Rate, nope but they sit and act about the same as stock v8 springs with 1 coil cut for fox bodies... Pac makes em, doubt they will publicly post the rates, but they size them buy overall weight of the car. I had old eibach drags springs in mine when I replaced them with those, had a few cars with cut stock one's since.

 

More importantly, they work! I have them on my Coupe. Like rednotch, I replaced some old Moroso springs and saw (felt) an instant difference. That was on the street and not the track though.

 

I had stock springs with 1/2 coil cut and yea they are almost the exact same size as the Team Z ones except look at how the Team Z spring has a bit more coils towards the bottom of the coil (well, technically its the top cause the smaller coil goes around the control arm).

In my experience, the Team Z springs really showed that the springs I had in there were compensating for the low quality control arms I am currently using. Prior to installation I would experience no wheel hop, and after installing these, I now get some wheel hop just giving it the beans on street tires. My conjecture is that the stock cut coils were really soft, and that helped mitigate any wheel hop in the form of softening up the hit on a hard launch. Now that I am getting wheel hop, I can assume that these Team Z springs are a bit more stiff, and are helping put the power down a little more. It seems these springs have accentuated the worse parts of my suspension setup, which isn't a problem that can't be solved in the form of a better control arm setup.

 

I had stock springs with 1/2 coil cut and yea they are almost the exact same size as the Team Z ones except look at how the Team Z spring has a bit more coils towards the bottom of the coil (well, technically its the top cause the smaller coil goes around the control arm).
View attachment 1097261

In my experience, the Team Z springs really showed that the springs I had in there were compensating for the low quality control arms I am currently using. Prior to installation I would experience no wheel hop, and after installing these, I now get some wheel hop just giving it the beans on street tires. My conjecture is that the stock cut coils were really soft, and that helped mitigate any wheel hop in the form of softening up the hit on a hard launch. Now that I am getting wheel hop, I can assume that these Team Z springs are a bit more stiff, and are helping put the power down a little more. It seems these springs have accentuated the worse parts of my suspension setup, which isn't a problem that can't be solved in the form of a better control arm setup.

I would think stiffer springs would help control wheel hop vs a lighter rate... Had car with old 4cyl springs that hated radials and like to do that. Had some poly bushing boxed style arms on it when got it, was a tad better with v8 springs but would do it occasionally .. Was fine on bias ply, but damn that car did not like radial tires. Was just low hp bolt on car though.

 

Saw this today on FB

 

View attachment 1097550
Saw this today on FB

Thanks, if memory serves that's in the typical lowering spring rate range.

 

A, frpp b or c, same rear spring used in both would be interesting to see plotted like that, think they rate those at 1" drop 200-300 inch lb rates, think I got a set laying around to lol.

 

Can't go back and look on SBFTech anymore, but I recall Dave Zimmerman telling me when I had H&R race springs on the back of my 90LX something like that was a really good spring to run in my application. He now sells his own line of rear drag springs, but I can't find info on the H&R race springs to see how they compare. Jack Hidley had at one time posted a link detailing the different spring rates for various H&R springs, but now I can't find it. I want to say the race were rated in the 260-280 range, which would be similar to what TeamZ offers.

 

Super Dave I thought lower spring rate was better. Like 80 to 100#s. So I would think Team Z would be close. If anyone has access to a press I would send them my spring compressor gauge to run a test on their TeamZ spring.

 

I love my team z drag springs.

 

Not to hijack it but I’ll hijack it. I have a set for sale In central Illinois. Like new.

 

Looks like they've been on sale for a bit now...

79-93 Mustang Stock Location Rear Drag Springs - Order Today

Learn more about our 79-93 Mustang Stock Location Rear Drag Springs, and order your rear suspension parts from Team Z Motorsports today.

www.teamzmotorsports.net

 

I put a set of these in my 90LX, it did raise the backend up about an inch as compared to the H&R race springs I had in it. Can definitely tell the spring rates is higher when driving it, will see how this works out next time at the track.

 

Does the ride seem rougher when hitting sharp edged cracks and seams?

 

Before I installed these Team Z springs I measured them, they had 7 coils, vs. the cut factory and MM race springs that had 6 coils. The MM springs coils were .566, the stock springs were .572, and the Team Z were .575.

 

Interesting numbers. I was under the car the other day and noticed the top couple of coils on the Team Z springs appear to be dead coils. They are completely collapsed. That only leaves maybe 6 active coils. I'm wondering if this is to set the ride height only.

 

I found the word document I had with the different spring rates in case the info is useful to someone down the road.

H&R Race
1.0-1.75" front & .75-1.25" rear drop
Spring rates:
Front 750-850
Rear 260-280

H&R Super Sport
1.5" front & 1.0" rear drop
Spring rates:
Front 600-720
Rear 205-250

H&R Sport
1.25" front & 1.0" rear drop
Spring rates:
Front 490-575
Rear 205-250

'78-'83 Fairmont (excluding wagon) use 8597 or CC821.
'78-'83 Fairmont Wagons use 8599 or CC823.
'85 Mustang GT uses CC827, no other springs listed.
CC are Cargo Coils, which are variable rate springs
CC827- 9.5" installed | 691lb load | 174lb/in | 13.80" free height
CC823- 10.25" install | 808lb load | 340lb/in | 12.63" free
CC821- 09.25" install | 804lb load | 275lb/in | 12.29" free
8597 - 9.5" installed | 726lb load | 224lb/in | 12.75" free height
8599 - 9.5" installed | 926lb load | 249lb/in | 13.33" free height.

http://vb.foureyedpride.com/showthread.php?74794-85-gt-springs-vs-factory-mont&highlight=cc821

Moog CC827 1985-93 GT rear springs

http://www.moog-suspension-parts.com/proddetail.asp?prod=MOOG-CC827

End 1 Type​	End 2 Type​	Inside Diameter (Inches)​	Bar Diameter (Inches)​	Install Height (Inches)​	Load (Pounds)​	Spring Rate (Lbs per In.)​	Free Height (Inches)​
Square	Pig Tail​	4.030​	.541​	9.50​	691​	174​	13​

 

Just found this spring rate calculator on Eibach's site so figured I'd put in this thread.

Spring Rate Calculator

Eibach engineers, manufactures, and sells the highest quality performance aftermarket suspension products in the world.

eibach.com

Checked my H&R race rears, by the calculator they're 270, the Eibach lowering springs I bought locally come out to 280, seems pretty close to what was speculated.

 

Checked the Team Z, FWIW they're 11.75" free standing, and show a spring rate of 260# by that calculator.

 

The eibach sportlines for sn95 I think fox as well are 240-260lb rate they work decent and don’t have a huge raked look I was going to remove my sportlines but when I seen that team z springs are the same rate there’s no reason to

 

There's more to a spring than their rate. Team Z sourced the type of steel they needed and did a lot of testing to determine how the springs are wound.
The Team Z springs are progressive thus do not have a single rate. The rate goes up as the spring is compressed.
Just like valve springs; not all are created equally.