07-09 Mazdaspeed 3 trunk mount batteries

Discussion in 'Mazdaspeed 3 General Discussion' started by Raider, Sep 13, 2017.

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  1. Raider

    Raider Administraider Administrator Platinum Member

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    OK, I've looked, no decent how to or kits for us that I could find. Looking for an easy and safe kit for the trunk. Anyone got ideas?

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    Raider, via a mobile device, Sep 13, 2017
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  2. jsmith

    jsmith Gold Member

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    Why did HTP lose interest in making battery relocation boxes? The made one for the 6 and then just stopped?
     
  3. Mauro_Penguin

    Mauro_Penguin Punk in Drublic Silver Member

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    Not enough interest. Of the few that were, a bunch of people bitched about the price. It was well worth the price though IMO.
     
    Mauro_Penguin, via a mobile device, Sep 13, 2017
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  4. Raider

    Raider Administraider Administrator Platinum Member

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    I saw their kit, looked pretty nice! Had wondered if it could be modified for ms3...
     
    Raider, via a mobile device, Sep 14, 2017
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  5. Mauro_Penguin

    Mauro_Penguin Punk in Drublic Silver Member

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    The ms6 one couldn't. The reason being is that the ms6 has an enclosed trunk, so no need for an enclosure or battery box. Since we have an open hatch, the concern was having to build a box for it. I dont remember what precaution they took for venting possible fumes though.
     
    Mauro_Penguin, via a mobile device, Sep 14, 2017
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  6. jsmith

    jsmith Gold Member

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    Did I hear group development/buy?
     
    jsmith, via a mobile device, Sep 14, 2017
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  7. Code Monkey

    Code Monkey Gold Member

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    The HTP kit for the MS6 is very nice, but bear in mind that the cables weigh close to 7 lbs. If you are moving from a 35-lbs battery to a 15-lbs battery, you will only save about 13 lbs, less if you need an enclosed battery box. So from a weight-saving perspective it is not that great. If you need to free some space in the engine bay it is totally worth it of course.
     
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  8. Everton992000

    Everton992000 Silver Member

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    I have a trunk mount battery in my second gen. It was custom fabbed by a friend for $80. Where my battery was in the bay he put a plate that holds my ECU, fan controller, and BCS.

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    Everton992000, via a mobile device, Sep 14, 2017
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  9. 5doorsoffury

    5doorsoffury Greenie Member

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    I ended up grabbing regular moroso battery box and a zero gage amp kit. Its vented out below the jack storage. Notched out my rear carpet and done. Mounted the ecu to the inside opposite side of the stock batt box. I cut the box and lid to allow my intake to fit then put a piece of sheetmetal with L brackets mounted to the batt box to cover up the opening. The box hides all the wireing and hoses out of sight.
     
    5doorsoffury, via a mobile device, Sep 14, 2017
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  10. Raider

    Raider Administraider Administrator Platinum Member

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    I'm just trying to free up space. Biggest concerns is safety. It's gotta be secure in a wreck because my kids will be on the other side. If I can't be 100% sure of their safety, I'll probably just stay how I have it now. Jbr 3.5" intake and CS battery box are a tight fit, but it's better than having existing wiring damaged like it did a year ago.
     
    Raider, via a mobile device, Sep 15, 2017
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  11. 5doorsoffury

    5doorsoffury Greenie Member

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    Well in a wreck anything is possible. In a sealed trunk like the 6 it can be ok but in a hatch its kinda sketchy. The fumes can be really dangerous if the vent tube or box seal fails. Sure you can get a sealed battery but in a crash the battery hold down can twist or get mangled and short the terminals out then the battery goes into melt down mode back there. The only super safe way would be to mount the battery upside down in a battery box outside under the hatch.
     
  12. Mauro_Penguin

    Mauro_Penguin Punk in Drublic Silver Member

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    You could have a fender or bumper mount like Chrysler did in some cars. It would make changing the battery a PITA, but it would free up space.
     
    Mauro_Penguin, via a mobile device, Sep 16, 2017
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  13. Raider

    Raider Administraider Administrator Platinum Member

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    My mom has that in her Concorde. What a pain in the dick. A 51R may just be needed.
     
    Raider, via a mobile device, Sep 17, 2017
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