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Old 08-07-2001, 10:03 PM   #1
munkis
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Default Low speed clunk felt in floor board, anyone else?

Mods Ver 5 susp
whitline adj rear bar
ganzflow
stromung catback

Anywhooo I notice a little while ago a slight clunk in the front end, and it has gotten progressivly worse, now it is real bad, relatively slow speeds, jarring bumps I feel it in the floor, and when going up or down steep driveways when stopping I feel the clunk, I havent even looked at anything yet, seems like left front...Its really bad when going slow 1st/2nd gear coasting to a stop going over sharp bumps.

Anyone have anything similar?? Im very lazy and hate having to work on my car.

Thanks

Jay McDade
Tri-State Meet Whore
Auto Tech--Lincoln/Mercury/Jaguar
www.hometown.aol.com/impreza25rs2000
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Old 08-07-2001, 10:11 PM   #2
trhoppe
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Lightbulb check your lug nuts

Make sure your lug nights are tight on that wheel
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Old 08-07-2001, 10:35 PM   #3
Patrick Olsen
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Hmmm, I actually have something similar (and, no, it ain't the lug nuts - at least not in my case). Pretty much as you described - a clunk/thunk/knock kinda noise from the front end, with a corresponding little bump felt in the soles of my feet. In my car I can actually hear it even at highway speeds (if I have the stereo turned down), but the feeling through the floorboard isn't as prevalent at speed.

On Saturday I saw something that I had never seen before. I was jacking up the front driver's side to swap on my auto-x tires, and as I lifted the car the wheel seemed to kind of "ratchet" down as the suspension extended. This was accompanied by the same clunking noise I hear while in motion. I did it again, and attempted to videotape it, but me holding the camera while trying to operate the jack created too much jiggling in the picture to really see the weird ratcheting effect. The camera did clearly pick up the noise, though.

I have a couple of hypotheses, but haven't had a chance to really prove anything yet. Option one is very excessive stiction in my DMS struts, which I've thought for a while were screwed up. I was discussing this with wac this weekend (he's ridden in the car and can vouch for the very noticeable noise) and one thing we thought of is that the amount of camber I'm running up front (-2.25deg) combined with the reduced flex of the STi top mounts might be causing the strut shaft to bind up somewhere. Just a guess.

The only other thing I can think of is that the front control arm bushings are going, but it seems rather unlikely that the bushings on both sides of the car would go bad simultaneously. The only way to check that would be to unbolt the struts from the spindles and cycle the control arm. Of course if I do that my alignment will be off after getting everything back together (I know, I know, I could mark the camber adjusting bolt and just put it back to that mark, but it still won't be completely accurate - that's my b!tchy story and I'm stickin' to it! ). I'll probably get around to that in the next week or so.

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 08-08-2001, 08:56 AM   #4
AndyHidley
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I have it also, its the bushings on the sway bar. Mine did it slightly with stock, now with 22mm front and urathane bushings its worse. I does it always over the first bump in the trip, then after that only once in awhile. Put in some appropreate grease for rubber/urathane in the joints..
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Old 08-08-2001, 11:26 AM   #5
RS'ted
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I have the V5's too, but that noise was coming from the rear of the car on mine. It drove me nuts until I finally figured it out ! As Pat theorized on his DMS's, it was "stiction" between the strut shaft and top seal. I sprayed the area with a lube containing teflon and voila !, noise was gone. In fact, you can actually feel the difference ! The suspension is much more compliant now.

Anyway, give it a try and see if it helps.........doesn't seem like a great solution but then, it doesn't seem like there is any better one, either.

Ken M
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Old 08-08-2001, 11:53 AM   #6
Subie Gal
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Lightbulb

it's the struts...

my DMS do it at low speeds...

you can try lubing as suggested... that may alleviate the clunking, thumping you're feeling... worked for me the first few times i heard this clunking...

but....
in my case the DMS are ready to be serviced.
this suspension is so complicated... you cant just slap it on and drive and forget about it...
there are rings on the strut that expand over time, (mine have 40k miles on them... few k of rally miles)
when these rings expand, you begin to feel the movementof the strut... when the strut moves, it hits the rings and 'thumps' - also, my gaskets/seals need replacing on the DMS...

this may not be the case w/all... and i've had Dave Clark (dms_usa) check my car... i am not hurting my car or suspension at all... just needs a check up

hope this helps.
J.
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Old 08-08-2001, 12:16 PM   #7
WRXwannbe
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Yep It's your struts.

i'm 100% possitive.

Those RS struts are as weak as Tinfoil. You prolly blew one out. I had blown 3 out of 4 on my car. Only solution is to get new struts.
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Old 08-08-2001, 03:06 PM   #8
AndyHidley
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Well if it is struts your in luck..
I had a 2000 RS and bought some struts as spares. They have 500 miles on them and still have the cosmoline on them. I have a set of 4 for sale in the private classifieds. Just search for "AndyHidley" and "strut" I traded in my car for a WRX and dont need them. No reasonable offer will be refused..

Last edited by AndyHidley; 08-08-2001 at 03:12 PM.
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Old 08-08-2001, 03:29 PM   #9
Patrick Olsen
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Ken - I had thought of lifting the dust boots and spraying some lubricant on the shaft/top seal area, but I wasn't sure what stuff to use. What was this "lubricant containing Teflon" that you used?

Pat
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Old 08-08-2001, 04:14 PM   #10
RS'ted
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Pat,

The stuff is called Tri-Flow. I only found the source of the noise and lubed them last week, so it's still a little early to know how long it will last. Given the large seal area on these type of struts, I guess it shouldn't be surprising how much friction they can generate. Here is a cut and paste from a review of the stuff I found: "Tri-Flow Superior Lubricant provides twice the lubricating power of most competitive brands. Its light viscosity allows for deep penetration into hard to reach moving bicycle parts. High-grade petroleum oils and Teflonā provide optimum lubrication under extreme temperatures (-60° to 475° F) and humidity. Formulated solvents soften and remove dirt and contaminants, while special additives displace moisture and prevent rust and corrosion. "


Ken
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Old 08-08-2001, 05:03 PM   #11
AndyHidley
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I bet that it wont work. I think it'll make the shaft too slippery and let the gas (nitrogen) leak out... I did that on some strut thingies that hold up some american hoods. Short term fix.
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Old 08-09-2001, 02:08 PM   #12
WRXwannbe
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If you have a warrantee take your car in for repair and insist on them changing the strut. Stop wasting your time. They are BLOWN.

Believe me I know.
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Old 08-09-2001, 02:31 PM   #13
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Warranty what ? They are not "blown". No fluid leak, still have gas pressure in them, how are they "blown" ? It was just stiction due to a dry seal, made more noticeable, I believe, due to the large shaft/seal diameter on these inverted struts.

Ken M
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Old 08-09-2001, 07:14 PM   #14
munkis
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Thanks for the replies...Only one thing for the peeps saying take to the dealer for warranty...and commenting on week rs struts, Oh andy thanks for the offer, but I have VER 5 Suspension

Errrr its so anyong, clunk clunk in the floor errrrr I can feel it too on the highway but like you said pat its not noticable, when im coasting into a street parking spot in front if my house I notice it the most, and when comming to stop lights on bumpy roads.

Ken where exactly did you lubricate....where the shaft goes into the strut?

I too am thinking about sway front sway bar bushings too.

Its so annoying,makes me want to get rid of the car!

Jay McDade
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