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Discussion Starter · #1 ·
Big big No no!! :nono;

I installed these and suffered massive vibration issues. Initially I thought these were unrelated, but after replacing 2 engine mounts, tranny mount, 2 buckled wheels and having teh wheels balanced and aligned the vibration was still there.

The problem was that the drive shafts now point upwards into teh tranny box, causing unnecessary strain on the diff.

I removed the Koni's and replaced with my standard springs.... The drive shafts are back level and the problem has now gone!

4 weeks of hassle down to a lousy set of £90 springs. :evil:
 

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I did warn you about the harshness - but then you have to try these things. I thought the aftermarket tranny mount lifted the engine slightly to keep the driveshaft line within reasonable limits? How much did the koni's slam the car?
 

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Discussion Starter · #3 ·
Konies took it a good 35-40mm lower.

I was happy with teh ride, just not the trampoline effect it had between 40 and 50 mph!!! :eek:

I didnt realise there was an uprated tranny mount, my standard one was broken so I replaced with a standard one ;oops:
 

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GS poly mount - more vibration at idle but I doubt that will bother you:cheesy: Are you still on stock shocks?
 

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Discussion Starter · #5 ·
Shirozina said:
GS poly mount - more vibration at idle but I doubt that will bother you:cheesy: Are you still on stock shocks?
Hmm I may have to check that out! :p

Nah, i dont idle much! :cheesy:

Yep on stocks ;oops:, will be getting Koni's after Xmas... with hopefully flywheel and clutch (which is stating to smell :eek:)
 

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Koni does not make springs.;)

Were there any noises that accompanied this, like whiring noises?
 

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Likely that your shocks are worn and were not able to damp the stiff springs. I'd not be too happy putting 270bhp down with stock springs and worn shocks;oops: - does the front rise up on acceleration?
 

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Someone mentioned in the c900 forum that the angle of the drive shaft was quite important as done properly it should pull the front down on heavy acceleration, can't remember whether they should be angled down or up towards the wheels though:confused:
 

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I guess a spinning shaft with a flexible joint will try to straighten itself out under load?- thus if the shafts point down they will apply a counter force to the turning force which is trying to lift the front?
 

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Speaking from recent personal experience of a -60mm drop with leaky shocks and then a -35mm drop with Konis:- I havn't had any vibration problem.

I HAVE had vibration problems with shoddy wheel balancing.
 

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That's because more aggressive shocks, springs and polybushings etc transmit and amplify any small imbalance.
 

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Hell, the poly trans mount made it more shaky, but I feel like it's worth it. Performance is a give and take relationship.
 

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Discussion Starter · #15 ·
lms said:
Koni does not make springs.;)

Were there any noises that accompanied this, like whiring noises?
Well why have i get a set that cam in a box marked koni?! :confused:
 

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Because koni gets their springs from a co. called vogtland.

Koni does make their own shocks though.
 

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And I love there hotdogs:cheesy: I'm sorry for that I couldn't help myself.
 
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