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Old 07-10-2019, 07:28 PM   #1 (permalink)
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Suspension seat movement

Ok, I have a question for those of you running suspension seats.

How much "suspension " movement do you get out of the seats?

I have PRP Podium elite's. Where I was planning to mount the batteries was behind and somewhat below (call it half way) the seats. Well, as luck would have it, due to the latch on the battery box I need to raise them up 4"-5". That will put the bottom of the batteries even with the bottom of the seats.

In that position, the batteries don't touch or push into the back of the seats. But there's maybe 1/4" between them. They're behind the metal (vertical) parts of the seat frame itself.

Problem is, I have no idea what is too close. I can literally punch the seat as hard as I can from the front and I can't feel the battery, but that's a pretty retarded test I know.

Anyone have any thoughts?

Pictures:

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And a really shitty side view.

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Old 07-10-2019, 07:49 PM   #2 (permalink)
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I like the punching of the seat idea. That made me laugh for some reason. That looks ok to me. I often have stuff crammed into the back of my suspension seat and I never feel it.
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Old 07-10-2019, 08:23 PM   #3 (permalink)
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I would say it's only going to be a problem when you really don't want it to be a problem. i would move the batteries.
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Old 07-11-2019, 06:58 AM   #4 (permalink)
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best battery boxes EVER.

no way i put a battery somewhere i have to pull stuff out to get to them.
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Old 07-11-2019, 07:31 AM   #5 (permalink)
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Your fine as far as the seat goes. Most of the movement I get out of mine is the bottom of the seat. I would hope the back of the seat wouldn't move at all.

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Old 07-11-2019, 11:02 AM   #6 (permalink)
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Quote:
Originally Posted by 69DieselLover View Post
I would say it's only going to be a problem when you really don't want it to be a problem. i would move the batteries.
sounds about right

something soft, no big deal. something hard? another 1/2" of room would be sweat. i'd at least put something softer or rubbery along the lip just to keep the hard hit from being so hard, if possible
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Old 07-11-2019, 03:00 PM   #7 (permalink)
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I'm going to investigate raising/lowering/flipping the latch. They fit perfect sitting on the floor, just can't operate the latch at the moment.
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Old 07-12-2019, 04:39 AM   #8 (permalink)
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Old 07-12-2019, 05:48 AM   #9 (permalink)
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WTF is this magic? Are you saying you think the 'suspension' part of the seat would somehow make the metal in the back of the seat flex backwards? Since when does a suspension seat have a flexible metal back?

If the back of the seat moves upon impact the seat belts will either break your upper or lower back. so best not to put seat belts on at all.

And only engineers hide batteries. Are you a fawking engineer?
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Old 07-12-2019, 05:53 AM   #10 (permalink)
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Looking at the pictures you should lower the batteries to the floor and use a different battery box.

never raise the COG because you picked the wrong parts. Cool boxes but not the best option for you with the room you have.


Maybe cut that lower spreader out. Do your really need that anyway. When I saw that tube I was wondering if it was a foot rest of something. I can't see enough of your junk to tell if there is other cross support or not. it appears like its unneeded.
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Old 07-12-2019, 06:26 AM   #11 (permalink)
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I'm right on the edge of Meh and "I don't like it"

The webbing and lacing inside the seat is pretty stiff and should be fine. I don't think the punch test really works although it's funny to think of. I see this being an issue if you are climbing something, lose traction and come crashing back down and land on the bumper or rear diff on a rock or something. A 5 mph crash in reverse, unrestrained (seat belt hold you back, not forward) is a 6 G impact. So if you weigh 180 lbs that's over a half ton spread across the seat back. If you street drive this thing and get rear ended at 30, you'll probably break your spine.

Calc:
https://www.omnicalculator.com/physics/car-crash-force
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Old 07-12-2019, 07:51 AM   #12 (permalink)
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Quote:
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WTF is this magic? Are you saying you think the 'suspension' part of the seat would somehow make the metal in the back of the seat flex backwards? Since when does a suspension seat have a flexible metal back?

If the back of the seat moves upon impact the seat belts will either break your upper or lower back. so best not to put seat belts on at all.

And only engineers hide batteries. Are you a fawking engineer?
I only say i'd look at moving slightly because the metal box corner is below the metal 'lumbar' seat brace, looks to be between the bottom of the seat back and the lumbar. might just be the angle of the photo. Webbing doesn't have much give, but with a hit hard enough to slide your back into the lumbar, it would suck to also then hit your ass on the metal box corner
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Old 07-12-2019, 08:23 AM   #13 (permalink)
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Quote:
Originally Posted by Pokeman View Post
WTF is this magic? Are you saying you think the 'suspension' part of the seat would somehow make the metal in the back of the seat flex backwards? Since when does a suspension seat have a flexible metal back?

If the back of the seat moves upon impact the seat belts will either break your upper or lower back. so best not to put seat belts on at all.

And only engineers hide batteries. Are you a fawking engineer?

I understand the metal frame of the seat doesn't move, the suspension allows some movement (of my fat ass) within the metal frame. Where the batteries are sitting in the pics, is between the two center vertical posts of the seat frame. They are behind the vertical posts, but not by much as you can see.

This isn't from PRP but shows what's inside:



This is from PRP:

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So by design the seats allow the load (me) to move around a bit. Can't be much or, as you noted, harnesses would be useless.


Quote:
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Looking at the pictures you should lower the batteries to the floor and use a different battery box.

never raise the COG because you picked the wrong parts. Cool boxes but not the best option for you with the room you have.


Maybe cut that lower spreader out. Do your really need that anyway. When I saw that tube I was wondering if it was a foot rest of something. I can't see enough of your junk to tell if there is other cross support or not. it appears like its unneeded.

Can't remove it. It's kind of busy. It's all tied into the seat mounts and trans tunnel.


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Old 07-12-2019, 08:26 AM   #14 (permalink)
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Can't remove it. It's kind of busy. It's all tied into the seat mounts and trans tunnel.


Attachment 2937054
You can move it. Cap it at the tunnel on each side and run tun straight up to your node in the middle. No need for it to be a spreader. Let the tunnel/seat hang off that node
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Old 07-12-2019, 08:34 AM   #15 (permalink)
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You can move it. Cap it at the tunnel on each side and run tun straight up to your node in the middle. No need for it to be a spreader. Let the tunnel/seat hang off that node
I'm going to try modifying the battery boxes first. Even removing the latch and replacing it with a bolt would get them to sit on the floor.
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Old 07-12-2019, 10:42 AM   #16 (permalink)
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That would be the smart move, drop it down to the floor. Considering all the other fab you've done, now hard is it to make/modify the battery mounts ? I know it's a low percentage event, but I wouldn't want a hard corner in my lower back in a hard rear collision. We'd probably be surprised to see just how much movement there is. You could always call the Mfg. , but I'm pretty sure what they'd say !
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Old 07-12-2019, 11:00 AM   #17 (permalink)
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Quote:
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I'm going to try modifying the battery boxes first. Even removing the latch and replacing it with a bolt would get them to sit on the floor.
there is nowhere else you can put them?
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Old 07-12-2019, 11:34 AM   #18 (permalink)
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there is nowhere else you can put them?
There is. Right behind the rear seat (it's a 4dr JK). I was trying to avoid going there because they'd sit directly over the rear axle and I already have a 32gal fuel cell directly behind the axle. That's a lot of weight in the rear, so if I can mount them more midship and lower, I want to do that.

I'm no racer, but I am trying to at least consider where I'm putting weight.
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Old 07-12-2019, 11:43 AM   #19 (permalink)
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weight behind the axle is your friend, it will help it ride better plus i would assume allow easier access to them.
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Old 07-12-2019, 04:33 PM   #20 (permalink)
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weight behind the axle is your friend, it will help it ride better plus i would assume allow easier access to them.
ditto.
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Old 07-12-2019, 10:45 PM   #21 (permalink)
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New home for the batteries. Don't have to fuck with the boxes. Better protected from anyone climbing in or out. Spine is safe for now.


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Old 07-14-2019, 09:20 PM   #22 (permalink)
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for those reading this thread, armada battery boxes are the bees knees. no tools needed to take the battery out.
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Old 07-14-2019, 11:23 PM   #23 (permalink)
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Seems like those batteries can be tilted. The box does not HAVE to be flat to the floor. I learned the hard way about not putting things (bottle jack) UNDER the seat.

Looks like a good move anyway.
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Old 07-15-2019, 06:31 AM   #24 (permalink)
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found it
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Old 07-15-2019, 07:00 PM   #25 (permalink)
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New home for the batteries. Don't have to fuck with the boxes. Better protected from anyone climbing in or out. Spine is safe for now.


Attachment 2937188
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