Guess those tunes are playing to the strength of the IS20 and making huge torque up front with a steep taper?
Look at any is20 dyno sheet too, it's checking out usually after 4800-5200 RPM, after that all you're doing is making heat.
There's more to when you should shift where peak power is made though.
Typically speaking, you want the most acceleration possible. Just because you're at a part of the powerband where you make the most power doesn't mean you'll accelerate the quickest.
Think of it like this, is20's can make peak tq at super low RPM and DSG's <3 themselves some 6th gear.
Let's for the sake of argument our is20 DSG GTI makes peak tq at 2000 RPM and we're:
In manual mode
Cruising in 6th gear (like a choad) at 50 MPH
When all the sudden vape nation soobie wants to establish dominance by (t)rolling on you. Pulls up along side of you and flashes you a 'dudeBRO' head nod and tells you to count the honks off.
Now we know we make all the torques eva and downshifting is for fags so we're thinking we don't have to downshift for max accel on the third honk, we lazily leave the bitch in 6th and mat it.
honk, honk, honk and vape nation runs wild on us.
"But bruh...muh torques..."
Now we do the same thing only start in 3rd at roughly 3500 RPM(past where peak tq is made btw) and give vape nation a proper gaptizing.
Now let's say if it's a 50 mph-160 mph race because we're irresponsible fuckbois who ain't give no bother.
Assuming we're in the same exact car as before would we get to 160 mph faster by shifting at 5200 rpm each time meaning we'd do the last amount of our acceleration in 6th gear(0.46 ratio) but be in the fatter part of the power band OR shifting each gear at 6500 and getting to 160 just before 6000 rpm in 5th(0.58 ratio)?
The latter would yield greater acceleration, BUT do it more inefficiently causing greater levels of heat and would yield diminishing returns in say a road race on a point and shoot track(Circuit of the Americas, Road Atlanta)where you're continually building up speed and spending a ton of time in high load situations.
Overall it's a lot like braking. Being hard on an engine and operating it out of peak efficiency for the sake of acceleration isn't horrible. Spending a lot of time in that inefficiency zone is where things start to come apart.
And holy fuckballs are the DSG gears way too fkn long for 4-5-6