thumping coming from under my car after lowering??? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Devens240 · 07-16-2008, 06:14 PM

ok. So i recently lowered my S13 hatch with agx struts and Eibach sportline springs. now when i sit at an idle i hear/feel this loud thumping right beneath the center console. it also happens when i turn to the right. are my tranny mounts causing this? thankyou
Deven

alkemyst · 07-17-2008, 07:45 PM

being it's center console, it could be. It could be a combination of motor mounts and tranny. I didn't notice my tranny mount bad until I did my suspension. Then every speedbump I could feel it in the stick shift.

Devens240 · 07-17-2008, 08:51 PM

yeah its not so much in the stick. i can just feel something slamming against the undercarriage of my car when it idles low or i take a right turn fast

JRas · 07-17-2008, 10:28 PM

subframe bushings?

maybe check to see if the trans mounts are loose? maybe the mount is just worn.. could go nismo mounts

Devens240 · 07-19-2008, 01:22 PM

i ust put energy suspension bushings in the subframe. but that wouldnt make it thump

SexPanda · 07-19-2008, 01:31 PM

Well, having a stiff subframe and stock tranny/ motor mounts, you could be having somewhat of a see-saw effect, with the tranny moving up and down, while the subframe is stationary.

You'd be suprised how bad tranny and motor mounts can get in those old 240's.

HyperTek · 07-19-2008, 01:32 PM

does your stick shift shake alot???

Devens240 · 07-20-2008, 07:49 PM

the stick shakes some, im going to buy a tranny mount and put it in. should i go with nismo?

alkemyst · 07-21-2008, 08:51 PM

If you drive hard I'd go Nismo, SPL, etc...I like my Nismo.

DMaxUSA · 07-22-2008, 11:29 AM

Peak Performance Transmission Bushings are also good. They come in Street and Race versions.

iHeartTheTouge · 07-22-2008, 11:58 AM

Quote:

Originally Posted by DMaxUSA

Peak Performance Transmission Bushings are also good. They come in Street and Race versions.

i went with the Race version mount from Peak Performance, good stuff

ericcastro · 07-22-2008, 12:09 PM

I think Its your carrier bushing. Yes, you said you feel it at idle, but I would check it out too, since your gonna be down there.

If it is, one piece driveshaft for an extra $100.00 more than the carrier bushing job will cost.

Eitherway, you should jack it up and have a look, its easy enough.

Devens240 · 07-23-2008, 11:15 AM

so if the carrier busing is bad it will move from side to side at the knuckle?

Dream240 · 07-23-2008, 12:31 PM

Sounds like you got a mount problem. check your engine mount bolts to make sure nothing has come loose. Also to see if you need new mounts:

check the engine mounts by grabbing the sides of the engine and try rocking it. Do this while to car is shut off! Does the engine rock alot? Pretty easily? Also can you mimic the thumping sound by doing this?

For the tranny mount, if you've got no gap in the center between the two sections, get a new one. Nismo is the best IMO for daily driving and track use.

ericcastro · 07-23-2008, 01:55 PM

Quote:

Originally Posted by Devens240

so if the carrier busing is bad it will move from side to side at the knuckle?

Yeah. So if its not the mounts. then its probably this. Have you had any exhaust work done lately? could it just be exhause vibrating agains he body?

alkemyst · 07-23-2008, 05:51 PM

My sway bar touches the body sometimes on a hard turn.

Dream240 · 07-23-2008, 11:04 PM

Quote:

Originally Posted by ericcastro

Yeah. So if its not the mounts. then its probably this. Have you had any exhaust work done lately? could it just be exhause vibrating agains he body?

Well he's saying that the thumping is coming from the car at idle. The carrier bearing isn't rotating during idle.

The main cause for the driveshaft to be thumping against something is due to a bad tranny mount allowing the tranny to sag, thus allowing the front drive shaft to sag. Even if the carrier bearing is bad, the carrier mounting brackets will not allow that part to sag while stationary. Unless the two bolts holding those brackets are loose. The rear drive shaft piece would sag due to bad subframe bushings.

And if you've replaced those with upgraded bushings, you've raised the drivetrain UP. bringing it closer to the frame. Can create all kinds of rattles.

Good luck.

Devens240 · 07-24-2008, 10:29 AM

ok thankyou for all the help. ill put it on on a lift at work tomorrow and check all the mounts.

07-16-2008, 06:14 PM	#1
Devens240 Zilvia Junkie Join Date: Dec 2007 Location: Washington Age: 35 Posts: 413 Trader Rating: (1) Feedback Score: 1 reviews	thumping coming from under my car after lowering??? ok. So i recently lowered my S13 hatch with agx struts and Eibach sportline springs. now when i sit at an idle i hear/feel this loud thumping right beneath the center console. it also happens when i turn to the right. are my tranny mounts causing this? thankyou Deven

07-17-2008, 07:45 PM	#2
alkemyst Zilvia Addict Join Date: Oct 2003 Location: Florida Age: 54 Posts: 868 Trader Rating: (0) Feedback Score: 0 reviews	being it's center console, it could be. It could be a combination of motor mounts and tranny. I didn't notice my tranny mount bad until I did my suspension. Then every speedbump I could feel it in the stick shift. __________________ Now my Kensai, I curse you to be a Ronin and with the my remaining spirit I, beseech Chimata-No-Kami, to have you wander through time and distance lands, seeking a new master.

07-17-2008, 10:28 PM	#4
JRas Zilvia FREAK! Join Date: Jul 2007 Location: Arizona Age: 36 Posts: 1,503 Trader Rating: (2) Feedback Score: 2 reviews	subframe bushings? maybe check to see if the trans mounts are loose? maybe the mount is just worn.. could go nismo mounts __________________

07-19-2008, 01:31 PM	#6
SexPanda Post Whore! Join Date: Jun 2007 Location: Where ever there is free beer Posts: 3,239 Trader Rating: (0) Feedback Score: 0 reviews	Well, having a stiff subframe and stock tranny/ motor mounts, you could be having somewhat of a see-saw effect, with the tranny moving up and down, while the subframe is stationary. You'd be suprised how bad tranny and motor mounts can get in those old 240's. __________________ BRAND NEW GReddy PRofec E-01 EBC for sale, Cheap!

07-19-2008, 01:32 PM	#7
HyperTek Post Whore! Join Date: Mar 2003 Location: Cali Posts: 13,224 Trader Rating: (3) Feedback Score: 3 reviews	does your stick shift shake alot??? __________________ Keep it Classy

07-17-2008, 08:51 PM	#3
Devens240 Zilvia Junkie Join Date: Dec 2007 Location: Washington Age: 35 Posts: 413 Trader Rating: (1) Feedback Score: 1 reviews	yeah its not so much in the stick. i can just feel something slamming against the undercarriage of my car when it idles low or i take a right turn fast

07-19-2008, 01:22 PM	#5
Devens240 Zilvia Junkie Join Date: Dec 2007 Location: Washington Age: 35 Posts: 413 Trader Rating: (1) Feedback Score: 1 reviews	i ust put energy suspension bushings in the subframe. but that wouldnt make it thump

07-20-2008, 07:49 PM	#8
Devens240 Zilvia Junkie Join Date: Dec 2007 Location: Washington Age: 35 Posts: 413 Trader Rating: (1) Feedback Score: 1 reviews	the stick shakes some, im going to buy a tranny mount and put it in. should i go with nismo?

07-21-2008, 08:51 PM	#9
alkemyst Zilvia Addict Join Date: Oct 2003 Location: Florida Age: 54 Posts: 868 Trader Rating: (0) Feedback Score: 0 reviews	If you drive hard I'd go Nismo, SPL, etc...I like my Nismo. __________________ Now my Kensai, I curse you to be a Ronin and with the my remaining spirit I, beseech Chimata-No-Kami, to have you wander through time and distance lands, seeking a new master.

07-22-2008, 11:29 AM	#10
DMaxUSA Zilvia Junkie Join Date: Jun 2008 Location: Torrance, CA Posts: 569 Trader Rating: (0) Feedback Score: 0 reviews	Peak Performance Transmission Bushings are also good. They come in Street and Race versions.

07-22-2008, 12:09 PM	#12
ericcastro Post Whore! Join Date: Sep 2006 Location: Malibu Age: 48 Posts: 7,033 Trader Rating: (7) Rides Gallery: ericcastro Feedback Score: 7 reviews	I think Its your carrier bushing. Yes, you said you feel it at idle, but I would check it out too, since your gonna be down there. If it is, one piece driveshaft for an extra $100.00 more than the carrier bushing job will cost. Eitherway, you should jack it up and have a look, its easy enough.

07-23-2008, 11:15 AM	#13
Devens240 Zilvia Junkie Join Date: Dec 2007 Location: Washington Age: 35 Posts: 413 Trader Rating: (1) Feedback Score: 1 reviews	so if the carrier busing is bad it will move from side to side at the knuckle?

07-23-2008, 12:31 PM	#14
Dream240 Nissanaholic! Join Date: Dec 2002 Location: Inland Empire, California Age: 46 Posts: 2,188 Trader Rating: (8) Feedback Score: 8 reviews	Sounds like you got a mount problem. check your engine mount bolts to make sure nothing has come loose. Also to see if you need new mounts: check the engine mounts by grabbing the sides of the engine and try rocking it. Do this while to car is shut off! Does the engine rock alot? Pretty easily? Also can you mimic the thumping sound by doing this? For the tranny mount, if you've got no gap in the center between the two sections, get a new one. Nismo is the best IMO for daily driving and track use. __________________ Don't mess with my monkey...he's loaded.

07-23-2008, 05:51 PM	#16
alkemyst Zilvia Addict Join Date: Oct 2003 Location: Florida Age: 54 Posts: 868 Trader Rating: (0) Feedback Score: 0 reviews	My sway bar touches the body sometimes on a hard turn. __________________ Now my Kensai, I curse you to be a Ronin and with the my remaining spirit I, beseech Chimata-No-Kami, to have you wander through time and distance lands, seeking a new master.

07-24-2008, 10:29 AM	#18
Devens240 Zilvia Junkie Join Date: Dec 2007 Location: Washington Age: 35 Posts: 413 Trader Rating: (1) Feedback Score: 1 reviews	ok thankyou for all the help. ill put it on on a lift at work tomorrow and check all the mounts.