Many are faced with such riddles, and most car owners do not even realize the essence of what is happening. In some situations (especially during overtaking), a car with low acceleration dynamics is simply dangerous! So, this trouble is not new: even on the “Lada” of the last century it happened that the driver pressed the gas pedal to the floor, and the throttles only opened partially. Tradition? In any case, a common thing on modern injection machines.
So, you found that the throttle does not open far completely. How to fix it? I want to warn you right away: we will consider the advice to tighten the cable purely speculative, mainly they come from garage “theorists” who are unfamiliar with the intricacies of the drive device. First of all, it is worth remembering that the cable 3 of the drive should have some slack. Otherwise, when the gas pedal is released, throttle 5 is ajar, because of this, the idle speed is unacceptably increased, and on the go when the gear is engaged, the car behaves inappropriately - it goes when you try to brake the engine, it slows down, etc. due to the cable pulling, the throttle additionally opens exactly as far as the idle speed is violated - in short, this measure is unacceptable.
As you can see, it is not a matter of adjusting the length or sheath of the cable (which is the same for the result), but in the magnitude of its stroke. Take another look at the drawing. The stroke is limited by the fact that the pedal rests on the floor. How to increase it? The answer is obvious: bend up pedal 1 or the entire bracket 2 together with it. I do not want to recommend the second - inadvertently tear off the bracket. But to really bend the pedal. It remains to decide how to do this.