Lowering Springs for Precision Package CT5-V Blackwing

[Paletero]

I recently picked up a 2025 CT5-V Blackwing with the Precision Package, and I’m currently looking into lowering spring options.

From what I’ve found so far, these are the three main options currently available:

Eibach PRO-KIT

Cadillac CT5-V PRO-KIT

Eibach engineers, manufactures, and sells the highest quality performance aftermarket suspension products in the world.

eibach.com

Swift Sport Lowering Springs

Swift Sport Lowering Springs - Tapout Tuning

Available for the following models: CT4-V, CT5-V, CT4-V Blackwing and CT5-V Blackwing. Engineered and manufactured by Swift Springs, these are designed to increase performance while keeping an OEM like ride. Designed around the useable stroke of the suspension, allowing you to lower the vehicle...

www.tapouttuning.com

Swift Spec-R Lowering Springs

Elite CT5-V Blackwing Swift "Spec-R" Lowering Springs by RP USA!

Our exclusive RP USA Swift "Spec-R" Lowering Springs. The "R" is for Racing! Unmatched aftermarket track suspension performance with street driveability!

www.refinedperformanceusa.com

However, from what I understand, all of these springs were developed for non-Precision Package Blackwings, but the Swift Spec-R springs are likely the closest match to the stiffer spring rates found in the Precision Package.

My main concern is I don’t want to downgrade the car’s handling by installing lowering springs that are softer or less capable than what comes with the Precision Package.

Do any of the current spring options have comparable spring rates to the Precision Package?

Is anyone currently working on lowering springs specifically for Precision Package Blackwings?

Appreciate any input especially from those who’ve tested or installed springs on a Precision Package car. Thanks!

 

[1Evil55]

Tuned coilovers is probably the only option to improving OEM IMO. I don't know of any manufacturers making them yet for the BW5 however.

 

[Bald Guy]

I would go for coilovers over springs. Springs are mostly cosmetic in my opinion and I don't recommend but that's just me. I wouldn't recommend spacers either since that's cosmetic as well.

 

[Champale]

OP - I know you aren't asking for our opinions about whether you should or should not put lowering springs on your car but the mag ride is so awesome I just can't imagine messing with the springs. I've used springs in the past and always regretted it (and always ended up with proper high quality KW coilovers that were great). Keep in mind that a lowering spring shortens the amount of up travel in the suspension since, at static height, the shock shaft sits higher up in the damper tube.

 

[Zephyr5V]

IMO you paid an extra $9k ($18k if you include the CCBs) for the best handling Blackwing, why would you throw that away by changing the variables for which it was tuned for?

 

[nordique14]

Suspension changes are a slippery slope. Lower the car and you affect the alignment and need shorted swaybar end links. Stiffen the springs and you might go outside the range the shock is meant to work with. You may also need to play with swaybars to keep the car so it maintains neutral handing.

If you just hate the wheel gap and the lowering springs are purely a cosmetic change then have at it. But realize you will likely make the handling of the car worse unless you are willing to try many different combinations of suspension components and settings until you find one that works.

 

[Argent86]

My main concern is I don’t want to downgrade the car’s handling by installing lowering springs that are softer or less capable than what comes with the Precision Package.

That's not your main concern.

 

[Savethemanuals]

Installing springs isn’t a “no return” modification. If you are keen on lowering it, install them, live with them for a while and if you don’t like them, go back to stock. Eibach vs swift… Personally it would come down to how much each lowers the car in front/back.

 

[Paletero]

That's not your main concern.

What's my main concern?

 

[Paletero]

IMO you paid an extra $9k ($18k if you include the CCBs) for the best handling Blackwing, why would you throw that away by changing the variables for which it was tuned for?

That's a valid point. I just didn't like the wheel gap, but I can live with it if lowering will to change the handling dynamics negatively.

 

[Kawman]

It would be nice if Cadillac came out with a Precision Package for the CT4 BW as well. Since they haven't, I'll assemble my own. I just ordered the sway bars and Swift Spec-R springs from Refined Performance.

The Refined Performance springs are 30% stiffer than OEM, while the Precision Package is 70% stiffer front and 60% rear than the standard CT5 BW. You don't feel nearly that much change due to other suspension changes in the package. I would guess that at this moment in time there are no better parts than what come in the car. In a year or two perhaps that might change.

If it's the gap that bothers you, what about bigger tires? Go from 275's to 285's in the front and from 305's to 315's in the rear. Both those changes make the tires 2 fifths of an inch taller. The gap between fender and tire would close by 1/5".

 

[Paletero]

It would be nice if Cadillac came out with a Precision Package for the CT4 BW as well. Since they haven't, I'll assemble my own. I just ordered the sway bars and Swift Spec-R springs from Refined Performance.

The Refined Performance springs are 30% stiffer than OEM, while the Precision Package is 70% stiffer front and 60% rear than the standard CT5 BW. You don't feel nearly that much change due to other suspension changes in the package. I would guess that at this moment in time there are no better parts than what come in the car. In a year or two perhaps that might change.

If it's the gap that bothers you, what about bigger tires? Go from 275's to 285's in the front and from 305's to 315's in the rear. Both those changes make the tires 2 fifths of an inch taller. The gap between fender and tire would close by 1/5".

That’s a great idea. Definitely something worth considering!

 

[Argent86]

What's my main concern?

Oh dyang, my internal filter blew a fuse

, sorry about that. I was thinking you'd be more concerned about looks. Nevermind that! I hope you do either the lowering or share your research. My main concern is same as you metioned!- would it mess up the stock setup.

Okay, I'm new to messing with the CT5-V. I've done springs on other older cars (but nothing as sophisticated/electronic) and it was totally worth it; slight lowering 1/2", slightly stiffer but quicker response. I live around the corner from H&R Springs but haven't looked to see if they spec for the Caddy.

Good luck with it!
R

 

[Argent86]

It would be nice if Cadillac came out with a Precision Package for the CT4 BW as well. Since they haven't, I'll assemble my own. I just ordered the sway bars and Swift Spec-R springs from Refined Performance.

The Refined Performance springs are 30% stiffer than OEM, while the Precision Package is 70% stiffer front and 60% rear than the standard CT5 BW. You don't feel nearly that much change due to other suspension changes in the package. I would guess that at this moment in time there are no better parts than what come in the car. In a year or two perhaps that might change.

If it's the gap that bothers you, what about bigger tires? Go from 275's to 285's in the front and from 305's to 315's in the rear. Both those changes make the tires 2 fifths of an inch taller. The gap between fender and tire would close by 1/5".

Excellent stuff! I plan on keeping my 2024 CT5-V manual but If they do a CT4 BW Automatic, Precison Package, I'd have to look into that as an additonal ride. CT5 stays,

 

[BKC1]

I have measured the ATS-V and CT4-V BW spring rates and designed a custom set of adjustable perches that do not change the OEM rate. My design uses Swift metric springs over the OEM damper, and provide an extra 20mm of front tire clearance inboard, plus 1.5" of height adjustment for a given spring. Lots of small vendor parts involved; overall cost is around $900 including the Swift springs and adjustable perches which are the majority of the cost. Weight is about a pound less per corner.

I could do the same for the CT5-V BW, but I'm not interested in spending the money on another set of springs, dampers, and control arms (even used, it's a lot of money). If you guys are interested in this type of stuff, let me know. What I've done is not that innovative--the real next step is getting the DSC Sport controller tuned for different spring rates, so that we can have better handling without impacting ride quality.