Leaf Spring Choices

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69XR7RestoMod
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Leaf Spring Choices

#1

Post by 69XR7RestoMod » 08 Mar 2018, 06:27

I made the mistake of putting 5 leaf springs on my car.

I'm looking for a something that's comfortable and will provide improved handling and keep the stock ride height.

So far I've seen that Eaton has a 120lb "improved" handling 4 leaf, global west has a 130lb 4 leaf and there are other vendors offering 4.5 leaf springs in the 165 range that are supposed to help prevent wheel hop.

What do you guys think about spring rates and 4 vs 4.5 leaf springs?

Thanks,
1969 XR-7 Restomod 408ci 483HP/523TQ, FiTech, TKO-600

canted 393
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Re: Leaf Spring Choices

#2

Post by canted 393 » 08 Mar 2018, 06:32

I like these for the wt savings when not using stock springs https://www.calvertracing.com/index.php.

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1969XR7Vert
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Re: Leaf Spring Choices

#3

Post by 1969XR7Vert » 08 Mar 2018, 09:40

If you are looking for comfort and wheel hop prevention together, a different spring alone (of any type) is not going to get you there in my opinion. Buy a comp handling spring from whomever (Espo is a good choice for not having to spend the bank) and then you'll need a traction-aid. I run Espo springs and Cal-Trac's. The Cal-Trac's do bang a bit under certain conditions even though I have the pins that contact the leafs covered in clear vinyl tubing.
Isabel, the realization of a seven year long dream:



Canted--Texan on the351cforum: "One of my most impressive attributes is that.......a lot of people don't like me.....or the horse I rode in on"

69XR7RestoMod
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Re: Leaf Spring Choices

#4

Post by 69XR7RestoMod » 08 Mar 2018, 10:13

1969XR7Vert wrote:
08 Mar 2018, 09:40
If you are looking for comfort and wheel hop prevention together, a different spring alone (of any type) is not going to get you there in my opinion. Buy a comp handling spring from whomever (Espo is a good choice for not having to spend the bank) and then you'll need a traction-aid. I run Espo springs and Cal-Trac's. The Cal-Trac's do bang a bit under certain conditions even though I have the pins that contact the leafs covered in clear vinyl tubing.
Do you know what the spring rate is on your spring? Is this similar to the Eaton "Enhanced" spring?

Thanks,
1969 XR-7 Restomod 408ci 483HP/523TQ, FiTech, TKO-600

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1969XR7Vert
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Re: Leaf Spring Choices

#5

Post by 1969XR7Vert » 08 Mar 2018, 17:28

69XR7RestoMod wrote:
08 Mar 2018, 10:13
1969XR7Vert wrote:
08 Mar 2018, 09:40
If you are looking for comfort and wheel hop prevention together, a different spring alone (of any type) is not going to get you there in my opinion. Buy a comp handling spring from whomever (Espo is a good choice for not having to spend the bank) and then you'll need a traction-aid. I run Espo springs and Cal-Trac's. The Cal-Trac's do bang a bit under certain conditions even though I have the pins that contact the leafs covered in clear vinyl tubing.
Do you know what the spring rate is on your spring? Is this similar to the Eaton "Enhanced" spring?

Thanks,
Sorry, no I do not. You can call Espo and speak to them, that would be my suggestion. My recollection is that I bought their spring that is built to the OEM "competition handling" spec's.
Isabel, the realization of a seven year long dream:



Canted--Texan on the351cforum: "One of my most impressive attributes is that.......a lot of people don't like me.....or the horse I rode in on"

69XR7RestoMod
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Re: Leaf Spring Choices

#6

Post by 69XR7RestoMod » 10 Mar 2018, 18:21

So I’ve done some research, for the 69 coupe the standard spring is 85 lbs, the “enhanced” handling spring is 120 lbs and all the 428 cars had 135 lbs springs.

So I’m trying to decide between the 120 and the 135. I think the higher spring rate for the 428 cars was meant to help deal with the extra horsepower as opposed to weight as the 351 and 390 cars both use the 120 spring.

I have almost 500 hp so it seems like the 135 would be the best choice.
1969 XR-7 Restomod 408ci 483HP/523TQ, FiTech, TKO-600

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cj750
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Re: Leaf Spring Choices

#7

Post by cj750 » 10 Mar 2018, 23:49

1969XR7Vert wrote:
08 Mar 2018, 09:40
If you are looking for comfort and wheel hop prevention together, a different spring alone (of any type) is not going to get you there in my opinion. Buy a comp handling spring from whomever (Espo is a good choice for not having to spend the bank) and then you'll need a traction-aid. I run Espo springs and Cal-Trac's. The Cal-Trac's do bang a bit under certain conditions even though I have the pins that contact the leafs covered in clear vinyl tubing.
I adjust mine so that there's pressure on the springs all the time. Doesn't seem to hurt anything, and they're perfectly silent. I don't even know they're there until I hit the gas and the car moves out straight with no wheelhop or drama.
Every post I make is made with a request for corrections. I'm here to learn.

1969 Cougar Eliminator 351 4V, yellow
1970 Cougar Eliminator 428SCJ, black

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1969XR7Vert
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Re: Leaf Spring Choices

#8

Post by 1969XR7Vert » 23 Mar 2018, 14:36

cj750 wrote:
10 Mar 2018, 23:49
1969XR7Vert wrote:
08 Mar 2018, 09:40
If you are looking for comfort and wheel hop prevention together, a different spring alone (of any type) is not going to get you there in my opinion. Buy a comp handling spring from whomever (Espo is a good choice for not having to spend the bank) and then you'll need a traction-aid. I run Espo springs and Cal-Trac's. The Cal-Trac's do bang a bit under certain conditions even though I have the pins that contact the leafs covered in clear vinyl tubing.
I adjust mine so that there's pressure on the springs all the time. Doesn't seem to hurt anything, and they're perfectly silent. I don't even know they're there until I hit the gas and the car moves out straight with no wheelhop or drama.
I'll have to try that! Thanks Jay.
Isabel, the realization of a seven year long dream:



Canted--Texan on the351cforum: "One of my most impressive attributes is that.......a lot of people don't like me.....or the horse I rode in on"

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R Code
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Re: Leaf Spring Choices

#9

Post by R Code » 23 Mar 2018, 18:06

cj750 wrote:
10 Mar 2018, 23:49
...the car moves out straight with no wheelhop or drama.
The above describes how my R Code vert launches, and I don't run any traction aids. I used Eaton Spring for the rear leaves. They asked if the car had A/C (it does), and offered a heavier duty version (as if you had the battery mounted in the trunk), which I ordered. The car rides great, and launches just fine.
- Chris

1967 Std 4 speed conversion
1969 XR-7 "R Code" Convertible

69XR7RestoMod
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Re: Leaf Spring Choices

#10

Post by 69XR7RestoMod » 24 Mar 2018, 04:31

That's great to hear. I ordered almost that exact spring from ESPO. I'll let you know how it rides when I get them in.

UPS was supposed to deliver Friday and I was planning on installing today, but late yesterday I got a notification that they had been rescheduled to Monday.... :(
1969 XR-7 Restomod 408ci 483HP/523TQ, FiTech, TKO-600

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