PSA. 2025 Si, Eibach PRO kit, rough ride

[SuperDave]

**Updated my opinion a few posts down. I got accustomed to the ride, and am happy with the Eibach PRO kit, would recommend**

Ok, so I'm a huge fan of Eibach. I've had their shocks and springs on several vehicles. 1998 civic with pro kit, rides like a dream. 2024 civic EXL hatch pro kit, rides like a dream, my 100 series land cruiser I run their front shocks, amazing. BUT...

Just installed 11th gen SI pro kit lowering springs on my 2025 Si. The drop and gaps are great.

The ride is horrendous. Not sure if Eibach has actually tested these springs on a 2025, but it's bad. Bouncy, bumpy, rough ride. Car has 500 miles on it. Stock springs are honestly great, just too tall for me.

I will update after I put more miles on it. The 2025 Si gets a stiffer chassis and different shocks. Curious if that is the difference. Most 11th gen Si owners seem happy with the kit from my research.

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[chopsuey34]

Thanks for letting us know. The 25 Si body is about 3% stiffer, and the front subframe mounts and mounting points are more rigid than the pre-refresh. That's what might be causing the bounciness imho.

The dampers are actually a little more compliant because of the additional body & suspension stiffness.

 

[SuperDave]

Thanks for letting us know. The 25 Si body is about 3% stiffer, and the front subframe mounts and mounting points are more rigid than the pre-refresh. That's what might be causing the bounciness imho.

The dampers are actually a little more compliant because of the additional body & suspension stiffness.

I'm hoping things will settle in and I'll get used to it. The stock spring was a nice balance of stiffness for handling yet still keeping ride comfort acceptable. I'm not sure if I should try better shocks like Koni, different lowering springs, or just go straight to coilovers.

 

[rui]

Thanks for sharing!

I'm assuming you loaded the suspension before tightening everything up, to prevent the bushings from binding? Not doing that could cause harshness.

I've personally always been weary of lowering springs with stock dampers (how could they ever match?), and haven't found a lot of good coilover options for the Si. I have my eyes on ST suspension ones (KW subsidiary - KW itself doesn't to offer anything for the Si), but would love to read a review before parting with my hard earned.

ps: love the wheels!

 

[SuperDave]

Thanks for sharing!

I'm assuming you loaded the suspension before tightening everything up, to prevent the bushings from binding? Not doing that could cause harshness.

I've personally always been weary of lowering springs with stock dampers (would could they ever match?), and haven't found a lot of good coilover options for the Si. I have my eyes on ST suspension ones (KW subsidiary - KW itself doesn't to offer anything for the Si), but would love to read a review before parting with my hard earned.

ps: love the wheels!

UPDATE: So after a few hundred miles I am completely used to the more stiff ride. The drop is perfect for my taste. The stiffer ride is a good thing because I scrape and bottom out a lot LESS than my 2024 exl that was lowered on the pro kit.

I'm happy with the Eibach PRO kit on my 2025 Si. Don't plan to upgrade or change anything in regards to shocks/springs anymore.

And yeah I love these wheels. Konig Ampliform. Cheers!

 

[OGGsr]

UPDATE: So after a few hundred miles I am completely used to the more stiff ride. The drop is perfect for my taste. The stiffer ride is a good thing because I scrape and bottom out a lot LESS than my 2024 exl that was lowered on the pro kit.

I'm happy with the Eibach PRO kit on my 2025 Si. Don't plan to upgrade or change anything in regards to shocks/springs anymore.

And yeah I love these wheels. Konig Ampliform. Cheers!

How noisy are the springs? Any clunkiness from the suspension, especially the rears? I'm currently running 10th gen Swift Spec R springs and the rears are VERY noisy.

Thanks!

 

[Two Step Performance]

Prokit is typically stiffer. Sportlines a bit softer (with more drop)

Glad to hear you ended up liking it!

 

[Superhatch]

Prokit is typically stiffer. Sportlines a bit softer (with more drop)

Glad to hear you ended up liking it!

That's the opposite of all the data I've seen (granted this is only experience from EFs, EGs, EKs, and FL5s)

FL5 data below:

 

[Two Step Performance]

That's the opposite of all the data I've seen (granted this is only experience from EFs, EGs, EKs, and FL5s)

FL5 data below:

I always caution people from comparing dyno (power) measurements from different sources and a spring dyno would be not different however it may be fair to assume the Eibach data points both came from Eibach. If that is the case it is reasonable to assume they were tested the same way on the same dyno. My data was leaning more on 10th gen Civic experience. I’ve not yet reviewed any 11th gen Si data (matching the OPs car) from Eibach.

 

[Superhatch]

I always caution people

I mean, this is from their website. I don't know of any mfg that says their 'sport' spring is a harsher ride than their 'race' spring.

It's all subjective as to what one person thinks is too stiff, but if they put on the prokit, and then the sportline, the sportline should be stiffer.

I'm wondering if @SuperDave cut his bump stops? Not sure if that was asked yet or not.

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