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Exocet spring rates 550F & 350R? Sway bars to match?

 
Old 02-26-2019, 08:24 PM
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Default Exocet spring rates 550F & 350R? Sway bars to match?

OK. After spends many hours reading hundreds of pages here without shitposting about suspension, I've come to the conclusion that 550 front and 350 rear is probably good for an Exocet. They are too soft for most Miatas, but if you shave off 700-800 lbs, I think the spring rates are about right. Going to put them with some full length coilovers like Xidas XL or something.

Edit: 1500 lb Miata. I'm using the car for track use and HPDE with some autocrossing in there. I'll probably be using soft compound road legal tires since I'm making the vehicle steet legal and do not want to trailer it everywhere...yet. I'll get there at some point.

Buy once, cry once.

What should I do about sway bars / anti-roll bars? I've only used them in stock-ish class autocrossing to improve rotation...or as a poor man's way to improve roll resistance on gravel or shitty concrete without stiffening the spring rates. Even in simulators I've always left them alone because spring rates, dampening, and rebound are more important. I know how they affect everything but I don't know what is a good combination besides stock. I've spent time digging though the forums but apparently I am not keywording hard enough. What is the general consensus here about sway bars on Miata platforms for track use here?

Someone educate my ignorant *** on sway bars. People seem to do more harm than good with them.

Last edited by Xaendeau; 02-26-2019 at 09:04 PM. Reason: Added intended uses.
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Old 02-26-2019, 08:53 PM
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"Right" completely depends on the application. Those rates look completely soft and wussy for a track build if you ask me.....but I don't own an exocet. List your intended usage and goals for the car.
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Old 02-26-2019, 09:05 PM
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Iím running 9k/6k (~500/325) on my exocet itís turboed around 225hp estimate. They were much too soft when it was a Miata but find them bearable on the Exocet, I do think Iíd go a little firmer next go and get a better set like the XLs now that Iím tracking it.

I run a hollow RB front sway and no rear sway. I do believe I would be better off tuning with coilovers better and running a small rear sway but the back comes around really easy for me. My exocet is around 900lb front / 675 rear weight so the back is pretty light.

Iím not running any aero right now but will be this coming season so canít speak to how that changes anything till it happens. Donít know what your aero plans are either way.
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Old 02-26-2019, 09:06 PM
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Originally Posted by Xaendeau View Post

1500 lb Miata. I'm using the car for track use and HPDE with some autocrossing in there. I'll probably be using soft compound road legal tires since I'm making the vehicle steet legal and do not want to trailer it everywhere...yet. I'll get there at some point.
Added.
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Old 02-26-2019, 09:38 PM
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Originally Posted by thommorud View Post
Iím running 9k/6k (~500/325) on my exocet itís turboed around 225hp estimate. They were much too soft when it was a Miata but find them bearable on the Exocet, I do think Iíd go a little firmer next go and get a better set like the XLs now that Iím tracking it.

I run a hollow RB front sway and no rear sway. I do believe I would be better off tuning with coilovers better and running a small rear sway but the back comes around really easy for me. My exocet is around 900lb front / 675 rear weight so the back is pretty light.

Iím not running any aero right now but will be this coming season so canít speak to how that changes anything till it happens. Donít know what your aero plans are either way.
Thanks for the input. I might consider going a little stiffer then. Our roads are a little apocalyptic, so I'm wary of ultra stiff setups. I'm running 8k front, 6k rear with a fat rear sway on an SMF (autocross) turbo'd Fiesta around 2500 lbs with the back seats and spare out. I could have gone a tad stiffer in the Fiesta and it still would be streetable.
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Old 02-27-2019, 07:31 AM
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I had my Exocet street legal for a couple years, it weighed in around 1650 when it had its windshield and all the lights and fenders. I did a couple long trips in it, CT to TN for Miatas at the gap. Ill advise you its not a comfortable car to drive on the street. The wind and noise is pretty bad and I would dread the drive home after AutoX since I just didn't want to deal with it. It is great for short trips or back roads but Highways are the worst.

Id advise against the Exomotive glass windshield if you were looking at it. It is only supported on the bottom and lower sides so it will flex with wind and buffeting from passing trucks which causes it to crack pretty easily. Mine lasted less than a month before it replaced it with Lexan and added a center and taller side supports.
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Old 02-27-2019, 06:10 PM
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Don't pretend your exocet is a 1500# miata. They handle nothing alike, and respond to springs and bars completely differently - same reason they use much less camber then a miata - Exo has enormous lateral stiffness and a much lower CG relative to a miata. 550/350 is probably close on 200tw tires, but you are going to want way bigger rates on sticky rubber/r comps if you want to be fast.

Last edited by Dietcoke; 02-27-2019 at 06:22 PM.
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Old 02-28-2019, 10:37 AM
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550/350 should be a good place to start assuming 205/50 Street tires. Because of the subframe relocation in the EXO chassis, the car will end up being a bit loose if you directly copy Miata alignment and hardware settings. Miata is never faster with the rear sway bar disconnected unless you have a bad setup that we often see XO owners disconnecting the rear sway bar to get the rear end under the control. That is because of the rear subframe height. There is one very vocal opponent to this fact in the exosphere but you can ignore that. Another concern is that the Exo tends to be more nose-heavy the Miata as it is easier to remove weight from the rear of the exos than the front. So we suggest running Miata setup and setting the rear ride height roughly 3/8 inch lower than front. If you set the car level as mentioned before it will likely be very oversteery (fancy technical term) and you will have to Band-Aid the setup to compensate.

Sway bar choice is a function of ride height and grip level. As you raise the ride height the car gains roll stiffness so less sway bars needed. The roll moment is essentially how much force is making the car roll. That is directly related to the grip level of the tires. Stickierr tires means stiffer sway bars. Assuming a conservative ride height at around 5.25 inch I would suggest sticking with the stock sway bars both front and rear. if you were skeptical about that I would suggest trying it first and see how you like the way the car works. You can always add sway bars later if needed.
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