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If you're going to put your foot in half way then put it in from the start and leave it until you reach the desired speed. The easiest other way is to wait until after the second gear shift is complete and then apply a little more than half throttle.
The only part that requires adjusting is the nut behind the wheel.
As you've discovered there's a lag betwixt initiating and completing a shift sequence. The twin scroll turbo spools up quickly. Much faster than the shift. Worry about first to second as the rest are taken care of in part by the speed at which the car is going down the road.
If WOT produces too harsh a shift then ease up a tad.
Um, ok, thank you for that I guess... this is a new development, not something that has been going on sense I first got the car. the computer is more sophisticated than what you are suggesting. My 67 mustang built to the wall, has a shift kit and is designed to shift hard, and does so, but at every shift regardless of the throttle position due to the fact that it is not computer controlled. I expect a hard neck snap from that not from the Hyundai. I was asking primarily to find out if it was something particular to the car, a defect that others were experiencing or something unique to my car.
Uh, you're welcome and lucky for me you've the sense to know the difference since you're so steeped in automotive expertise.
By all means take it to the shop if you're so of mind and report back as to what they discover.
The computer will prevent early downshift even w/paddles or manual, more so than early upshift, but there's a definite lag that's rather lengthy on the auto upshift.
You're inducing the hard shift by timing the over half throttle betwixt the shift. On purpose or unintentionally you're shooting the throttle after the shift sequence has started, yet before it's complete.
I can do it 9 outa 10 times easy on first to second. It's merely a matter of timing the auto shift or manipulating the ECM to shift early and then spooling up the turbo before it's finished.
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