Thanks again for explaining. When we downshift, what rpm range should we be in? I always hear of drivers redlining before every shift up. Doesn't it work the same way down?
It all depends on the gear ratio and the speed u are travelling.
Different car hav different gear ratio so the matching rev for a smoother downshift is also different.
"Heel-n-toe" like bro rallychamp mention is a great technique to do braking and engine braking at the same time.
If done properly,it will be so smooth instead of a surge of rev causing weight being transferred to the front and disturbing comfort and balance during cornering.
Corner will also feels like straight and soon u wont believe the speed u took a corner.
If u are used to your car,u will instinctively know the suitable rev to match with the suitable gear.
On automatic gearbox which do downshift to aid braking,it all depends to the gearbox to quickly accelerate again.
For example,with the Wira 1.5,its soo slow to accelerate again bcoz it just using an old age autobox.
With the Waja 1.8,when doing hard braking,the gearbox will downshift to the correct gear to make sure u are always in the right gear to accelerate again.
It all depends on the tech that are in the gearbox.
On revving up to the redline,this also depends to the engine characteristic.
With the Waja 1.8,revving to redline is almost useless as the engine is tuned for loads of low-end torque.
Revving it to redline only results in more noise but not much go.
In racing,its normal to keep the rev as close to the redline as possible bcoz race engine are tuned for loads of power on the higher rev so race driver will keep the rev high even when shifting to lower gear.
This is unnecessary for for everyday driving unless u want to blow your engine.
For example,i will heel-n-toe to keep the rev between 3k rpm ant 4k rpm when i want to hav a fun drive with the Neo CPS.
I can keep it above the 4400rpm-CPS kicks-in-point but as i'm driving not that fast and on public road and i hav to be safe to others as well.