Also don't downshift when redlining. With that said, don't redline
A few members on here have blown their engines doing so.
Were they redlining and THEN downshifted?
what is the advantage using sst?
regards!
Advantage? More control over the engine's output. Situations I like to use it:
Engine braking
"preloading" a gear to give me acceleration without waiting for the downshift, such as jumping lanes in traffic
Holding a gear in a turn for a constant speed for a faster exit
Messing around in the wookie-sound zone (Gen 1 V8 with aftermarket intake tube, ~3000-4000 RPM)
Pretending to racecar
As far as downshifts and redlining goes, if coming to a stop with engine braking, I use a loose 20mph X Gear number rule. I'll downshift only when the speed is 20x the lower gear's number. 5th>4th at under 80mph, 4th-3rd under 60. 3rd>2nd is a little different; I try to keep that under 35 because 2nd is geared weirdly high. I don't normally use 1st because I have a Gen 1 that partially locks out 1st. This all keeps the engine speed under 3000RPM generally. When it comes to mashing the throttle and then downshifting, I believe the computer will keep things safe.
There's really no major advantage though. It's a bit of a novelty. It's much better than say, SST in an Escape, where pressing the button only suggests a gear shift. The LS does a decent job of converting your command to an action, but it is still an automatic transmission. It's no sequential gearbox.