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1987 Buick Grand National

 
1987 Buick Grand National
1987 Buick Grand National
Due to the GN's stock bottom end, John tried to keep both the tune and boost fairly conservative. At WOT, the air/fuel ratio hovered from 10.75:1 to 12.00:1, averaging out to the 11.5 target. The intake air temps stayed a consistent 80 to 81 degrees on the dyno. Spark was kept at 24 degrees at WOT, and the injectors never surpassed 62 percent duty cycle. View Related Article
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