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928M top cross brace

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Old 01-09-2009, 01:00 PM
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belgiumbarry
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Default 928M top cross brace

hehe, sorry Carl, i messed a bit with your cross brace.... perhaps not helping much, but "psychological-mental-and having the means " i tought it would also better connect the front suspension anchor points... ...
greetz
Norbert

Old 01-09-2009, 01:17 PM
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hacker-pschorr
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Queue Jim Bailey explaining the difference between a car with upper & lower control arms versus a mcpherson strut

Looks very cool - something Carl should consider adding to his, or as another option.
Old 01-09-2009, 01:43 PM
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belgiumbarry
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for the ones who want to copy it : tack weld it with the cars weight on the wheels ! Jacking up the car and loosening the bolts , you see the side walls going open for sure some millimeters !
Old 01-09-2009, 03:04 PM
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Jim bailey - 928 International
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Actually Barry when you cut away much of the inner fenders , the triangle to the cowl sections , you greatly weakened the side to side support to the spring towers so your experience might differ from others. That thin folded sheet metal may not be very strong in compression but it is under tension. And they compliment each other when the cross brace is in place. Unibody cars are like Origami birds , flat sheets gain form , structure and strength from the folds. Porsche put that sheet metal "in the way" because the car NEEDED IT , not just to make clutch master cylinders hard to replace.
Old 01-09-2009, 03:06 PM
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RyanPerrella
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Originally Posted by Hacker-Pschorr
Queue Jim Bailey explaining the difference between a car with upper & lower control arms versus a mcpherson strut

Looks very cool - something Carl should consider adding to his, or as another option.
Agreed, looks good

Originally Posted by Jim bailey - 928 International
Actually Barry when you cut away much of the inner fenders , the triangle to the cowl sections , you greatly weakened the side to side support to the spring towers so your experience might differ from others. That thin folded sheet metal may not be very strong in compression but it is under tension. And they compliment each other when the cross brace is in place. Unibody cars are like Origami birds , flat sheets gain form , structure and strength from the folds. Porsche put that sheet metal "in the way" because the car NEEDED IT , not just to make clutch master cylinders hard to replace.
Uh....nice post....very poetic
Old 01-09-2009, 03:07 PM
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Originally Posted by Hacker-Pschorr
Queue Jim Bailey explaining the difference between a car with upper & lower control arms versus a mcpherson strut

Looks very cool - something Carl should consider adding to his, or as another option.
when a authority with 32k posts says " looks very cool" ... i'm happy and my weekend can't go wrong !
greetz
a noob Norbert
Old 01-09-2009, 03:14 PM
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Jim bailey - 928 International
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But half the posts are in " off topic "
Old 01-09-2009, 03:15 PM
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Originally Posted by Jim bailey - 928 International
But half the posts are in " off topic "
I think it's closer to 8:1
Old 01-09-2009, 03:21 PM
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belgiumbarry
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Originally Posted by Hacker-Pschorr
I think it's closer to 8:1
that's a good CR for FI applications ...
Old 01-09-2009, 03:25 PM
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Originally Posted by Jim bailey - 928 International
Actually Barry when you cut away much of the inner fenders , the triangle to the cowl sections , you greatly weakened the side to side support to the spring towers so your experience might differ from others. That thin folded sheet metal may not be very strong in compression but it is under tension. And they compliment each other when the cross brace is in place. Unibody cars are like Origami birds , flat sheets gain form , structure and strength from the folds. Porsche put that sheet metal "in the way" because the car NEEDED IT , not just to make clutch master cylinders hard to replace.
agree 100% Jim, but my idea was to rebuilt that "tension" strenght with bolt in tie rods ... so one can remove them for acces to the master brake and expansion tank , and stil having that rigidness on "tension". ( Triangle setup )
Old 01-09-2009, 05:56 PM
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I have thought about this a lot. This makes more sense to me than the stock brace which bolts to nothing heavy or at a critical point . Even better would be to get the connecting points closer to the upper A arm ties.
Old 01-09-2009, 06:30 PM
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The upper A arm mounts are already triangulated to the engine cross member by the two "brackets" 928 375 063 00 and 928 375 064 00 shown in PET under engine suspension 109-00 .
Old 01-09-2009, 08:37 PM
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Originally Posted by Jim bailey - 928 International
The upper A arm mounts are already triangulated to the engine cross member by the two "brackets" 928 375 063 00 and 928 375 064 00 shown in PET under engine suspension 109-00 .
that is correct , for so far as 1 bolt... of the 2 holding the upper A arm.
Old 01-09-2009, 09:04 PM
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That upper A arm mount has the reinforced channel on the engine side so one nut would stabilize that area pretty well.
Old 01-09-2009, 10:20 PM
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Originally Posted by Jim bailey - 928 International
That upper A arm mount has the reinforced channel on the engine side so one nut would stabilize that area pretty well.
yes, but not in a triangle way... which is the only manner of strenghtness versus weight...


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