I think I am regretting my spring selection

03threefiftyz

I give up, bro. Whether the math make sense in your head or not, no one that wins anything of note runs frequencies within your above guidelines....period. No open pro GT series is going to have cars even close to 2.5hz or lower. It's just fact.

I should also mention, my car is considered "soft" by most, and I run about 2.3/2.15hz.

03threefiftyz

Should also mention that clintfocus is absolutely right on how front tire size and compound plays into things, but even if it were a 255 RS3 or the like, I would want 1.9-2hz up front, at a minimum without aero.

cv129

He's on Fortune Auto 510's

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Setrab | RE-71 | SPL | JRZ | Nismo | ARK | Whiteline | RacingBrake | CJM Oil Pan | Ti shield

clintfocus

all hz's aside, just from my ricer math, a car with something like 275-285 up front, like what i run, even on a entry level r compound, 14kg is what id put up there no hesitation, and that's still on the compliant side for the bumpy socal tracks. but if the dampers dont do there just the car will get unsettled, which more so may be Cossie's issue with those Fortune's (no offense).

the day i DO run something like that up front, ill be on a custom valved KW, or a JRZ double adjustable damper.

cossie1600

I haven't put it on the car yet. I was just thinking I should have done 10 or 12k with a big sway bar instead of 14k with stock bar. The shocks are supposed to be build for the springs, which is more of a build than any off the shelf items i can buy. I hope to get everything installed this weekend so I can try it at Laguna Seca as I had already established a baseline there last month.

clintfocus

wait you havent tried them yet? dude it'll be fine LOL

cossie1600

been working like crazy and i have no time, need to do it this weekend, about to set the preloads tonight

03threefiftyz

I used custom double motons last couple of years, but I am switching to Penske for 2014. I've gone as high as 1200lb on the front of my car, but while it transitions great (315 Hoosier A6's), the point of diminishing return overall is right around 1000lb on front. Anything over 1000lb, again while better on transition, sacrifices in sweeper grip. That said, part of that was not having quite enough camber as well. Unless something has changed, the major issue with KW is that they won't custom valve anything until you get to the motorsports line, which has very little following in the U.S. They certainly are not a poor product, though.

synolimit

Terry from fortune auto recommended me these...

Hello Scott,
Based on your intended usage and vehicle, I would recommend:
15k front and 13k rear spring rates.

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13 370z-

03threefiftyz

I hope that 13k isn't in coilover form...?

synolimit

I'm sure it is. 510's

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13 370z-

GSS138

And sorry, not trying to be a jerk. I think we prolly agree more than disagree here. Any full on race car yes is going to be 2.5+ . With a daily driver, yes I think what you are suggesting is true as well-2.3 is about the upper limit of what is usable wo rattling your teeth out driving to McDonalds. The front to back split is what I think is ultimately important. My only point I was trying to get across is that at 14K, I think there is a threshold based on the weight of this car. That's it.

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Current Mods: Vorpal Weapon +5.

clintfocus

i have some connections with KW so if i needed something valved i could get it same with JRZ.

GSS138

Cossie do you drive or trailer to Laguna Seca? I thought you were towards Orange County? I want to get up there but not willing to drive the whole way-need to buy or rent a trailer.

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Current Mods: Vorpal Weapon +5.

cossie1600

I trailer my tools and tires to laguna, I live 90 miles from it