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morghen

Joined: 21 Jan 2005 Posts: 9095 Location: Romania
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Posted: Thu Apr 24, 2008 4:01 am Post subject: Rear suspension trouble |
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Ok...so..new weird thing.
i took the car for a 4 wheel alignment today and was very surpised to see that the rear arms could bearly get the toe into specs.
The issue is toe. there was a lot of negative toe. -35 to -40 to be more precise.
However the wheels looked perfect on the body. I had to hammer the arms to get the toe to 0. The issue is that normaly the nominal values have a +- where the nominal value for the toe in my case is unidimensional. I mean i cant get the toe to the positive side...ok maby 0.05 but not more. BUT...i can get a lot of negative toe. What do you guys think? what could cause this?
Could it be that the torsion bar carriers are different from the 924 to the 944 turbo? and the mountings of the rear arms are differently placed? _________________ Supercharger and EFI kits
https://www.the924.com |
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924RACR

Joined: 29 Jul 2001 Posts: 9071 Location: Royal Oak, MI, USA
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Posted: Thu Apr 24, 2008 8:39 am Post subject: |
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Toe in or toe out??
Toe in is good. Toe out is bad (in the back of the car). _________________ Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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Paul

Joined: 02 Nov 2002 Posts: 9491 Location: Southeast Wisconsin
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Posted: Thu Apr 24, 2008 9:02 am Post subject: |
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Did you lower the car? _________________ White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy. |
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Rasta Monsta

Joined: 12 Jul 2006 Posts: 11733 Location: PacNW
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Posted: Thu Apr 24, 2008 9:03 am Post subject: |
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| 924RACR wrote: | | Toe out is bad (in the back of the car). |
Got something against 360s? _________________ Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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morghen

Joined: 21 Jan 2005 Posts: 9095 Location: Romania
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Posted: Thu Apr 24, 2008 3:26 pm Post subject: |
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http://www.blueriverfleet.com/align/alignm4.gif
i had lots of toe out.So the wheels were "steering" outwards.
The car has been lowerd using the torsion bars.
Now it sits at 0°.00¨ plus-minus 0°.05¨ but i had to move the wheels forward about 1cm. It was fairly hard to achieve these measurements(i had to hammer the arms into their position)...as i mentioned this is the limit...the wheels cannot go any further so i could not get toe in even if i wanted. What do you guys think? there is no sign of damage in the area... _________________ Supercharger and EFI kits
https://www.the924.com |
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Mike924

Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK
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Posted: Thu Apr 24, 2008 4:57 pm Post subject: |
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What sort of spring plates do you have, Morghen?
From what I've learned, the overall distance from the end of the torsion bar to the wheel hub is what affects the toe angle the most... _________________ 1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org |
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morghen

Joined: 21 Jan 2005 Posts: 9095 Location: Romania
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Posted: Thu Apr 24, 2008 5:20 pm Post subject: |
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| Mike924 wrote: | What sort of spring plates do you have, Morghen?
From what I've learned, the overall distance from the end of the torsion bar to the wheel hub is what affects the toe angle the most... |
yes, exactly thats what i said...i had to move the wheels 1cm to the front of the car, making the distance from the carrier to the hubs smaller.
The spring plates also come from a late edition 944. the 924 ones cant be used with alu arms. _________________ Supercharger and EFI kits
https://www.the924.com |
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morghen

Joined: 21 Jan 2005 Posts: 9095 Location: Romania
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Posted: Fri Apr 25, 2008 3:31 pm Post subject: |
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yea...anyway...now that the car has 0 rear toe it tracks like its glued on the road...there is so much grip if the road is good...it never felt like that. I drove home from the mecanic ON BOOST so it was constant adrenaline for a few minutes  _________________ Supercharger and EFI kits
https://www.the924.com |
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