Got annoyed with the trunk only opening up a few inches, so I took some inspiration from a few of the other threads here and did a quick and cheap mod to get the trunk to fully open!
Video of the result:
The basic idea was to give the torsion bars that open the trunk a bit of an extra push.
- Extension springs. 3.5" long (too long and it will sag and fall off in its relaxed position, too short and it might place too much stress on the spring). On the back of the package it says safe working load of 2.1lb, don't know if that is relevant. Cost: ~$4.
- Clips to hook the spring onto the torsion bar and the car. Cost: ~$0.50. I ended up using two kinds: 1/4" rubber lined clips to hook onto the torsion bar, and mirror clips I already had to hook onto the frame of the car. More on that later.
Those black rods are the torsion bars that provide the "twist" that opens the trunk. Unfortunately on my car, they only seem to lift the trunk up a few inches...
Rubber Lined Clamps. I didn't want metal to metal contact, hence the rubber. The width of the clamp prevents it from moving around the bend in the tension bar. Also, don't try using S hooks or something that fits loosely because what you will find is that when the spring is stretched, the hook will snap around the corner of the tension bar and return to it's slack position. Chances are good something will fly off and hit you in the face, especially when one is lying in the fetal position inside the trunk working off the flashlight on the phone.
I didn't take a picture of the mirror clips, but they are just your basic metal mirror clips. I wrapped vinyl electrical tape on it to avoid metal to metal contact, and then stuffed some sponge material where it contacts and presses against the car frame.
This is how I hooked it up, with the trunk in the open position and the spring in it's relaxed position. Mirror clip with sponge on the upper left, rubber lined clamp around the torsion bar on the lower right.
View from the side with the trunk closed. Spring is in stretched position.
View looking up with the trunk closed.
With one spring thus installed, the trunk would fully open, but I'm an impatient person so I put both springs in (one on each side) so now the trunk opens up at a snappy pace, and it does not require noticeably any more force to close it.