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Last Post 20 Jul 2017 01:01 PM by  Der Wankel
RX7 w/ Engine Swap Classication
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Never7
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Posts:1


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02 Jul 2017 11:31 AM
    Hello everyone,

    I'm new to this forum, but have been autocrossing as a hobby for years now. Before I started the hobby, I had an engine swap for my 2nd-gen RX-7 FC (old engine expired). This engine was also a 13B, but sourced out of a 3rd-gen RX-7 FD. Aside from the ECU, the engine was almost a direct drop-in with new engine mounts to match my car. The rest of the car is essentially full of bolt-on upgrades, with a full stock interior aside from a newer steering (i.e. not a full-prep race car). Tires being used is TW200. Due to my own interpretation of the rules, I simply ran Street Modified for years without much hassle or concern since my local club is very lax on classification. But, I was recently questioned as if I was classing myself incorrectly.

    After reading various recent interpretations of the SCCA class rules, it seems like my RX7 may be classified as CSP instead. The car pre-swap was in CS, as it was the Turbo2 trim. The drivetrain rules seem to have possible different definitions as evident from the different interpretations I have encountered. So, what do some of you think about how I should have my car classed?

    Thank you very in advance!
    loudes13
    Basic Member
    Basic Member
    Posts:209


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    02 Jul 2017 11:12 PM
    SSM
    Grintch
    Basic Member
    Basic Member
    Posts:259


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    06 Jul 2017 02:52 PM

    Right. Add OR CHANGE a turbo, and it's SMx, XP, or EM.

    2nd Gen RX-7 and 3rd Gen RX-7s are not only on different classification lines, they are in completely different classes.  So arguing that the engine change was an SP legal update doesn't hold water.

    Never7
    New Member
    New Member
    Posts:1


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    10 Jul 2017 11:47 PM
    Thank you both for your input! After speaking with more local autocrossers, it seems like SM will be the class I'll run in.

    SSM would be correct if the 2nd-gen FC came only as a 2-seater like the FD, but instead it was actually able to be optioned to be 2+2 from the factory, as oddly as that might sound.

    As nutty as SM class can get with mods, I'm understanding EM and XP classes are the truly free-for-all ones, like the many LSx-swapped cars. Since my car had a "simple" 13B swap, it was still within the same manufacturer's line of tech. Plus, I'm not running any sort of fuel cell or full race-prep mods, so that was why it was concluded that I should stay in SM.
    Der Wankel
    New Member
    New Member
    Posts:36


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    20 Jul 2017 01:01 PM
    FC RX-7 was in SSM until just recently, hence the confusion.

    Per February 2016 Fastrack-

    Street Modified
    #18364 SM eligibility inquiry
    Per the SMAC, the 1986-1991 Mazda RX7 2+2 meets the requirements for the SM class and is thus allowed to
    compete in Street Modified.
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