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battery relocated to back, rear passengers cubby

 
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2595
Location: MI

PostPosted: Fri Jun 06, 2014 11:52 am    Post subject: battery relocated to back, rear passengers cubby Reply with quote

well the entire interior is all back, been working on making everything work like it should, pretty much have everything nailed down now so that's good...

I decided not to disgrace my brand new battery box with battery hold down brackets and a battery so my battery is now in the passengers side rear cubby behind the rear wheel..

I was lucky and was able to scavenge the power cable from my e36 bmw, a monster it is, im guessing 0 or 1 gauge, barely fit in the biggest coupler the hardware store had...

I took the power cables from the original battery box off of the firewall and fished them down under the coil around the drivers side of the bell housing, and on the left side of the clutch slave cylinder.. they went another 6-8 inches or so..

I cut the main power wire terminal clamp off and the others that go on its bolt, removed an inchish of insulation from them all and put them in one side of my coupler and screwed them down... (only about half filled that end of the coupler, bmw cable about 2x the size of all the orig Porsche wires combined)

then I got the new cable in the coupler and tight as I could get them...

half of a roll of electrical tape over the coupler then a 4" piece of 2" pvc pipe got a slit cut long ways down it and slipped over the wires and then up over the coupler snugly...

the new cable is zip tied X100 all the way back on the green fuel lines until the torsion bar area, between the round torsion carrier (?) and the sway bar up over the transmission and back down through one of the original grommets for the sunroof drains completely away from the exhaust..

I have both of the drain tubes and vent lines for the battery going out one of those grommets in the bottom of the cubby and the monster 12v hot cable out the other grommet.. grommets went back in but it took some convincing

as far as correctly orientating the battery in that compartment I searched and couldn't find much in the way of inspiration on the forum so I have it stuck in there with a bunch of strategically placed and jammed foam rubber from Yamaha seats and craftsman tractor seats, a bit of the Porsche firewall sound deadening, and a wood taper I made that drops 1.75 inch in 6.5 inch length from front to back..

maybe ill revise that more professionally some time I the future but its definitely serviceable the way it is

I am not going to worry about hold down brackets or a strap because the way I have the ground strap and power cable they have no margin for error, they are tight tight tight... ground strap going from battery to one of those two bolts infront of the spare tire and another strap from that same bolt around the other side of the tire and under the ground crown right there on that back ledge with a bit of an upsized self tapper from my old job installing industrial overhead garage doors because the original one just wasn't up to holding the 50 ish ftlbs of torque I wanted to make it conduct..

I like it, any suggestions?
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ideola  



Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI

PostPosted: Sat Jun 07, 2014 12:03 am    Post subject: Reply with quote

I would suggest proper heat shrink in favor of the electrical tape.

Rather than using the grommets as you describe, you should also consider using proper bulkhead connectors to pass through the sheet metal, like this one:


You should also consider an aftermarket battery hold down box. You don't want that thing tipping over. Technically, the battery cubby should be sealed from the passenger cabin, and the cubby should allow for ventilation to atmosphere.
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Power Tryp  



Joined: 16 Apr 2009
Posts: 435
Location: Calgary, Alberta

PostPosted: Sat Jun 07, 2014 1:43 am    Post subject: Reply with quote

ideola wrote:
You should also consider an aftermarket battery hold down box. You don't want that thing tipping over. Technically, the battery cubby should be sealed from the passenger cabin, and the cubby should allow for ventilation to atmosphere.


That and if you ever plan on taking it to an autocross event (don't know about track days) the SCCA mandates that it be within a non conductive container (aka plastic).
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2595
Location: MI

PostPosted: Sat Jun 07, 2014 2:41 am    Post subject: Reply with quote

I will definitely plan on getting one of those plastic battery containment boxes, I really like that..

I tried getting shrink tubing but they didn't have any big enough, I even enlisted the help of a guy and he couldn't find anything either...

I didn't even know those bulkhead adaptors existed, ill look into that

thanks guys
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Grenadiers  



Joined: 20 Feb 2007
Posts: 3222
Location: Nelson, WI & Prescott, AZ

PostPosted: Sat Jun 07, 2014 2:43 am    Post subject: Reply with quote

I have mine in the back seat passenger side, and in a marine battery box. However, you still should bolt a metal battery base plate to the car, then run the battery hold-downs thru the bottom of the plastic box attaching ends to metal plate.
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2595
Location: MI

PostPosted: Sat Jun 07, 2014 3:53 am    Post subject: Reply with quote

im having a hard time imagining a way to make a plate so I wont have to run bolts out through my rear fender, I would like to come up with something but its a fabrication nightmare..

maybe a lip and bolts through the inside transmission tunnel wall and then legs to the bottom of the fender...

or maybe just triangle shelf like brackets just to that inside wall...

im going to keep it in my mind until the eureka moment comes and then ill do it but in the meantime I am not even the slightest bit nervous that it would/could fail the way it is, definitely serviceable...

hmm definitely liking the triangle bracket idea... here we go again with the grinding and beating and welding...

have I told you guys that I hate bodywork yet? I like things that come apart and go back together, im not so fond of things that make me have to think like an artist...

wait till you guys see my front battery box I made tho, its like perfection, far out surpassed my expectations
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Grenadiers  



Joined: 20 Feb 2007
Posts: 3222
Location: Nelson, WI & Prescott, AZ

PostPosted: Sat Jun 07, 2014 8:37 am    Post subject: Reply with quote

You can go to an auto parts store and buy battery plate/mount.
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'88 924S Track car.
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2595
Location: MI

PostPosted: Sat Jun 07, 2014 9:32 am    Post subject: Reply with quote

Grenadiers wrote:
You can go to an auto parts store and buy battery plate/mount.


really?

nifty...

prolly a plastic box to match too, take the battery with me when I go look...

I don't have any money for that right now tho (getting the turbo done is the priority as far as cash) so it will be a while before I professionalize that battery mount unless I knock something out of some scrap metal I already have..
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