Purple slide vs black slide with blue restrictor plate

amusall

Member
What’s faster? We went from running a Black slide with blue plate one week to a purple slide with no plate the next. Dropped a bunch of speed. Went from 5400 rpm to barely over 5000 on a 1/7 mile asphalt oval with the same gear. Added 3 teeth to the rear and didn’t see much change. Is this normal?
 
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