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I am going to order some of the IS-F lower control arm bushing. There arm 3 different ones(0 and +-20). Has anyone installed the +20's to increase straight line stability? Or is best to leave it alone with 0.
I am going to order some of the IS-F lower control arm bushing. There arm 3 different ones(0 and +-20). Has anyone installed the +20's to increase straight line stability? Or is best to leave it alone with 0.
Part No.48075-53020Part DescriptionBRACKET SUB-ASSY, LWR ARM, NO,1
OFFSET:+20,REFER R/M
Go to myLParts.com. In the description it gives you options. Example one says puple, blue, orange DOT. On your OEM LCAB check your colors for L/R. Dots are different colors on both.
I had considered whether or not to order the +20' caster versions when I replaced mine with the RC F bushings, but ultimately decided to stick with the 0. To be honest, 20' isn't a huge change in caster angle.
That said, it won't hurt to go to the increased caster version. I've seen some in Japan that are probably at least 1°30' or more, but they used an actual offset bushing to get the caster change.
Go to myLParts.com. In the description it gives you options. Example one says puple, blue, orange DOT. On your OEM LCAB check your colors for L/R. Dots are different colors on both.
Here's my stock colors.
Mike, if you get bored, see if you can measure from the bolt holes to the center of the bushings. It may help determine if your OEM's have an offset and/or which direction.
I'm not sure which of mine 350 of ISF had dots, maybe both? I'll take look tonight and see if its measurable. If you think moving the core of that bushing a small amount and what it does to the lower ball joint and spindle to change the caster 0.2°, it may offer some perspective.
That said most measurement systems in use do not yield that level of repeatability when talking 8.X° of caster. Just look at the As Found As Left alignment printouts on our non-adjustable cars and you see that. Camber values too. Mostly tech errors vs equipment I suspect.
Mike, if you get bored, see if you can measure from the bolt holes to the center of the bushings. It may help determine if your OEM's have an offset and/or which direction.
I'm not sure which of mine 350 of ISF had dots, maybe both? I'll take look tonight and see if its measurable. If you think moving the core of that bushing a small amount and what it does to the lower ball joint and spindle to change the caster 0.2°, it may offer some perspective.
That said most measurement systems in use do not yield that level of repeatability when talking 8.X° of caster. Just look at the As Found As Left alignment printouts on our non-adjustable cars and you see that. Camber values too. Mostly tech errors vs equipment I suspect.
Well I was bored. The bushing measure exactly the same in every way. I have an orange dot on one, and a green on the other. As for which side I pulled them off my car. Honestly I can't remember. The orange making is listed as +/-0 offset. The green one is not listed for some reason. See pics below they over lap perfectly. Even getting the same readings with caliper center of bushing to slotted mounting holes.
Well now... My OEM 350 parts from 2013 have the blue dot on the left side. No dot right side.
Diagonally across from blue dot is -K-05. The same is on the right. Adding to that both have a laser etched N on them. And to your point there is no obvious discernable offset when measuring with veneer calipers or matching the holes.
Could the N equate to Neutral or no offset? That said, 0.2° of caster compared to 8 is nothing. A 0.75 variance could go unnoticed by most. Driven by curiosity.
Note looking at backside, radius goes forward and the small hole inbound.
That said, the dots are likely used to indicate not only the caster difference but also the side as well as the bushing type. I've never seen any reference to the dot colour myself when I've looked, even on MyLParts, they only list the +/- or 0 offset. If they did list the colours somewhere, it would be easy to know which ones were suppose to be which. Where did you see those Mike?
You are right though, 0.33° is not something you would typically feel or notice; especially given how much caster angle the cars have.
Curiosity is always good though, interested to know if there is a good way to identify what's on the car for sure.
Perhaps the blue dot/no dot are the 2011-13 0 offset or some other +/- offset?
Doing some searching on MyLParts.com with the part numbers, I can find the dot colours, some have 2 colours listed (black and blue dot for example), however a few of the colours I found don't actually match what I've seen on them myself, so now I don't know how accurate their listings for the colours are. I had a whole post done up using their colours and when they started not matching what I had seen I ditched it. Odd.
Well I was bored. The bushing measure exactly the same in every way. I have an orange dot on one, and a green on the other. As for which side I pulled them off my car. Honestly I can't remember. The orange making is listed as +/-0 offset. The green one is not listed for some reason. See pics below they over lap perfectly. Even getting the same readings with caliper center of bushing to slotted mounting holes.
did you ever figure out if both your bushings were "0" caster? I have the same color dots you have.
03-12-18, 11:30 AM
Lower Control Arm Bushings
