91 305 TBI to 385ci LT1 swap now tach inaccurate
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From: Randleman,NC,USA
Car: 91 Camaro RS Convertible
Engine: 385ci LT1 cnc ported heads big cam
Transmission: 4L60E automatic
Axle/Gears: 3.42 Zexel posi 7.5" rear
91 305 TBI to 385ci LT1 swap now tach inaccurate
I swapped my TBI system out for a highly modified LT1 and the motor runs strong but my tach is now off by 50%. When idling my laptop says I am running 650-700rpms and motor sounds like its running that but my tach is showing 1400-1500rpms and if I hold a steady 4000rpms my laptop says I am running 2000 rpms and at 7000 rpms on the tach I am running 3500 rpms. What can I do to make my tach a little more usable. Right now its just a useless needle moving around on the dash.
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