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February 2025
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CC Advertisers
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10-14-2004, 12:26 AM
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CC Member
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Join Date: Sep 2003
Location: Melbourne, Aust,
vic
Cobra Make, Engine: Homebush, Dodge Viper blue, white stripes, black traditional interior 347, AFR heads, Morrison injection, motec, T5, live axle, lead car Bathurst drivers parade 1999, 5.0L Cobra Nationals sprint title 2001
Posts: 87
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Not Ranked
rear coil overs - spring rate
OK, I have a problem. 
Two broken drive shaft uni's, and a broken gear box - bad news
Time to rip it all apart and line up the moving parts. I have a salisbury live axle, currently using 900 lb/in coil springs and Koni adjustables. New coil overs will be verticle.
The coil over springs tend to be in the 250, 350, 450 range ?????
The car weighs about 1050 kg, weight is roughly 50/50, diff is unsprung so sprung weight is about 230 - 240 kg per corner. I want the car to be stiff, for sprint days. 
Anybody know how to calculate the correct spring weight for coil overs 
Snaken
Well will be when I fix the shocks and get a new drive shaft and gearbox. |
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10-14-2004, 02:01 AM
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CC Member
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Join Date: Feb 2002
Location: Alice Springs, central Australia,
NT
Cobra Make, Engine: Classic revival kit (CR3181), gen III engine, T56 6 speed box, AU XR8 lsd diff
Posts: 5,699
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Not Ranked
I dont know how to work it out but my car (still building) is a very similar weight (less unsprung) and my kit supplier recommended 500 lb springs each corner.
__________________
Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.
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10-14-2004, 02:50 PM
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CC Member
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Join Date: Oct 2002
Location: Sydney,
NSW
Cobra Make, Engine: Classic Revival. 6 litre Chev
Posts: 669
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Not Ranked
Snaken,
Talk to King springs. (07) 55396700. They are real helpful.
Phil
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10-14-2004, 04:01 PM
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CC Member
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Join Date: Aug 2003
Location: Hunter valley wine country,
NSW
Cobra Make, Engine: Homebush. Lexus quad cam V8, R154 Supra box. Oh what a feeling.
Posts: 363
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Not Ranked
Snaken
Have you already done the coil over conversion to the Homebush? I am thinking of converting mine.
Brett
__________________
 !!Its good to be stroked but i'd rather be blown!!
Proud member of the Bclub Central Coast chapter
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10-14-2004, 04:31 PM
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CC Member
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Join Date: Sep 2003
Location: Melbourne, Aust,
vic
Cobra Make, Engine: Homebush, Dodge Viper blue, white stripes, black traditional interior 347, AFR heads, Morrison injection, motec, T5, live axle, lead car Bathurst drivers parade 1999, 5.0L Cobra Nationals sprint title 2001
Posts: 87
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Not Ranked
Got the answers
Hi Brett,
I have found the answers.
Have just ordered from Summit Racing, QA1 coil over shocks ( part no. HAL DR4855B ) and 350 lb springs, mounting backets and adjustmnet tool, you can find them all at http://www.qa1.net/
Will pick them up in the US next week .........Ya Hoooo 
Life is good.
Snaken |
10-14-2004, 05:10 PM
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CC Member
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Join Date: Jun 2001
Location: Washington DC Metro (Virginia),
VA
Cobra Make, Engine: Classic Roadsters, Tweaked 351W, T-5Z, CRII Tech Support Team.
Posts: 1,895
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Not Ranked
These spring rates sound about right for logging trucks, but for a Cobra?
Rear springs 180 - 220 #/" (street), 220 - 240 #/" (race).
Fronts are a little stiffer because the control arm acts as a lever on the spring. Load on wheel ~ 600#, load on spring ~ 900#.
350#/" for a small block, 500 #/" for a big block.
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10-14-2004, 05:41 PM
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CC Member
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Join Date: Jan 2001
Location: Sunbury,
VIC
Cobra Make, Engine: Rat Rod Racer, LS1 & T56
Posts: 5,391
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Not Ranked
Hi Pete,
Those QA1 col over look like a nice piece of kit. I've bought their Crome Molly rod ends in the past and they seem to be solid and well made. I was having a look at a pair of their shocks at MacDonald Bros Racing a while back. Billet alloy construction and a fairly solid looking shaft running through them. Bernie is running them on his Cobra.
Did you go for spherical ends or urethane?
Cheers
__________________
Mike Murphy
Melbourne Australia
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10-14-2004, 06:52 PM
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CC Member
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Join Date: Sep 2003
Location: Melbourne, Aust,
vic
Cobra Make, Engine: Homebush, Dodge Viper blue, white stripes, black traditional interior 347, AFR heads, Morrison injection, motec, T5, live axle, lead car Bathurst drivers parade 1999, 5.0L Cobra Nationals sprint title 2001
Posts: 87
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Not Ranked
Hi Mike,
I went for the spherical ends. Better for the track. The big 15 in road tryes I run at 15 to 18 lbs so that softens the ride on the road. 
The 12 shock adjustments will be handy for easy adjustment. Probably need to re arrange the bump stops.
I got a bum steer with the old spring rates, they were more like 250 - 300 than the 900 advised.
The tech people at QA1 were very helpful.
Snaken |
10-14-2004, 09:51 PM
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CC Member
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Join Date: May 2004
Location: Melbourne,
Vic
Cobra Make, Engine: Cobra RMC 377ci Windsor, Harrison Daytona Coupe, Ford XC Coupe.
Posts: 1,588
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Not Ranked
Stiff is my middle name
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10-14-2004, 09:58 PM
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CC Member
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Join Date: Jan 2001
Location: Sunbury,
VIC
Cobra Make, Engine: Rat Rod Racer, LS1 & T56
Posts: 5,391
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Not Ranked
Re: Stiff is my middle name
That's not what that lady from the Goulburn Motor wreckers was saying when Pete and I were out there looking for parts for his broken Drivetrain.
Cheers
__________________
Mike Murphy
Melbourne Australia
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10-14-2004, 11:28 PM
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CC Member
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Join Date: Sep 2003
Location: Melbourne, Aust,
vic
Cobra Make, Engine: Homebush, Dodge Viper blue, white stripes, black traditional interior 347, AFR heads, Morrison injection, motec, T5, live axle, lead car Bathurst drivers parade 1999, 5.0L Cobra Nationals sprint title 2001
Posts: 87
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Not Ranked
I didn't go there, but she was kind enough to return my sunnies.
Very friendly and obliging people in Goulburn.
If I have chosen spring rates that are too hard, the vibration could have pleasant side effects
Snaken |
10-14-2004, 11:32 PM
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CC Member
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Join Date: Oct 2002
Location: Sydney,
NSW
Cobra Make, Engine: Classic Revival. 6 litre Chev
Posts: 669
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Not Ranked
For who?
Phil |
10-16-2004, 03:27 PM
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CC Member
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Join Date: Aug 2003
Location: Melbourne. Australia,
VIC
Cobra Make, Engine: Classic Revival kit. LS1 motor. T56 Tremec 6 speed. 17" replica Halibrand wheels.
Posts: 559
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Not Ranked
I thought when driving a cobra a traveller was a given!!!  |
10-17-2004, 09:56 PM
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CC Member
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Join Date: May 2004
Location: Melbourne,
Vic
Cobra Make, Engine: Cobra RMC 377ci Windsor, Harrison Daytona Coupe, Ford XC Coupe.
Posts: 1,588
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Not Ranked
I did it for the Club
As a new member to the club I thought I should do i t for the team
I was pretty certain that at least one member of the group would
need her help over the weekend (I certainly didn't)
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10-17-2004, 10:06 PM
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CC Member
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Join Date: Jan 2001
Location: Sunbury,
VIC
Cobra Make, Engine: Rat Rod Racer, LS1 & T56
Posts: 5,391
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Not Ranked
Jeez, So there is some truth to the rumor, I was just fishing.
Good on you for taking one for the team. That's what Cobra club membership is all about. 
Cheers
__________________
Mike Murphy
Melbourne Australia
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