Ground Control Coilover Kit Install - Page 17 - Mazda3 Forums : The #1 Mazda 3 Forum
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post #161 of 175 (permalink) Old 05-12-2014, 07:10 PM
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I have a pair of newer 6" Eibach ERS springs that have one less coil than the older models. So the compressed length is shorter than the older version, which means more travel before coil bind. Another option, might be FCM style bumpstops that would make contact before coil bind. (or at least soften the hit.)
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post #162 of 175 (permalink) Old 05-12-2014, 07:25 PM
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post #163 of 175 (permalink) Old 05-12-2014, 10:10 PM Thread Starter
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Thanks! Did not know that these existed. The usable strokes seem to be about the same.

Added to my database.

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post #164 of 175 (permalink) Old 05-12-2014, 10:35 PM
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usable strokes seem to be about the same.
Oh. Well that's good to know.


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post #165 of 175 (permalink) Old 05-12-2014, 11:24 PM Thread Starter
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Originally Posted by JTilus View Post
I have a pair of newer 6" Eibach ERS springs that have one less coil than the older models. So the compressed length is shorter than the older version, which means more travel before coil bind. Another option, might be FCM style bumpstops that would make contact before coil bind. (or at least soften the hit.)
Looking through the Eibach (downloaded) catalog now; could you please share a part number?

Will also research more efficient bump stops. Fat Cat Motorsports......?

And thank you.

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post #166 of 175 (permalink) Old 05-13-2014, 12:32 AM
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Looking through the Eibach (downloaded) catalog now; could you please share a part number?

Will also research more efficient bump stops. Fat Cat Motorsports......?

And thank you.
Looks like part #'s haven't changed. Just the design. So the part # should be something like: 0600.250.0XXX (First 4 digits being spring length, next 3 digits are spring diameter, and last 4 digits are spring rate.)

I'm assuming this is a design change, as I have 2 pairs of 6" Eibach ERS springs and the newer ones have one less coil. They are also different rates. So maybe that is part of the reason for the difference?

Yes. Fat Cat Motorsports. Not sure if they have anything direct-fit, but might be worth looking into.
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post #167 of 175 (permalink) Old 05-13-2014, 02:17 AM Thread Starter
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I'm assuming this is a design change, as I have 2 pairs of 6" Eibach ERS springs and the newer ones have one less coil. They are also different rates. So maybe that is part of the reason for the difference?
Yep.

The number of coils, diameter of the wire, diameter of the actual spring, and spring material all figure into the actual spring rate.

So, no design change at all. They are simply two different rates.

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post #168 of 175 (permalink) Old 05-13-2014, 09:36 AM
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Thanks! Did not know that these existed. The usable strokes seem to be about the same.

Added to my database.
I wasn't sure how they'd compare but one thing to take into account when you run swifts is they weigh less, don't coil bind, and sit flat. Only negative is the minimum height if surpassed can do damage to the spring.
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post #169 of 175 (permalink) Old 05-13-2014, 03:00 PM Thread Starter
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Spring Rate Adventure

Hey, thanks to everyone who contributed. Learned a little more than before, and now have some new resources I didn't know existed before asking my question.

It became clear, as I suspected, that there is no one correct answer. As with most things "Car", it just......depends.

How much spring is too little, how much is too much......."It depends". Driving style, car setup, course factors....... "It depends".

So, I'll have to find this out for myself. Find "my" answer.

I will be trying the 525# springs in the front this next weekend. That in fact is close to the MINIMUM rate that GC recommends for our cars with their kit. I like the 700# springs on the back, so they stay.

I will report back as to what effect this move has on the car's balance. Fingers crossed.

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post #170 of 175 (permalink) Old 05-14-2014, 06:02 PM
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We had 7" up front... 6" is too short for racing. We only did it to clear the tall 265/35/18.

and........... I only ran 6" after I retired my MZ3 for autocross so I can tuck the 18x9.5 +45 up front. lol

We have 1000lbs in 6" if you're interested in giving that a shot, you can swap it at the event. Just jack the car up in the middle.


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