View single post by Jensenman
 Posted: 03-30-2007 06:16 pm
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Jensenman

 

Joined: 04-14-2005
Location: Columbia, South Carolina USA
Posts: 156
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 I have a JH5 and I also have a rotary powered Triumph Spitfire which uses Miata and RX7 drivetrain and suspension components including a home built IRS. (Look for an article on the Spitfire in an upcoming issue of Grassroots Motorsports.)

 The short answer to the Miata subframe question: no it won't fit under a J-H. That's not to say a custom IRS couldn't be built; in fact that's on my list of projects. No it's not simple, particularly since one of my criteria is that it be 'bolt in' with no cutting of the J-H.

The 300ZX, second gen RX7, third gen RX7, and 240 SX are all similar in track width to a J-H but again major chopping would be required to get their subframes under the car. Those are 'compromise' IRS's with weird toe changes for rear wheel steering so you probably wouldn't be happy with the results.  The Miata's geometry is a much better design.