KYB Excel-Gs CRAZY STIFF--did I do it right? - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 13 (permalink) Old 04-06-2016, 11:55 AM Thread Starter
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KYB Excel-Gs CRAZY STIFF--did I do it right?

Hey, guys. I just bought some KYB Excel-G shocks/struts for my 2004 3 hatch. Just put them in yesterday, and they are RIDICULOUSLY STIFF!!! It bounces, stiffly, over bumps. I almost got motion sickness when I test drove it yesterday on the freeway due to the stiff bouncing. I was wondering if I maybe overtightened the bolts that connect the A-arm to the hub or something on the rear, although I can't account for stiffness in the front.


Background info: I've had the car lowered on Eibach Pro-Kit springs with stock shocks/struts, and Mazdaspeed lowering camber plates on the rear since it was new. It's got 200K miles on it now and I decided to go back to the stock ride height because I'm giving the car to my son. So now it has KYB Excel-G shocks/struts with stock springs and camber plates back on it. This is what confuses me: shouldn't it not bounce at all, as the stock springs that it has now are lighter than the Eibachs? I'm really frustrated because I bought the KYBs because they said they were designed to mimic stock stiffness. That's what I want. This thing now, it corners amazingly but is harsh as hell on the street. It actually corners better than it did when it was lowered! But you feel EVERYTHING! Worse than that, you bounce after every little bump! Do these struts/shocks have any break-in period or something? PLEASE HELP!

Silver 5-door, Pro-Kit springs, Injen CAI, Draxas cat-back.
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post #2 of 13 (permalink) Old 04-06-2016, 06:21 PM
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Well the Excel-G is a OEM replacement, and not an upgraded shock. So it really shouldnt be much of a difference.
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post #3 of 13 (permalink) Old 04-06-2016, 06:54 PM
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It could be that your old shocks/struts deteriorated over time and you didn't notice until you installed the new ones. I replaced my rear shocks with the Excel-Gs and it rode no different than it did with the stock ones.
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post #4 of 13 (permalink) Old 04-06-2016, 08:07 PM
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How many miles on the old shocks....?

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post #5 of 13 (permalink) Old 04-06-2016, 08:07 PM Thread Starter
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Originally Posted by madmatt2024 View Post
It could be that your old shocks/struts deteriorated over time and you didn't notice until you installed the new ones. I replaced my rear shocks with the Excel-Gs and it rode no different than it did with the stock ones.

Here's the thing: I remember the 3 when I first got it, it had significant body squat under acceleration and braking. None of that any more. I mean zero. Its suspension is stiffer than my Focus ST.


Now, I've had my stock springs in storage in a barn in AZ that is over 100 degrees most of the year, for like 8 years. I'm wondering if the springs could be stiffer now than when I took them off the car? I know, they're steel, sounds ridiculous, right? I just can't account for it any other way, if you're saying the Excel-Gs are practically the same as stock.

Silver 5-door, Pro-Kit springs, Injen CAI, Draxas cat-back.
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post #6 of 13 (permalink) Old 04-06-2016, 08:09 PM Thread Starter
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How many miles on the old shocks....?
207,000 miles. Yeah, they were toast.

Now, I've opened the hatch and hopped up and down on the rear bumper and there's no compression of the shocks. Doesn't this mean it's not all in my head?

Silver 5-door, Pro-Kit springs, Injen CAI, Draxas cat-back.

Last edited by pygmysled; 04-06-2016 at 08:29 PM.
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post #7 of 13 (permalink) Old 04-06-2016, 08:34 PM
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.....

Yeah, you were just riding on springs.

Shocks are usually replaced every 50k miles lol

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post #8 of 13 (permalink) Old 04-06-2016, 08:41 PM Thread Starter
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.....

Yeah, you were just riding on springs.

Shocks are usually replaced every 50k miles lol
Dude, it's not just that. And I'll tell you why:

1) The stock springs and shocks should absolutely NOT be stiffer than my 2013 Focus ST. They are.

2) When I jump up and down on the rear bumper, it should compress the shocks. It doesn't.

3) I remember how it was with stock springs and shocks before I put the Pro-Kit springs on. It had significant body squat with acceleration and braking. Now it has zero. ZERO.

Now, it could be the springs. These are stock springs but they've been laying around in 100+ degree temperatures for the better part of a decade. Couldn't that have an effect?

Silver 5-door, Pro-Kit springs, Injen CAI, Draxas cat-back.
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post #9 of 13 (permalink) Old 04-06-2016, 08:58 PM
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Quote:
Originally Posted by XCNuse View Post
.....

Yeah, you were just riding on springs.

Shocks are usually replaced every 50k miles lol
Back in say the 1970s, replacing shocks and struts every fifty-thousand miles was definitely a good idea; these days shocks and struts can easily last over 200,000 miles (not saying they always do, just that 50K miles is as far on the low end as 200K miles is on the high end).

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post #10 of 13 (permalink) Old 04-06-2016, 09:23 PM
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Can you see a part number on the springs?

Did you get the quick struts?

I just put the KYB Excel G quick struts on my wife's 14 year old Accord, and they were stiffer, but none of what you're describing.

Sent from the wrong side of the tracks.
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