TRD shocks and springs

[NoHachi]

Drako is right offcourse (thanks for joining in dude!). I used the 1G approximation, hence the "~" and "approx".

If you run the numbers on the static+dynamic loads you get the following results. I also plugged in better numbers for sprung weight of a stock AE86 and added a margin of 10% to soak up road irregularities during cornering.

Street = 72mm
Semi = 73mm - 74mm
Slick = 74- 76mm
(when using 8kg/mm fronts)

So about 75mm needed on average.
available travel = 155mm - 75mm = 80mm minimum compressed length of spring. So the strut is about 20mm too long to avoid top hat contact.

To make a long story short -> remove 40mm of material "above" the spring perch. Use a 20mm spaces "under" the shock and you should be golden. Captive springs, decent travel and bumpstops to save your shock towers.

The spacers from TRD have a different reason. Not only the stroke is shorter, but so is the shock body. So you also need some spacers under the strut fill up the space. If they are ~20mm long then they are supposed to work with 40mm strut shortening.