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      01-28-2019, 11:42 PM   #45
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Quote:
Originally Posted by mikew2069 View Post
I tried searching around but couldn't find spring rates. Does anyone know the standard suspension factory spring rates for front a rear? I would also like to know H&R and KW spring rates.
Those are progressive spring rates.
Even KW coilover are progressive.
Track purposes uses linear spring where mostly have the spring rate stamped on.
For street uses, 99% are progressive spring rate or linear with helper spring to compensate road imperfection.
Progressive spring rates are based on ranges, not a static number.
Usually companies trying to hide those numbers since it is their trade secret to make comfortable ride on the street while reducing body roll.
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      01-29-2019, 06:44 AM   #46
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Quote:
Originally Posted by r33_RGSport View Post
Those are progressive spring rates.
Even KW coilover are progressive.
Track purposes uses linear spring where mostly have the spring rate stamped on.
For street uses, 99% are progressive spring rate or linear with helper spring to compensate road imperfection.
Progressive spring rates are based on ranges, not a static number.
Usually companies trying to hide those numbers since it is their trade secret to make comfortable ride on the street while reducing body roll.
Although they're progressive, don't they still have a rate such as X/Y/Z for the ranges?
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      01-29-2019, 09:13 AM   #47
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Quote:
Originally Posted by mikew2069 View Post
Quote:
Originally Posted by r33_RGSport View Post
Those are progressive spring rates.
Even KW coilover are progressive.
Track purposes uses linear spring where mostly have the spring rate stamped on.
For street uses, 99% are progressive spring rate or linear with helper spring to compensate road imperfection.
Progressive spring rates are based on ranges, not a static number.
Usually companies trying to hide those numbers since it is their trade secret to make comfortable ride on the street while reducing body roll.
Although they're progressive, don't they still have a rate such as X/Y/Z for the ranges?
They should, but I never seen them posted and bragged about.
Unlike linear spring rate.

I used to work for Japanese coilover company, where uses linear spring rate and we always publish the spring rate publicly.
Those spring rate number is like our marketing or bragging number.
Guys will be, "yea, mine is 12kg front and 8kg rear setup".

But, I never heard or seen progressive spring rate being published or bragged or used for marketing.
Personally, I like Linear spring setup, even if it will make your tooth filling coming off for daily drive.
But, in general market, progressive is the winner.
That's why KW is prevailing for street market. They use a perfect spring and shock setup for street use.
For track market though, they are considered as beginner setup.
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      01-29-2019, 10:09 AM   #48
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Originally Posted by M302_imola View Post
Passed an F85 X5M on the interstate today and really liked the stance. Has me wondering if the F85 X5M suspension can be used on the F15 X5? I have an xline with standard suspension...would the X5M suspension lower the car significantly?
F85 is also on airbags in the rear. Not springs. And the bags also sit lower as well as the front springs. I've actually brought up the idea of swapping in F85 bags when those with bags start to fail who are also interested in lowering.
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      01-29-2019, 10:43 AM   #49
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Do you think we can add something similar like kw v3 dampening shocks for the rears ?
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      01-29-2019, 10:51 AM   #50
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Originally Posted by daytonaviolet View Post
Do you think we can add something similar like kw v3 dampening shocks for the rears ?
I think the only option right now is to go with Bilstein B6.... if you can get your hands on them.
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      01-29-2019, 12:22 PM   #51
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Quote:
Originally Posted by Maverik259 View Post
F85 is also on airbags in the rear. Not springs. And the bags also sit lower as well as the front springs. I've actually brought up the idea of swapping in F85 bags when those with bags start to fail who are also interested in lowering.
That would be a cool setup on the F15. Prob way to expensive unless like you said someone is discarding the F85 suspension to lower.
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      02-02-2019, 09:05 AM   #52
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Quote:
Originally Posted by M302_imola View Post
Quote:
Originally Posted by Maverik259 View Post
F85 is also on airbags in the rear. Not springs. And the bags also sit lower as well as the front springs. I've actually brought up the idea of swapping in F85 bags when those with bags start to fail who are also interested in lowering.
That would be a cool setup on the F15. Prob way to expensive unless like you said someone is discarding the F85 suspension to lower.
It's basically the same price as F15 air bags.
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      02-05-2019, 09:57 PM   #53
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So originally I was thinking I was going to take a stab at the BC option but I've been talking to them and also talking to Silvers. I'm getting a better feeling from Silvers and they are much more responsive.

Does anyone have experience with Silvers Neomax coilovers? They seem to be pretty big in the WRX community and in Europe.
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      10-11-2019, 08:28 AM   #54
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Quote:
Originally Posted by mikew2069 View Post
So originally I was thinking I was going to take a stab at the BC option but I've been talking to them and also talking to Silvers. I'm getting a better feeling from Silvers and they are much more responsive.

Does anyone have experience with Silvers Neomax coilovers? They seem to be pretty big in the WRX community and in Europe.
Hey did you ever end up going this route? interested to hear how the ride quality and handling is.
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      11-07-2019, 06:23 AM   #55
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Hey did you ever end up going this route? interested to hear how the ride quality and handling is.
Sorry I haven't been on here much but yes I've experimented my a$$ off. I bought Silvers and KWs. Long story short, the KWs were bouncy up front and I couldn't get the Silvers spring rate dialed in in the rear.

The perfect setup was Silvers in the front and KW in the back - perfect. But of course that isn't practical from a cost perspective. So I sold my KWs and I'm currently running my Silvers up front with my H&R sprint in the rear with Silver shock and it rides damn good.

Also keep in mind, I'm super anal.
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      11-07-2019, 06:36 AM   #56
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Quote:
Originally Posted by mikew2069 View Post
Sorry I haven't been on here much but yes I've experimented my a$$ off. I bought Silvers and KWs. Long story short, the KWs were bouncy up front and I couldn't get the Silvers spring rate dialed in in the rear.

The perfect setup was Silvers in the front and KW in the back - perfect. But of course that isn't practical from a cost perspective. So I sold my KWs and I'm currently running my Silvers up front with my H&R sprint in the rear with Silver shock and it rides damn good.

Also keep in mind, I'm super anal.
I think my best route will be to just go with eibach springs.
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      11-07-2019, 09:07 AM   #57
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megan racing, godspeed, and all those Ebay brands are bottom shelf brands that have terrible reputation in durability, performance, and fitment.

donut media did a demonstration between top shelf brands vs bottom. I'm gonna post one of their vids they did with the 350z platform.

https://www.facebook.com/donutmedia/...0048823002518/
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      11-11-2019, 06:53 AM   #58
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In the market for an F15 and just drove one yesterday with stock suspension. Couldn't pull the trigger on the purchase even though the price was excellent. Felt mush and disconnected from the road. Far from my E70 with H&R sports that I can throw into corners.

I really want to buy this vehicle. I'm guessing KWs are my best option to stiffen the suspension without sacrificing ride comfort quality? I don't necessarily want lowering. Just a tighter feeling with comfortable dampening.
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      11-13-2019, 05:45 PM   #59
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Quote:
Originally Posted by Tritan84 View Post
In the market for an F15 and just drove one yesterday with stock suspension. Couldn't pull the trigger on the purchase even though the price was excellent. Felt mush and disconnected from the road. Far from my E70 with H&R sports that I can throw into corners.

I really want to buy this vehicle. I'm guessing KWs are my best option to stiffen the suspension without sacrificing ride comfort quality? I don't necessarily want lowering. Just a tighter feeling with comfortable dampening.
I agree the stock suspension is mush. If you just want a bit stiffer and don't care about lowering, just go with Eibach springs and be done.

I will go to my grave with my opinion that KWs are overrated on this platform. I've had KWs on other cars and they were amazing. On the F15, it was bumpy up front. Maybe I'm just too picky
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      11-13-2019, 09:35 PM   #60
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Quote:
Originally Posted by mikew2069 View Post
I will go to my grave with my opinion that KWs are overrated on this platform. I've had KWs on other cars and they were amazing. On the F15, it was bumpy up front. Maybe I'm just too picky
I found the front too bouncy until I added some extra rebound damping. Slowing down the rebound eliminated the bounce for me.
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      11-13-2019, 10:19 PM   #61
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Quote:
Originally Posted by mikew2069 View Post
Quote:
Originally Posted by Tritan84 View Post
In the market for an F15 and just drove one yesterday with stock suspension. Couldn't pull the trigger on the purchase even though the price was excellent. Felt mush and disconnected from the road. Far from my E70 with H&R sports that I can throw into corners.

I really want to buy this vehicle. I'm guessing KWs are my best option to stiffen the suspension without sacrificing ride comfort quality? I don't necessarily want lowering. Just a tighter feeling with comfortable dampening.
I agree the stock suspension is mush. If you just want a bit stiffer and don't care about lowering, just go with Eibach springs and be done.

I will go to my grave with my opinion that KWs are overrated on this platform. I've had KWs on other cars and they were amazing. On the F15, it was bumpy up front. Maybe I'm just too picky
I believe one of my customer bought yours.

When I about to install it, I found out that the front had 2 bump stop.
The stock one and the KW one.

If it was yours, it might have been why your ride is very bumpy on the front.
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      11-14-2019, 08:55 AM   #62
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Quote:
Originally Posted by mikew2069 View Post
Quote:
Originally Posted by blakedunc235 View Post
Hey did you ever end up going this route? interested to hear how the ride quality and handling is.
Sorry I haven't been on here much but yes I've experimented my a$$ off. I bought Silvers and KWs. Long story short, the KWs were bouncy up front and I couldn't get the Silvers spring rate dialed in in the rear.

The perfect setup was Silvers in the front and KW in the back - perfect. But of course that isn't practical from a cost perspective. So I sold my KWs and I'm currently running my Silvers up front with my H&R sprint in the rear with Silver shock and it rides damn good.

Also keep in mind, I'm super anal.
I remember someone saying weight of the f15 on the bc silvers may be an issue, how do you feel after riding em for about a year?
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      11-14-2019, 07:18 PM   #63
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Quote:
Originally Posted by r33_RGSport View Post
Quote:
Originally Posted by mikew2069 View Post
Quote:
Originally Posted by Tritan84 View Post
In the market for an F15 and just drove one yesterday with stock suspension. Couldn't pull the trigger on the purchase even though the price was excellent. Felt mush and disconnected from the road. Far from my E70 with H&R sports that I can throw into corners.

I really want to buy this vehicle. I'm guessing KWs are my best option to stiffen the suspension without sacrificing ride comfort quality? I don't necessarily want lowering. Just a tighter feeling with comfortable dampening.
I agree the stock suspension is mush. If you just want a bit stiffer and don't care about lowering, just go with Eibach springs and be done.

I will go to my grave with my opinion that KWs are overrated on this platform. I've had KWs on other cars and they were amazing. On the F15, it was bumpy up front. Maybe I'm just too picky
I believe one of my customer bought yours.

When I about to install it, I found out that the front had 2 bump stop.
The stock one and the KW one.

If it was yours, it might have been why your ride is very bumpy on the front.
@mikew2069

Have you been able to confirm this?
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      12-06-2019, 06:57 AM   #64
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Quote:
Originally Posted by fr_tz View Post
@mikew2069

Have you been able to confirm this?
Sorry I haven't been on here for a while. I did ship them with an extra set of bump stops that I had but I did not have them installed with the stock bumpstops.... Maybe I just couldn't find the magic combo of rebound/dampening settings but I sure as hell tried.
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      12-06-2019, 06:58 AM   #65
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Quote:
Originally Posted by Jars914 View Post
I remember someone saying weight of the f15 on the bc silvers may be an issue, how do you feel after riding em for about a year?
I can only speak for the Silvers. The front still ride like a dream. I was never ever really able to dial in the rear so I just gave up and put my H&R spring in the rear with the Silvers shock and its great now. Just not as low as I'd like.
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      12-17-2019, 10:04 AM   #66
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Quote:
Originally Posted by mikew2069 View Post
I agree the stock suspension is mush. If you just want a bit stiffer and don't care about lowering, just go with Eibach springs and be done.
So would getting Eibach springs alone will help with floaty body roll feeling of standard suspesion? It's my wife's car and she doens't care about lowering but complains about how floaty car feels. We have 2015 50i with stock suspension.

Thanks
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