MM Coil Over Spring Rates??? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 15 Old 08-16-2015, 11:12 AM Thread Starter
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MM Coil Over Spring Rates???

Ok, here is my situation.....

A few days ago the passenger side ball joint on my 94GT started singing a very squeaky tune. Sprayed it with WD40 and it immediately got nice and quiet. I have since priced out Ball Joint replacement vs. stock replacement arms. In both cases, the parts and labor involved put me right near a pair of MM Tubular Control Arms-

Non-offset Front Control Arms, 1994-04 Mustang

Since I already have their CC Plates and a brand new set of SA Koni Yellows waiting to go in, I am only a coil over kit away from being being done with the whole front end for the most part. The car has, as far as I know, either Motorsport B or C springs in it.

What is a good Coil Over Spring Rate for a street driven car that runs on crappy Southern New England roads? Should I stay right around 300lbs.?

I have every intention of calling MM tomorrow to get their advice. I am just curious what you folks may have experience with.

Once the front end is done, I am going to take care of the rear lower control arms and shocks. At that point(few weeks out) I will probably get a matching pair of rear springs if MM recommends it.

What say you all???

Thanks.

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post #2 of 15 Old 08-16-2015, 11:34 AM
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Do you auto-x or HPDE? If not, 275# will be plenty; nice ride, decent handling, the bottom of the range handled by the Koni yellows. For slightly more aggressive street handling, go 325#. For auto-x/hpde, go #375, the max suggested by MM for that dampener.

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post #3 of 15 Old 08-16-2015, 01:59 PM Thread Starter
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275lbs. is the bottom of the Koni range? I was not aware. Sounds like 300lbs is where I will probably start.
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post #4 of 15 Old 08-16-2015, 02:46 PM
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I'm on 400/300 and it's too soft for me, then again I track the car.
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post #5 of 15 Old 08-16-2015, 03:56 PM Thread Starter
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I'm on 400/300 and it's too soft for me, then again I track the car.
What shocks and struts?
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post #6 of 15 Old 08-16-2015, 05:37 PM
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275lbs. is the bottom of the Koni range? I was not aware. Sounds like 300lbs is where I will probably start.
Matching spring rates with dampers

300 is a good street rate with some decent handling.
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post #7 of 15 Old 08-16-2015, 05:43 PM
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I run a 250 and it is a little soft.

'01 GT:
YSI, 20lbs
89 LX:
347 stock
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post #8 of 15 Old 08-16-2015, 05:53 PM Thread Starter
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Matching spring rates with dampers

300 is a good street rate with some decent handling.
That's basically what I want. So 300 it is. Then I can always go up if necessary.
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post #9 of 15 Old 08-17-2015, 09:55 AM
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I'm on 400/300 and it's too soft for me, then again I track the car.
What shocks and struts?
MM sports

Will be on sale at some point so I can swap for MM race
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post #10 of 15 Old 08-17-2015, 08:13 PM
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My first set of coil-overs was 300#/in, living in southeastern CT. I think most folks would be happy with 300#/in, particularly matched with good dampers.


'89 GT convertible, N/A 357W, MM front susp w/425# coil-overs and Koni D/As, MM TA/PB rear setup (Koni Yellows, 390-430# springs), Stoptech 332mm / 12" Baers, MM 6 point rollbar, Maier 1.5" flared fenders & quarters, 18x9.5" front/18x10.5" rear Enkei RPF-1s (street), 18x10" CCW C-10s (track), etc...
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post #11 of 15 Old 08-17-2015, 09:18 PM Thread Starter
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Just ordered the Coil Over kit. Spoke with MM today about rates. They are going to contact me with a questionnaire regarding springs. So we will see what they recommend. Couldn't swing the A-Arms this week. So they will have to wait a bit. Oh well.
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post #12 of 15 Old 12-28-2015, 01:44 AM
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I know this thread is a few months old but what did you decide on spring rates? I ordered CO for my 93gt and have a panhard bar with torque arm I'm about to install. I am trying to decide on from spring for the coil overs with bilsteins struts and if I should get the lighter or heavier TA springs.

I had thought 300 pound front with the lighter torque arm spring.
post #13 of 15 Old 12-28-2015, 11:44 AM
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I have 300# with Bilstein HD's and the MM C/O kit on the front, Panhard in back. I am about to go PM3L with the lighter TA coils.
PM Jack Hidley on here. He will get you hooked up.

'88 LX hatch. Mild 331. Full MM suspension minus the Torque Arm, Cobra Brakes. Not as slow as it used to be.
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post #14 of 15 Old 01-05-2016, 11:32 AM
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What shocks and struts?
MM/bilstein Sports

i plan on going MM3 race

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post #15 of 15 Old 02-12-2016, 03:19 PM
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Swapped to the 500/400, not as stiff as i thought it was going to be. However the car does feel more firm around corners.

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