Clunking from rear over rough roads with Penskes NA - LotusTalk - The Lotus Cars Community
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post #1 of 29 (permalink) Old 09-23-2017, 06:15 PM Thread Starter
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Clunking from rear over rough roads with Penskes NA

I bought a pre-owned set of Penske NAs from wirewheel a little while back. Just got the coilovers installed and aligned at the shop.

I'm noticing a minor clunk coming from the rear when going over not so smooth roads. (not potholes). I was told this is common on Penskes?
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post #2 of 29 (permalink) Old 09-23-2017, 06:36 PM
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Originally Posted by brandobot89 View Post
I bought a pre-owned set of Penske NAs from wirewheel a little while back. Just got the coilovers installed and aligned at the shop.

I'm noticing a minor clunk coming from the rear when going over not so smooth roads. (not potholes). I was told this is common on Penskes?
Who told you that? I don't have any clunks with the Penske DAs on race springs.

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post #3 of 29 (permalink) Old 09-23-2017, 06:46 PM Thread Starter
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Who told you that? I don't have any clunks with the Penske DAs on race springs.

San
The shop. Said something about the spherical bearing and some kind of coating that goes bad?
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post #4 of 29 (permalink) Old 09-23-2017, 07:53 PM
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The shop. Said something about the spherical bearing and some kind of coating that goes bad?
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post #5 of 29 (permalink) Old 09-23-2017, 10:08 PM
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I'm local to you. You want to meet up to compare? I also got Penskes.
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post #6 of 29 (permalink) Old 09-23-2017, 10:13 PM Thread Starter
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I'm local to you. You want to meet up to compare? I also got Penskes.
Sure. Perhaps you can sit in my car for a quick drive and tell me if it sounds normal. Jon @ trackspec told me it's "normal" for these to make noise.

I work from home tuesday and can pick you up. (If I recall correctly, you work less than a few miles from where I live)
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post #7 of 29 (permalink) Old 09-24-2017, 09:01 AM
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I'm local to you. You want to meet up to compare? I also got Penskes.
Sure. Perhaps you can sit in my car for a quick drive and tell me if it sounds normal. Jon @ trackspec told me it's "normal" for these to make noise.

I work from home tuesday and can pick you up. (If I recall correctly, you work less than a few miles from where I live)

Sounds good. Just pmed you.
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post #8 of 29 (permalink) Old 10-03-2017, 09:12 AM Thread Starter
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@Nessal

@Nobuyasu Drove me around his car with his Penske NA's that he bought new. his car makes the same clunking as mine.
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post #9 of 29 (permalink) Old 10-03-2017, 02:03 PM
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My stock Lotus suspension used to make a loud clunk at extream travel, but my Penskes never.
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post #10 of 29 (permalink) Old 10-03-2017, 02:34 PM
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My Penske NAs were clunk free as well. Sounds you have another issue going on with the suspension.

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post #11 of 29 (permalink) Old 10-03-2017, 04:36 PM
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Originally Posted by brandobot89 View Post
@Nessal

@Nobuyasu Drove me around his car with his Penske NA's that he bought new. his car makes the same clunking as mine.
Looks like many of you that purchased your penske's through the same group buy as me, about a year ago, aren't having this problem. My primarly DD is an EV (Fiat 500e) so I didn't notice this as I don't get to drive the Elise as much and I'm going from a very quiet car to something naturally loud.

Anyhow @fzust - What can I do to get my shocks checked out?
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post #12 of 29 (permalink) Old 10-03-2017, 04:36 PM
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Oh and it was nice chatting with you yesterday Brandonbot99.
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post #13 of 29 (permalink) Old 10-03-2017, 04:52 PM Thread Starter
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My Penske NAs were clunk free as well. Sounds you have another issue going on with the suspension.
I would also agree, except I had no clunking with my original LSS suspension. After swapping to a used set of Penske NA's, I immediately started to hear clunking. Jon @ Trackspec also mentioned the same..and also mentioned that he's seen a few cars with Penskes that make the clunking.
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post #14 of 29 (permalink) Old 10-03-2017, 07:56 PM
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I have the SA Penskes from the same group buy and mine are clunking about the same as my original LSS shocks.
It is still amazing that they are about as comfortable as the LSS at almost twice the sring rate.
One thing I noticed is that the rears seem to be binding up in the bushings.
The fronts can be rotated freely by hand, but not the rears.
Anyone else have this phenomenon?

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post #15 of 29 (permalink) Old 10-04-2017, 08:59 AM
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One thing I noticed is that the rears seem to be binding up in the bushings.
The fronts can be rotated freely by hand, but not the rears.
Anyone else have this phenomenon?
Are the bushings binding up or are the springs/spring collar touching the chassis? My non-BWR Penske shocks are damn close to touching in the rear. I wonder if this is the clunking people are referring to?
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post #16 of 29 (permalink) Old 10-04-2017, 12:13 PM
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Are the bushings binding up or are the springs/spring collar touching the chassis? My non-BWR Penske shocks are damn close to touching in the rear. I wonder if this is the clunking people are referring to?
Hey Ted, the springs do clear the chassis, even though not by much. But I can't see hard contact anywhere.
It seems to be the bushings which are binding. It is the same on both sides.
I can get them moving with a wrench, but not by hand.
The fronts on the other hand move very easy.
I've only tried this with the suspension unloaded so far.
Might have to see if loading the suspension makes any difference.

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post #17 of 29 (permalink) Old 10-04-2017, 12:45 PM
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Thought Iíd give a quick update on this. After meeting with Brandobot99 a couple nights ago, and finding out that my car has the same noise, I pulled the shocks out last night to inspect them. I have a video I wanted to post during the wee hours of the night, but I fell asleep when moving the video from my camcorder to my computer. Iíll try to get it posted tonight.

Anyhow the short answer that should put this topic somewhat to rest is the shockís spherical bearings (top and bottom) that mount to our chassis/suspension has play that causes the clunking sound. Iím hoping the video was able to capture all this. Iím also bummed out because I found that one of my shocks are leaking 😂. Iím going to ping Fred to see what my options are. So stay tuned.
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post #18 of 29 (permalink) Old 10-05-2017, 07:06 AM
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Is it almost like a clicking when going over bumps? Don't worry about the leak. Mine were leaking as well a few months in and Fred said that it's normal.
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post #19 of 29 (permalink) Old 10-05-2017, 01:44 PM
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I only have a couple thousand miles on my Penske DA's, but there is certainly no clunking ever. The entire car used to crash, clunk, and rattle on rough roads with LSS. The Penske's took away >50% of that noise even with stiffer springs.

And I hope I don't have any leaky dampers! Maybe a small amount is normal, but what kind of leak are we talking about here?
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post #20 of 29 (permalink) Old 10-05-2017, 02:18 PM Thread Starter
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Is it almost like a clicking when going over bumps? Don't worry about the leak. Mine were leaking as well a few months in and Fred said that it's normal.
There's a slight clunking going over bumpy roads. On a 1-10 scale, it's probably about a 3. Definitely noticeable, but not so loud that you think your wheels are going to fall off.
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