Install the coilover shock absorber for help

I just bought a used set of shocks to replace my existing shocks as two of them were already leaking oil. After checking that the damping and rebound are ok, I have a problem with the installation, please help me.
When installing the front springs, I found that both springs were off center, I don't think it's a quality issue, maybe that's how the factory designed it, I don't know how the springs should be installed to get it right, maybe leaning towards the engine or leaning out, I am not sure.
still have a question. There is a gap at the top of the tower in the picture. Where should the notch face?
thanks

 

Another question I was hoping someone could help me with relates to spring preload, I can adjust the gibs to change the spring preload and thus the position of the telescopic rod at rest, the question is what is the best position its supposed to be in, is it at 50% of full travel, or just 30% compression, or something else? I mainly drive it the normal way and it won't be very harsh.

 

Thanks a lot for everyone's replies and help. In the current situation of many fakes, I would rather buy a second-hand original, because its quality and performance are trustworthy. This shock is a coiled shock, and it can adjust the preload of the spring, so I can loosen the preload first Press and unscrew the nut at the top of the tower, no danger at all. I saw the tein shock and it seems to be the same as mine, it looks a bit shorter than the stock one, do you have a picture from the bottom up? i want to know where its barrel is located

 

Also sorry to show you the messy interior, maybe I'll clean it up as soon as possible

 

The springs on the stock shock are all mounted at a slant to counteract the tendency of the wheel and shock to twist the tie rods due to the different axes, so I'm thinking the springs are off center for that, just don't know where it should be oriented, If it is reversed, it may increase the wear on the side of the tie rod, so that the oil seal will be worn quickly and the oil leakage will fail.

 

You are direct and humorous so I can get your point, hopefully I can solve existing problems with a laugh. Thank you so much!

 

Thank you very much for your reply
People are not all so rich, they also have ideals and want to enjoy high-end performance with less money. It's common sense that new ones are better than old ones, at least visually. I'm personally willing to take a gamble with a small amount of money and a lot of love and effort, maybe it will work out, who knows?

 

Doesn't seem that serious dude.
The shock absorber has been checked before installation, the damping barrel, spring and adjusting crankset are all working, the damping of the damping barrel is adjustable, and the damping force is not small.
It has been installed on the car last Sunday, and some pre-setting operations have been checked and performed before. After the installation is completed, some adjustments have been made, referring to the tein official recommended data for the prius3 generation.
It feels harder than before, but it is tougher, and the road feel is more obvious than before. Generally, the road noise of potholes has not changed, and the oversized potholes are much better than before. The stability is improved, and the turning roll is significantly reduced. It should be possible to turn at a higher speed, although it has not been tested. The disadvantage is that the comfort is not good, but it is acceptable compared to the improvement of road adaptability. The stroke of this set of shock absorbers is smaller than that of the original factory, the spring is harder than the original factory, and the feeling from the potholes on the road is obvious. That’s all for now, I may have more feelings to share with you in the future, hoping to give some experience to friends who like to modify.

 

It's been over 2 weeks since the coilover shock was replaced and some adjustments have been made during this time, including re-tightening loose screws. Now it is not as hard as it was at the beginning, and it feels very comfortable. It can even press through the pits and bulges on the familiar road at a faster speed than before, and pass it with great tenacity without jumping or swinging the buttocks. Only one problem is that when the rear wheel passes the bridge depression, I think the damper barrel stretches beyond the limit and makes a very loud noise. I don't know if the body should be lowered, if the rear springs are lowered, will it cause the center of gravity to shift back. .

 

The front shock absorber assembly and rear shock absorber strut were replaced before. The front shock absorber performed very well. As mentioned before, the rear shock absorber has no noise on the general road surface and is very quiet and comfortable, but it can quickly pass through concave corners. When there are potholes (such as the connection between roads and bridges), the rear shock absorbing strut will make a lot of noise due to stretching to the limit. At that time, the length of the strut has been adjusted to the limit. The maximum safe screw-in length recommended by the manufacturer is 3cm. I Only 1cm was used.
Today, I replaced the matching springs from Tein and adjusted them to the longest state. The rear body dropped by about 2.5-3cm. There is no longer the noise problem. The only shortcoming is that the body is lowered and the height of the front shock absorber has to be lowered to make it more comfortable. The car looks coordinated. Maybe the shock absorbers are modified to lower the body. This may improve the stability of the body and reduce the roll when cornering at high speed, but it will affect the passing performance of the body.
If there was a way to lengthen the rear spring, maybe it would be perfect.

 

By the way, the quality of this shock absorber is very good. It has not been damaged after many collisions and looks very strong. The weight is also a bit heavier than stock.

 

At the same time, there is another problem. The k value of the rear spring seems to be changing. That is, the k value is small at the beginning of compression. When the compression is halfway, the k value will suddenly increase. When passing a speed bump, it feels different from the stock one.
Not what I like

 

This is what it looks like now, with tein struts and springs front and rear. A=65cm, B=67cm, AB was 68cm before, and the rear spring was stock at that time. The rear spring has been adjusted to its longest position, and it seems that the adjustment range at the rear is not as wide as that at the front.