Erc Trim Control - Mercury MerCruiser Axius 350 MAG User Manual

Section 2 - Getting to Know Your Power Package

ERC Trim Control

Excessive trim can cause serious injury or death at high speeds. Use caution when trimming the sterndrive, and never trim out
beyond the gimbal ring support flanges while the boat is underway or at engine speeds above 1200 RPM.
Some ERC's will have a single button for trimming both sterndrives simultaneously or may have separate buttons for each
sterndrive unit.
For best performance trim the sterndrive unit so that the boat bottom is at a 3‑5° angle to the water.
Trimming the sterndrive unit up (out) can:
• Generally increase top speed
• Increase clearance over submerged objects or a shallow bottom
• Cause the boat to accelerate and plane off slower
• In excess, cause boat porpoising (bouncing) or propeller ventilation
• Cause engine overheating, if trimmed up (out) to a point where any cooling water intake holes are above the water line
Trimming the sterndrive unit down(in) can:
• Causes the boat to accelerate and plane off quicker
• Generally improve the ride in choppy water
• In most cases, reduce boat speed
• In excess, can cause bow steering (unexpected turning) by lowering the bow of the boat so that it plows the waterline while
on plane.
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90-864197084 NOVEMBER 2008