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Old 09-13-2011, 06:26 PM   #21
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I think I have an idea on how to make the door just a tad stiffer, and still be light. I have cut alot of the spare passanger door already, and want to do a test fit on the car. I will try to correct some of the mistakes on the driver door if it proves to be too flimsy.
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Old 09-13-2011, 06:40 PM   #22
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Mine is still quite rigid. When deciding how much of mine to cut, it looked like if you take out the entirety of the top portion that sits behind the elbow cushion, inward of the window, you'll save more weight but it'll get flimsy. That part is double, and in places, triple thick, so I took out the majority of it but left a bit to keep the rigidity. That portion and the reinforcement bar that sits inside the door against the outer skin are the two heaviest portions from my observations, so you of course want to take out as much as possible from there...
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Old 09-13-2011, 07:21 PM   #23
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Does anyone have a weight of just the two door bars that are in the factory door ? im debating pulling mine.

FWIW; I weighed one of my doors, complete with power window and mirror it weighed 55Lbs.
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Old 09-13-2011, 09:37 PM   #24
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Quote:
Originally Posted by 92Miata View Post
Does anyone have a weight of just the two door bars that are in the factory door ? im debating pulling mine.

FWIW; I weighed one of my doors, complete with power window and mirror it weighed 55Lbs.
Its alot more involved than just pulling them out. They are spot welded in place. And my driver side door bar was spot welded and had some body glue holding to the door skin. Mine are out in the junk pile, I will go weigh one.

Its just over 6 pounds. This is on my 90. So later years may be different.
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Old 09-15-2011, 01:08 PM   #25
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i'm just gonna leave those bars until or if i ever get a cage with door bars welded in. i'm usually the first with the cutoff wheel in hand, but in this case i'm going to err on the side of safety. however small that may be, lol.....
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Old 09-15-2011, 03:08 PM   #26
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^^ Yep I am leaving them in for the same reason as well. I am already at minimum weight for my class, so I would have to add that mass back to the car. The only benefit would be mounting the makeup mass lower in the chassis for CG. I would rather have the side impact protection.
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Old 09-15-2011, 03:47 PM   #27
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Has anyone been able to cut the doors and keep the manual windows?
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Old 09-15-2011, 04:07 PM   #28
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Re. the apparently spot-welded and glued side impact beams - how exactly have you lot gone about taking them out? I can't view my car at the moment, but I'm busy formulating a plan of door-attack for next time I work on it, ha.
Before anyone cries "safety", I'm having door bars welded in.
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Old 09-15-2011, 05:40 PM   #29
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Quote:
Originally Posted by spoolin2bars View Post
i'm just gonna leave those bars until or if i ever get a cage with door bars welded in. i'm usually the first with the cutoff wheel in hand, but in this case i'm going to err on the side of safety. however small that may be, lol.....
I would do the same thing on the driver side. It is just a few minutes work. I went ahead and took the passanger crash bar out, since that door will only see dragstrip duties.
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Old 09-15-2011, 05:45 PM   #30
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Quote:
Originally Posted by owenwilliams View Post
Re. the apparently spot-welded and glued side impact beams - how exactly have you lot gone about taking them out? I can't view my car at the moment, but I'm busy formulating a plan of door-attack for next time I work on it, ha.
Before anyone cries "safety", I'm having door bars welded in.
Use an air or electric powered cut off wheel (angle grinder or die grinder with a thin wheel about 4"-5" in diameter). When you remove the inner door skin, you have access to it. You cut at the ends of the crash bar. The bar does not actually touch the outer skin, at least in the door I just gutted. Very simple job.
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Old 09-15-2011, 10:47 PM   #31
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Quote:
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From what I have heard, you're not going to be able to make Lexan windows for the miata. The curvature has to be so spot on that there's nearly no chance of getting it right just by heating and bending the lexan.
Take the lexan sheet, Toss it on top of the stock window (concave down) put few weights on the outsides and heat away. The lexan will curve with the stock windows curvature.
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Old 09-16-2011, 08:23 AM   #32
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I have lexan windows on my car, took the front triangle part out and put a metal frame around it to keep it in place...
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Old 09-16-2011, 10:54 AM   #33
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Finally got around to taking out the factory crash bar in my XP car last night. Used a rotary spot weld bit and took out the 7-8 welds at the ends of the bar. Did need to use the mini-sawsall on the part welded to the door latch. No good way to drill it, my 90 degree drill might have worked but my compressor is out of commission.
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Old 09-16-2011, 10:58 AM   #34
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Quote:
Originally Posted by mcfandango View Post
Finally got around to taking out the factory crash bar in my XP car last night. Used a rotary spot weld bit and took out the 7-8 welds at the ends of the bar. Did need to use the mini-sawsall on the part welded to the door latch. No good way to drill it, my 90 degree drill might have worked but my compressor is out of commission.
Where is a good place to get a spot weld bit? Common tool?
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Old 09-16-2011, 11:06 AM   #35
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http://www.harborfreight.com/3-8-eig...ter-95343.html

Works like a champ. You'll need to punch a starting hole for the middle of the bit to ride in. I use a punch and usually use a fresh 1/8" bit by hand to give it a little more depth. Over half the time I just drill the whole thing out unless I'm trying to save the panel. Like when I cut the rear seat mounts out with it. Some welds seem to require though.

If you dont care about the panel or anything behind it, a stepped drill bit works great too. Wouldnt recommend it on the door skin facing ones. Not enough room between the spot weld and the skin. I used the stepped bit on the welds not facing the door skin (it's faster).
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Old 09-29-2011, 10:15 PM   #36
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I decided to remove the top crash bar (thick sheet metal that sandwiches two other layers just under the window.

I decided to buy this cool tool kit from a Snap On Dealer friend that lives across the street from my shop.



Attached Thumbnails
How did you gut your door-img_6709.jpg   How did you gut your door-img_6695.jpg   How did you gut your door-img_6696.jpg   How did you gut your door-img_6705.jpg   How did you gut your door-img_6713.jpg  

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Old 09-29-2011, 10:21 PM   #37
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I started to use my new found tool, and in five minutes I broke the smallest bit.

It takes a little getting used to, but after playing around with it for a while I got the hang of it.

I think the mistake I did was using too small a bit. If you cut the layer deep enough, and it still does not seperate from the other layer, go to the next sized bit.

End results



I might weld the two layers in a few places to give it a tad more strength. I will mount it first to see if the door is too flimsy for my taste before I go through the trouble.
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How did you gut your door-img_6716.jpg  

Last edited by miata2fast; 09-29-2011 at 11:29 PM.
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Old 09-30-2011, 12:19 AM   #38
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One thing to add strength/stability back is just skin the inside with a thin sheet of aluminum. They sell pre-painted sheets at most sign shops. I'm probably going to do that on mine. I cut even the braces on the hinge side out. The door is stupid floppy now. Probably need to pin it a different way than the stock latches/hinges at this point.
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Old 09-30-2011, 02:15 PM   #39
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I too drilled out the spot welds when I took mine out, but I just used a regular drill bit. Just make sure its relatively the same size if not a tad bit bigger than the spot weld. Works like a charm as long as you don't go too far and drill all the way through.
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Old 09-30-2011, 04:15 PM   #40
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How hard is it to get the factory door bar out without mangling the outside paint from the grinder heat? Im trying to decide if I should just slot mine to clear the cage or remove it entirely.
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