98 LS loud bang on speedbump in front after lowering! - ClubLexus - Lexus Forum Discussion


LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

98 LS loud bang on speedbump in front after lowering!

Reply
 
 
 
Thread Tools Search this Thread
Old 08-05-14, 11:12 PM   #1
davincity
Driver School Candidate
Thread Starter
 
Join Date: Dec 2012
Location: CA
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Default 98 LS loud bang on speedbump in front after lowering!

So I put the tanabee springs 2.0 drop in front and 1.5 in the back and now whenever I go over a bump at low speed or high speed I hear a loud bang up front as if the tire is hitting the frame or something I'm not sure. I also replaced the struts. Please help! 225k miles runs like a dream and always dealer maintained.
davincity is offline   Reply With Quote
Old 08-06-14, 12:16 AM   #2
kevvo
Rookie
 
kevvo's Avatar
 
Join Date: Nov 2013
Location: Victoria (Australia)
Posts: 73
Thanks: 0
Thanked 0 Times in 0 Posts
Default

If you look underneath the car is any part of it lower than the height of where the rim meets the tyre?
kevvo is offline   Reply With Quote
Old 08-06-14, 10:15 AM   #3
timmy0tool
Lexus Champion
iTrader: (5)
 
timmy0tool's Avatar
 
Join Date: Sep 2008
Location: 909/626/714, SoCal
Posts: 3,953
Thanked 20 Times in 19 Posts
Default

did you trim your bump stops when you installed the springs? could also be your upper a-arm hitting the inner wheel well but that is not likely since a 2" drop is very small.

also check if all the parts are nice and secure, swaybar, strut mount, etc.
timmy0tool is offline   Reply With Quote
Old 08-06-14, 04:33 PM   #4
PureDrifter
BahHumBug
iTrader: (10)
 
PureDrifter's Avatar
 
Join Date: Aug 2004
Location: California
Posts: 23,752
Thanked 13 Times in 12 Posts
Default

a-arm hitting the shock tower for $500 alex.
PureDrifter is offline   Reply With Quote
Old 08-06-14, 08:18 PM   #5
Caniac14
Driver
 
Join Date: May 2014
Location: NC
Posts: 149
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by timmy0tool View Post
did you trim your bump stops when you installed the springs? could also be your upper a-arm hitting the inner wheel well but that is not likely since a 2" drop is very small.

also check if all the parts are nice and secure, swaybar, strut mount, etc.
I can confidently say that it is the UCA(a-arm) hitting. My driving height is about 2-3" drop and I hit every time I enter my driveway unless I literally creep in.

My suggestion would be to take them at an angle if you aren't going to scrape, and be slow about it.
Caniac14 is offline   Reply With Quote
Old 08-06-14, 10:56 PM   #6
RA40
Moderator
iTrader: (6)
 
RA40's Avatar
 
Join Date: May 2003
Location: California
Posts: 17,686
Thanked 21 Times in 20 Posts
Default

Mine is at 2.5" drop up front and I've not hit the UCA. Possible on a hard compression but if the bump stop was cut at the first tapered neck, I don't see how it can contact in the wheel well. Mine is good for 2.25" of clear suspension travel. If the bump stops were not cut, that that leaves about 1/2-1" of suspension travel before it bottoms out. If it has an RCA installed, then yes it will be closer and possibly contact the wheel well. Easy to tell because the UCA will have left a mark.

My thought is that the caster bar bushings are very unhappy in this new position. The other big noise could be the engine and tranny bouncing around. Uncut bump stop, speed bump, engine and tranny get bounced up then back down. Check the engine and tranny mount.
RA40 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Need help, loud bang diff/driveshaft/controlarm? Norman9208 Suspension and Brakes 2 07-04-15 10:24 AM
Rear suspension banging Bix49 Suspension and Brakes 1 03-03-15 09:11 AM
Loud Bang Norman9208 SC- 1st Gen (1992-2000) 3 11-10-14 05:43 AM
Audio ?? wrisperj LS - 4th Gen (2007-2017) 4 07-10-11 11:54 AM
Loud bang!!! lkapimp216 GS - 3rd Gen (2006-2011) 14 12-17-10 07:59 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -7. The time now is 09:25 AM.


Copyright © 2000-2017 Internet Brands, Inc. All Rights Reserved
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: