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I am installing a roll up 4 section (8'w x 7'h) garage door. This door uses a torsion spring above the door opening. This spring is 28" in length, vs. the 25" spring on a similar door (same size and weight). The 25" spring requires 7 full turns to obtain the proper balance to easily open and close the door. Would the 28" spring require more full turns to obtain the same end result. With the 28" spring set at 7 full turns, the door will raise a little over 1/2 of the total height needed. The springs are the same in all dimensions, except for length. A picture of the type of spring is enclosed. Thanks, David.
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