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battery relocation question

Deep cycle means you can discharge it more without killing it.  They are used for things like trolling motors on boats that do a lot of work between charges.  You don't need that.  You want gell cell.

As for mounting position, don't just worry about countering your weight.  These cars have over 60% of there weight on the front end.  Counter that!  Put the batt as far back as you can get it.  The whole "centered over the rear axle" thing is a mystery to me as well.  Sounds nice, but from an engineering standpoint there is nothing magical about that area.  

The downside of placing it further back is that the further from the CG you place things, the harder it is to rotate the car in a turn.  If, for example, your car's weight distribution starts out at 65% front and 35% rear, you are 15% away from the ideal of 50/50 (which is itself debateably ideal, but go with it).  Basic numbers I ran a while back (so they may have lost accuracy with time :) ), suggested that putting the batt behind the rear seat would make you something like 62/37, and putting it in the rear of the trunk did something like 60 or 61/whatever.  Keep in mind that a difference of "1" there is huge because we are only "15" away from the ideal.  

So there is an incentive to move it far back.

As for the increased rotational inertia, that batt., when in the rear of the trunk, is no further from the rear axle than it was from the front axle.  The inertia gain is probably small compared to the inertia of the whole car, which is dominated by the engine hanging out in front of the front axle.  The increase in rotational inertia (really it's the first moment of inertia we are talking about, to be tech-ish), would hurt you in transitions, but then the improved weight distribution would help you in transitions as well as the rest of the turns.  Prolly close either way, and either way is better than stock, but getting the battery further back than the rear seat is prolly a very good idea.

HTH.

Brian


>----- Original Message -----
>From: "Rhett Farnum" <rocco_crossing@hotmail.com>
>To: <scirocco-l@scirocco.org>
>Sent: Monday, February 24, 2003 2:17 PM
>Subject: Re: battery relocation question
>
>
>>
>> So, is a dry cell the same as a deep cycle? Or are they different and what
>> is the best to run in our cars.
>>
>> ALSO, I am thinking of putting my bettery where the back passenger seat
>> would be inorder to counter my wieght and balance the car better while
>> autoXing. What would be the best way to attach the box and where to run
>the
>> vent?
>>
>>
>> Peace Out,
>> Rhett
>> Rocco_crossing
>> '83 Rocco (autocross ready, 20 days till season opener)
>> '92 Olds Cutlass Ciera (DD)
>>
>>
>>
>>
>>
>> >From: "Josh20V" <mkii@nycap.rr.com>
>> >To: <scirocco-l@scirocco.org>
>> >Subject: Re: battery relocation question
>> >Date: Mon, 24 Feb 2003 16:35:06 -0500
>> >
>> >just as a side note, this is the one Im going with.
>> >
>> >http://www.jshouseofeuro.com/images/stinger.jpg
>> >
>> >Its a Stinger brand dry cell.
>> >
>> >24.9 lbs / 5" H x 6-9/16" W x 6-7/8" D
>> >
>> >Josh Able
>> >www.JsHouseOfEuro.com
>> >BrandNew Eurobumpers in stock
>> >check out the forums!
>> >----- Original Message -----
>> >From: "Vince Royer" <vince@performancecarstereo.com>
>> >To: "Joe Doty" <Joe.Doty@lcnetwork.com>; "Ryan H" <rhock99@epix.net>;
>> ><scirocco-l@scirocco.org>
>> >Sent: Friday, February 14, 2003 7:21 PM
>> >Subject: RE: battery relocation question
>> >
>> >
>> > > Just a note on all this battery stuff.  Here's my take:
>> > >
>> > > I wanted to get the weight of the battery right between the 2 wheels
>and
>> >as
>> > > low as possible to lower the center of gravity.  In the future I think
>I
>> > > will cut out the well and make my own, but I'll wait for the stereo
>work
>> >to
>> > > start that.  For now I dropped the battery box down into the wheel
>well
>> >as
>> > > far forward as possible and scewed it down.
>> > >
>> > > I'm using 1/0 phoenix gold power cable, through a 350 amp circuit
>> >breaker.
>> > > I have a distribution block up front sending 4 AWG to the Starter & 4
>> >AWG
>> >to
>> > > the Alternator.  I used the battery I had, it has a vent hose which I
>> >routed
>> > > out the bottom.
>> > >
>> > > I also have another neat trick.  I recently had my car stolen and
>really
>> > > don't want it happening again. If a theif cuts your battery cable,
>alarm
>> > > goes bye-bye.  So I ran a second 8 gauge cable from the battery
>directly
>> > > into the main power input from the fusebox.  That way I was able to
>> > > eleminate the old corroded wire coming through the firewall.  Suddenly
>> >all
>> > > my electronic devices performed better - like all the bulbs/wipers/fan
>> >etc.
>> > > I guess I freed up some electrons, but the biggest thing I gained was
>> >the
>> > > security.  Now there is no way of disabling the alarm from outside the
>> >car.
>> > >
>> > > Cheers!
>> > >
>> > > Vince
>> > >
>> > >
>> > >
>> > > -----Original Message-----
>> > > From: scirocco-l-admin@scirocco.org
>> > > [mailto:scirocco-l-admin@scirocco.org]On Behalf Of Joe Doty
>> > > Sent: Friday, February 14, 2003 2:29 PM
>> > > To: Ryan H; scirocco-l@scirocco.org
>> > > Subject: RE: battery relocation question
>> > >
>> > >
>> > > I used a bench vise.  Worked great!
>> > >
>> > > Joe Doty
>> > > IT/Development
>> > > joe@lcnetwork.com
>> > >
>> > > > -----Original Message-----
>> > > > From: Ryan H [mailto:rhock99@epix.net]
>> > > > Sent: Friday, February 14, 2003 1:30 PM
>> > > > To: scirocco-l@scirocco.org
>> > > > Subject: Re: battery relocation question
>> > > >
>> > > > All this battery talk brings about an interesting question of mine:
>I
>> > > > bought the cheapo Summit kit, what kinda tool should I use to crimp
>> > > the
>> > > > end connectors (battery terminal connections are pre-crimped
>already)?
>> > > I
>> > > > don't think my trusty wire cutter/crimper will work for 2 gauge
>wire.
>> > > ;)
>> > > >
>> > > >
>> > > > _______________________________________________
>> > > > Scirocco-l mailing list
>> > > > Scirocco-l@scirocco.org
>> > > > http://neubayern.net/mailman/listinfo/scirocco-l
>> > >
>> > > _______________________________________________
>> > > Scirocco-l mailing list
>> > > Scirocco-l@scirocco.org
>> > > http://neubayern.net/mailman/listinfo/scirocco-l
>> > >
>> > >
>> > > _______________________________________________
>> > > Scirocco-l mailing list
>> > > Scirocco-l@scirocco.org
>> > > http://neubayern.net/mailman/listinfo/scirocco-l
>> > >
>> >
>> >
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>>
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