Bottoming out at highway speeds

FOX87STANG

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I bought a 04 vert last year and it has a Stifflers fit system. It only has 2.75" of clearance. It's lowered on Eibach springs and has the stock Bilstein shocks. At speeds over ~40 mph it often bottoms out due to the force of the car pushing downward if that makes any sense. It doesn't have to be a rough road either. I can simply be at the bottom of two smalls hills and it will scrape the fit system. I checked the shocks and they retract and extend as they should. What are some of my options to keep this from happening? I attached a picture of the car so you can get an idea of how low it is. It doesn't seem too low in my opinion but maybe that's the root cause.
 

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Zemedici

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Springs more than likely the culprit, eibachs hammer them.

Could change to different springs to raise her up a bit.
 

me32

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Its the vert struts/shocks. They are softer the coupe. I would look at getting some stiffer struts/shocks.
 

shurur

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If you don't have a FLSF like stifflers, you should get that before fooling around with springs.

The verts, like all verts, come with softer springs than the coupes. This is so the stiffer springs don't shake the car apart.

Full length subframes are the first mod on a vert..actual all mustangs up to 2004, but especially verts.

Edit...you mentioned the fit system.
Then I would look at what strut/shocks you have matched to the Eibachs first...as others have said, those stock strut/shocks may be all pissed out...this would give you the raw spring experience you are getting.

I would get something that you could upgrade to a higher spring rate should the strut/spring not fix your problem with the eibachs.
 
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HudsonFalcon

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I had the Eibach springs and while they lowered the car to the perfect height I would scrape a lot.

Switched to H&R Race with Bilstein HD’s and I never scrape. Plus, the car handles much better and feels stiffer/flatter in corners.
 

DSG2003Mach1

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If you’re gonna do springs and shocks/struts might not be much more to get MM coil overs, can stiffen it up without killing the ride and adjustable on the height

And I had bilstein HD with H&M’s springs and were a little harsh at times
 

shurur

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If you’re gonna do springs and shocks/struts might not be much more to get MM coil overs, can stiffen it up without killing the ride and adjustable on the height

And I had bilstein HD with H&M’s springs and were a little harsh at times
Can't lie..my H&R race springs are a rough ride...the word visceral comes to mind.
 

DSG2003Mach1

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Can't lie..my H&R race springs are a rough ride...the word visceral comes to mind.

My main issue was like hitting the transition from asphalt to concrete when going over a bridge and stuff like that, it was like getting smacked. Definitely notice shit like that more as you get older
 

68gtscode

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Interesting feedback in this tread. I had H&R Race springs with MM isolators (one removed in the back for a more level stance) and don’t recall the ride being too harsh.
 
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01yellercobra

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I've experienced Eibach springs on three cars. Two 98 GT's and an 06 GT vert. They all had the good stance, but the issue is the Eibachs are soft springs. They're made that way because a lot of people want the stock ride while being 2" lower. Can't have both. Even with good shocks/struts the ride is meh at best IMO. I put Koni's on the 06 and it did make it less skittish, but it still didn't ride as well as my 04 with Bilsteins and H&R race springs.

As mentioned a good coil over is the best of both worlds IMO. I'm a little lower than I was with the H&R's, but it rides just as good and handles really well. I would say if you're going to invest in coilovers to put the money into Vikings. I installed a set on a buddies car and they're really nice. It has me thinking about ditching my MM set up.
 

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