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10-23-2009, 03:13 PM
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CC Member
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Join Date: Jun 2004
Location: Leicestershire,
UK
Cobra Make, Engine: Kirkham #523, 427 S/O
Posts: 1,137
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Not Ranked
Front Spring Rates
What are the recommended front coil-over spring rates for a Contemporary with an aluminium 427?
Thank you.
Paul
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10-23-2009, 05:17 PM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Manchester,
NH
Cobra Make, Engine: AK1085 (302 Street), HTM111 (427 Comp), CSX2375R (289 Comp) and COB5999 (427 S/C)
Posts: 18,997
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Not Ranked
Paul
Depends upon the use.
Typical driving with a height adjustable unit should be 250lb to 275lb rate. For hard racing maybe more with 300max. Keep in mind an ally FE is probably comparable to SB cast so the 275 should suffice for all occasions.
I prefer lower rate as the bite is better, personal preference....  |
10-23-2009, 11:35 PM
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CC Member
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Join Date: Jun 2004
Location: Leicestershire,
UK
Cobra Make, Engine: Kirkham #523, 427 S/O
Posts: 1,137
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Not Ranked
Thanks Jeff,
what about the rears, what should they be?
Can you also tell me what length they should all be please? The shockers have adjustable spring platforms.
BTW, the car will only be used on the roads.
Paul
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10-24-2009, 05:58 PM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Manchester,
NH
Cobra Make, Engine: AK1085 (302 Street), HTM111 (427 Comp), CSX2375R (289 Comp) and COB5999 (427 S/C)
Posts: 18,997
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Not Ranked
Paul
Keep in mind this is a 2300lb car!
Original Jaguar (4000lb car) rate is 250lb each at 10" length, I think on adjustable style they are 9". That however depends upon the shock being used. I used 250lb rate with great success and the squat was perfect. Removes the CCX perky butox as well. Stance was nice but hard cornering and a bump may cause a rub which is not unusual for these cars with the larger tires. Most of the time it was never an issue.
ERA and CCX recomend 350lb rates but for me that was too stiff. 250lb was perfect, remember that is with two per side unlike your new KMS! Good luck!
Last edited by 1985 CCX; 10-24-2009 at 06:08 PM..
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10-25-2009, 09:42 AM
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CC Member
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Join Date: Jun 2004
Location: Leicestershire,
UK
Cobra Make, Engine: Kirkham #523, 427 S/O
Posts: 1,137
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Not Ranked
Thanks again Jeff,
So can I just confirm, 275lb springs on the front and 250lb springs on the rear?
While we're on suspension, do you have any recommended alignment settings?
BTW, your car looks great. 
Best regards,
Paul |
10-26-2009, 08:24 AM
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CC Member
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Join Date: Jun 2004
Location: Leicestershire,
UK
Cobra Make, Engine: Kirkham #523, 427 S/O
Posts: 1,137
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Not Ranked
Hi Jeff,
I've just read elsewhere that you've sold your car. 
Get a Kirkham 289, you know you want to. 
Paul |
10-26-2009, 09:01 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,001
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Not Ranked
Quote:
Originally Posted by FatBoy
Hi Jeff,
I've just read elsewhere that you've sold your car.
Get a Kirkham 289, you know you want to. |
He wants an ERA. He says he wants quality plus a detailed manual. |
10-26-2009, 10:28 AM
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CC Member
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Join Date: Jun 2004
Location: Leicestershire,
UK
Cobra Make, Engine: Kirkham #523, 427 S/O
Posts: 1,137
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Not Ranked
:lol: :lol: :lol:
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