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2005 Mazda RX-8 - Quicky Tech - Project RX-8

Mounting a compact battery in the trunk improves engine bay airflow and reduces curb weight by 26 lbs.

David Pratte
Dec 8, 2011

As we’ve discussed before, rotary engines make a lot of heat, and the RX-8’s Renesis 13B is no exception. As Jim Mederer from Racing Beat explained to us, one of the reasons the Renesis runs hot is poor airflow through the radiator because of how jam-packed the engine bay is. More specifically, the huge OEM battery and battery box that’s mounted tightly behind the radiator on the passenger side is a major airflow impediment. To give you an idea how poor the airflow is here, the RX-8 has an air duct to the bottom of the battery box to help keep the battery cool.

Although kits exist to relocate the battery within the engine bay (mounting it against the firewall where the windshield washer reservoir normally lives), we prefer the trunk-mounting approach using a dry cell (sealed) battery. We like the idea of moving a bit of weight to the rear of the car over the drive wheels, and we also like the fact that the Odyssey PC680 battery we installed is a whoppin’ 26 lbs lighter than the OE battery.

As you can see, the installation is relatively straightforward, and for you DIY types who don’t have a welder, you should still be able to use the West Coast Batteries hold-down box we used (which is specifically designed for the Odyssey PC680 battery) by bolting it to the sheetmetal bracing behind the rear seats.

Source box
Odyssey
PC680 Dry Cell Battery
odysseybattery.com
877-297-3815
West Coast Batteries, Inc.
Aluminum Hold-down Box
westcoastbatteriesinc.com
888-379-2555
SG-Motorsport
Wiring & Welding
sg-motorsport.com
905-463-1483

Sources

West Coast Batteries
Corona, CA 92879
8883792555
www.westcoastbatteriesinc.com
Odyssey Batteries
Reading, PA 19605
8005383627
http://www.odysseybattery.com
SG-Motorsport
905-463-1483
http://www.sg-motorsport.com
By David Pratte
216 Articles

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