Originally Posted by Rsuave24

Alright, this thread has been dead for awhile. Since this thread was started over a year ago, I wanted to update for those who would consider replacing their stock is350/250 rwd struts with 2008+ Isf struts. About a year ago I started this thread wondering if anyone had tried running ISF oem suspension on an Is350. To my surprise no one had, so I took a shot at it and it has now been over a year since.





So since the mod I've had a chance to to Daily (in all conditions, rain, snow, summer, ICE!, dirt) and have about 7 track days on them on multiple formats including auto x, road course, and winter cross (essentially autocross hpde on a track with snow and ice).

Performance review. (Mind you I have front and rear sway bars also..)
This review isn't just ISF strut/shock independent.



The suspension holds up to any abuse very well, being an Oem setup it acutaully still drives pretty smooth, but it also makes the daily drive alot more spirited knowing that the response you get from a stiffer setup is alot more exhilarating. I commute daily to work and have gone on multiple road trips to Chicago from Minnesota. It IS stiff, and there is some rattle when I hit cracks/bumps in the road but I'm gonna blame that more on the sways, It has never been unbearable (for me anyways). A point that alot of early F drivers stated in the beginning was that the Isf suspension was too stiff, but I don't think at the early stages alot of people were accustomed to the fact that this wasn't your normal, driven on clouds and pillows type of Lexus, this was a Lexus developed and engineered at the track also. Lexus spent alot of time fine tuning the suspension so that it could attempt to be comparable to the Bmw M3.





In terms of track performance, this is where it really shined! Alot of people may have discredited the 08 ISF suspension solely because they had only saw it from a daily driving aspect. After driving it to its potential on the track, you really get a sense of what Lexus was trying to accomplish when it came down to building a car donning the F badge. I in no way claim my is350 is anywear near that, but when you add some true F parts, you do get a slight hint of F performance.





I still have not felt the need to get coilovers..Yet. I have been looking though! I just haven't felt it was necessary yet, I feel I haven't out driven the suspensions potential. I'm still playing with tire setups to optimize the full benefit of this suspension and just finished adding the rest of my go fast bits.. intake, full exhaust (including headers).

I know this is kinda a general update, but for the year I've had this setup the only thing, like most ISF guys experience, is that I wish I had the ability to adjust the front height.. but not a big deal. For the $200 I spent on this suspension, it was WELL worth it. The ability to have an oem upgrade based on interchangeablity is a beautiful thing. I experienced this in the Honda game and it made for a good time knowing that you could upgrade performance with piece of mind that you have oem quality (an OEM upgrade) so to speak. I suggest you make friends with an F guy and reap the benefits of getting these upgrades for cheap. Money saved on parts, buys you more time at the track!

Recent Trackdays

https://youtu.be/upg3FJvMucY

https://youtu.be/N_pindtmiwQ

https://www.instagram.com/p/BFFaNz9DgYJ/

https://www.instagram.com/p/BADtZzJDgR7/

Originally Posted by 2013FSport

F-Sport Suspension components listing

I won't say this is exhaustive or 100% accurate, I just pulled out the obvious suspension bits applied to the 2013 F-Sport 2IS chassis. Many of the hard parts (minus springs and dampers) are on the IS-F. Steering ECU and interior frills are not listed here. I guess if it's good enough for the I-SF, it's good enough for us.
It seems they changed a lot of little things in the rear. I'm guessing to control the camber in the corners?
Snap shot is springs, dampers, sway bars, toe links, A-arm, spindle.

Originally Posted by ELexis

2013 FSport, wow! Thank you for taking the time and posting the attached build sheet / breakdown of 2013 IS 350. Very much appreciate you doing so! To confirm, is the Sport Tune suspension offered with the X and Sport packages prior to 2011 IS 350's, include the same same suspension components as the F-Sport option that began being offered on 2011 IS 350's and up, just re-named, and was EPS steering always part of the F Sport suspension / option, when a vehicle is oreded with F Sport package?