I put a stock 98 SOHC 16 vallve engine in my 97 Geo Metro. This did require changing out the engine wiring harness and PCM. Transmission has 3.79 ring and pinion, suspension dropped one inch, 15" aluminum wheels with Toyo 185/50-15" tires. With the stock TB and the original 97 exhaust, I found the performance better then the 97 8 valve motor but not what I wanted. I took the 98 TB and opened it up to 47 mm. This is the size that Suzuki offers it there race parts catalog. Car gets 45 mpg at 65 mph. Next on the list was to replace the exhaust from the stock manifold back. I went with 2.25" pipe and magnaflow CAT, resonator, and muffler. In retrospect I think I should have gone with 2.0". I have a flange behind the CAT and in front of the resonator. I can use a smaller flange in between the front and rear as a restictor to help keep heat in the CAT. I have a 1.75" restrictor in there now. This new exhaust raised the power band about 1000 rpm. The engine pulls good over 3,000 rpm. At 65mph, 3000 rpm, car now gets 35 mpg. (not happy). But the good news, at 75 mph, 3500 rpm, the car gets 40 mpg. This is the speed I highway cruise at. So next on my list will be one of Mikes cams, a new air intake system before the TB, and get rid of the stock exhaust manifold. Maybe try 4.10 ring and pinion but not sure yet. Just an FYI,,, The car runs on 87 octane with great mpg. I tryed premium and midgrade premium and saw no improvement in mpg. No EGR on these engines. Distributorless ignition, so no way to adjust the timing. But the timing map they use seems to work well. All and all I am happy with this conversion engine.
_________________ Fainya 97 Geo Metro LSI,1.3L-GT-DOHC-16v,4.10 5-speed,A/C,170,000,suspension lowered 1",4 wheel disk brakes,15"alloy wheels with 185/50-15 Toyo's,GT bucket seats,analog oil pressure gauge,cruise control, new paint job. 40 mpg at 65 mph. Good, fast, cheap. You only get two.
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