10'' or 12'' coilovers - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 37 Old 12-04-2005, 11:42 PM Thread Starter
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10'' or 12'' coilovers

What is the pros in cons with them?


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post #2 of 37 Old 12-05-2005, 07:58 AM
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Soft 10" will be more likely to bind than soft 12" springs. Otherwise, probably not much, aside from a desire to relocate your lower perch.

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post #3 of 37 Old 12-06-2005, 09:01 PM
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Besides the potential bind issue, there is a little bit less weight in the 10" spring. About a pound per spring.
I run 8" springs, but mine are 500 lb/in. The 8" gets the lower spring perch above the tire for a little more inside tire clearance.

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post #4 of 37 Old 12-07-2005, 03:42 AM Thread Starter
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I have a set of 97 cobra rims and i need to no if thay are going to clear a 12'' spring

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post #5 of 37 Old 12-07-2005, 07:13 AM
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If they're 8" it should be no problem.
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post #6 of 37 Old 12-07-2005, 11:51 AM
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On my '92 GT I had a 12" coil spring with Cobra R wheels and 245's, stock a-arm and k-member, 94-95 spindles. There was too much interference and the wheel wouldn't fit with the long spring.
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post #7 of 37 Old 12-07-2005, 11:39 PM Thread Starter
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Quote:
Originally Posted by richs347
On my '92 GT I had a 12" coil spring with Cobra R wheels and 245's, stock a-arm and k-member, 94-95 spindles. There was too much interference and the wheel wouldn't fit with the long spring.

What spring did you go with.

I think I have to get 10'' I have front spindles from a 97 cobra brakes, hubs and im going to run strange struts with coilovers I thought that 12'' coils. I'm also going to run the 97 cobra wheels and I think thay are 17x8.

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Last edited by srt4; 12-07-2005 at 11:51 PM.
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post #8 of 37 Old 12-08-2005, 05:52 AM
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When I call Griggs they said to use an 8". At the time I was using the 12" and had the stock 5 star rims. I wasn't as happy with the coilovers as I thought I would be and pulled them off when I found the Cobra wheel wouldn't fit. Problems I had: The threads on the collar that fits around the strut was being rubbed out from the larger spring on one area and when raising the car the spring would fall out from its perch. I think the Griggs and Eibach have the system that prevents the spring from dropping out of it's perch when you raise the car. (Using a secondary spring). I was tired of screwing with it any further. I'm now using a standard H&R race spring - with no hassles. I just don't have the time to play with the car like I used to......before wife and child.

EDIT: In addition... I had 400lb coil over front springs with the ride height about the same as with lowering springs - 1.5" lower than stock. Full weight 92 GT with everything - 3600#'s with driver.

Last edited by richs347; 12-08-2005 at 10:55 AM.
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post #9 of 37 Old 12-08-2005, 08:27 AM
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Note that different spring rates will locate the lower perch at different elevations [edit: for a given ride height], so you can't really say whether the perch will interfere with your wheels for 10" or 12" springs. Example, a 500lb 10" spring will compress, say, 1.5" (assume the front of the car weighs 1500lb) putting the compressed length at 8.5". A 300lb 12" spring will compress 2.5", putting the compressed length at 9.5".

So you can see how you need to determine where you need the perch to be to avoid interference, and use that in combination with your spring rate and ride height to determine the appropriate spring length.

Last edited by huesmann; 12-08-2005 at 08:29 AM.
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post #10 of 37 Old 12-08-2005, 12:48 PM
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I had interference with 10" spring, so I went with an 8" 425#.
But these wheels are 6.6"BS with 9-1/2" wide... so VERY different than many people use.



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post #11 of 37 Old 12-09-2005, 12:24 AM Thread Starter
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I gess I need to no if any body has a fox with 97 cobra brake 5 lug cov with coilover with 97 cobra wheels. If so what spring are you running?

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post #12 of 37 Old 12-09-2005, 01:59 AM
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I run 17X9 frpp m179 with 255/40/17 tires and a 12" 275# spring. This is with a gr-40 suspension. I had to elongate the top strut mount hole 1/4" and now have no rubbing.

Sorry ......95 cobra brakes front and back.




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post #13 of 37 Old 12-09-2005, 08:29 AM
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Indy, are those Koni yellows?
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post #14 of 37 Old 12-09-2005, 11:36 AM
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yes SA.

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post #15 of 37 Old 12-09-2005, 12:31 PM
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Or if you wanna cheat use 94 and up tubular front control arms for .75 more spacing or use a wheel spacer.
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post #16 of 37 Old 12-10-2005, 10:48 AM
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Quote:
Originally Posted by indy2000
yes SA.
Was wondering why the lower perch looked different than my (also yellow) Bils' perch.
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post #17 of 37 Old 12-10-2005, 05:57 PM
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ttt

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post #18 of 37 Old 12-10-2005, 06:28 PM
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Quote:
Originally Posted by mesostophiles
Or if you wanna cheat use 94 and up tubular front control arms for .75 more spacing or use a wheel spacer.
I really don't think longer control arms will help the situation of wheel and coil-over clearance. It does nothing to change the relationship of the spindle (which the wheel is mounted to) and strut (which the coil-over it mounted to). It would increase track width, change available camber range, camber curve, and some other smaller details. The wheel spacers would help, but some may not want to use them due to application and clearance.

Just some info, I am using 8" 400# springs. The MM Bilsteins had one of the holes slightly enlarged and I have the spindle pushed in as far as possible (maximizing camber while decreasing coil-over/wheel clearance). I am currently running 17X8 wheels though for street and autoX. I do have enough clearance for 17X9s with 6.12" backspacing ('03/04 Cobra wheels) with the way the struts are mounted on the spindle (pushed in). From looking at it, with 10" springs I would have to change the relationship of the strut and spindle to have the clearance needed or raise the front ride height.

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post #19 of 37 Old 10-17-2006, 09:56 PM
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ttt

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post #20 of 37 Old 10-17-2006, 10:25 PM
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Quote:
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ttt
You are reviving a thread that is almost a year old. This thread has already been discussed. You must have a specific question. If you have a question about this topic, please post your question. Posting "ttt" gives us no information as to what you would like to know other than what has already been discussed.

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post #21 of 37 Old 10-17-2006, 10:37 PM
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in that case... how much thread engagement do you guys get running 8" springs (i have d&d coilovers)?

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post #22 of 37 Old 10-17-2006, 10:44 PM
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Quote:
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in that case... how much thread engagement do you guys get running 8" springs (i have d&d coilovers)?

is that better mr. moderator
Just trying to help you out. I don't know about everyone else, but I can't read minds. There is no way I would of been able to guess that the question you just posted is what you needed to know.

As for your question. I am running 400# 8" springs. I have less than two turns till the top of the sleeve of my MM coil-over kit. Ride height is about the same as when I had my H&R Race springs. Pics are in the link in my sig. Unfortunately, this may not relate to you as I do not know if there is a different in lengths of the MM and D&D sleeves. Also, spring rate will have an effect on your ride height when installed.

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post #23 of 37 Old 10-18-2006, 09:27 AM
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post #24 of 37 Old 10-18-2006, 03:18 PM
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Here are my 8" 425# coilovers...

About 1" from the top of the threaded collar.


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post #25 of 37 Old 10-18-2006, 03:30 PM
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Oktavius
the truth of the matter is that a hit ttt to the wrong post, and was nice enough to ask a solid question afterwards, so get over it!

darius
thanks for the pic: that's a sweet looking setup.
how much thread engagement are you getting with that griggs setup and an 8" spring?

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post #26 of 37 Old 10-19-2006, 08:25 AM
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Oktavius
the truth of the matter is that a hit ttt to the wrong post, and was nice enough to ask a solid question afterwards, so get over it!
Again, I am not a mind reader and didnt know we had an accidental "ttt" on our hands. I was only trying to help by figuring out what you needed, and was nice enough to input what info I had afterwards.

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post #27 of 37 Old 10-19-2006, 08:43 AM
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again... get the f**k over it!

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post #28 of 37 Old 10-19-2006, 08:45 AM
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Here is a pic of how mine sit with 8" springs.


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post #29 of 37 Old 10-19-2006, 06:00 PM
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im jus gonna add onto this since it was "kindly" brought TTT...

anybody know where i can find the compresed height(before bind) on a set of coil over springs?
i picked up a set of spring specialist coils(bluecoilspring dot com). they are 400lbs by 7" long. im sure i will need to shim my coil over sleeve to get a decent ride height, but i want to make sure im not gonna bind the coils at full bump.

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post #30 of 37 Old 10-25-2006, 12:50 PM
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400# at 7"... wow!

Figure out free length 7", then figure out what compressed height is... maybe 5"... You got 800#-inhces (400# x 2") of travel. VERY little imoho.

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post #31 of 37 Old 10-25-2006, 05:50 PM
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Quote:
Originally Posted by gumby View Post
im jus gonna add onto this since it was "kindly" brought TTT...

anybody know where i can find the compresed height(before bind) on a set of coil over springs?
i picked up a set of spring specialist coils(bluecoilspring dot com). they are 400lbs by 7" long. im sure i will need to shim my coil over sleeve to get a decent ride height, but i want to make sure im not gonna bind the coils at full bump.

You answered your own question, go to www.bluecoilspring.com, call the 800 phone #, ask them what the bind height is. 7" spring? Good luck. I just installed 8" 450# springs and there is not alot of thread left above the collar.

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post #32 of 37 Old 10-25-2006, 09:05 PM
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yeah i know they are short. i can space up the collar to get enough height adjustment. jus need to make sure they have enough travel. gotta find time to call....

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post #33 of 37 Old 10-26-2006, 09:11 AM
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Or you can count...

N=Number of Active Coils
D=Wire Diameter in Inches

Example:
8 coils x .625" diam = 5.0" compressed.
7" free length
7" - 5" = 2" of travel before spring bind.

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post #34 of 37 Old 10-27-2006, 02:51 PM
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called blue coil they gave me the specs on the springs. wire dia. is .453 and there have 7.25 coils.
lookin at the spring and thier website, and the only way i see 7.25 coils is if i count tip to tip. so i dropped the flat coils to the point that they are touchin the next coil and count 6.25 active coils.

6.25 x .453 = 2.83

that leaves me with 4.17" travel before coil bind. i have roughly 3" jouce travel in my struts at ride height, so i think i should be ok. i will find out when i get some weight on the front end(engine is out). if i go any lower with the car, im gonna need fox struts and taller coils.

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post #35 of 37 Old 10-27-2006, 03:00 PM
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They will tell you the compressed height also.

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