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post #71 of 175 (permalink) Old 01-25-2014, 12:34 PM Thread Starter
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Rename this Topic?

I started this as an exploration of the new Ground Control setup that had just come out, but it has evolved into really a discussion of many Coil Over systems and options. Partly my fault since the complete installation of my GC stuff has been delayed.

I don't mind or really care, but seems either we focus this on the one thing or could a Moderator please rename this to simply "Coil Over Kits and Installation".

Needs to be what it says it is.

Thx.

Scott Meyers
2006 Mazda 3S Sport - Making it the best that it can be
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post #72 of 175 (permalink) Old 01-25-2014, 04:39 PM
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Quote:
Originally Posted by tigermack View Post
SO, MUCH, WRONG.
Mack! Share your wisdom with us.

And this has definitely turned to a spring perch options thread lol


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post #73 of 175 (permalink) Old 01-26-2014, 04:40 AM
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Nuse isn't all the way wrong as we do use softer springs for low-traction situations (e.g. ice racing), but between different grades of summer tires, on most tarmac you can pretty much pinpoint an ideal range of spring rates to run, and that's going to be whatever gets you to a natural frequency of 1.8-2.2Hz in front, then:

For track cars, often the rear is setup in the same range, 1.8-2.2Hz;
For AutoX cars, often the rear is setup with >2.2Hz.

Neither AutoX or tracks are bumpy enough to the extent where the cars need significantly softer springs and damping forces; you pretty much need to be rallying to encounter that kind of bumps.

Because of that, on a non-aero car springs are chosen largely to affect weight transfer. Stiffer springs = faster weight transfer, and for the most part less maximum grip as the increased load transfer to the outside tires decreases the total grip level per axle. If you are driving fast enough at an AutoX, the corners are literally going to come up faster than the speed the stock spring rates can move the chassis. On a large track this is rarely an issue, and you can get away with running softer rates. This is the exact opposite of Nuse's guess.


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@bmspec Custom aero/suspension design
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post #74 of 175 (permalink) Old 01-28-2014, 09:55 PM Thread Starter
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Ground Control Rear Install

OK, back on track........

Got the rears in today. Learned a lot.

Just rears on so far (ProKit front still). Full low, need to go up some:



As installed:



Getting ready:



A little too low for the street (15" wheels/tires):



Lower spring seat:



Any questions?

Fronts go in this weekend.

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2006 Mazda 3S Sport - Making it the best that it can be
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post #75 of 175 (permalink) Old 01-28-2014, 11:37 PM
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Why 15" wheels?

David Hedderick
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post #76 of 175 (permalink) Old 01-28-2014, 11:42 PM
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Quote:
Originally Posted by miata_racer View Post
Why 15" wheels?
I'm curious as well. Have a few ideas but I'll hold my thoughts for the OP.

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post #77 of 175 (permalink) Old 01-28-2014, 11:46 PM Thread Starter
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Why 15" wheels?

Quote:
Originally Posted by miata_racer View Post
Why 15" wheels?
Because they work better than 16's or 17's........ Everyone knows that!

It's a school of thought. Some feel that the 17's are better, and some of us disagree.

I'm having some very good results doing the 2.0 with these 15's.
  1. Lighter weight
  2. Cheaper
  3. 1" lower
  4. Results

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Last edited by mazda3az; 01-28-2014 at 11:55 PM. Reason: Added stuff
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post #78 of 175 (permalink) Old 01-28-2014, 11:59 PM
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Quote:
Originally Posted by mazda3az View Post
  1. Lighter weight
  2. Cheaper
  3. 1" lower
  4. Results
Pretty much nailed my mental list.

Unless you are precluded from using 15" wheels due to the size of your brakes or tire choice (can't get an appropriately sized tire) they are usually your best bet. Lots of different compounds and sizes available.

If you simply can't fit a 15" wheel for the above reasons, 17's are almost always going to be your wheel size of choice for the same reasons above (lots of tire sizes and compounds compared to wheels larger than 17").

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post #79 of 175 (permalink) Old 01-29-2014, 12:42 AM
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I considered 15s on my 3 but then I remembered the 3's strong suits: torque and a tallish 2nd gear. Aren't you guys having wheelspin issues?

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post #80 of 175 (permalink) Old 01-29-2014, 01:22 AM Thread Starter
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Torque?

Quote:
Originally Posted by miata_racer View Post
I considered 15s on my 3 but then I remembered the 3's strong suits: torque and a tallish 2nd gear. Aren't you guys having wheelspin issues?
None. I did when I ran my '08 3S Hatch, and had to be very careful with throttle input especially in corners. Took practice. Even had lots of wheelhop then.

The 3i has enough torque to get the job done, and seems to RPM a lot more freely. Much easier to control throttle in corners. Much.

I bought an "i" on purpose, and so for it is meeting or exceeding my hopes.

Did I mention the better gas mileage?

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