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09-30-2019, 04:28 PM | #15 | |
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Softer springs may cause the car to roll more than you want, but between ride height and camber plates up front and top mounts in the rear, you should be able to put together a suspension where you aren't forced to set up your car around hitting bumpstops under normal circumstances. Last edited by steverife; 09-30-2019 at 04:57 PM. |
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09-30-2019, 04:42 PM | #16 |
Since it hasn't come up yet, this is your reminder that the stock suspension is very bumpstop active. You're hitting the bumpstops early and often (not just during performance driving). This is intentional. There's a difference between "bottomed out" and just hitting the bumpstops.
Some coilovers will ride the bumpstops as well, depending on how they're set up and the spring rates used. Sometimes it's very noticeable, sometimes it's not. For example, the bumpstops on BC coilovers are (were?) very hard. Other coilovers may use much softer/progressive bumpstops and it may be more difficult to tell when you're hitting them. Spring rates certainly aren't irrelevant, but they are just one part of the system. - Andrew |
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09-30-2019, 04:53 PM | #17 |
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There's also the whole topic of "bumpstop tuning" as they are being used more and more in how a car settles on compression
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09-30-2019, 05:21 PM | #18 | |
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Thanks for bringing this up. OEM tuning from Mazda on the new MX-5 is VERY bump stop active too.
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10-01-2019, 04:07 PM | #19 | |
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That setup seems optimal for me. Stock wheel width and spirited street driving with one or two track days per year. |
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10-01-2019, 04:17 PM | #20 | |
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10-01-2019, 04:32 PM | #21 | |
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- Andrew |
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10-01-2019, 05:00 PM | #22 | |
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Throw on something less sticky then perhaps you can optimize for that tire. 6kg is not enough spring rate if you want to optimize for maximum grip from a modern 200tw tire. If we are talking about a car that is turning laps a few times a year and you don't care about ultimate lap times then perhaps it is perfect.
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10-01-2019, 06:24 PM | #23 | ||
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It's "optimal" only be definition of what the intended goal is. Which lincoln just stated. few track days a year for self improvement without regard to setting lap times or competition. If you want to compete you'll go to a more serious set up. You also wouldnt be running 18x8 225's at a track event if you were serious. |
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10-02-2019, 10:39 AM | #24 |
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Thanks guys. One last thing. With adjustable dampers would running soft settings have the effect of feeling like the springs got softer as a whole? I'd rather start a little higher on spring rate and adjust them softer if I start losing too much grip.
So for instance if I bought 8k springs and the softer setting would bring them down to feeling like 6k, relatively, with all of the components at work. |
10-02-2019, 11:42 AM | #25 | |
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Short answer: yes. Long answer: not really. As stated springs are only part of the equation. From what I've been reading and my discussions at the track it seems shock valving has a much higher effect ride quality, especially with (3 way? 4 way?) adjustable shocks. From my understanding for track use you typically want the low velocity bump damping to be high and high velocity bump damping to be low. Low velocity bump would be from driver inputs. If the shock only allows slow movement for these then the car can react faster to the driver inputs because you don't have to wait on the suspension re-settling. The high velocity bump will be from the actual road imperfections, curb, etc. With low damping on the high velocity bump then the suspension can soak up these imperfections much better without upsetting the car. Once again I am not a professional/expert in this area but I do have a lot of interest/discussions about it. PLEASE correct me if I'm wrong. That said I am also talking about a 'typical' situation for any car and as we know nothing in racing is really typical and every car is different. |
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10-02-2019, 12:04 PM | #26 |
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With one or two track days a year it would be better to go with softer spring rates and invest in a high quality shock/coilover system, that can stiffen up quite a bit at the track. Either way you're going to compromise, it just depends on which side you favour more, comfortable on the street or capable on the track.
Expensive and more advanced coilovers like the upcoming Xida, CSG Flex A, JRZ, Ohlins etc. will be the closest you can get to having your cake and eating it too. Digressive valving will likely be your friend. Last edited by RayRay88; 10-02-2019 at 12:17 PM. |
10-02-2019, 01:26 PM | #27 | |
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You need to spend big money to come close to having your cake and eating it too. I have MCS 1WNR coilovers, and yes for 8kg/450lb springs, it does ride well but it still gets busy over really torn up pavement at city speeds. Up the pace and start hopping curbs and the track and everything is right in the world. Adjusting your damping on a high end shock goes a long way but you can't hide the fact you are running spring rates 3 times stock. Sway bars will also have an impact. Stock sways will ride better than big beefy sway bars. Another massively overlooked area when it comes to ride quality is the tire selection. Rolling around on sticky RE-71r? Cabin noise jumps up and the stiff sidewalls make the car ride worse. Throw on a set of ECS or Pilot 4S tires and your ride quality will increase. Likewise, tire/wheel width also will have some impact. For me, I run around on a set of TRD 17x7.5 wheels with the stock tires when I'm not running the car at competition and drop the damping. When autocross time comes around I swap wheels and change my damping.
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10-02-2019, 01:59 PM | #28 | |
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