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Rough ride


wildy55

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Hi

Have just put adjustable coilovers on the car and the ride's interesting, to say the least...

There's only about an inch of travel and it 'bobbles' on smooth roads and bounces on rough. Have the spare set of 14 wheels with 195/70 tyres so plenty of 'give' there. Shocks aren't new and I don't know how old they are. Where do I start?

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They're 5kg front and 6kg rear.

I've added some height front and rear and cut the bumpstop rubbers down so now there's about 50mm of travel. I'm thinking shocks, too, as it reacts to every bump rather than soaks it up. By bobbles I mean constant small up and down movements. It's not floating over the road but following every contour. What's the thinking on new shocks (bearing in mind the car will only be used on the street). What's the cheapest to dearest?

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I had KGB exel gas shocks on mine, were great with 220lb king springs but when I went to coil overs with 340lb(6kg) springs the kyb's were completely over powered and the car bobbled and shimmied on the smoothest of roads. I have since switched to kyb agx 4 way adjustables, these required a spacer as they are shorter and strut top hole drilled bigger. Very happy with them.

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You simply have springs that are too firm for your particular preferences. 

 

As a result, the wheel cannot move up and down quickly enough over the bumps on the road to give a smooth ride.  This forces the car to do it and describes your bobbing.  New shocks won't solve the problem, although if shot will still need replacing.

 

Tokico springs are 180lb/in front and 200 rear. Kings are a bit less. These are firm street springs (as standard spring rates are about half of this). Some will argue tokico's are too firm for reasonably comfortable driving (hear all the moaning on hybridZ). You have gone to 280lb/in front and 336 rear springs. :o That's more for track work / hard street driving and performance, not comfort.

 

Either, keep the tyre pressures low and get used to it, or go to 3-4kg springs for smoother ride.

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They're 5kg front and 6kg rear.

I've added some height front and rear and cut the bumpstop rubbers down so now there's about 50mm of travel. I'm thinking shocks, too, as it reacts to every bump rather than soaks it up. By bobbles I mean constant small up and down movements. It's not floating over the road but following every contour. What's the thinking on new shocks (bearing in mind the car will only be used on the street). What's the cheapest to dearest?

 

As mentioned above if you're only street driving those springs are too hard. I have exactly the same as your set up, same kg springs and even cut down bump stops as you mentioned. New shocks or better ones will help but those are serious racing springs. Looking at footage of my car on the track it sits very flat through corners will little to no roll at all. Just what you want for racing, not for street use.

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