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rear mount battery

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Old Mar 6, 2005 | 10:18 PM
  #1  
88 350 tpi formula's Avatar
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From: WI,USA
Car: 89 FORMULA 350, 91 Z28 Convertible
Engine: ls1, LB9
Transmission: t56, Auto
Axle/Gears: S60/ 3.73
rear mount battery

what are the regulations for mounting it in the trunk?

I want to take the car to the track but, need to know what is required.


I thought slp had a kit but, I don't see it anymore.

does any one have some pictures of it in our thirdgens?
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Old Mar 6, 2005 | 10:24 PM
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From: New Boston, IL, USA
Car: '90 Formula 350
Engine: 383 SBC
Transmission: ProBuilt S/S 700-R4 & ACT 9" Stall
Axle/Gears: 10 bolt 3.23
From http://www.nhra.com/contacts/tech_faq.html

I have a street car that I occasionally run at the strip. I've relocated the battery to the rear. What else do I need?

Any car with a relocated battery must be equipped with a master electrical cutoff, capable of stopping all electrical functions including ignition (must shut the engine off, as well as fuel pumps, etc.). The switch must be located on the rear of the vehicle, with the "off" position clearly marked. If the switch is of a "push / pull" type, then "push" must be the motion that shuts off the switch, and plastic or "keyed" typed switches are prohibited. Also, the battery must be completely sealed from the driver and/or driver compartment. This means a metal bulkhead must separate the trunk from the driver compartment, or the battery must be located in a sealed, metal box constructed of minimum .024 inch steel or .032 inch aluminum, or in an NHRA accepted plastic box. In cars with a conventional trunk, metal can simply be installed behind the rear seat and under the package tray to effectively seal the battery off from the driver. In a hatchback type vehicle the battery box is usually the easiest solution, since the alternative is to fabricate a bulkhead which seals to the hatch when closed. At present, Moroso is the only company which offers an NHRA accepted plastic battery box, part number 74050.
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Old Mar 6, 2005 | 11:07 PM
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From: Arlington TX
One more thing though. If you use a sealed gell-cell type battery like a Optima then you dont have to have the bulkhead.
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Old Mar 7, 2005 | 12:39 AM
  #4  
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Originally posted by Lason
One more thing though. If you use a sealed gell-cell type battery like a Optima then you dont have to have the bulkhead.
I was pretty sure you had to for ALL batteries in the rear except for dry-cell setups.
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Old Mar 7, 2005 | 12:12 PM
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From: New Boston, IL, USA
Car: '90 Formula 350
Engine: 383 SBC
Transmission: ProBuilt S/S 700-R4 & ACT 9" Stall
Axle/Gears: 10 bolt 3.23
http://www.gmhightechperformance.com...ht_whichweigh/

According to www.bmrfabrication.com :

"Is your battery relocation mount NHRA legal?"

According to the current rulebook, no. Wet cell batteries produce Hydrogen fumes while charging. This is why NHRA mandates a sealed battery box vented to the outside of the vehicle. Dry cell batteries are completely sealed and do not produce any fumes at all. Eventually dry cell batteries will become legal for use inside the vehicle but for now it is up to your local track official.
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