Notices
IS F (2008-2014) Discussion topics related to the IS F model

Isf: Handles like chit

Thread Tools
 
Search this Thread
 
Old Jan 11, 2017 | 12:23 PM
  #31  
ForzaF's Avatar
ForzaF
Pole Position
iTrader: (3)
 
Joined: Apr 2014
Posts: 350
Likes: 12
From: London,ONT
Default

If it vibrates like hell I think you could have an issue with your tires like a shifted or snapped belt, maybe tire has a bulge
Reply
Old Jan 11, 2017 | 12:37 PM
  #32  
jspecvtec's Avatar
jspecvtec
Lead Lap
iTrader: (4)
 
Joined: Apr 2008
Posts: 777
Likes: 51
From: CA
Default

285 on 9" wheel?
Reply
Old Jan 11, 2017 | 04:45 PM
  #33  
JDMV8's Avatar
JDMV8
Instructor
10 Year Member
Photogenic
Photoriffic
Liked
iTrader: (6)
 
Joined: Jan 2012
Posts: 1,232
Likes: 207
From: PA
Default

You should get 18K/16K Penskes to fix your problem!!!
Reply
Old Jan 11, 2017 | 07:00 PM
  #34  
ISFPOWER's Avatar
ISFPOWER
Lexus Champion
iTrader: (20)
 
Joined: Sep 2012
Posts: 3,236
Likes: 144
From: NORTH CAROLINA
Default

Originally Posted by JDMV8
You should get 18K/16K Penskes to fix your problem!!!
smoothhhh
Reply
Old Jan 12, 2017 | 01:15 PM
  #35  
tas02's Avatar
tas02
Lexus Test Driver
iTrader: (2)
 
Joined: Jul 2015
Posts: 1,063
Likes: 31
From: WA
Default

After you install new front tires, have your ride height and corner weights set up along with a performace alignment at a competent shop. Only then can you properly evaluate your results.
Reply
Old Jan 12, 2017 | 01:23 PM
  #36  
UKF's Avatar
UKF
Driver School Candidate
 
Joined: Dec 2016
Posts: 24
Likes: 0
From: UK
Default

Originally Posted by LexusfanVA
That is odd to hear, I've only heard great things about the KW. I recently got my 08 ISF and I was shocked at how bad the ride was, especially on imperfections(and in Baltimore there are many). I upgraded to BC Racing coilovers with soft swift spring upgrade of 14/10, then I went to 20/25 from full stiff, so it is rather soft. It now makes for a great DD and is much more comfortable. I will say it may be soft for some, but once we get past winter and into some sporty driving days I can firm it up quite easily. Here is my height with 19" wheels with 35/30 sidewalls.

Perhaps you may need some dampening adjustment or a softer spring setup? I went with 14/10 but I know some like it firmer at 16/12 or even 18/12.
Do those wheels have a tint of blue? They look lovely.

I've got the BCs 14/10s going on Wednesday. Do you know how much drop your running front rear? And does it bottom out on those soft settings?
Reply
Old Jan 12, 2017 | 01:53 PM
  #37  
St4nc3's Avatar
St4nc3
Intermediate
10 Year Member
Liked
Loved
Community Favorite
iTrader: (6)
 
Joined: Jul 2015
Posts: 444
Likes: 31
From: New York
Default

I was having similar issues with the front end vibration when going anything over 55 mph. when i installed my BC coils 18k/14k the road feel got substantially better and going over bumps was much smoother. Mike from Figs suggested this spring rate for me and i don't regret it one bit. my Issue with the front vibration was due to unbalanced high speed tire rotation and needed front alignment. Now with a big unmatched tire sizes that can also play a big roll in feel as well. might want to consider going a bit wider up front to match the new rear tires. i've seen guys in the ISF aggressive fitment thread run 245 front with 285 or 295 rears. Just contributing to finding and resolving your issue. guys on this Site have some great insight on info. won't hurt to start doing a process of elimination to find your solution.
Reply
Old Jan 12, 2017 | 03:03 PM
  #38  
chris07is's Avatar
chris07is
Pole Position
iTrader: (10)
 
Joined: Nov 2007
Posts: 2,761
Likes: 94
From: 818/323/562
Default

eddie, check with jeff (quarius) he's running with kw's as well....
Reply
Old Jan 13, 2017 | 08:03 AM
  #39  
LexusfanVA's Avatar
LexusfanVA
Instructor
5 Year Member
Liked
Loved
Community Favorite
iTrader: (1)
 
Joined: Sep 2016
Posts: 754
Likes: 269
From: MD
Default

Originally Posted by UKF
Do those wheels have a tint of blue? They look lovely.

I've got the BCs 14/10s going on Wednesday. Do you know how much drop your running front rear? And does it bottom out on those soft settings?
They have a blue trim near the edge, yes. I'm not sure of my height settings but it does not bottom out any longer and no rubbing either. I only have rear rolled and replaced front fender bolt on inside with a smoother bolt head.
Reply
Old Jan 18, 2017 | 07:59 AM
  #40  
mindcrime's Avatar
mindcrime
Thread Starter
Lead Lap
iTrader: (2)
 
Joined: Sep 2014
Posts: 556
Likes: 7
From: ca
Default

thanks for the replies everyone. I have Vorsteiner Wheels, not sure of the sizes or offsets as I bought the car with then and I didn't see any wheels specs inside the wheels, but i'll check again today. taking the car to get the coils readjusted and lowering the front to the next setting, then going to get an alignment at 714 tires in Westminster(OC) and have them rebalance the front tires, although I had a repair on the front passenger at America's tire last month for free, so I'm sure they are both balanced correctly, but I"ll just pay to rebalance them before the alignment.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Koz1614
IS - 3rd Gen (2014-present)
22
Apr 11, 2019 08:10 AM
rschaer
IS - 2nd Gen (2006-2013)
7
Aug 23, 2014 09:43 AM
roheel
IS F (2008-2014)
7
Dec 2, 2013 11:44 AM
ISF8530
IS F (2008-2014)
11
Oct 25, 2012 05:14 PM
panda327
IS - 2nd Gen (2006-2013)
10
Jul 2, 2010 03:36 PM




All times are GMT -7. The time now is 11:10 PM.