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post #1 of 3 (permalink) Old 02-20-2010, 03:38 PM Thread Starter
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Benefit of Aluminum LCA's

I believe my rear LCA bushings are shot, as my rear suspension seems to have major deflection under torque. Unfortunately for my wallet, I read about the new Delrin bushings being made for the rear suspension on my car, and I am sold on them. They sound like exactly what I have been looking for.

I know you have to pay to play when it comes to mods, and cars in general. My problem, is that I am an all-out kind of guy; I do everything I can "while I am there" - and so not only do I plan to get the delrin LCA's, I am wondering if I should go a step further and get the aluminum mark VIII LCA's as opposed to stock thunderbird control arms.

My question is, how could saving 6lbs per control arm effect the rear suspension, other than lowering overall vehicle weight by such a miniscule amount? Would it effect launches at all? Overall, is there actually any real-world benefit to having a lighter lower rear control arm, to justify additional cost ($125)?

Thanks for any feedback.

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post #2 of 3 (permalink) Old 02-20-2010, 04:43 PM
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its unsprung weight which makes more of a difference than sprung weight. Its like putting on lighter wheels or brakes instead of just losing some weight in the trunk. It should help handling technically. Its more like 9 lbs per side. I think its part of a good overall package if you add the aluminum pumpkin and aluminum driveshaft. If you add those 3 mods together you lose a good bit of weight of the a$$ of the car without any compromises.

Someone mentioned that you multiply unsprung by 3 times and its the same as sprung weight.

Spinning pies like wheels.

DD driving my 20 year old project

Now with new ball joints...again
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post #3 of 3 (permalink) Old 02-20-2010, 05:44 PM
DLF
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Splattered covered it well, except for the weight. The difference is just a bit over 7 lbs. per side (~6 lbs. if you use my light-weight UHMW spring perches, and less than 4 lbs. per side if you use aluminum perches).

However, the price difference is more like $275 when you add in the spring perches that you'll need. I sell a bolt-on package which includes the Mark VIII LCA's with the Delrin Bushings installed, the required Mark VIII Torx bolts (make SURE that you get these), and short UHMW spring perches HERE.

However, to do it right, particularily if you're looking for an improvement in launch times, you also need to change the knuckle bushings to Delrin. You can either buy the Delrin Bushing kit and install it in your knuckles HERE, or buy rebuilt knuckles with the Delrin Bushings installed HERE.

Let me know if you have any more questions.

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Last edited by DLF; 02-20-2010 at 08:49 PM.
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