I am gonna say less than 20 pounds of material to prevent door sag.

evidence: honda civic car door, 9 square feet of damplifier pro, 62 square feet of raammat, and a neodymium 6" speaker with requisite MDF baffle and minor weight added after causes door sag.

remove 20-25 square feet of raammat and the door no longer sags.

the math tells me approximately 20 pounds is the limit, maybe 18-ish.

your car may be different. A big 'ol honkin american-made truck door can probably take more weight than my wimpy civic door.

 

i probably added about 10-12 lbs per door. no problems yet and i plan to add probably another 3-5lbs to each. i still need more deadening. my plastic door skin keeps buzzing at higher volumes from the mid-bass.

 

It will be car dependent. Some cars are built to hold more weight.

 

Doesn't a car company have a commercial out right now bragging that their doors can hold a 200lb man? Who the hell was that? Toyota?

 

Mercedes

 

x2, it was for the Mercedes C-Class.

My doors have about 7 layers of BXT on the inside, they feel significantly heavier than stock but no visible signs of sagging. My car is built as solidly as anything I've ever seen, and that includes the doors, I'm not worried

 

Most car door hinges are pretty damn tough, for instance, my neighbor is an idiot lol.... but seriously, he owns an eclipse and he can actually sit with his legs through the window opening on his cars door wide open. Now he only weighs 150 probably, but still, that's pretty good. I've never tried on my car, well, because I'm not a douchebag willing to break my hinges, but it can probably be done!

 

keep in mind sagging will not be a visual problem but manifest itself in door-latch function. door makes a "ca-CLICK" sound instead of "CLICK" when it starts to sag.

Wont ever see it.

 

that is really what i'm asking about so thanks for pointing that out. Im thinking that too much weight overtime will cause that lock alignment to get off and therefore screw the door up. And yes I do understand it largely depends on the car, but how will I really know, you know. I don't want to run into probs and then have to take it out cause that could be a *****.

So you guys are saying like 20 lbs is the safe upper limit?

 

Another thing to remember is to keep your door hinges oiled about 4 times a year I put some 3in1 oil all over the pins and Lithium grease on the door latch (the part that clamps on the U bar)Wayne

 

Quick little note here guys;
All materials have a certain amount of fatigue, even metal over time fatigues and the streght properties change. This means that even factory stock doors will sag and give over time. Hence it pays to have you door lubed, (as mentioned); but its also worth while to have them re-hung. Any competent smash repair shop or panel-beater should know how to hang a door. Just about every single car has some allowment for re-adjustment built into the hinges, take advatange of this and have your doors done. It about 1.5hours total work to do 2 doors properly. This is a trick I learnt from my racing-car background. (helps chassis load, ridigity and consistancy).

 

I have had a 250+ pound salesman swing on a VW R32 and tell me it will never sag, that takes some balls and looks like fun.

 

Is that the car in that commercial that they show 2 people sitting on the doors while they are open? Or was it a BMW. Should be both really since they look similar in structural design.

 

hmm I should check mine out too. I have added at least 60lbs.

 

i would also imagine that putting weight closer to the hinges is safer than further away.

 

That is correct.

 

Wow wow now im really worried because im going to put 8 inch midbass drivers in my doors.

i began a new thread with a poll about this so if you could help again I'd be very thankful for that!

 

Wow wow now im really worried because im going to put 8 inch midbass drivers in my doors.

Don't be. Those people saying they put in a few pounds of stuff and had problems had door hinge wear to begin with and perhaps they just didn't know it. Either that or they are driving very poorly designed cars. Door hinges tend wear out and let doors sag over time, particularly 2 door cars, but 4 doors can do it too.

 

I just tested mine. My doors showed no sag whatsover. I lifted them until I could see the chasis lift and there was no play. That's on a 9 year old Honda Accord with two massive doors, 4 layers of dynamat extreme, holding 10 inch woofers from Seas, in custom made 60lb/each doors. Before I had an 8 and a 7 in there. I even forced my doors to close while the gasketing tape and fiberglass adjusted a bit.