newgsman

iTrader: (4)

Aren't your struts still under warranty. Don't they fall under the six year drivetrain warranty?

lobuxracer

iTrader: (2)

If you have struts on your car, you have bigger issues than simple calibrations. No IS has struts. Never have, doubt they ever will, but I will say the RCF and GSF got a really butchered rear suspension configuration. Like a 50's Chevrolet.

ultimase

I think it's a powertrain warranty covering the engine and transmission. Not sure suspension is included.

redspencer

iTrader: (1)

Interesting...would you mind elaborating on how the revised multi-link rear suspension of the RC-F and GS-F differs from the IS-F and how the new design may be less desirable than what's used on the IS-F (if I'm interpreting your post correctly)?

lobuxracer

iTrader: (2)

They no longer have a coilover configuration. The spring and the shock are separated with the springs inboard and the shocks outboard. I have no idea why they decided to do this unless it was to maximize trunk space. These two pictures should be enough to see it:

4TehNguyen

iTrader: (1)

it does helps maximize trunk space and whole suspension is a lot more compact. It was stupid easy to change them on the GT which has a similar setup, although it bolts on the outside of the vehicle instead of inside. When I changed shocks on the 06IS had to dismantle the entire trunk trim to get to the strut mount bolts. Trunk is more open and wider on the 14IS. Then on the GT, I could remove the shock with 4 bolts, no compressor tool needed. Could do both shocks in 20 minutes. Did my entire rear suspension in under an hour.

A drawback is with this type of setup where the spring is more inboard, the spring rate is very high compared to the front since you need more spring force to gain the same leverage as a lower spring rate that is more outboard. But probably doesnt matter much since you didnt need a compressor anyways.

lobuxracer

iTrader: (2)

The other drawback is there are no standard springs available for this setup. Lowering (or raising) is a challenge unto itself, and the calculations for spring and shock settings are significantly more complex because the motion ratios for each are unique. This setup would never be my first choice.

avgj0F

iTrader: (2)

After 8 years and 72K miles, gave my car a gift and upgraded the worn out leaky shocks with a complete new set of 2011 shocks, springs, and rear bumper stops. I took it out during the rain last night and after 50 miles of all types of road conditions, it felt like a new car again, but with a much better ride compliant. Significantly less road noises and while I have the USRS installed last year, the new suspension virtually ironed out all the harshness and bumpy rebound that old set up has.

The car is now totally transformed. Thumb up to the OP and a few enthusiasts for the write up.

2008ISF

iTrader: (1)

Has anyone looked into whether or not 2014 shocks/springs/mounts would work on 2008?

Its time for some overhaul maintenance on my car and was wondering if anyone had upgraded their suspension on a 2008 to the latest iteration of the 2014? Did you run into any problems? Fitment issues?

I would love to go aftermarket...but my driveway is really, really steep. I can just barely make it into my garage with rear diffuser...going in backwards. So unfortunately, aftermarket is out of the question since it would most likely lower my car...which is undesired.

k20trick

iTrader: (3)

The 2012+ Sachs suspension should all fit

ackshen

Been a long time since anyone posted on this thread, but it was super helpful for me in searching for parts to upgrade my '08 to '13 spec. If anyone is looking and/or has been considering doing the same, Lexus of Mobile has all the parts for 25% off right now, and pretty cheap shipping (also no sales tax? not sure why). I've had my '08 for all of about a month now and with our rough roads in CO I figured this was the best investment I could make wanting to keep the car 'factory'.

zebani

iTrader: (5)

That's a good deal for sure. Though I sold mine years ago I remember the difference the later year shocks/springs made. Congrats

ackshen

Parts finally arrived for the '08 to '13 swap. Noticed an unexpected part in the rear shock boxes (90948-01089) assuming that's a direct replacement for the existing strut mount cushion? Also wanted to double check on the comments on the rubber insulator on the spring perch noted above. Assuming if I'm coming from an '08 to the '13 springs, my perch will have the rubber insulator, and I should leave it on during the install? Or pull it and go metal to metal? Not clear on exactly what the setup looks like as the old photobucket image links above don't work anymore. Thanks!

Rkwo999

Has anyone driven a 2013 stock ISF vs an ISF on KW V3’s? I have a 2011 and keep going back and forth between upgrading the suspension to 2013 OEM springs/shocks vs KW V3’s. We have crap roads in Philly so I’m looking for something to smooth out the suspension driving around town as my DD. Zero track days. Thanks!

alnug

Hi, i did exactly this and also the 2013 shocks and springs are a little more compliant. They don't make a big enough difference and in the end i brought tein comfort sports coilovers. I would say go with the KWs