I was actually wondering about this. If the spring rates were correctly matched. Why wouldn't this work? Other than losing height adjustability in the rear, I dot see why not. Maybe this would solve that problem of the clunking noise from the bc sprig adjustment.

Does anyone know what the spring rates are on the bc racing coils that use swift springs?

I don't need to go lower, but if I could swap in the bc fronts with swift springs and just use the strut in the rear so that dampening adjustments could be made, I think it would be a win

 

Oh no. You wont use Swift Spring up front as the coil and strut are one ...but in the rear for the X the strut and spring are seperate thus the ability to swap rear swift springs for the bc springs. Look up a pic of uninstalled bc coilovers for the X...

 

http://www.czp.us/cart/images/6904l.jpg

 

Tunerz Store is working on this setup with swift springs and rubber bushings on a set of BC coils. They are still testing them out when I spoke to them last week.

F - 8k Swift Springs
R - 6k Swift Springs

Seems the BC struts are the culprits of all the noise. They swapped in the OEM struts and the noise disappeared. My input is to try a different manufacturer's rear adjustable strut seeing as the RWD and AWD sedan share the same rear suspension geometry.


I'm personally waiting for them to figure out a solid option before I jump on coil overs. Fortune Auto did mention getting involved with a set of AWD coil overs, but that won't be for about a year.

 

Ok I misunderstood. I thought they were releasing a coilover using swifts and that we could replace the rears with the springs that they have out now from swift. My mistake, but then will the bc springs up front be paired properly (rate wise) with the swifts in back? From my understanding I thought it was a bad idea to mix and match springs due to unpredictable reactions when turning.

That said, I look forward to what happens with this.

 

Ok, maybe koni yellows in back then?

I didn't see this post before my last one. Thanks for the info.

 

Thanx for all this input guys , one thing I was think was gettin a extra cusion for the rears , blewnt mentioned this I think , an he had set he hadn't installed yet. I'm going to pm the vendor and ask ? Be let's keep this up in in for hearing all there is , since I never bought coils just want to learn as much as I can . And I got time these aren't going in till at least April .

 

just got mine put on today and haven't heard any knocks but haven't had a chance to drive around too much yet. Crossing my fingers but I guess we'll see what happens...

 

You will hear the knocking in a few days. Knock knock who's there? BC's.

 

HAha, Come on man no faith.. Is there a reason BC has never addressed this issue? If all it is a thicker cushion ?

 

FWIW I have D2 Racing coilovers on my 10' X sedan and they are perfect so far after about 10K miles. They bolt right up with no issues and so far no sounds or noises at all. Weird I havent seen people mention these coilovers which means maybe they dont make them anymore. Ill have to check. Just a heads up if anyone wants to check it out.

 

I have been on Tanabe coilovers for about 6 moths

I rarely get the clunk noise when I hit large bumps.
It seemed to be worse then I first put them on.

No issues for a good 3-4 months

 

So I'm a little nervous I brought the clunk noise up to the vendor and asked about adding a thicker cushion or thoughts on not having it and they said they never heard anything about it?

 

Who did you purchase from?

 

It has nothing to do with a "thicker cushion"... the noises are coming from the rear struts - something internal. Usually the noises are common at low speeds when hitting road imperfections.