TRD shocks and springs

[drako323]

NoHachi Wrote: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.

Best is to remove a part of the strut between the perch and the start of the thread, so you can weld this part back on. It's a bit tricky to align it exactly but this way you don't have to make a new thread in the strut, which would require a lathe (or some pretty rare taps I have never seen). One way to align it is to fit the insert in the strut, then the cut part over it, tack weld, remove the insert and then make the complete seam weld (always in steps to avoid too much warp).