Some numbers: My current 95 Metro has a factory curb weight of 1880 lbs. The 79 Brat has an official weight of 2175. The Metro and Samurai transmissions share similar gear ratios. The Metro has a final drive ratio of 4.10:1, XFI versions (the ultimate fuel saver version) has a final drive of 3.52:1. The Brat, I believe, is about 3.70:1. The optional Limited slip is a 3.90:1. All in all, a pretty good match for my goals. My two big obstacles are weight reduction and fitting a speedometer drive since the trans has no provision. A simple drive from a motorcycle hub mounted to the back of one of the front hubs (remember, the half shafts will no longer be there) will likely be the solution since the magnetic rotor in the speedo unit doesn't care what is turning it and they really are all the same from my research. The front tire on a street bike has roughly the same diameter as the tires on the brat, so it should be accurate enough. I will be using the Metro speedo unit most likely, since I believe that the fuel injection ECU does get input from a VSS (vehicle speed sensor) in the speedo. I am awaiting my diagrams to confirm this. I am using the simpler harness and more fuel efficient management system from a 91 Metro. Depending on how this version works, the ECU and camshaft from the XFI version may get swapped in later for an increase in fuel efficiency. The XFI stuff will cost HP, but the torque rating is the same. A few enhancements to build a little more torque would get me a power to weight ratio at 2000 lbs. curb equal to my current car at 1880lbs. Three ft/lbs. is all it would take. Still no rocket, but a great little runabout for a man who commonly racks up 120-300 miles in a single day.
Anyway, time for photos.
Edited by raging squirrel, 30 April 2012 - 04:50 PM.