Second Gen Spring Rates/lengths
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.
Where should we start?
Thanks Eric
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".
Thanks Eric
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
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
08-26-09, 05:37 PM
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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.
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.
08-27-09, 12:12 PM
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kill it with BOOMSTICK!
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/
http://grassrootsmotorsports.com/articles/lucky-7/
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