Quote:
Originally Posted by 911pcars
What do you mean when you say the Tip starter is "stronger" than the Hi-Torque or stock starter? If it's a direct-drive starter, in order to crank the engine faster or with more torque, the battery must provide more electrical current. No free lunch here.
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I don't think I agree...
I'm not sure if they improved electrical motor efficiency, changed the windings and increased the current draw or improved mechanical efficiency.
Certainly a motor is not a motor- both efficiency and stall current, etc do vary a fair bit, and it wouldn't surprise me if the newer motor provided more stall torque and/ or higher efficiency, meaning more output power for a given input. However I suspect the bigger difference is higher mechanical efficiency through friction reduction. With my motor both the "Hi-Torque" and stock starters would struggle to fire the car, probably partly because the starting torque was forcing the pinion shaft back and creating addition friction, (mostly in the bearings I assume). Eliminating the unsupported shaft knocks the load on the bearings way down, reducing mechanical loss.
Whatever the reason the tip starter fires the car significantly more quickly and easily. Of course unless you have a GT3 motor I'm not sure you care- I never had any trouble firing my 993 motors with normal starters.