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Originally Posted by 95metro
They were lighter, maybe even more underpowered, but were the gears identical? Maybe look at putting the old Firefly tranny in the blackfly? I thought I read somewhere that there were some slight transmission variations besides final drive.
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Lighter, less rotating mass (12 in wheels & tires); also the pre-86 cars EPA ratings were higher, even though they used the same test method (they introduced a "fudge factor" and changed the ratings even though the cars didn't change).
As for the gear ratios, everything I've learned about those trannies, I learned at TeamSwift. If I recall rightly, all the 3-cyl cars had the same ratios, but used different final drives depending on: XFi/12 in rims/13 in rims/convertable (heavier).
Some bedtime reading...
http://www.teamswift.net/viewtopic.php?t=14845
http://www.teamswift.net/viewtopic.php?p=163307
http://www.teamswift.net/viewtopic.php?t=23748