Clunking from under car - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

SkylineDriven · 01-31-2004, 08:16 PM

I just installed subframe collars and went to test it out... I'm noticing alot of clunking types of sounds now.... maybe the sounds were dampened by the stuck rubber subframe thingies, but I guess using the spacers just made all the sounds more apparent... I know that I installed them correct. Those suckers are in there TIGHT now. I even tried retightening them after I drove it.

When I jack up the rear differential and lower it, there is more or less no visible movement where the collars are.

Do the collars add more noise? Or is it being solid just finally unmasking what problems existed before (soundwise).... Let me describe what its doing.

When there is torquing and untorquing through the drive train (gas in, gas out) I hear a clunk/thunk... kinda like if someone had a rubber mallet and just hit something... it is coming from the rear..... also if I just rapidly tap the gas VERY lightly... kinda like if you tap your foot on the floor to the beat of music, but just doing the same motion on the gas pedal... you can hear it clunk with the rythm of your tapping.... and mind you, this is VERY light tapping. Enough to get some gas out, but not enough to change your acceleration.

And now also I notice that occasionally, even shifting through the gears will produce that clunking sound. I'm thinking that its coming from the transmission or something but I dunno... maybe tranmission mount? Or something inside the transmission itself? Or I dunno... what do you guys think? I think I have described it in pretty good detail.

Flybert · 01-31-2004, 10:58 PM

The clunk is the spacers themselves. You have metal to metal contact now. When the backend squats, it's squatting on to an unpliable subframe spacer making the clunk you are hearing. Don't worry about it. You get used to it.

holisticbeatz · 02-01-2004, 12:58 AM

How strange, the reason why I installed subframe spacers was because of clunking noises.

VitaminT · 02-01-2004, 10:39 PM

If you have an aftermarket exhaust it could be it hitting the tunnel under the car. After I installed my 3" Greddy it did that until I did some adjusting.

SkylineDriven · 02-01-2004, 10:50 PM

I had rookie2nr drive my car today... he doesn't hear the clunking... my exhuast does vibrate alot tho.. i found where its hitting but still cant seem to do anything about it. i guess tis something i'll have to deal with. and maybe the clunking is just wahat everyone has been telling me.. cuz the spacers are metal... but i think il get poly bushings tho.. to see if that helps.

01-31-2004, 08:16 PM	#1
SkylineDriven Leaky Injector Join Date: Dec 2003 Location: Memphis, TN Posts: 67 Trader Rating: (0) Feedback Score: 0 reviews	Clunking from under car I just installed subframe collars and went to test it out... I'm noticing alot of clunking types of sounds now.... maybe the sounds were dampened by the stuck rubber subframe thingies, but I guess using the spacers just made all the sounds more apparent... I know that I installed them correct. Those suckers are in there TIGHT now. I even tried retightening them after I drove it. When I jack up the rear differential and lower it, there is more or less no visible movement where the collars are. Do the collars add more noise? Or is it being solid just finally unmasking what problems existed before (soundwise).... Let me describe what its doing. When there is torquing and untorquing through the drive train (gas in, gas out) I hear a clunk/thunk... kinda like if someone had a rubber mallet and just hit something... it is coming from the rear..... also if I just rapidly tap the gas VERY lightly... kinda like if you tap your foot on the floor to the beat of music, but just doing the same motion on the gas pedal... you can hear it clunk with the rythm of your tapping.... and mind you, this is VERY light tapping. Enough to get some gas out, but not enough to change your acceleration. And now also I notice that occasionally, even shifting through the gears will produce that clunking sound. I'm thinking that its coming from the transmission or something but I dunno... maybe tranmission mount? Or something inside the transmission itself? Or I dunno... what do you guys think? I think I have described it in pretty good detail. __________________ TractionOptional (dot) com

02-01-2004, 12:58 AM	#3
holisticbeatz Zilvia Addict Join Date: May 2003 Location: CALIFORNIA Posts: 988 Trader Rating: (1) Feedback Score: 1 reviews	How strange, the reason why I installed subframe spacers was because of clunking noises. __________________ Trust and I don't mean GReddy.

02-01-2004, 10:50 PM	#5
SkylineDriven Leaky Injector Join Date: Dec 2003 Location: Memphis, TN Posts: 67 Trader Rating: (0) Feedback Score: 0 reviews	I had rookie2nr drive my car today... he doesn't hear the clunking... my exhuast does vibrate alot tho.. i found where its hitting but still cant seem to do anything about it. i guess tis something i'll have to deal with. and maybe the clunking is just wahat everyone has been telling me.. cuz the spacers are metal... but i think il get poly bushings tho.. to see if that helps. __________________ TractionOptional (dot) com

01-31-2004, 10:58 PM	#2
Flybert Post Whore! Join Date: Mar 2003 Location: none Posts: 3,862 Trader Rating: (7) Feedback Score: 7 reviews	The clunk is the spacers themselves. You have metal to metal contact now. When the backend squats, it's squatting on to an unpliable subframe spacer making the clunk you are hearing. Don't worry about it. You get used to it.

02-01-2004, 10:39 PM	#4
VitaminT GhettoBoost Join Date: Aug 2003 Location: AL Posts: 248 Trader Rating: (0) Feedback Score: 0 reviews	If you have an aftermarket exhaust it could be it hitting the tunnel under the car. After I installed my 3" Greddy it did that until I did some adjusting.