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Old 08-10-2001, 12:38 AM   #1
25psi
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Default Battery relocation to the trunk

Hey guys!

Who done it?
Gimme all the info you got PLEASE!!!! I wish to do it!

Thanks.

Eugene
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Old 08-10-2001, 01:42 AM   #2
Imprezer
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I did it in my WRX. Ask me questions.
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Old 08-10-2001, 03:44 AM   #3
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Did you use a sealed battery box?
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Old 08-10-2001, 03:45 AM   #4
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Where in the trunk did you put it, how did you mount it and where did you run the battery cables?
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Old 08-10-2001, 04:23 AM   #5
Streetman
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Might want to consider what the battery cables weigh. How much weight are you actually transferring after factoring that in? I remember this argument quite a while back, and it was determined that this did just about nothing. Try a dry cell battery instead.
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Old 08-10-2001, 10:57 AM   #6
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You only need to run the positive line to the front of the car (negitive can be ground to somewhere in the trunk) I would think 4 gauge wire would be more than adequate for running the positive line. And 15 feet of 4 guage wire can't weigh more than a pound or so. I don't think wire weight is a big factor to look at.
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Old 08-10-2001, 11:04 AM   #7
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The battery must weigh like 40 pounds. I HIGHLY doubt that one car length of cable will "outweigh" the advantage of moving the battery out of the engine bay. Sorry for that hideous pun.
Now that the battery is in the trunk how are you gonna rearrange the bits in the engine for optimal heat dissipation and airflow?
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Old 08-10-2001, 11:18 AM   #8
2.5 RRRRS
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Why not just get a super light battery and keep it in the front. The battery was relocated to the back on my MG, but I put it back up front due to the excessive weight of the cable, etc. It didn't help weight distribution at all on that particular car.
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Old 08-10-2001, 11:30 AM   #9
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Default Something else to consider

Weight isn't the only reason to relocate the battery. Think safety.
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Old 08-10-2001, 11:52 AM   #10
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I have had my car on scales and was playing around with moving items. Relocating the battery to the far rear pasanger side in the trunk shifted 2% to the rear of the car. It _does_ do something.

Yes this was with out adding the wire, and if you want to get picky about weight balance, and I thing you should, run the wire on the pasanger side to help balance the biggest dead weight of any car out. The driver.
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Old 08-10-2001, 12:10 PM   #11
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What are the handling advantages of biasing weight backwards in an AWD car?

Is it advantageous to bias weight rearwards, at the expense of increased polar moment?

These are not rhetorical questions, just curious if anybody knows.

cheers
mbs
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Old 08-10-2001, 12:14 PM   #12
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It's an advantage to even out the weight distribution between front and rear in any car for more neutral and predictable handling.

nizz
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Old 08-10-2001, 12:25 PM   #13
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Have you looked into a Dyna-Batt or a Holley Annihilator battery? You could realize overall weight reduction. A smaller battery might (not sure if there's enough room) also mount behind the driver's side foglight. This would lower it and also free up engine bay room. You could also mount it in the spare tire tub in the trunk (lower).
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Old 08-10-2001, 12:30 PM   #14
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Quote:
Originally posted by 2.5 RRRRS
Why not just get a super light battery and keep it in the front.
Well, I think that begs the question: Why not get a super light battery and put it in the trunk?
Another thing to think about is that anybody with an amp in their trunk already has the wire going from one end to the other. Of course, if you have 20-30 pounds of stereo equipment in your trunk you might not be obsessed with lightness...
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Old 08-10-2001, 12:40 PM   #15
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I've heard that said before, and it "sounds logical" but I've never heard a good explanation.

For example, don't the front tires have more to do than the back tires in an AWD car, ie, steering and acceleration/braking, as opposed to just acceleration/braking for the rear tires? "Sounds logical".

cheers
mbs
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Old 08-10-2001, 12:50 PM   #16
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Let go of the all wheel drive concept for a minute, because all cars (well, all cars that are meant to turn) benefit from equal weight distribution. Too much weight in the front, and the front tires will not have enough leverage to rotate that mass. Too much weight in the back, and the front tires will not have enough traction.
In a car wearing the same rubber on all four tires, a 50/50 weight distribution will provide each of the tires with the same grip (ignoring acceleration and aerodynamic forces).
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Old 08-10-2001, 01:04 PM   #17
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WOW! Nice discussion going here!

Ok, here we go.

I want it in the trunk to clean up engine compartment. I have WAAAY too many wires and cables around battery. + Yes a little bit of better weight distribution. (Ideal weight distribution I belive is 51/49 Rear/Front)

I already have nice 4G power cable runing to the end from battery. It is used for my amp. So, I was thinking about reusing it to run power from the back to front to power all the stuff in the engine compartment.

Here is the pic. All in black is what I have now. all in green is what i am thinking.

Picture is here. (Stupid free sute would not allow me to display it)

Now for the questions:

Can I do it the way I designed it?
I know summit sells Battery Relocation Kit, does it include posts that need to be mounted up-front?
How do you mount those posts?

Thanks dudes.

Eugene

Last edited by 25psi; 08-10-2001 at 01:34 PM.
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Old 08-10-2001, 01:18 PM   #18
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I would look at bigger than 4 guage wire, and make sure it is fused well. The biggest draw on the battery is during starting. Make sure your wire can handle that load without much loss, or it could be hard to start. If you try using a non sealed batter, make sure it is vented to the out side of the car.
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Old 08-10-2001, 01:25 PM   #19
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Biger than 4G????? 2? It'll be like a hand width thick!!!!

Also fuse I have is 150A one. Really heavy duty fuse. I belive it should do fine to protect my amp, no?

I do plan to go to a seled type battery in the near future but not right away, they are quote expencive.

Eugene
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Old 08-10-2001, 01:34 PM   #20
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Default Re: Something else to consider

Quote:
Originally posted by M_Annequin
Weight isn't the only reason to relocate the battery. Think safety.
How would it be safer?

Mike
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Old 08-10-2001, 06:22 PM   #21
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Default hmmm

I'm not sure how it would be safer either? It definitely does have a weight transfer effect-I cant believe the discussion of cable weight. Even if cable weight were significant its spread down the length of the car and the significant weight(the battery) is transferred to the rear. Its a good project. And I think 4 gauge would be sufficient(check the temperature of the line after starting to be sure) as most resistance is at dirty terminals.
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Old 08-10-2001, 06:44 PM   #22
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looking at a couple of wire charts, assuming a 50 amp load when starting, and a cable run of 15 feet (closest guess), 4awg wire should be good enough. Make sure you fuse the batter at both ends, one within 18" of the battery and one before the cable goes through the firewall. This will prevent a short from killing your car.

Again, I would like to stress that if you are not using a sealed battery, make sure it is vented to the outside of the car. Wet, non-sealed batteries produce hydrogen and some other gases as a byproduct. If they are trapped in a trunk, or passanger compartment, there is a possiblity of an explosion. Most race organizations would require your battery to be vent anyway.
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Old 08-10-2001, 07:33 PM   #23
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Default Something else to ponder...

Why not just drive in reverse

But seriously, I own a Miata which comes standard with the battery in the boot/trunk and the non-sealed battery issue is a serious one. Even with venting I believe the gas it produces will corrode the metal around it. More technical info on this topic can be found on miata.net's forum.

Jon
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Old 08-20-2001, 12:19 AM   #24
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My old MR2 had the battery mounted down by the steering rack...not possible in the WRX. If I get a small, light battery for my WRX I would like to mount it behind the driver's side foglamp underneath the stock location. This would free up engine room. It would mount the battery lower in the car. Wiring would be nearly as short as stock. There is already a grommet right in front of the battery for wires to go into the front fender. I took out the foglight and looked around to find lots of unused room in the fender.
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