After springs and spacers 15/20mm
 

After springs and spacers 15/20mm
https://cimg6.ibsrv.net/gimg/www.clu...12aafb51d.jpeg

Hi, that looks SICK!!! :thumbup:. The springs and spacer from were?
Thanks

Very nice! Is the ride quality affected?

:confused: RSR IS350 downs have a spring rate of 5.48 kg/mm Front and 8.16kg/mm Rear. By comparison RC F and GS F spring rates are 8.67 Front and 14.4 Rear and even that's supposed to be too soft according to many.

@macmaster what are is500 rates? Are the springs not progressive?

These RSR downs are definitely stiffer than stock but I like the sportier handling.

It rides like I wish it did in sport +, definitely tighter/stiffer than stock….like 15-25%?

No idea what the stock rates are. Your RSRs are progressive. I was just implying that if you want the same handling and weight transfer as RC F the higher spring rate like the RC F is probably better.

Egads…stiffer than in Sport+? Oof, hard pass. 😜

We have a mint 2004 G35 coup (100k miles) in the stable too and I can’t stand the ride. It handles like a beast, but even with good tires the road feel is too much for me.

I would love to lower mine like yours, the look is freaking bada$$, but the smoothness must remain.

When it comes to lowering the IS500, smoothness is also a concern for me, along with long term damage on the car. However there's no denying the handling improvement due to the lower center of gravity. When I change lanes at high speeds I can feel the sway on the IS500. Lowering is by far most noticeable handling upgrade you can make, not buying PS4S tires.

^^ Changing the LCA bushings may help provide a more crisp handling response. The IS 500 uses the same LCA bushings as the IS 350, and I have installed the one from the GS F and has improved it a bit. The more drastic improvements would be going with FIGs or RR Racing but some say that these can introduce more NVH - I wanted to keep mine as close to OEM riding quality. There is no question that lowering the car will make it handle even better

I think you made a good call on the GS F LCA bushings, but I personally haven't decided what to do about those. Part of me is waiting to see how bad the inner tire wear actually is on my first/stock set of tires. I also see GS F/RC F guys going to Figs which makes me think "why not just skip the GS F bushings altogether and go to Figs too" but then some people do report NVH, needing to grease the poly bushings, and report only a noticeable improvement when taking corners really hard. So the more I dig, the less appealing Figs/RR seems. Again, good choice.

Yeah, the GS F LCA are a good compromise and maintaining the Lexus ride signature. It is not perfect but a step in the right direction and for 200 to 300 dollars including installation is not a deal breaker.

what did that run you, if you don’t mind me asking?

^^ Well, I tried ordering through Megazip but ran into an issue when they tried to verify my CC so I just got flustered and canceled the order and got them from the dealer since they would install them anyway. I paid about 100$ (Canadian) per unit but much cheaper via megazip (Thanks to Sasnuke for the tip) and then 1 hour of installation labor. The Lexus dealer hourly rate was about 20$ more than the Toyota dealer that installed them on my 2021 IS but overall, it was still cheap. You should be able to get these done for between 200-300$ all in especially in the US and if you order online, would be closer to the 200$ mark. They checked the alignment after but because it was so minor, they never charged me because I had ordered rims and other parts from them. Hope this helps.

helps a lot! Thanks 😊