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Old 05-03-2012, 07:31 PM   #1 (permalink)
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Default FM frame rails scraping longevity.

So I've decided I need to get my car a bit lower to the ground.
I barely clear speedbumps right now (lowered 1-1/4") when I'm alone in the car.
The FM frame rails seem like a good protection against smashing up my rails, as I've read of quite a few people using them here.
I was just wondering how much life I can expect out of them as they're only 2mm thick.
I'm also a bit scared of snagging one of the weight saving cutouts they have on a speedbump.
Can anyone shed some info on this?
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Old 05-03-2012, 07:35 PM   #2 (permalink)
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Default Re: FM frame rails scraping longevity.

I'm this low and I barely ever scrape them. Just be a careful driver. Never been snagged or scraped down.

Yeah, they're scratched up, they'll outlive the car for sure.

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Old 05-03-2012, 07:42 PM   #3 (permalink)
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Default Re: FM frame rails scraping longevity.

Considering the average speedbump here is more than 5 inches tall and has a concave entrance, I'm 100% sure I will scrape on 95% of them .
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Old 05-03-2012, 07:42 PM   #4 (permalink)
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Default Re: FM frame rails scraping longevity.

If you're getting them just for scraping and not bracing, why not just fab your own out of slightly thicker material?
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Old 05-03-2012, 07:44 PM   #5 (permalink)
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Default Re: FM frame rails scraping longevity.

true my mx5 is only lowered about 4cm and im having trouble with alot of speedbumps..
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Old 05-03-2012, 07:45 PM   #6 (permalink)
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Default Re: FM frame rails scraping longevity.

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Originally Posted by Opgedronken View Post
Considering the average speedbump here is more than 5 inches tall and has a concave entrance, I'm 100% sure I will scrape on 95% of them .
5 inch tall speed bump? 0_0

I would NEVER even attempt to go over one, and I rarely let obstacles get in my way
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Old 05-03-2012, 07:46 PM   #7 (permalink)
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Default Re: FM frame rails scraping longevity.

I have an unusually high speedbump at the entrance to my home. I installed the FM rails last year and drag my car over them at least twice a day, no worries. I have since raised the car and only drag on it with a passenger and a full tank of fuel. The damn bump is so high, my wife's stock height NB would bottom out on it.
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Old 05-03-2012, 07:48 PM   #8 (permalink)
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Default Re: FM frame rails scraping longevity.

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I have an unusually high speedbump at the entrance to my home. I installed the FM rails last year and drag my car over them at least twice a day, no worries. I have since raised the car and only drag on it with a passenger and a full tank of fuel. The damn bump is so high, my wife's stock height NB would bottom out on it.
do you have to "ricer dance" over them lol
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Old 05-03-2012, 07:48 PM   #9 (permalink)
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Default Re: FM frame rails scraping longevity.

so you have trouble with one speedbump. we have alot of them. very anoying speedbumps.
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Old 05-03-2012, 07:51 PM   #10 (permalink)
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Default Re: FM frame rails scraping longevity.

They're everywhere, and 5" is just an average one, they get higher and they're very steep .

Edit:

And we have these, a lot of them. Also about 5" high, impossible to avoid or take diagonally.

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Old 05-03-2012, 08:05 PM   #11 (permalink)
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Default Re: FM frame rails scraping longevity.

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do you have to "ricer dance" over them lol
nope, just slowly rolled the front wheels over, wait for the car to hit onto the bump, goose the throttle/feather the clutch to prevent high-centering, done.
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Old 05-03-2012, 08:15 PM   #12 (permalink)
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Default Re: FM frame rails scraping longevity.

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They're everywhere, and 5" is just an average one, they get higher and they're very steep .

Edit:

And we have these, a lot of them. Also about 5" high, impossible to avoid or take diagonally.

these aren't as bad as long as you know where they are though. you can keep 2 wheels on the side of the street and just roll one side of the car over. These would be a bitch if you encountered them at full speed at night time though and didnt realize they were there. Bye bye undercarriage
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Old 05-03-2012, 08:24 PM   #13 (permalink)
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Default Re: FM frame rails scraping longevity.

I smashed over a particularly high one of those once, luckily that was still at stock height so no (noticeable) damage .
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Old 05-03-2012, 09:00 PM   #14 (permalink)
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Default Re: FM frame rails scraping longevity.

What the hell? I've never seen a speed bump like that before.
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Old 05-03-2012, 09:08 PM   #15 (permalink)
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Default Re: FM frame rails scraping longevity.



i have fm rails and they never get snagged. These things take a beating and they are still super straight (just scratches). they are a must have if u dont want to destroy our oem cardboard rails lol
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Old 05-03-2012, 09:35 PM   #16 (permalink)
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Default Re: FM frame rails scraping longevity.

I guess I'll be getting them either way then, as anything is better than the stock rails .
Your car seems pretty low, so I can imagine them holding up to a beating pretty well.
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Old 05-04-2012, 12:11 AM   #17 (permalink)
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Default Re: FM frame rails scraping longevity.

Mine scrape all the goddamn time and the fronts are kinda messed up from getting snagged on shit. It was so bad that I unhooked my airbags because I was scared I'd hit a really big bump and have them deploy as happened with fabel. Finally just raised the car about 1/3 inch and it's fine now.
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Old 05-04-2012, 12:34 AM   #18 (permalink)
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Frame rails are for pussies

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Old 05-04-2012, 03:52 AM   #19 (permalink)
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Default Re: FM frame rails scraping longevity.

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Old 05-04-2012, 04:00 AM   #20 (permalink)
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Default Re: FM frame rails scraping longevity.

Also some of the speedbumps around here


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Old 05-04-2012, 05:40 AM   #21 (permalink)
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Default Re: FM frame rails scraping longevity.

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Originally Posted by Frankie850 View Post
Frame rails are for pussies
Well for one Miatas don't sell for near scrap metal value here in Holland, so I'd like to keep my rails intact .
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Old 05-04-2012, 06:47 AM   #22 (permalink)
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Default Re: FM frame rails scraping longevity.

I think the very fronts of my FM rails are about half as thick as they used to be, I can measure it if I remember tomorrow since they're off the car. But they really do take a beating, I've never had an issue snagging them on anything, they just scrape right across. My rails were about .5" off the ground right before I took it all apart for the build.
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Old 05-04-2012, 08:21 AM   #23 (permalink)
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Default Re: FM frame rails scraping longevity.

^^spammer!
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Old 05-04-2012, 09:06 AM   #24 (permalink)
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Default Re: FM frame rails scraping longevity.

I reported him. He should be banned sometime today
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Old 05-05-2012, 01:34 AM   #25 (permalink)
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Default Re: FM frame rails scraping longevity.

I have the rails myself but my car isn't really low. I just don't like the fact that they welded threads on the passenger side for the fuel lines and rails. Wish they just weld it on the side. The ones that are on my car are all scraped to nothing after a week of driving.

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Old 05-05-2012, 02:09 AM   #26 (permalink)
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Default Re: FM frame rails scraping longevity.

im not lowered that much at all i have tokico illuminas and fm springs, but i still damn near high center on some speed bumps around here that are SUPER steep. my 65 Nova SS Resto mod is way worse....the front crossmember is about 1 1/4" off the ground lol AND the car is super long with almost 2" of travel in the coilovers. that thing high centers on driveways into shopping centers lol
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Old 05-05-2012, 03:08 AM   #27 (permalink)
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Default Re: FM frame rails scraping longevity.

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Originally Posted by rikaro View Post
I just don't like the fact that they welded threads on the passenger side for the fuel lines and rails.
Luckily the ones I'm looking at don't have this feature. They're totally smooth on the bottom.
The real FM rails are way too expensive to get shipped to the EU.
My car will probably be at around the same height as yours, just barely tucking tyre .
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Old 05-22-2012, 05:01 PM   #28 (permalink)
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Default Re: FM frame rails scraping longevity.

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Originally Posted by DazedAndConfused View Post
These would be a bitch if you encountered them at full speed at night time though and didnt realize they were there.
General Lee business
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Old 05-22-2012, 08:21 PM   #29 (permalink)
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Default Re: FM frame rails scraping longevity.

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General Lee business
Ironically this just happened to me a couple of days ago. My car ended up okay other than the alignment, but I had a concussion for most the day. lol Also I didn't bust my oil pan which I guess proves that mazdaspeeds dont need skid plates.
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Old 05-22-2012, 08:55 PM   #30 (permalink)
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Default Re: FM frame rails scraping longevity.

IIRC, John (Breezy) had FM frame rails - he had (has?) no issues.
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