Clocking Koni Shocks

Discussion in 'Fiesta ST Chassis Upgrades' started by Methane Herder, Nov 20, 2015.

  1. Prior to having the Koni rear shocks installed, I was going to have them dyno'd. Then I realized that I probably won't go through the motions of testing, removing,testing, etc. I just wanted to make sure that they both were doing the same amount of work. So after setting both to wide open, I measured the time it took to go from fully compressed to fully extended. That was about 9 seconds.
    Then I started turning up the rebound on one till I got to about 15 seconds. That was about 1.25 turns on that one.
    On the second one, it was about 1.5 turns.
    I realize that these times are dependent on the gas temperature at the time. It seemed to work for my purposes though.
    After installation I noticed a lot of thumping from the rear. After I got home I did some checking and found that the bottom cross bolts were not very tight. They were only about half as tight as what they should have been (115NM). A little torque wrench work and all seems well now.
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  3. As an addendum, it looks like the stock shocks may not have been tightened sufficiently. There was evidence that the sleeves in the lower bushings had been rubbing on the cross bolts. That would indicate to me that there was insufficient clamping force by the bolts. They may have loosened some over time or were not torqued sufficiently from the get go.
    Either way, the new shocks, tightened sufficiently are quieter than I remember the stock shocks.
  4. stuntdoogie

    stuntdoogie Active Member

    Do you have koni street or sport in the rear only or all around?
  5. I only have the sports on the rear now. I'll pick up the fronts after the first of the year.
  6. stuntdoogie

    stuntdoogie Active Member

    How does the car handle with oe struts in front. Do you experience more understeer on hard cornering? Does it feel stable on cornering while going over imperfections on the road?
  7. I have to preface my answer with the fact that the front struts have 31k miles on them.
    The car is a little unbalanced due to the front still having more compression damping than rear. There seems to be a little more willingness for the front to side step some when you corner in a turn with some ripples in the pavement.
    The rear seems even more planted now. You can definitely feel the back being more compliant. Hence more grip.
    Nothing scary, just different.
  8. Smokin

    Smokin Active Member

    You have to take a cone drill bit and enlarge the shock bolt hole up in the chassis. That will eliminate that thump. It was a big deal a year ago when guys started adding aftermarket shocks. They tried rubbers pads and all kinds of things. I drilled out the hole and has worked quite well.
  9. reddog99

    reddog99 Active Member

    Your description sounds like the way my car felt before I replaced the shocks at 46k. It tended to skitter over bumps around corners. It's definitely feels more "planted" now.

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