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Second Gen Spring Rates/lengths

Old 08-26-09, 01:55 PM
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Second Gen Spring Rates/lengths

Hi Guys,

What are the average spring rates you guys are using front and rear. How about spring lengths? We purchased a set of AD shocks from a guy the quit on his Prod project. Emailed Ground Control with the numbers to get an idea of valving.
The official answer is that "There is not much info about those shocks. Looks like its a fairly basic valving that should work for a wide range of springs usually used on a second gen".
Where should we start?

Thanks Eric
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Old 08-26-09, 02:14 PM
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front rate is usually 350-450lbs in 6-7" spring

rear is 225-250-275lbs in 6-8" spring

length depends on how low you want to be. with YOUR camber plate/spring perch/coil over combo, they vary a bit.

for example one of our cars is at a 25" ride height (top of wheel arch to ground) with a 6" front and 7" rear springs that's about as high as it goes. which is fine cause its mostly a street car. with 7" springs 24ish would mean its all the way down...

if AD = advanced design, you should at least make sure they actually work before you put them in
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Old 08-26-09, 05:37 PM
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Originally Posted by wlfpkrcn View Post
Where should we start?
I saw your other post on another forum and a 400/250 starting point, also I believe about what Mazda comp did/used to recommend. While the reply came from a very respected and good driver, those aren't going to be his spring rates nor would he disclose what he's dialed in. Call Flatout http://www.flatout-motorsports.com/index.php who has campaigned many winning ITS cars, they were recommending a 550/400 last I heard.
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Old 08-26-09, 07:01 PM
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Thanks! From my digging it sounds like 7" and 10" springs. Any opinions there?
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Old 08-26-09, 09:40 PM
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I was running a 7" 400/300 setup on GCs and Konis. With the collars nearly all the way up it was just a tiny bit low (the front just tucks and the rear rubs occasionally), but doable on the street and with my r comps for auto-x. I just installed a set of 6" 650/500 springs, and which sit at nearly the same ride height as the above setup. These things are pretty damn rough on the street, and I can post a auto-x report after Sunday. Also, helper springs in the back could be useful, I have to check to make sure they seat right every time I change tires. Again, your setup may vary, but I'd probably err on the taller side.
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Old 08-27-09, 11:23 AM
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FYI- This for an ITS/ PT car. It won't see the street except for loading on the trailer. Thanks for the info guys
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Old 08-27-09, 12:12 PM
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this is an article from grassroots motorsports magazine about Sylvain Tremblay's ITS FC RX-7 that won the SCCA national championship 2 years in a row, and it lists the spring rates and other details on how he set up the car to win.

http://grassrootsmotorsports.com/articles/lucky-7/
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