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Does the GSF/RCF Lower control arm bushings fit?

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Old 08-31-18, 06:46 PM
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henrymc8
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Default Does the GSF/RCF Lower control arm bushings fit?
I saw it fit in the 2Gen IS/ISF threads and it helped the inner tire wear. I just got new tires and would like to install these before the alignment. Does it fit our 3Gen IS?

These are GSF/RCF specific bushings, higher durometer (hardness) than IS250/350.

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Old 08-31-18, 08:40 PM
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E46CT
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I see no reason why it wouldn't fit. Unibody between RC350 and RC-F should be the same, and if the 3IS uses the same bushing as an RC350, then theoretically an RC-F bushing should fit a 3IS. I would buy them and simply return them if they don't fit.
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Old 09-01-18, 12:16 AM
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Jeff Lange
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They will fit.

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Old 09-01-18, 09:02 AM
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ZISF
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Im trying to get a group buy for the bushing. If you're interested chime in on my thread so we can get a head count.
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Old 09-01-18, 01:38 PM
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Hey,

We can do the lower control arm for a great price. the SPC one..

Contact us for pricing!

-Josh
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Old 11-19-18, 06:47 AM
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TonyN
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Anything come about this? I’m looking at doing this to prevent tire wear
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Old 11-19-18, 07:57 AM
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Originally Posted by TonyN
Anything come about this? I’m looking at doing this to prevent tire wear
A few of us installed the GS-F/RC-F bushings but it’s too early to tell if they are helping inner tire wear.
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Old 11-19-18, 12:21 PM
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Originally Posted by Flash5

A few of us installed the GS-F/RC-F bushings but it’s too early to tell if they are helping inner tire wear.
Flash, did you have the alignment checked after the swap?

I have the bushings coming in from Japan...looking forward to being a bit more sure-footed.
Reducing inner tire wear would be nice too.






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Old 11-19-18, 01:33 PM
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TOPENDMS
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I have the GSF bushings installed. 100% bolt-on replacement. The version with negative 0.30 caster correction also got my caster back into factory spec after lowering. Handling is noticeably improved. Also get the exact Lexus factory manual toe specs, don't go by the alignment rack recommendations, they're a little off.
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Old 11-19-18, 10:31 PM
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TonyN
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Originally Posted by TOPENDMS
I have the GSF bushings installed. 100% bolt-on replacement. The version with negative 0.30 caster correction also got my caster back into factory spec after lowering. Handling is noticeably improved. Also get the exact Lexus factory manual toe specs, don't go by the alignment rack recommendations, they're a little off.
how low are you that you threw off the caster
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Old 11-20-18, 12:56 AM
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Originally Posted by TonyN
how low are you that you threw off the caster
Not sure exactly, not too low. One finger gap in front?

Increased caster isn't necessarily an issue, it increases straight stability. (The RRRacing bushing increases caster)

Lowering brought it into the alignment racks 'red zone' (too much caster), and the negative bushing brought it back into factory specs (green zone)..
Last edited by TOPENDMS; 11-20-18 at 01:02 AM.
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Old 11-20-18, 08:44 AM
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Originally Posted by TOPENDMS
Not sure exactly, not too low. One finger gap in front?

Increased caster isn't necessarily an issue, it increases straight stability. (The RRRacing bushing increases caster)

Lowering brought it into the alignment racks 'red zone' (too much caster), and the negative bushing brought it back into factory specs (green zone)..

thank you, I’m looking at lower the car .8 in the rear and 1.4 in the front. I’m going to try the O offsetting bushing
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Old 11-20-18, 09:48 AM
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I bought figs 90 about a month ago, no complaints. Worth the 360$ for peace of mind. Took me less than 30 mins to install.

new rims and tires so I’m looking out if inner tire wear is still present in a few thousand miles.

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Old 11-20-18, 10:11 AM
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Originally Posted by MacroZed
Flash, did you have the alignment checked after the swap?

I have the bushings coming in from Japan...looking forward to being a bit more sure-footed.
Reducing inner tire wear would be nice too.
I recently did an alignment only because I got new tires (switched to A/S tires from Summer’s) everything was fine.
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Old 12-03-18, 08:30 AM
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I just got my RCF LCAB and brackets. It took like an hour to put them on, and boy does this small mod make a huge difference in driving!

The car is so much more stable at highway speeds, and much better behaved while braking. I do not notice any NVH at all.
I can't believe that Lexus didn't put these bushings in from the get-go.

This is a great way to spend $80. Recommended.


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