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Nitron NTRs newly fitted but they 'clunk, of small potholes - Ride/Handling/Suspension/Brakes/Wheels/Tyres - The Lotus Forums Jump to content
MartinHarris

Nitron NTRs newly fitted but they 'clunk, of small potholes

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Just had some single way adjustable Nitron NTRs fitted to me 2001 Elise along with new balljoints and bushes all round plus full Geo set up.

All lovely handling but I get a distinct 'clunk' when I hit the smallest of potholes or manhole covers. I took it back to the garage (Porsche specialist rather than Lotus as there isn't one locally) and he thought one bolt wasn't tighten properly but it still does it.

Anyone come across this before??

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Assuming the ball joints and bushes were done correctly...

 

I'm guessing either the body of the shock is hitting on the bracket on the chassis at full bump, or the springs are a bit to o short and as the suspension droops, the spring suddenly becomes free and then clunks back into place. 

 

I've seen the USA Elise front upper shock mount brackets are too narrow for Nitrons.

29214d1148863334-nitron-track-dampers-sp

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But the shock to bracket distance doesn't change on a bump and if the arms swing in an arc, the shock should move away from the bracket on a bump as it pivots. (minimal) Unless the shock is already touching.

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I seem to remember some of the front brackets had an extra lug on them for the abs on some cars and may require a little fettling if making contact with the wishbone.

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But the shock to bracket distance doesn't change on a bump and if the arms swing in an arc, the shock should move away from the bracket on a bump as it pivots. (minimal) Unless the shock is already touching.

 

The shock hits on droop.

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Thanks for advice chaps. Will have a look tomorrow and see if it looks like it's hitting!

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That makes sense Travis. I wonder if the bracket could be relieved slightly? It seems that everyone that puts new shocks on that are aftermarket gets the same issue.

I doubt that relieving the bracket away from the shock body would cause a problem as the bracket is working against primarily upward force?

 

Not ideal by a long shot.

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So had a look today and Travis is definately right at least in part. The top of the shocks is definately hitting the bracket and had splayed them out a bit like his photo. I eased them out a fair bit further but am still getting the clunk! Don't fancy grinding the bracket away as I don't want to weaken it.

Wonder if someone makes wider ones??

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Where did you get them from ?

My understanding was that Nitrons come in two different body widths?

I thought the ones with a wider body were supplied with new top mounts.............

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Got them from Hanger111 so would have thought they knew what they were ordering? Might check with Nitron though. Thanks for the tip.

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Be nice if they brought that to your attention in the first place.

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