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FC Setup - torsen diff, battery, etc.

Old 03-11-08, 08:55 PM
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FC Setup - torsen diff, battery, etc.

I drive a FC turbo II in SCCA SoloII, competing in BSP, and I have a couple of things I need to install.

First off, I have the torsen diff out of an FD lying around. What is generally considered to be the best fluid to use for this differential? I'm sure a lot of people use the general 75W90 RP, Redline, etc. However, I heard a lot of good stuff from S2000 owners about the Lubrication Engineers 607 straight 90w fluid. Anyone have any experience with this in their diff, and where did you manage to find it?

Another thing I have is an Odyssey PC680 battery. I'm sure there are people using the same, if not similar batteries in their cars. Which tie-down/bracket is preferable for this type of battery? I'm not looking to relocate it quite yet, so I'll need something that bolts into the stock location.
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Old 03-11-08, 10:05 PM
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I'm using the redline fluid with my Torsen. Try checking in the 3rd gen section and on miata.net for more suggestions.

I think most people would fab their own bracket for the battery, it won't be hard, that's some pretty basic stuff there.
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Old 03-12-08, 12:13 AM
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i just bought a generic bracket at kragen then drilled two holes in the bottom of my stock box and its all good...
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Old 03-12-08, 12:34 AM
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From what I've read, you should use a straight 90. However, I think most people including me use Redline 75W90.
http://www.redlineoil.com/products_g...bCategoryID=15

If you attend SFR events, you can this or other quality oils at a good discount (roughly mail order prices without shipping charges) from Benny at:
http://lubrify.com/
Email him for a price and he can bring it the next event.

I've also read about road racers claiming great things about swepco oil, but I've never tried it.
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Old 03-12-08, 09:36 AM
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From the Torsen site they say that basically the thicker the lube, the less locking you get (but go too thin and you'll likely have problems with wear). Apparently if you pack it with grease it approximates an open diff.
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Old 03-12-08, 07:02 PM
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I managed to locate some of the LE607 fluid, so that's taken care of.

Now, the issue is the battery. I'm still undecided as to whether or not I want to relocate it. It'd definitely clean up the engine bay a bit, and get weight off of that corner. Might just have to fabricate my own bracket.

Anyone have experience relocating the battery to the storage bins, or somewhere else in the rear hatch area?
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Old 03-12-08, 07:53 PM
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Originally Posted by Bunchies View Post
Anyone have experience relocating the battery to the storage bins, or somewhere else in the rear hatch area?
I plan to mount mine where the spare wheel once lived. Seems like a logical place for an FC.
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Old 03-12-08, 08:48 PM
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Originally Posted by Bunchies View Post
I managed to locate some of the LE607 fluid, so that's taken care of.

Now, the issue is the battery. I'm still undecided as to whether or not I want to relocate it. It'd definitely clean up the engine bay a bit, and get weight off of that corner. Might just have to fabricate my own bracket.

Anyone have experience relocating the battery to the storage bins, or somewhere else in the rear hatch area?
I got a battery box for optima red's if anyone's interested.
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Old 03-13-08, 03:22 AM
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I know that the battery cables are part of the main wiring harness in the FC. What's necessary to relocate/extend this wiring through the firewall and into the passenger area? My electrical experience is extremely limited.
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Old 03-13-08, 04:47 AM
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Originally Posted by S2-13BT View Post
I plan to mount mine where the spare wheel once lived. Seems like a logical place for an FC.
Not a good idea...

Think about what happens on a rear end collision...



-Ted
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Old 03-15-08, 02:14 AM
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Originally Posted by RETed View Post
Not a good idea...

Think about what happens on a rear end collision...



-Ted
True, but is it much different to having it mounted in the boot of a sedan? People would normally mount it over to one side.

I guess behind the passenger seat would be a good place then if you want to try to ensure nothing unfortunate happens in the event of a collision.
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Old 03-15-08, 07:40 AM
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Originally Posted by S2-13BT View Post
True, but is it much different to having it mounted in the boot of a sedan? People would normally mount it over to one side.
Two words: "crumple zone"

I guess behind the passenger seat would be a good place then if you want to try to ensure nothing unfortunate happens in the event of a collision.
That's where mine sits - in a marine box bolted down securely behind the passenger seat.

Good luck,

-blll
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