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2G Bent frame/unibody rails. Can this car be saved?

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Joe Gekko

Proven Member
41
1
Jul 28, 2015
Kingwood, Texas
I've attached a picture of the unibody reinforcement that runs directly under the driver's seat. As you can see, it's nowhere near straight, and it's so bent up that there is a mound inside the car in the driver's floorboard. I have to assume that some body either drove the car up onto something or tried to jack it up from the floorboard at some point in it's life. There is another stoved in section of railing on the passenger side, behind the front passenger seat, but it's nowhere near this bad and doesn't seem to have affected the floorboards inside the car.

Is there any way to repair this kind of damage, and flatten out the floorboard again? The only thing I can think of would be to cut out the bent rail, hammer down the floorboard, and weld in a section of reinforcement.

Anybody have any experience with this sort of thing? How did you fix it? Or is this it time for a part-out?

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You could try laying a 2x4 on the the bent section and hit it back down with a hammer and see if that helps, if that doesn't work you could cut out the bent spot, flatten it out with the 2x4, then we'll in new reinforcement.

I wouldn't say it's anywhere near as bad to do a part out though.
 
Look for this thread in search,-- Undercarriage structural reinforcement--

It is well detailed and good info, I would link you to it but I dont know how.
I also make mention of it in my build thread. It would not be very hard to do and you may also bolt the piece in.
 
I would just look for a rolling chassis to swap the drive train into. The car will never be normal again, and the money spent to try to fix the problem could buy you another car. You do not want to mess with the handling of the car. Your life is more valuable than a couple hundred dollars. You need to look at the big picture.
 
From what I have seen on many dsms they all have had this problem and many a lot worse than yours.
I dont think it is worth it for you to try to find another car as it will probably be as bad or worse than yours, those reliefs are built from factory as a safety and they get beat up over the years, they are there so in case of a crash they give, body shops call it egg shape.
By the picture yours seem to be in one spot, before you do all that work, you could also have underdoor bars made just as they do when making a roll cage and it would not be very expensive.
Good luck.
Mandy
 
Someone probably jacked the car on that point, and it's not meant to hold weight, so it collapsed.

One of the previous owners of my car caved in the drivers side beam, and they kept going. The floor section collapsed till it hit the seat cross beams.

I don't think you can hammer it back out. I ended up fabricating a piece that looked similar to the oem beam and just replaced the section. While I had it out I was able to hammer the thin floor section back to where it belongs.
 
PO probably ran something over. Kind of tough getting a jack to the frame rails even at stock height unless someone used a 4 point lift there. I would straighten it out as said before with a 2x4 and a hammer from inside the car and call it good. I don't see how it is a safety concern.
 
I have a 2 post lift and normally lift DSM's by the unibody pinch weld. However I have in the past lifted by those rails in order to more easily get to the side skirt clips and such. The rails did not budge at all under the cars weight. Those lumps you guys are experiencing took some force either from running something over or more than likely smacking the top of a speed bump.
 
its only a real concern if you live in a state that does body inspections. my 2g looked worse because mine sat non running in a field for 10 years and a farmer moved it around with a front end loader with forks on it. i beet the floor board flat with a 10lbs short handled sledge, and when i get around to doing body work i will fix the underbody rails so that if i ever sell the car there won't be any questions asked.

(never mind the the fact that my entire SRS and all airbags are currently disabled. details... did i mention my car sat in a field for 10 years?)
 
Leave it be. Both mine have it, most likely from a shop lift. How big is the mound on the floorboard?

It's about 1.5" at the highest. Not enough to make it undriveable. When I was looking the car over before I bought it and it got hooked to the tow truck for the ride home I honestly thought it was just a lump in the carpet or something under the floormat (the car was full of junk, so I didn't think anything about it).
 
Here is another option, you would have to call them and find out the inner width of the channel, very good price and it looks like it will do the job.
Go to V8 Roadsters web page and look for their frame rails.
Miatas have a very similar construction on the floor pan, it is worth a
look.
It will probably add a little strength to the body also.
 
2gs are horrible for gaining jack damage very easily. Most are way worst than yours. I just picked up a 98 gsx that has only one bend on the passenger frame rail and i feel like i hit the lotto. It all comes from incorrectly jacking the car up. I always thought the most effective way to repair them is to weld something to protrude downwards that you can smack with a hammer and pull down. Then simply cut the welded pieces off.
 
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