Thread: Coil overs
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10-21-2010 12:26 PM #1
Coil overs
I have coil overs on my '31 and am curious as to what happens to load capacity when they are adjusted. Since there are several past and present racers here thought I would ask.
OK - the rear coil overs are TCI's All American and with each, I believe, 200# springs (but don't hold me to that figure - I need to try to find the color code). There is approximately 3" of adjustment - with them currently set +/- an inch from the bottom. Now say that I want to increase rear end height/rebound, I'll move them up some amount. Since I believe that the springs are variable rate, what does that do for their compressibility? Does it in fact change those 200# springs to say, 225#? Why do I need variable rate springs? Or don't I need them? These are a bit soggy where they are with the almost full '32 gas tank? Should I just invest in some -- say 250# springs rather then fool around with 'squeezing' these? If I buy different rate springs, who should I buy them from - TCI is way too slow shipping and these appear to be "standard" 3x10 inch race car type springs. Speedway has chrome ()AFCO's from 115 to 600 lbs for about $45 eaDave W
I am now gone from this forum for now - finally have pulled the plug
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10-21-2010 03:04 PM #2
If they are progressive rate springs, my experience with compressing them is that you will lose some of the soft side of the progressive rate and get into the more firm part a bit earlier in the suspension travel. 200 lbs. should be real close on the rate, think I would try cranking in about 3/8" of compression on each before I spent money on a heavier spring.Yesterday is history, tomorrow is a mystery, Live for Today!
Carroll Shelby
Learning must be difficult for those who already know it all!!!!
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10-21-2010 03:46 PM #3
If you have adjustable valving try adjusting your compression. Slowing the the shock down can make a big difference.
Ken
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10-21-2010 05:43 PM #4
Dave S and Ken - I'm going to crawl under the car again tomorrow to do both of what you suggest.
First of all, I'm going to try to find out by TCI color code what I really have. There has been some confusion as when I was putting the car together, they asked me to return the fronts - someone put some that were way too soft in my shipment - surprise, they actually checked. Then I'll make my spring and shock valving adjustment. There will be some difference as I raised the rear of the car by using the highest bolt hole. Even with the tall tires, that '32 gas tank was a wee bit lower then I wanted.
Here's a pretty good article by AFCO and more about springs then I ever needed to know:eek. I haven't read the entire write up yet, but will before I get down and dirty tomorrow (the floor, not the car is covered with leaves and dust - forgot to close the door yesterday and it was windy)
http://www.afcoracing.com/tech_pages...g.shtml#stressDave W
I am now gone from this forum for now - finally have pulled the plug
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10-23-2010 12:07 PM #5
Dave, not to hijack your thread, but I have Viper Coilovers from Pete & Jakes. The adjusting knob on the top has four "clicks". I'm assuming that fully counter-clockwise is the softest, and the damping gets progressively tighter as you tighten the adjusting valve. Is that correct?Roger
Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.
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10-23-2010 12:56 PM #6
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10-23-2010 01:29 PM #7
Roger
Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.
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10-22-2010 05:32 AM #8
It may help you to measure how much the spring is compressed at ride height now, before adjusting them any further. Just a thought. I have these same 200# progressive coilovers, but don't have the car finished yet. Keep us posted.
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10-22-2010 05:43 AM #9
Dave W
I am now gone from this forum for now - finally have pulled the plug
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01-30-2011 03:06 PM #10
Photobucket not working for me either.
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01-30-2011 03:32 PM #11
A bit of an update. I just spent a couple hours looking for 11" springs. TCI has them - that's it. No one else uses this length. 8, 10, 12 and 14 inches are the standard.
So - another Speedway order for some 10" springs along with some Genesis 1" spacers from Hoerr Racing. As long as I have had these parts/TCI chassis, not a bit of recourse for the extra bucks I've spent. Too bad I wasn't as "smart" as I am today. If I had a lathe, the spacers would already have been made.
Luckily Speedway has some 190 pound at garage sale cost, which with the correction factor are only 6-8 pounds over what is needed.
Dam' this is fun!!!!!Dave W
I am now gone from this forum for now - finally have pulled the plug
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02-02-2011 12:41 PM #12
OOPS - they only had one 190# so I ordered some Carrara/QA1. They showed up this afternoon and are on their way back to Speedway tomorrow - one has a 1/2 list and both have lousy chrome plating with black/bare spots. Ordered a pair of AFCO's 200# which will work, tho a wee bit heavier then I need and they might need a shim with my spacers (which are almost too pretty to hide)Dave W
I am now gone from this forum for now - finally have pulled the plug
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02-02-2011 05:19 PM #13
well i hope you have better luck with QA1 then i did i have a set of coil overs in the front of my gto what a joke .spring rate was way off they would not sell me just springs .but a nother front end coil over kit$$$ . i have a lathe made to pucks out of 7075 t6 till i pick up some new spings from summit that would just sell me just springs .... great guys there to help me out .i can say the guy that work for QA1 turn me off i will never buy any thing they make againIrish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip
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02-02-2011 05:54 PM #14
Pat - the visual quality on those QA1 springs was so bad I can't believe they can stay in business. When I talked to customer service at Speedway, you could almost hear "Dummy" being whispered as I explained the problem. The chrome - yeah, how can you chrome only the outer side in a chrome vat. One stands up nice and straight - the other - lists about a half inch regardless of which end you stand it on plus is .25 shorter. AND, they actually felt flimsy - makes me wonder if they really were 185# springs. AFCO replacements will be here on Monday.
I got somewhat educated on coil over springs - you have for coil overs only about 4 standard lengths foe 2-1/2 or 2-5/8 - 8, 10, 12 and 14 inch with rates from less then 100 to over 1000 lb in. Then there is a fairly simple formula to determine what you have based generally on wire diameter and free coils. If any one is interested, I'll dig it up and post.Dave W
I am now gone from this forum for now - finally have pulled the plug
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02-02-2011 06:19 PM #15
I have probably 30 springs from when I was working on my pro stocker-----none are what they are supposed to be
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