The Fortune Auto Coilover Kit for the 10th Gen Civic Si is about to launch!

that said, if you know what you're doing, you can, for example, buy ground control rear perches with eibach 2.5" rear springs at say... 4-5k to run about square f/r. the advantage of the fortune springs is probably that they maximize travel. i wouldn't really recommend it, but again, if you know what you're doing..

I will confirm with them. That was not my understanding. But I will find out for sure.

typemismatch said:

Sorry ...

You can't get any spring rate you want ... because you said so in your previous posts, the rear only comes in one rate.

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MAPerformance said:

I will confirm with them. That was not my understanding. But I will find out for sure.

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Spring rates are normal and are actual great for street use. Track wise ? No, it will be better to get something a little more stiffer. And for those that wanna slam there car do not use these spring rates. You will bottom out.

440lbs linear in the rear great for street use? i'm dubious. to be fair, i would be perfectly happy running that rate in the rear and 200-300lbs front to get some rotation and maximize front grip, but from what i've seen, most Si owners would wedge their cars pretty quickly with those rates and before they wedge the car, they would complain about the harsh ride incessantly.

one thing is clear though, you need 200tw tires before you put this on, you need to lower your sway bar rates (stock rear needs to go up, front needs to go down), and you will need to configure everything for maximum travel. you will also need rear toe and camber kits.

otherwise, you're better off with a ground control kit running 150 linear front and say 200-250 linear rear with, again, maximum travel.

during the track and autox season you will need to get a race alignment as well based on how you drive the car.

farqt said:

440lbs linear in the rear great for street use? i'm dubious. to be fair, i would be perfectly happy running that rate in the rear and 200-300lbs front to get some rotation and maximize front grip, but from what i've seen, most Si owners would wedge their cars pretty quickly with those rates and before they wedge the car, they would complain about the harsh ride incessantly.

one thing is clear though, you need 200tw tires before you put this on, you need to lower your sway bar rates (stock rear needs to go up, front needs to go down), and you will need to configure everything for maximum travel. you will also need rear toe and camber kits.

otherwise, you're better off with a ground control kit running 150 linear front and say 200-250 linear rear with, again, maximum travel.

during the track and autox season you will need to get a race alignment as well based on how you drive the car.

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14F and 16R spring rates. From NY to Florida. Ride was comfortable.

just fyi, i've chatted with nathan @ fortune and he said that a) they can build up 510 and dreadnaughts, not just 500s. also, the rear perches and eibachs from a ground control kit will work perfectly with their setup -- the rear damping rates are built to spec and can vary from fairly soft up to rocks with shafts on them.

We are currently in the works with Fortune Auto, trying to develop a dedicated drag racing solution for our car. The process has been very enlightening for me... and I am looking forward to the solutions that will be provided. Speaking candidly, I can tell you that the drag racing experience and data we have would be of very little use to anyone looking for a compliant street ride... other than to suggest some simple fundamentals.... which really involve dispelling common misunderstandings.... one thing that is important to know is that spring rates are spoken about a LOT... and understandably so... they are typically advertised from the manufacturer, BUT what makes those spring rates work... well, that information is NOT shared so inevitably, customers begin to associate spring rates with quality, compliance, performance, ETC... WHEN the REAL work of a coilover solution really focuses on the damping ability...not even the adjust-ability (although admittedly, the more uniquely adjustable a coilover is, the more the likelihood that high quality components are being used increases).

Long story longer...hahahaha... spring rates AND valving need to work together.

Looks like their 500 series coilovers are ready to order.
https://www.shop-fortune-auto.com/c...10-fk-si-coupe-only-2017-500-series-coilovers

These things look awesome.

Sad that theres non available for fk7.

SouthSideBeef said:

Looks like their 500 series coilovers are ready to order.
https://www.shop-fortune-auto.com/c...10-fk-si-coupe-only-2017-500-series-coilovers

These things look awesome.

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The URL says coupe only though...

ThatDustyFox said:

The URL says coupe only though...

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I'm pretty sure they will also work with the si sedan. You'd have to ask them to be certain but I don't know why they would be different.

they're not coupe only. there are no differences between the Si coupe and Si sedan in terms of suspension

I believe that farqt is correct... but I will know more soon. We did just wrap up coordinating what I anticipate will be a very good drag racing suspension set up for the platform. I wouldn't recommend what we have getting built for anyone other than people who plan to have a dedicated drag race car, but this certainly goes to show you that Fortune Auto is an awesome resource for just about any suspension set up request. I sent them an initial couple of questions about their damping limitations coupled with some logical assumptions based on our interpretation of their advertised facts... The response they sent back indicated that they would be open and receptive to specification criteria, almost as detailed as we would like... which tells me that they have a great deal of capability in house. We decided to sent them a rough idea of what our desired PVP plot would perform like here:


Fortune Auto essentially replied that they would be able to build our dampers to specification supplied.

These are ALL services they can provide for anyone... more on that can be read bout here:

https://fortune-auto.com/shock-dyno-basics/

but I am growing more and more excited about the upcoming race season!

they either build everything in house (for 510 up to dreads) or they get made to spec dampers and springs (500 series) from a reliable overseas supplier and then dyno match and adjust valving in house. their pricing is a huge bargain. dealing with bilstein (UGH), KW (pretty ugh. if you aren't running clubsports or higher they don't care), and koni (except for the koni race division and truechoice) is just not worth the time.