What have you done to your IS500 today?
10-01-23, 06:53 PM
#286
Originally Posted by TurkishRambo
Do you guys ever have clearance issues/close calls with the swift lowering springs? Thinking of getting a set but really don’t want to feel anxious about scraping
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10-01-23, 06:58 PM
#288
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HighRevs (10-02-23)
10-02-23, 11:25 AM
#292
I don't mind it because I expected it from experience. I think the GSF/RCF stock ones are around 60-70 durometer iirc and figs has an 80 durometer if you want.
I'm not sure what the rating on the RR racing is.
10-02-23, 11:38 AM
#293
the RR Racing road & track bushing is rated at 90d and the street bushing is rated at 85d w/ thrust washers respectively. the GSF/RCF are 54d and oem is listed at 46d. i have the RR Racing street ver and i have no issues with it. steering is a lot better and responsive. the thrust washer is what's supposed to prevent premature inner tire wear; that is the difference from the oem and figs bushings. i changed out my front tires not to long ago but will monitor if the inner tire wear issue is helped w/ this install.
10-02-23, 12:21 PM
#294
the RR Racing road & track bushing is rated at 90d and the street bushing is rated at 85d w/ thrust washers respectively. the GSF/RCF are 54d and oem is listed at 46d. i have the RR Racing street ver and i have no issues with it. steering is a lot better and responsive. the thrust washer is what's supposed to prevent premature inner tire wear; that is the difference from the oem and figs bushings. i changed out my front tires not to long ago but will monitor if the inner tire wear issue is helped w/ this install.
My front tires were worn out on the outside AND extreme inside. The alignment guy said that the wheels were toe’d in and that accounted for the outside wear, but he was stumped on why the inside was gone as well. I researched and found out about the LCA so when I got new tires I aligned them to 0 toe and bought what was available asap. I really didn’t know about the thrust washer.
if I eat the inside of these tires I’ll get the RR racing
10-02-23, 01:19 PM
#295
after doing research, it's THE reason i went with RR Racing. there's a lot of ppl that fear NVH when upgrading the lca bushings, but i really don't feel or see any of those issues...ironic that some of the ppl that fear NVH don't care when it comes to lowering their cars and i know there's some sort of NVH combo when doing that....haha
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10-02-23, 05:09 PM
#298
no rubbing and I do feel less sway, but I touch my front bumper lightly leaving my complex almost every time.
10-03-23, 07:45 AM
#300
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Hmmm… didn’t know that it was the thrust washer that prevented the inner tire wear, I thought it was the hardness of the bushings not allowing the control arm to move around 🤷🏽♂️
My front tires were worn out on the outside AND extreme inside. The alignment guy said that the wheels were toe’d in and that accounted for the outside wear, but he was stumped on why the inside was gone as well. I researched and found out about the LCA so when I got new tires I aligned them to 0 toe and bought what was available asap. I really didn’t know about the thrust washer.
if I eat the inside of these tires I’ll get the RR racing
My front tires were worn out on the outside AND extreme inside. The alignment guy said that the wheels were toe’d in and that accounted for the outside wear, but he was stumped on why the inside was gone as well. I researched and found out about the LCA so when I got new tires I aligned them to 0 toe and bought what was available asap. I really didn’t know about the thrust washer.
if I eat the inside of these tires I’ll get the RR racing
There are 2 things that happen. In the stock control arm bushing the control arm moves about in 2 ways. Laterally ( side to side) and also when you are applying brakes at speed it moves axially (In and out).
- The RCF/GSF bushings increase rubber durometer from 46 to 54. It may help the lateral movement marginally.
- The Figgs bushings increase the oem rubber durometer from 46 or 54 up to 80-90. This will prevent lateral movement.
- The RR Racing bushings will increase the rubber from 46 or 54 up to 85-90 which will prevent lateral movement. The RR Racing bushings will also incorporate the thrust washer that preloads the bushing against the control arm and prevents axial movement.
When you have axial movement happening during braking, the front wheels can do all sorts of things like wander and toe in. This is considered "dynamic changes in toe." This problem is a major factor in inner tire wear. Preventing axial movement plus the lateral movement is the best way to resolve the tire wear for good.
hope this helps
-Justin
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