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wheel nut tightening torque - is it really 470 ft/lbs?

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Old 10-01-2005, 01:40 PM   #1
garrett376
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Question wheel nut tightening torque - is it really 470 ft/lbs?

Hi guys/gals,
I was at Discount Tire getting some tires for my 911, and saw on a sheet that the Carrera GT's wheel torque value was listed at 470 ft/lbs. Is this correct? I'm just curious, and I figured you guys should know!
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Old 10-01-2005, 02:21 PM   #2
themarsman
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No it isn't 470 ftlb.

You are supposed to tighten wheel nut to 550Nm (407ftlb) + 25 Nm (19 ftlb).
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Old 10-01-2005, 07:09 PM   #3
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Here one way to look at it...most of us have 5 nuts at about 96ft/lbs or 480 ft/lbs...so one nut with 407ft/lbs seems about right?
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Old 10-02-2005, 12:07 PM   #4
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The dealerships have a special "torque multiplying wrench" for doing this,
otherwise you would need a very long breaker bar!
mk
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Old 10-02-2005, 01:37 PM   #5
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That's cool, thanks for the info, guys!
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Old 10-02-2005, 02:19 PM   #6
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I was actually told by the mechanic, because the locking tabs weren't clicked out on one of the collars, that you use the torque multiplier and with that you can use a regular torque wrench. Dunno how much truthful that is but I am sure the manual would cover that.
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Old 10-11-2005, 10:04 PM   #7
Steve N.
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Iceman: My CGT has four nuts; other street Porsches have 20, but I only have two - last time I checked. Same as most guys.

Sorry - couldn't help it. Others have shown proper restraint.
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Old 10-13-2005, 01:30 AM   #8
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The "torque multiplier":

A = (Ta - Tw) * L / Tw

A = Length of adapter needed, in inches
Ta = Required torque at working end, 407 ft/lbs.
Tw = Torque wrench reading from its scale, 250 ft/lbs
L = Length of torque wrench, from handle center to drive center, 18"

using my large torque wrench I'd need an 11.3" extension :

(407 - 250) * 18 / 250 = 11.3"
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Old 10-13-2005, 01:30 AM
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