2025 Si vs regular Civic suspension part interchangeability

[jpollak]

This may sound like a crazy blasphemous question. But... are the rear shocks and springs and front strut/spring assemblies from standard 11th gen Civics interchangeable with the 2025 Civic Si suspension platform? Same dimensions, mounts, towers, etc? The local Honda service department simply said that they could not answer that question... I think that they might be given that Honda did away with the active dampers for the 2025 Si and it is a totally analog suspension. Our local roads are TERRIBLE and the 2025 Si springs are simply way too stiff for the environment that this car is operating in as a daily driver. I purchased a 2025 Civic Si really just for the engine and the transmission and because I like the 11th gen sedan platform. I used to drive a manual for 25 years and I deeply missed it. I am either going to find a solution to make this thing genuinely more compliant or I am going to sell it. This thing is AWESOME on a smooth twisty road... but most of our roads are not smooth and I am willing to give up cornering for daily reality... My other idea is to go to aftermarket 17" wheels with 235/45R17 tires, which would increase the sidewall height by 12% and would certainly improve matters and should just clear the large front calipers. Though swapping springs and shocks would certainly be the cheapest overall option and would be FAR cheaper than the loss taken to sell a basically new car. Anyone know the answer to this? Thank you in advance.

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[86salmon]

There are a couple options I can think of. The first is coilovers. You can set your dampening to be as smooth or stiff as you like situationally

Tein h tech springs. They do lower, but they're known to have a more compliant ride than even xgen SI springs

Coils will be sure to give you the best to suit whatever needs you may have, since I imagine some of your si ride is also from your factory dampers

Tein even has coilovers with edfc modules that allow for on the fly dampener stiffness adjustment

 

[AZCWTypeR]

Either here or on YouTube, I've seen other Si owners swapping out rear suspension parts with LX or Sport models. They did it for the same reason you mention. Avoid hybrid parts, since those cars are probably heavier.

I'm not sure how many miles you have, but shocks, springs, and bushings usually take a couple thousand miles to loosen up and settle in.

 

[V3N0M_VZL4]

TBH I was feeling the same when stock, for that reason I switched to coilovers the ride is smoother and I can drop the height of the suspension for better look and feedback, check out the Silvers coilovers after 3.5 years they are running like the day 1 without problems.

 

[nttran98]

Front are unique to Si (knuckle, ball joint and strut). Rear are close to identical (bushing diferences) I believe.

 

[TypeRD]

KW coil-overs always come highly recommended. They’re not cheap, but they will give you both better ride quality and handling quality. Can’t go wrong.

 

[jpollak]

Either here or on YouTube, I've seen other Si owners swapping out rear suspension parts with LX or Sport models. They did it for the same reason you mention. Avoid hybrid parts, since those cars are probably heavier.

I'm not sure how many miles you have, but shocks, springs, and bushings usually take a couple thousand miles to loosen up and settle in.

Yes, it is the rears I think that are the main culprit. It punches you in your back and rattles your head. It's a new car yes. A rear setup like this is important for handling on the limit, but I am not autocrossing, I "may" [yes] rip down a windy road now and then, but its a daily driver first. For shocks Monroe Part No: 5545 appears to be listed for all gas 11th gens. Does anyone know the Honda part number for the rear springs? It would probably cost less than $200 to test out this change... I don't want to lower the car so the aftermarket springs aren't going to work.

 

[86salmon]

Yes, it is the rears I think that are the main culprit. It punches you in your back and rattles your head. It's a new car yes. A rear setup like this is important for handling on the limit, but I am not autocrossing, I "may" [yes] rip down a windy road now and then, but its a daily driver first. For shocks Monroe Part No: 5545 appears to be listed for all gas 11th gens. Does anyone know the Honda part number for the rear springs? It would probably cost less than $200 to test out this change... I don't want to lower the car so the aftermarket springs aren't going to work.

Try looking for used OEM parts locally on marketplace and in the sales forum here and Civicx.com

You could probably find them for cheaper. You may even be able to find a base model owner who wants a performance boost, to trade springs with you

 

[jpollak]

Yeah I ended up ordering rear springs and shocks from an online salvage yard from a front crashed FE1 Touring. The FE1 platform is the old gas 180hp 1.5L turbo Touring and EX and the 200hp uprated Si. I figured the engineered weight distribution should be spot on pulling from another FE1, rather than taking from an FE2 sport with the 2L non turbo. The mounts for the shocks and the end caps/bushings for the springs all have the same part numbers. My only concern is that non Si Civics have a ride height that is 0.2" higher, so we shall see how the altered suspension settles out. The installation appears to be super super easy, especially as the shocks from the donner vehicle come with the old mounts so they don't need to be swapped over. In looking at videos looks like can do with very minimal suspension disassembly so may even be able to avoid an alinement. Maybe an hour or two of fiddling, easily reversible and cheep. Should be an interesting test. Part numbers are:

52441-T20-A11
52611-T20-A63

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