drop down after reaching near 3,000 RPM, then immediately slamming the accelerator back to the floor while the brake is still depressed. The results of this are not consistent but will yield more launch RPM. In performance terms, LC2 is seen as being at least a tenth or two slower than LC1 although some initial tests found it's performance to be similar. Use of LC2 is warrantied by Nissan so long as VDC is ON. The GR6 appears to handle LC2 well - there have been no known failures from launching using it, despite some cars having much more than 200 launches on them.
For the Model Year 2010 (MY10 World M and 2011 USDM) GT-R, Nissan quietly revised the launch control system and created a revised system we refer to as "LC3". LC3 can only be engaged with the GT-R in Manual+R/R/R but allows 3,300 RPM quickly, reliably, and consistently. The launch from LC3 is reportedly better than that with LC2.
With it's platform revision to for the Model Year 2011 (MY11 World Market and 2012 USDM) GT-R, Nissan publicly announced a new, dedicated, Launch Control. This system called "R Mode Start" (what we term as LC4), is engaged by having the GT-R in Manual+R transmission and VDC settings It enables a 4,000 RPM launch that is reliable and consistent. It is more aggressive than any of the prior Launch Controls except LC1 and is as reliable as LC2. It can be used up to four times in a row before the GT-R must be driven for over a mile for the computer to allow additional launches. On an unmodified GT-R, it is widely viewed as the fastest Launch Control system to date. With the addition of 50 more horsepower, DBA-R35 GT-Rs can achieve 0 - 60 MPH times in under 3.0 seconds. At a drag strip, 1.6 60' times are common. It is fully warrantied by Nissan.
For Model Year 2012 (MY12 World Market and 2013 USDM), Nissan released another update for the TCM module that is called LC5. LC5 is a series of updates to the LC4 system which allows the clutch to slip more improving drivability. Users have reported smoother reverse, upshift, and downshifts. In auto mode the car stays in 4th and 5th gears longer. MY12 GT-R retains the Current “R” Mode Start” (LC4) procedure.
LC5 (MY13 or USDM 2014) (sometimes called LC6)
For model year 13 (MY13 World Market and 2014 USDM), there was a single byte update to the transmission mapping. In our testing, there is no difference in drivability, but it is available to try at your convenience.