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Discussion Starter #1
Hi All,

Thought I would share my findings so far with the 9th gen Civic Si suspension I have recently inspected.

1) Camber plates: The front upper strut mount is identical between the 8th and 9th gen cars; so the ASR plates will work on 9th gen too.

2) Front struts:
- are very similar other than the swaybar tab and brake line brackets at the bottom.
- shock max and min length is about 1/4" longer (very similar); so the Koni insert length will work well. Koni insert fits perfectly in 2012 housing and is 1/4" shorter than the stock 2012 shock, which is fine for anyone wanting to lower the car.
- pin thread and length are the same. (pin is threaded part at top of shock piston)
- lower spring perch is approx 1/8" higher on the body (not too much different but looks slightly higher). perch stamping looks same as 8th gen Si perch.
- strut bearing is different and uses separate upper spring seat part number (not integral like on 8th civic), but the 8thcivic bearing (and integral spring seat) fits perfectly on 9th gen top hat (because the top hats are identical); so retrofits will be easy if needed. Interestingly, there are no bearings is the 9th gen strut bearing... it's some sort of plastic flat bearing and lube that has no moving parts other than the top moving relative to the bottom (and it's very thin and weighs almost nothing).
- the swaybar mounting tab on the 9th gen strut is going to make machining off the lower spring perch more difficult where needed, but it is still doable with manual removing of the spring perch first with a cutoff wheel and then finishing on the lathe.
- strut to upright "knuckle" bolts are larger on 9th gen car (8th was 14mm and 9th is 16mm).

3) Rear shocks
- rear shock is basically identical, and the Koni part will fit perfectly.

4) Rear spring
- the rear spring is slightly different from the 8th gen cars. The ID at the bottom is the same as 8th gen, but the top is not the same. Where the top ID of the 8th gen is significantly bigger then the bottom ID, on the 9th gen, the top is only very slightly bigger; so the upper mounting method must be slightly different. I need to see an actual 9th gen Civic in person before knowing the specifics of how a coilover will fit the back of the 9th gen.
- spring length appears to be the same; so current rear spring specs for coilovers should work the same on the 9th gen car.


And what does this all mean? It means that a drop spring kit for the 8th Civic does not fit the 9th Civic. It also means that a Koni based coilover kit for the 9th Civic is just a few relatively small changes from 8thCivic parts away from working perfectly. But I need a car to know for sure.

Anyone interested in making a 9th Civic available to me to look at. I can make it worth your while. Contact me asap.

Cheers,
Chris
 

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Discussion Starter #2
Here is a quick update from additional inspections I was able to do today.

1) The front spring from a 2006 Civic will fit right onto a 2012 Civic with no modifications at all. You can use ALL the 2012 parts around the 2006 spring (bearing, dust boot, isolator, etc) and it all fits perfectly.

2) The rear spring from a 2006 Civic will fit right onto a 2012 Civic as long as you use the upper spring isolator from the 2006 car. And using the lower isolator is probably a good idea too but the 2012 lower isolator will work ok. The major difference between rear springs on the 2012 Civic as compared to the 2006 Civic is that the 2006 Civic rear spring has an inner diameter at the top that is much larger than the 2012, but the upper spring isolator from the 2006 car will fit right on the 2012 car; so the 2006 spring fits as well.

3) So, what this means is that you can run a full set of 2006 Civic springs on a 2012 Civic as long as you use 2006 spring isolators in back. And here is the kicker.... the 2006 springs are about 1/4" shorter in front and back, which means that any 2006 Civic springs will lower the car an additional 1/4" when installed on a 2012 car. This is significant because we may find that running HFP springs from a 2006 Civic on a 2012 Civic will lower it more than it does on the 2006 car. Might be a cheap (and really good) 1" drop for the new 2012 Civic. Only thing is someone is going to have to actually try it on their car and see how it really sits... what I know so far is that it looks like it will work perfectly, but only a real install will know for sure.

4) Coilover collars for the rear of the 2006 Civic will fit right on the 2012 Civic as well, which means the RedShift Koni-based coilover setup that works so well on the 2006 Civic will work on the 2012 Civic as well....from Koni Sport to double adjustable Koni Race setup!

So, who will try 2006 HFP springs on their 2012 Civic first??

Chris
 

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Good stuff here, sir. So any noticeable differences in the handling characteristics from the 8th? Honda seems to dilute each Si a little bit more each generation as far as track abilities, it seems (remember the EP3 :shudders:) they just up the power, and make it flashier, but gets softer each time. I still love the 97 CX double wishbone setup the most, those chassis' were always begging to be setup for track use :)
 

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Discussion Starter #6
yeah, they sure have gotten away from handling a bit.... the TSX still does it right, but it's just big enough not to be as much fun.

I'm glad the new Civic isn't like the RSX/EP3 because that's just plain ugly front and rear. I have an RSX and hate the suspension on it. Even with fancy shocks and very careful selection of other bits (ASR rear swaybar etc), it still sucks. hahah.... The new Civics are WAY better than that; so I guess we should be happy about that.

Chris
 

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Very nice findings, info and write up Sir as always. Thanks a lot for sharing. I am sure a lot of people will find it useful.
 

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Cant believe I didnt see this until now. Also interested in the pros and cons for both on handling characteristics. On a plus side its good to hear that the suspension is better than the RSX
 

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Discussion Starter #12
They are REALLY similar except the 2012 Si is a little softer. For 2013 I hear they have increased the swaybar size and perhaps they have changed the shocks and springs too?? Not sure... didn't check into it.

But if you have the same lowering springs, shocks, and swaybars on the cars, the 2006-11 vs the 2012+ is VERY similar. The wheelbase on the 2012 is 1" shorter but the car weighs almost exactly the same. So, it may feel a tad different, but most people probably will never notice it.

Chris
 

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The steering rack is also slower on the 2012 but the 2013 was sped up and is either identical to the 8th gen rack ratio or very similar.
 

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I just purchased the godspeed mono-rs coilovers for my 8th gen civic si, but they turned out to be for the 9th gen 2012-13 civic si, what exactly do I need to do to fit these on my car, I was told the fronts will fit in fine and everything will connect fine and does t matter if I leave the sway bar link or not in the front but in the rear all I have to do is get the 9th gen insulators for it to fit into my 8th gen civic. Is this correct? Please any help would be greatly appreciated thanks in advance.
 

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So it sounds like 9g struts will fit the 8g, right? Just ignore the sway bar link tab on the 9g struts. Is this correct?

Because Bilstein HD is available for the 9g, and this would be a great option to have on the earlier cars.
 

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Any input on my previous post by the OP or anyone else that knows for a fact or from experience. Thanks it would be greatly appreciated.
 
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