Adjustable lowering/raising kit for oem Koni shocks | FerrariChat

Adjustable lowering/raising kit for oem Koni shocks

Discussion in '308/328' started by maurice70, Oct 18, 2006.

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  1. maurice70

    maurice70 F1 Rookie

    Jan 25, 2004
    4,333
    Sydney
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    maurice T
    Hi I've just come back from the aligner after totally rebuilding the front suspension(new shocks,recoed steering rack,new suspension bushes,new lower ball joints and new tie rod ends) and the aligner has told me that the left hand side is about 15mm higher than the right hand side.I've never particularly noticed it before but after pointing it out it became obvious.He aligned it as good as he could and the car seems to steer straight and all the work I have done seems to have made the front so much more responsive.He told me that there is a kit available for the koni that can be used to adjust the ride height.Basically he showed me one that was similar to one he was talking about and it looked like a metal pipe slightly larger in diameter as the shock that was externally threaded with a nut that would thread onto it.It sleaves over the shock and I think it is welded to the shock and the threaded nut is what adjusts the spring compression.This kit is installed to each shock by Koni so the shocks have to be sent to them.Anyone heard of this before?
     
  2. ferrarifixer

    ferrarifixer F1 Veteran
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    Jul 22, 2003
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    Where is the discrepancy... chassis rails or wheel arches?

    Double check all tyre pressures/sizes and lower front ball joints tight etc?

    For shock platform upgrade, In Melbourne, use Top performance, Ric Kemp. He fits a locking threaded platform, although Banks in UK do a nicer platform with a finer thread which makes things easier to operate. Don't know for NSW.

    But I'd be more worried about fixing the cause, not the symptom, though....

    What were your spring free lengths like when disassembled on the bench? What about the rates? Did you test?

    It's quite easy to confuse 308 front and rear springs.... the longer spring mounts on the shorter shock absorber... (front), and vice versa... The spring rates are quite similar front and rear... about 200 rear and 180 front, depending a bit on different market/model, but basically close enough to confuse easily.

    Also, it's possible you simply tightened the wishbone/shock rubber bushes up with the suspension on droop one side... make sure the suspension is at ride height before tightening bush bolts.

    Also, possible one/more shock has seized,... bounce the corners.. all 4 move up and down ok?

    Waste of time aligning it with big differences.

    FWIW, if you fit the platforms, it's quite a good mod to run the front and rear springs swapped around... but you need platforms to adjust for this.
     
  3. maurice70

    maurice70 F1 Rookie

    Jan 25, 2004
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    maurice T
    I knew you would chime in Phil :) As with the height it was taken off the wheel arches.I didn't test the springs prior to refitting.All the ball joints are tight.The shocks are new at the front so they aren't seized and the rears do bounce.I did torque up the wishbone arms with the load on them.I put jackstands under the shocks and lowered them to sit on them under load.Top Performance were the guys that the aligner reccomended.Would you know what sort of costs are invloved?The thing is I dont know how far I want to go with all of this.I mean the car seems to drive and steer straight and good.If I have to pull the shocks out again and then send them down to Melbourne I think the costs are going to esculate.I dont have any intention to track the car and there is a big difference to how the car was before.It would track all over the place on uneven roads and it doesn't seem to do it now.I sincerely appreciate all your advice as I know it's coming from a professional opinion .What are the consequences of leaving the car as is?
     
  4. ferrarifixer

    ferrarifixer F1 Veteran
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    Jul 22, 2003
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    Happy to help...

    NEVER assume new parts are ok. Test them. Did you check the rebound adjustment settings of the new shocks before installing them??... (I've never bought new... always rebuilt unless total loss damage or corroded etc). An overly tight rebound can "jack down" a shock.

    DON'T leave it as is...

    15mm difference side to side is huge.. 4 or 5 is ok (7 or 8 with just driver in)... what's it like with you sitting in it too... even worse probably...?

    you need to work out what's happened/why...

    Triple check your work... are all the springs seated properly, are the platform collets in correctly, is the car bent?

    Quick check would be to swap shocks/springs side to side.. could do that yourself in about 45 minutes each end now it's all clean and you're familiar with it.

    Was it wonky before the work? Don't know?

    You need to verify if the chassis is wonky too... put it on a race shop flat patch or bodyshop jig/bench and measure some chassis points as per workshop manual (GT4 manual is ok for referance to wishbone pick up heights). Check the corner weights too?

    if you leave it as it is, it could handle adversely at the limit, which you may not find out until you do an emergency stop and spin into oncoming traffic instead of pulling up or controlling a slide....
     
  5. RP

    RP F1 World Champ

    Feb 9, 2005
    17,667
    Bocahuahua, Florxico
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    Tone Def
    I had the six adjustable Konis put on my Boxer, primarily to lower the car. Carobu sent the shocks to Koni for the rebuild. They also used different springs to achieve the ride height I wanted. I am very satisfied.

    In the case of the Boxer, the body is hand made, so there is a slight difference in the gap at the wheel arches from right to left. It has nothing to do with ride height, it is the varience in the hand made body. And no, the car was never wrecked. Welcome to the world of hand made exotics.

    All you can really do in this case is adjust the ride height at a particular corner of the car to minimize the wheel well gap.

    Possibly this is your solution?
     
  6. ferrarifixer

    ferrarifixer F1 Veteran
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    Jul 22, 2003
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    Hence why I said 4 or 5 mm difference...

    15mm is way too much.

    Typically, if you have poor panel fit and adjustable ride height, you can even tip the chassis slightly one way to be uneven maybe 2 or 3 mm to level out the panel gaps a bit and bring them closer to each other. (355's are terrible for this)

    I would lay a fair bet that the chassis is not level in the same direction a 15mm panel discrepancy indicates.

    Aesthetics should NEVER dominate suspension safety.
     
  7. maurice70

    maurice70 F1 Rookie

    Jan 25, 2004
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    maurice T
    Phil I've just gone and measured up myself in the garage.I'm only getting about just under 10mm lower on the drivers side.Could it be the rear sagging and drooping the front as well?I just put the jack under the right rear jack point and just jacked it up a touch and now they all measure equal.I haven't touched the rear shocks or bushes as yet.As for the new shocks I adjusted them equally as was told. 2&1/2 turns from memory.Both springs are seated right in the collets
     
  8. ferrarifixer

    ferrarifixer F1 Veteran
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    Jul 22, 2003
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    just to clarify... the best way to measure is using a tape measure from the lower lip of the wheel rim, through the centre cap and to the wheel arch.... Don't measure from the ground to the wheel arch.

    or, from the flat patch or car jig bench to the inboard control arm bolt centre.

    Tyre pressures need to be right of course..
     
  9. jm3

    jm3 F1 Rookie

    Oct 3, 2002
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    If you just had all four shocks replaced, measure each springs wire diameter with a calipers (or count the coils).

    Make sure you dont have one rear spring on the front, and the missing front spring on the rear. It happens more often than you think.

    JM
     
  10. maurice70

    maurice70 F1 Rookie

    Jan 25, 2004
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    maurice T
    Thanks again.Thats the way I measured it.Now I took some other measurements again this time the loaded spring height and the unloaded spring heights
    Passenger side loaded spring height:230mm Unloaded height:265mm
    Drivers side loaded spring height :220mm Unloaded height:265mm

    These measurements were taken with the springs and shocks still on the car and by measuring from collet to collet with the car on the ground and then with the car jacked up
    So with these measurements would you say that the drivers side spring has a bit more sag in it?
    Would the platform upgrade fix this or is it cheaper to get new springs?
     
  11. maurice70

    maurice70 F1 Rookie

    Jan 25, 2004
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    JM only the fronts have been done.The rears are still original but just in case someone did it before me I checked the springs for the front and they are the same
     
  12. ferrarifixer

    ferrarifixer F1 Veteran
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    Jul 22, 2003
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    your unloaded height is simply the shock travel on full droop. You need to dismount the springs to measure free length and rate them.

    Sorry, there are no short cuts... dismount them all and check again, i'm afraid.
     
  13. maurice70

    maurice70 F1 Rookie

    Jan 25, 2004
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    Ok will do.I will probably do it with in the next couple of weeks as I've been off work the last two weeks on paternity leave :) and have worked on the car for over a week.If I start working on the car again I'm afraid the big boss wont be to happy :(
     

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