jegs lca
06-12-2010, 04:10 PM
#3
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
Polyurethane bushings are much cheaper to make than the molded rubber bushing used by the auto manufacturers, if done properly (good castings, proper resilience, well machined, etc.) they can provide improved handling and a generally more "tight" suspension--if done improperly they can suck big time...
06-12-2010, 07:19 PM
#4
Retired Moderator
Join Date: Jun 2006
Location: SF Bay Area
Posts: 9,235
My1st... those are a HORRIBLE DESIGN!
Please do NOT put those on your car and ESPECIALLY if you drive it on the street. If it were a STRICTLY 1/4 mile ride, I would have no issue with design, but would guess they will not hold up as others have mentioned.
What are the goals for your ride and why do you want new LCA's?
Jazzer
Please do NOT put those on your car and ESPECIALLY if you drive it on the street. If it were a STRICTLY 1/4 mile ride, I would have no issue with design, but would guess they will not hold up as others have mentioned.
What are the goals for your ride and why do you want new LCA's?
Jazzer
06-12-2010, 07:23 PM
#5
2nd Gear Member
Thread Starter
Join Date: Jun 2008
Location: ohio
Posts: 350
well with you and cliff chiming in ,its safe to say i will not be buying these ,even cheap as i can get them for. i do alot of 1/4 mile run and less and less street time , but thats manly work related. so i figure at some point ill need some lcas and for the price thought id check on those.
06-12-2010, 07:44 PM
#6
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
I have been in trouble lately for putting forth "my opinion" about a number of things, nonetheless my experience with polyurethane bushings has been that they are great for track-only cars, or for weekend cruisers, however for a DD they are more trouble than they are worth.
If they don't squeak/creak/groan they they are disintegrating in 10k to 20k miles. Properly specified, cast, and machined urethane can be great--problem is that a good number of after market urethane bushes are not "properly specified, cast, and machined" and turn to shìt in short order...
If they don't squeak/creak/groan they they are disintegrating in 10k to 20k miles. Properly specified, cast, and machined urethane can be great--problem is that a good number of after market urethane bushes are not "properly specified, cast, and machined" and turn to shìt in short order...
06-12-2010, 08:55 PM
#10
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Join Date: Jun 2006
Location: SF Bay Area
Posts: 9,235
I agree with the Cliffster in his #6 post 
.... but will add the reason I don't like them and consider them a horrible design. With the OEM LCA's, you have a soft rubber bushing at each end and a somewhat flexable arm itself, to allow a reasonable amount of articulation of the rear axle during body roll in a hard corner. With this articulation, the arms need to twist laterally and, along with the soft rubber bushings, do this with some success. With an aftermarket LCA design, such as the one linked, the arm is now solid so it will over no flexability at all. Compound this issue with hard poly, or the like, bushings at both ends, you have an arm that greatly resists ANY articulation of any kind. This leads to damaged torque-boxes and/or damaged bushings so the LCA's don't do a good job in ANY circumstance.
My recommendation would be an aftermarket arm with a spherical end and a poly bushing, or the like, on the other end. This will completely free up the axle in this location to move as it was intended, but not "really" designed. I would recommend one of the two following arms, depending on your needs:
UPR poly/spherical LCA's
MM HD's
Depending on your driving needs, I would say one of these would be best for you. If you are a DD and don't hit the 1/4 mile with stickeys, the UPR's are fine. If you plan on hitting the launch-pad, I say MM's. If you are REALLY 1/4 mile focused and with stickeys... I would say MM XD's due ti stronger design of dual-spherical.
See my Official Supsension Guide for a more in-depth description of such things
Jazzer
.... but will add the reason I don't like them and consider them a horrible design. With the OEM LCA's, you have a soft rubber bushing at each end and a somewhat flexable arm itself, to allow a reasonable amount of articulation of the rear axle during body roll in a hard corner. With this articulation, the arms need to twist laterally and, along with the soft rubber bushings, do this with some success. With an aftermarket LCA design, such as the one linked, the arm is now solid so it will over no flexability at all. Compound this issue with hard poly, or the like, bushings at both ends, you have an arm that greatly resists ANY articulation of any kind. This leads to damaged torque-boxes and/or damaged bushings so the LCA's don't do a good job in ANY circumstance.
My recommendation would be an aftermarket arm with a spherical end and a poly bushing, or the like, on the other end. This will completely free up the axle in this location to move as it was intended, but not "really" designed. I would recommend one of the two following arms, depending on your needs:
UPR poly/spherical LCA's
MM HD's
Depending on your driving needs, I would say one of these would be best for you. If you are a DD and don't hit the 1/4 mile with stickeys, the UPR's are fine. If you plan on hitting the launch-pad, I say MM's. If you are REALLY 1/4 mile focused and with stickeys... I would say MM XD's due ti stronger design of dual-spherical.
See my Official Supsension Guide for a more in-depth description of such things
Jazzer
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