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Old 02-21-2005, 10:04 PM   #1
Zoinks
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Default Specific effects of rear endlinks for street/autox

I've got a set of 22mm f/r Cusco swaybars I'll be installing when I have free time on a nice day. I don't have endlinks, yet, but I'm wondering if it would be worthwhile to pick up a set of Kartboys to throw on as well.

Thing is, I'm still not clear on the effects of hardened rear endlinks, and there's a lot of other things I could do with that $100, so I thought I'd look for some clarification. I've read that endlinks basically increase responsiveness by eliminating the squishing, and thus delay, in the factory units. Going by that, the endlinks shouldn't change the effective rate of the rear bar, right? I'm not sure I'd want them to.

If not, how significant is the change? Is this a minor "feel" issue, or is it going to make a big difference in handling? Will it show up in my run times?

The other modifications to the car are simple - prodrive springs, mild alignment w/ 0 toe, and 17" 225 oldschool Azenis. Would the endlinks contribute to less-than-safe twitchyness? If have a 22mm front bar going on as well, and I'm not a crazy driver on the street, but I'm only human, and not immune to moments of carelessness or inattention.

As it is now, with the stock swaybars, the car does tend to push on corner exits, but I've been pretty happy with the extent to which I can get neutrality/oversteer on entry just with changes to tire pressures/driving style. Will the endlinks contribute - beyond the changes from the bars themselves - to a generally increased tendency to oversteer?

Worth pointing out that I'm a novice. Last year was my first season.
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Old 02-21-2005, 10:48 PM   #2
adhowe70
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The endlinks will change the effective rate of the bar. It will make it stiffer. Follow the logic here:

Say it takes 100lbs of bar force to completely deform the endlinks and the bar rate is 100lbs per inch. Say the endlinks have a total deformation of 0.125 inches. At 100 lbs of bar force, you have 1.125 inches of total deflection. At 200 lbs of bar force you have 2.125 inches of deflection, 300 lbs = 3.125, etc.

New endlinks eliminate the 0.125 inches of total deflection making the new total deflection of the endlinks 0 inches. So, you have 100 lbs = 1 inch, 200 lbs = 2 inches, 300 lbs = 3 inches, etc.

When you look at the bar rates, the soft endlinks make the bar look like a progressive spring. The stiff endlinks make the bar like a linear spring. Both bars have the same linear high deflection rates, but the difference in the low deflection rates makes the softer endlinks result in a softer effective bar rate relative to the zero point.

(Note: The numbers have been changed to protect the innocent)

Andy H.
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Old 02-21-2005, 11:14 PM   #3
MNbiker
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Having done back to back testing with both front/rear stock and aftermarket (Noltec) endlinks, the primary NOTICEABLE change was how quickly the affects of the anti-sway bars were felt. This resulted in sharper initial turn-in and a more precise feel in transitions. The difference wasn't extreme, but was noticeable.

As for stiffer endlinks changing the effective rate of the bars, IMHO the impact is minimal. In steady-state cornering, I couldn't really tell much difference between stock & aftermarket endlinks.

-Steve
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Old 02-22-2005, 01:20 AM   #4
adhowe70
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Steve's got this one right... impact on steady state cornering is minimal. There is an impact, but its small.

At turn in and track out, (1 inch of bar deflection in my example) the effect of the stiffer endlinks is the greatest (about 12% in my example.) As cornering force increases, the percent change in bar rate decreases.

Andy H.
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Old 02-22-2005, 03:53 PM   #5
AUTOwrXER
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Good Whiteline article on the subject here: http://www.whiteline.com.au/articles/WL_Alloy_link.pdf
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Old 02-22-2005, 08:01 PM   #6
adhowe70
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Hmmm... it looks like their poly bushings have the same stiffness as the OEM rubber ones. That must be why I like my hiem rod end endlink setup. No bushings at all.

I'd guess the Whiteline article just proves to me that I'll stick with my custom designed end links. The testing proves that unless you are running race tires, the Whiteline end links are a waste of money. Untile you're close to picking up the inside tire, there is increase in stiffness with their end links.
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Old 02-22-2005, 08:18 PM   #7
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The stock squishy endlinks wont have a negitave affect on your new big ass swaybars persay. It's just that the stiffer ones will help them work better, like they're supposed to.
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