Spring unseating at droop
#1
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Spring unseating at droop
Rear springs unseat at full droop with a full 1.5" of play. Before I spend my limited Challenge budget to fix this, is it a problem? My concerns are:
1. Unsettling the car upon compression if the suspension is unloaded to the point to unseat the spring
2. Potential damage to the coilover sleeve, top hat, or spring perch.
I looked at tender springs, but they're expensive on my challenge budget, particularly the coupler ring prices are out of control.
I haven't installed the front springs yet, as I didn't want to install to possibly immediately remove and disassemble them.
1. Unsettling the car upon compression if the suspension is unloaded to the point to unseat the spring
2. Potential damage to the coilover sleeve, top hat, or spring perch.
I looked at tender springs, but they're expensive on my challenge budget, particularly the coupler ring prices are out of control.
I haven't installed the front springs yet, as I didn't want to install to possibly immediately remove and disassemble them.
#2
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http://forum.miata.net/vb/showpost.p...6&postcount=21
Warning: no personal expereince, and I am also interested in this topic.
I think generally its acceptable, but it still scares me.
Warning: no personal expereince, and I am also interested in this topic.
I think generally its acceptable, but it still scares me.
#4
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I approve of your supplier. I knew Jeff when he was first starting up. Spent a lot of time at his shop
Me when I was 16:
http://www.240sxmotoring.com/dacls13bl.html
/ threadjack
Me when I was 16:
http://www.240sxmotoring.com/dacls13bl.html
/ threadjack
#5
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My springs do this on my track car and soon on my daily. The shock is "damp" so it will never, ever extend unless you jack the car up for a long time. When you're driving you have the force of the shock that will almost always hold the spring on the perch and the sway bar to do the same.
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There is no doubt there--the spring is completely free floating at full droop with 1.5" of clearance. That means that there is no spring pressing tire into pavement at droop, and there is nothing keeping the spring aligned until after initial compression after droop.
The data I've been harvesting seems to point in the direction of that it's a workable solution, but adding a tender spring would be more ideal.
Maybe I can find a cheap enough lathe to cost justify buying the lathe and material vs purchasing off the shelf retainers. I don't see why they're so expensive.
The data I've been harvesting seems to point in the direction of that it's a workable solution, but adding a tender spring would be more ideal.
Maybe I can find a cheap enough lathe to cost justify buying the lathe and material vs purchasing off the shelf retainers. I don't see why they're so expensive.
#12
The zero rate helpers wont do anything for performance. Helpers with some rate to them might help a little for traction when bouncing of FIA curbing and stuff like that. It takes some spring force to actually overcome the damping, swaybar, and friction forces to actually push the tire back in contact with the ground when the inside tire becomes airborn.
Bob
Last edited by bbundy; 01-25-2012 at 05:44 PM.
#15
i work on a second gen rx7 gt4 race car that runs bilstiens and has this same condition and in the past 7 years of traking the car it has not had an issue with the springs coming unseated while driving.
http://www.abrracing.com/
http://www.abrracing.com/
#16
No worries, I have the same thing its about an 1.5" of droop, maybe a tad more. No problems whatso ever on track. This is with both sides jacked up, so both have to be at full droop for it to even be a consideration. Once you weight the other side down, the sway bar should do the rest.
If you suspect otherwise, you can move to a stiffer sway and/or shorter endlinks. But then you have to be careful, because if you have enough grip you may lift one of the rear tires.
If you suspect otherwise, you can move to a stiffer sway and/or shorter endlinks. But then you have to be careful, because if you have enough grip you may lift one of the rear tires.
#17
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This is my Challenge suspension package, so budget is very sensitive. I would like to fab new sways and links, if I can fit them into my time and budget constraints.
Tires will be 205-50-15 Hoosier SM on stock wheels. Should be a decent amount of grip, considering the narrow wheels. I haz Torsen in this car, so lifting a wheel is failboat.
#18
doesn't sound like you will lift (I think you have to run a really stiff rear bar, maybe a FM on full stiff or something). I have the 949 endlinks, and 5.25" ride height on track. On full droop, if I forcefuly push on the tire, I may just be able to move the spring by hitting it.
I seriously don't think you will have any troubles if you are running a comparable set of swaybars to your springs. I am on the stock endlinks+sway bar in the rear (99 NB, 11mm), and I haven't had problems. I will say I still run street tires, 205/50 star specs and soon to be AD08s.
then with 205 hoosiers, I don't think you will have problems. Since you are on a budget, I would try it out first before worrying too much. I also don't run spring locators, so I would be more likely to have trouble anyway.
I seriously don't think you will have any troubles if you are running a comparable set of swaybars to your springs. I am on the stock endlinks+sway bar in the rear (99 NB, 11mm), and I haven't had problems. I will say I still run street tires, 205/50 star specs and soon to be AD08s.
then with 205 hoosiers, I don't think you will have problems. Since you are on a budget, I would try it out first before worrying too much. I also don't run spring locators, so I would be more likely to have trouble anyway.
#20
http://www.carbibles.com/suspension_bible_pg5.html
Video rear shock under car. Miata running autocross no rear swaybar. I don't know anything else about the setup.
Video rear shock under car. Miata running autocross no rear swaybar. I don't know anything else about the setup.