Lower Control Arm Bushings
#1
Driver
Thread Starter
Lower Control Arm Bushings
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.
Thanks
Thanks
The following 2 users liked this post by MikeFig82:
2013FSport (03-27-18),
Frisco (03-12-18)
#5
Keeping it Real
iTrader: (1)
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.
Jeff
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.
Jeff
The following users liked this post:
Frisco (03-12-18)
#7
Lexus Test Driver
iTrader: (2)
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.
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#8
Lead Lap
iTrader: (13)
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.
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.
#9
Lexus Test Driver
iTrader: (2)
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.
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.
Last edited by 2013FSport; 03-27-18 at 06:29 PM.
#10
Keeping it Real
iTrader: (1)
For what it's worth, 20' of caster is 0.33°.
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.
Jeff
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.
Jeff
Last edited by Jeff Lange; 03-27-18 at 06:56 PM.
#11
Keeping it Real
iTrader: (1)
From looking at various sources, these are the dot colours I have come up with so far:
IS F:
48075-30020 - RH, Orange Dot, 0 Offset
48076-30020 - LH, Green Dot, 0 Offset
2006-Early 2011 IS250/350 (Change up to the 2011-2013 part numbers):
48075-53010 - RH, Yellow Dot, 0 Offset
48076-53010 - LH, Purple Dot, 0 Offset
2011-2013 IS250/350:
48075-30030 - RH, ? Dot, 0 Offset
48076-30030 - LH, ? Dot, 0 Offset
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.
Jeff
IS F:
48075-30020 - RH, Orange Dot, 0 Offset
48076-30020 - LH, Green Dot, 0 Offset
2006-Early 2011 IS250/350 (Change up to the 2011-2013 part numbers):
48075-53010 - RH, Yellow Dot, 0 Offset
48076-53010 - LH, Purple Dot, 0 Offset
2011-2013 IS250/350:
48075-30030 - RH, ? Dot, 0 Offset
48076-30030 - LH, ? Dot, 0 Offset
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.
Jeff
Last edited by Jeff Lange; 03-27-18 at 07:09 PM.
#13
Driver School Candidate
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.
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