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1991-1994 SR20 redlines at 7,500 rpm later models redline at 7,100.
As to why, moving parts experience friction. Friction eats power. Friction increases exponentially with rpm. Reducing the rpm at which a specific power can be achieved reduces power lost to friction and increases fuel efficiency.
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Bruce in Houston
'94 Nissan Sentra SE-R w/ $tuff, converting to ITA
'98 Suzuki Bandit 1200S w/ $tuff
'02 Dodge Dakota SLT 4-dr tow beast, stock!
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