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Old 04-03-2015, 04:55 PM
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Coilover selection

I'm looking at a couple different set ups for my C4 Vette front end in my 47 Olds project and would like some opinions on my choices. The 2 that I am looking at are both from Speedway Motors. The first is a Carrera:

Carrera BKR 11-95 Front Coilover Shock Kit 450 Rate, 13.1 Inch Mounted - Speedway Motors, America's Oldest Speed Shop

The second is a QA1:
Carrera BKR 11-95 Front Coilover Shock Kit 450 Rate, 13.1 Inch Mounted - Speedway Motors, America's Oldest Speed Shop

Any opinions on these 2? Which one is preferable, and why?

Thanx, Dennis

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Old 04-03-2015, 11:31 PM
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QA1's are built better than Carerra in anything I've seen but not street related.

I prefer Integra. You will have to call them and they will put a package together for you. Integra has a shock with better beefier valving and oil. That's the part that goes out most often,
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Old 04-04-2015, 05:27 PM
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I run QA1's and love them. Are you sure you want a 450 lb. spring on the front of your car? How did you come up with that number? Might be a tad heavy, and a bit firm on the ride. Unless you're running a big block heavy motor.
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Old 04-04-2015, 05:42 PM
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Quote:
Originally Posted by 1971BB427 View Post
I run QA1's and love them. Are you sure you want a 450 lb. spring on the front of your car? How did you come up with that number? Might be a tad heavy, and a bit firm on the ride. Unless you're running a big block heavy motor.
My Olds weighs in around 3800 lbs. I do the math on the spring rate calculator Spring Rate Calculator « Ridetech – Tech and 450 is what I come up with. Does this sound right to you?
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Old 04-05-2015, 10:25 AM
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I went with 450# springs on the (Aldan) coilover M-II based front clip in my Maverick. It weighs ~ 2850 with an aluminum LS-1 and drives perfectly. The shop who builds the front clip wanted to sell me 550#'s, but after mentioning the aluminum engine, they relented. Seems to me you'd be looking for at least 575#'s for anything but cruises only...

Russ
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Old 04-05-2015, 11:06 AM
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I'd be guessing with total weight, vs. front end weight.
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Old 04-05-2015, 11:45 AM
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Quote:
Originally Posted by 1971BB427 View Post
I'd be guessing with total weight, vs. front end weight.
Not according to that spring rate calculator I posted above. When I plug in my numbers according to the calculator, it comes up with 450lbs. It will break down the front and rear bias for you if you give it the percentages of front to rear weight. I had to guess on that part of about 52% front to 48% rear.
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Old 04-06-2015, 10:16 AM
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Quote:
Originally Posted by Sporty45 View Post
Not according to that spring rate calculator I posted above. When I plug in my numbers according to the calculator, it comes up with 450lbs. It will break down the front and rear bias for you if you give it the percentages of front to rear weight. I had to guess on that part of about 52% front to 48% rear.
That's what I meant when I said I'd have to guess. I'd be guessing what percentage of your weight is front vs. rear.
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Old 04-06-2015, 11:34 AM
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Quote:
Originally Posted by 1971BB427 View Post
That's what I meant when I said I'd have to guess. I'd be guessing what percentage of your weight is front vs. rear.
Ah, OK. So, with the weight I posted does a 450lb spring rate sound right to you?
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