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Old 10-07-2009, 08:28 PM   #1 (permalink)
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Default rx7 rear end swap

im currious if anyone has details on whats involved in doing an rx7 rear end swap. i want to get rid of my 1.6 one and the rx7's are far more easily available and stronger than the 1.8 miata ones. im pretty sure that you need to make a new front mount for it but other than that i really have very little info, wondering if anyone could help me out. thanks
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Old 10-11-2009, 07:20 PM   #2 (permalink)
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Default Re: rx7 rear end swap

I was at a track day not too long ago and there was a 1993 Miata there that had a complete FD3S power train and chassis underpinnings swapped into it. The guy who build the car is named Kris Eidnes. The car was built for http://compositeenvisions.com/ If you could get a hold of him somehow, he could answer all your questions. You could try contacting the site admin. The car is off-the-wall sick.

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Old 10-12-2009, 02:26 AM   #3 (permalink)
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Default Re: rx7 rear end swap

the NA rx7 will bolt right in, but will not bolt to the PPF, and will need to be modified to fit, or another way found to keep it in place
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Old 10-12-2009, 08:49 AM   #4 (permalink)
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Default Re: rx7 rear end swap

Parts:
94-05 1.8 Miata open assembly
86-88 NON-TURBO Rx7 clutch-type lsd
94-95 Miata stub shafts
or 96-05 Miata axles (no stubs needed)
94-05 Miata driveshaft
Miata Ring and Pinion


Procedure:
Open the 1.8 miata housing & pull out the open diff. Bolt the ring gear from the miata diff to the RX7 LSD. Drop it in, set the backlash and reassemble the housing. Swap/install as normal.
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Old 10-12-2009, 11:27 PM   #5 (permalink)
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Default Re: rx7 rear end swap

im trying to see if there is a way to put a whole rx7 diff in a miata. i have a 1.6 rear end and want to beef it up and have been seeing that rx7 diffs are alot cheaper and easier to find than the 1.8 miata one (and alot of limited slips stock). i was under the impression that i could remove the diff from a 1.6 miata, with a few mods put in an rx7 one (what year im not sure), bolt up the axles and it would work. am i compleatly wrong?
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Old 10-13-2009, 08:37 AM   #6 (permalink)
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Default Re: rx7 rear end swap

You still need the pinion housing from a miata. The Rx7 rear has no means to bolt it to the PPF, plus the nose is about 12" longer and would require a shorter drive shaft.

You can however use the aluminum section if you fit miata mounts into it.

So if you want to do this, you need to buy a 1.8L open pumpkin and a 86-87 non-turbo rx7 LSD assembly. swapping the LSD into the miata pinion housing and setting the backlash, then bolting that back on the rx7 aluminum section.

like so:






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Old 10-13-2009, 09:18 AM   #7 (permalink)
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Default Re: rx7 rear end swap

wow brain, you just made it sound a LOT simpler than the review i read when i googled it. haha

the google review confused the hell out of me, and now i feel stupid for being confused after reading yours
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Old 10-13-2009, 09:41 AM   #8 (permalink)
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Default Re: rx7 rear end swap

There's nothing to it.

You just need a driveshaft, axles and differential from a 1.8L miata. If you want the Rx7 LSD, source it and swap it into the miata carrier using all the miata parts like the ring gear and axles (you can use the rx7 stubshafts with miata axles) and crap. The backlash must get set, then you bolt it all up and install.
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Old 10-13-2009, 09:44 AM   #9 (permalink)
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Default Re: rx7 rear end swap

I have still yet to drill the 3 holes into my floorpan for the harness. I just got the time to buy some titanium drillbits yesterday, but it looked like it was going to rain.

I'm going to have a collection of parts to put on my car when I get the time for it, and I think I might have to add an LSD to it since I will have my car up in the air.
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Old 10-13-2009, 10:35 AM   #10 (permalink)
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Default Re: rx7 rear end swap

Titanium drill bits to drill through thin sheet metal? My tiny pecker could punch a hole through the floorboards.
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Old 10-13-2009, 10:38 AM   #11 (permalink)
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Default Re: rx7 rear end swap

How hard is setting the backlash? A fancy gauge and a steady hand?
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Old 10-13-2009, 10:39 AM   #12 (permalink)
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Default Re: rx7 rear end swap

Quote:
Originally Posted by Braineack View Post
Titanium drill bits to drill through thin sheet metal? My tiny pecker could punch a hole through the floorboards.
you must be good at cock pushups.

I have a weak battery powered drill at my apartment, so I wanted the sharpest/strongest drill bits I could get so I dont have to drive an hour back to the crib for my good drill.

+ I learned my lesson last time after drilling for the rollbar. Better to have good drill bits.
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Old 10-13-2009, 11:10 AM   #13 (permalink)
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Default Re: rx7 rear end swap

I'm only a level 10 wizard, if I were a level 15 I could just do it with my mind from here....
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Old 10-13-2009, 11:16 AM   #14 (permalink)
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Default Re: rx7 rear end swap

Quote:
Originally Posted by Braineack View Post
I'm only a level 10 wizard, if I were a level 15 I could just do it with my mind from here....
im gonna PM you about your MS skills so i dont take this thread off topic more than it already is
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Old 02-07-2012, 02:32 PM   #15 (permalink)
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Default Re: rx7 rear end swap

Quote:
Originally Posted by Braineack View Post







I just did this to my car last night....
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Old 02-07-2012, 07:21 PM   #16 (permalink)
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Default Re: rx7 rear end swap

I wish I had a pic of the RX7 install that my son did on his 90..

Complete RX7 limited slip..pumpkin and housing, axles and shortened driveshaft.

The rear came with a bracket that mounts to the RX7 snout on the drivers side and wraps around to the PPF side like a big 'C'...he shortened the PPF and bolted the bracket to the PPF ..had to drill new holes in the PPF for that...

this is a fresh turbo build...ground up..car is running and driving, but not properly tuned at this time...so it sits while he is at school...at least until spring break.

Might be something in here..

http://www.flickr.com/photos/46719123@N04/sets/
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Old 02-09-2012, 10:14 AM   #17 (permalink)
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Default Re: rx7 rear end swap

sounds like a TII install.
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