I've setup my launch control as follows.

Hard limit 3500rpm
soft limit 200 rpm
Soft limit degree 5
Enable launch tps 20%
fuel cut only

My problem is, it revs up i can hear turbo start to spool up and bounces at set rpm like it should but then when I let off the throttle, instead of returning to idle the car just dies like the fuel isn't coming back quick enough. Whole time I've kept the clutch fully in. Have to turn car completely off and then restart. I haven't actually tried launching yet it yet until I figure out why it won't stay running. any help would be appreciated. Thanks!

 

How "tuned" is the car otherwise? If the car can barely idle on its own then it's going to struggle coming down to idle from such a dramatic/dynamic process.

Does it try to catch idle and just chug off, or does it go straight from Launch to 0 rpm?

 

Its been fully dyno tuned. Been running the car for a couple years idles great. I just dies right out, doesn't even seem like it tries to idle. After I let off gas it just totally revs down to zero.

 

On the Rev Limiter screen, what do you have Soft Limit Zone / Hysteresis set to?

On the Launch Control screen, what do you have Soft Limit Zone and Spark Cut Zone set to?

 

I'm not sure about the rev limit screen. On the Launch control menu I have set to just fuel cut @ 3500 rpm, soft cut is set to 200 below that. I didn't like using the spark cut because it would cause erratic movement of the tach.

 

Can you post the tune, and if its not too much to ask can you post a log of this particular event?