What suspension do you suggest for my needs...?

[Who.Am.Eye.2716]

Having Nismo coilovers that were installed by a dealer is covered under Warranty. If the noise is occurring, you have the right to make them fix it. Or replace the faulty part. A noisy suspension is not normal and should be repaired on their dime.

Without someone actually hanging onto the bottom of the car while you drive, its a guessing game and they cant fix what they dont know the problem. And it doesn't sound like they can replicate it while the Z is on the lift. Sounds to me it's a load issue with the weight of the Z when going over bumps.

Another option that I have seen on YouTube is attach a GoPro type of camera on a control arm, or where you can secure on a suspension while you drive. You will need to make changes to the camera angles each time you drive. This is to get the video to show where the noise is coming from. Then provide this info to the dealer and move on with the repairs.

With coilovers, you can lower it more to reduce the wheel gap than what it is now. I read you like to set it and forget it. Me too.

With lowering springs, the most I have seen is 1"-1.2" depending on the brand. The gap will be similar to what you have it now with coilovers. This may or may not fit your vision.

Another option is to go with 20" wheels. That will fill the wheel gap and look closer to the fender. You will sacrifice ride comfort even more due to having shorter sidewalls. Might not be ideal for daily.

 

[iBattleMike]

I'm loving the HKS Hipermax S coilovers. I just stuck with the out of box settings and the drop is great for daily on these roads in Annapolis. Very comfortable, but stiffer than stock. Handles better now, no more feeling like I'm in a boat when I take off or stop. No noise etc. These are perfect for me.

I also got the Z1 fitment kit, 25mm rear - 20mm front spacers

 

[jacksonmagnet]

I’m on stock height, already scrapes a bunch on gas station ramps and pot holes, afraid to lower any more, would the new shocks help?

 

[Shumax]

I have all the stock NISMO suspension bits. I would have lowering springs added to those and installed. That’s why I started this thread - what springs would work on the stock NISMO dampers for a 2027, specifically?

i considered the HKS coilovers, but this experience is the third time, with two different vehicles, where I have had clunking issues with coilovers. Spooks me, as a result….

 

[Shumax]

I'm loving the HKS Hipermax S coilovers. I just stuck with the out of box settings and the drop is great for daily on these roads in Annapolis. Very comfortable, but stiffer than stock. Handles better now, no more feeling like I'm in a boat when I take off or stop. No noise etc. These are perfect for me.

I also got the Z1 fitment kit, 25mm rear - 20mm front spacers

Are those spec’d for a NISMO trim?

 

[trackratZ]

Swift Springs, been around, JDM designed meaning not too stiff, about 1" drop.

 

[iBattleMike]

Are those spec’d for a NISMO trim?

Not for the nismo. These would probably feel softer than nismo...I'd assume. but these are definitely an upgrade for the performance trim's suspension

 

[KrackaC8]

Swift Springs, been around, JDM designed meaning not too stiff, about 1" drop.

Swift is actually fairly new in the scheme of things. I put them on my Evo IX and hated them. More JDM hype than anything else, plus they're linear (not progressive) for the Z. Eibach or H&R is a better choice.

 

[FSUZ33]

Quality coilovers coupled with quality pre-install setup, quality install, quality supporting components and a good alignment can be a tremendously rewarding package, but they’re finicky. And regardless of how much you pay and take care of them, they’re still going to have a service interval (unless you swap cars/parts all the time. If I’m picking up what you’re putting down lowering springs are going to make you the happiest in the long run.

My $0.02: ARK doesn’t manufacture stuff. Outsourced to Asia. Not that it’s bad or they’re subpar, just saying.
Same with Whiteline, although they say their stuff is manufactured in Europe (possibly by one of the two below, I have zero clue).
Eibach, H&R (Germany) and Swift (Japan) all manufacture their own stuff in their own factories. I don’t believe there’s a marked difference between those three, but only one is typically regarded as a coilover spring upgrade from coilover companies like Aragosta, Fortune Auto and Sakebomb (Ohlins) and that’s Swift.

This is an AI-compiled comparison chart of the brands I know about that offer lowering springs for the RZ34.
Below in blue is copied/pasted rundown of each. I read t rough it but can't guarantee accuracy.

1. Swift (Spec-R Lowering Springs)

• Drop: Approx. 1.1" (28 mm) front and 1.1" (28 mm) rear. [1]
• Spring Rates: Front: 11.3 kg/mm (632 lbs/in) | Rear: 10.0 kg/mm (560 lbs/in). [1]
• Design: High-tensile H5S.TW proprietary steel alloy, engineered to use the upper limits of OEM shock valving. [1, 2]
• Characteristics:
  • Stiffest and most track-oriented option of the group, built for HPDE and SCCA-level response.
  • High spring rates offer minimal body roll and razor-sharp steering transition.
  • Some users note a firmer or busier ride on rough pavement compared to softer progressive options.
  • View product details at Swift Springs USA. [1, 2, 3]

2. Eibach (Pro-Kit)

• Drop: Approx. 1.0" (25 mm) front and 0.8" to 1.1" rear (depending on exact kit variation like Pro-Kit). [1, 2]
• Spring Rates: Front: 4.8 kg/mm (27 lbs/in equivalent/progressive ramp-up) | Rear: 5.6 kg/mm(mild/progressive setup). [1]
• Design: Progressive spring technology. [1]
• Characteristics:
  • Widely considered the gold standard for daily-driven street comfort while still lowering the center of gravity.
  • Reduces nose-dive under hard braking and excess body squat without being punishing over bumps.
  • Retains a very balanced, OEM-like compliance that won't prematurely exhaust factory dampers as fast as ultra-stiff track springs.
  • Learn more on the Eibach Official Release. [1, 2, 3]

3. ARK Performance (GT-S Lowering Springs)

• Drop: Approx. 1.15" (30 mm) front and 1.10" (28 mm) rear. [1, 2]
• Spring Rates: Front: 9.3 kg/mm | Rear: 10.5 kg/mm. [1]
• Design: Engineered for maximum usable stroke with factory struts; balanced linear/progressive mix. [1, 2]
• Characteristics:
  • Heavier rear spring rate relative to the front (unlike Swift which is stiffer front-heavy), which pairs well with stock or upgraded rear sway bar configurations.
  • Feedback from community members (such as discussions on Nissan Z Club) highlights a smooth reduction in bounciness compared to stock, with strong high-speed corner confidence and street-friendly composure. [1, 2]

4. H&R (Sport Springs)

• Drop: Approx. 1.0" to 1.4+" front and 1.0" to 1.6" rear (historically sits slightly lower/more aggressive in the rear depending on sub-variant). [1, 2]
• Design: Progressive-rate coil springs. [1]
• Characteristics:
  • Known for a more aggressive visual stance and a slightly firmer ride recovery over undulations.
  • Reduces body roll sharply and enhances dynamic load transfer, though slightly stiffer than Eibach Pro-Kit during everyday cruising.
  • Frequently paired with aftermarket dampers or checked closely for camber adjustments since lower drops can push front camber past -1.8° to -2.0°.
  • Check availability via Z1 Motorsports. [1, 2, 3, 4, 5]

5. Whiteline (Performance Lowering Springs)

• Drop: Typically 1.0" (25 mm) front and 1.38" (35 mm) rear (ported from their well-known Z34/370Z platform architecture). [1, 2]
• Spring Rates: Front: ~6.4–8.7 kg/mm | Rear: ~7.0–8.6 kg/mm (application dependent). [1, 2]
• Design: Progressive rate coil design manufactured to tight European tolerances. [1]
• Characteristics:
  • Gives a slightly larger rake or lower rear stance (e.g., ~35 mm rear drop) to level or aggressively pitch the car's profile.
  • Engineered specifically to balance grip activation with OEM shock longevity; often recommended to bundle with Whiteline sway bars for a complete package.
  • Specifications can be reviewed via Whiteline Performance. [1, 2]

 

[KrackaC8]

Whiteline is crap. Different story 20 years ago, but anything more recent is a hard pass.

 

[trackratZ]

Swift is actually fairly new in the scheme of things. I put them on my Evo IX and hated them. More JDM hype than anything else, plus they're linear (not progressive) for the Z. Eibach or H&R is a better choice.

It depends on the application and spring rates. I've used both Swifts and Eibach Pro-kit on different cars. In a way just because they're not progressive, doesn't mean they have less control and bouncy (that's the shock damping part). The Swift Spec-Rs I have now never bottom out even at 1.3g and not jarring stiff. Both are great companies, quality products.

 

[Shumax]

Quality coilovers coupled with quality pre-install setup, quality install, quality supporting components and a good alignment can be a tremendously rewarding package, but they’re finicky. And regardless of how much you pay and take care of them, they’re still going to have a service interval (unless you swap cars/parts all the time. If I’m picking up what you’re putting down lowering springs are going to make you the happiest in the long run.

My $0.02: ARK doesn’t manufacture stuff. Outsourced to Asia. Not that it’s bad or they’re subpar, just saying.
Same with Whiteline, although they say their stuff is manufactured in Europe (possibly by one of the two below, I have zero clue).
Eibach, H&R (Germany) and Swift (Japan) all manufacture their own stuff in their own factories. I don’t believe there’s a marked difference between those three, but only one is typically regarded as a coilover spring upgrade from coilover companies like Aragosta, Fortune Auto and Sakebomb (Ohlins) and that’s Swift.

This is an AI-compiled comparison chart of the brands I know about that offer lowering springs for the RZ34.
Below in blue is copied/pasted rundown of each. I read t rough it but can't guarantee accuracy.

1. Swift (Spec-R Lowering Springs)

• Drop: Approx. 1.1" (28 mm) front and 1.1" (28 mm) rear. [1]
• Spring Rates: Front: 11.3 kg/mm (632 lbs/in) | Rear: 10.0 kg/mm (560 lbs/in). [1]
• Design: High-tensile H5S.TW proprietary steel alloy, engineered to use the upper limits of OEM shock valving. [1, 2]
• Characteristics:
  • Stiffest and most track-oriented option of the group, built for HPDE and SCCA-level response.
  • High spring rates offer minimal body roll and razor-sharp steering transition.
  • Some users note a firmer or busier ride on rough pavement compared to softer progressive options.
  • View product details at Swift Springs USA. [1, 2, 3]

2. Eibach (Pro-Kit)

• Drop: Approx. 1.0" (25 mm) front and 0.8" to 1.1" rear (depending on exact kit variation like Pro-Kit). [1, 2]
• Spring Rates: Front: 4.8 kg/mm (27 lbs/in equivalent/progressive ramp-up) | Rear: 5.6 kg/mm(mild/progressive setup). [1]
• Design: Progressive spring technology. [1]
• Characteristics:
  • Widely considered the gold standard for daily-driven street comfort while still lowering the center of gravity.
  • Reduces nose-dive under hard braking and excess body squat without being punishing over bumps.
  • Retains a very balanced, OEM-like compliance that won't prematurely exhaust factory dampers as fast as ultra-stiff track springs.
  • Learn more on the Eibach Official Release. [1, 2, 3]

3. ARK Performance (GT-S Lowering Springs)

• Drop: Approx. 1.15" (30 mm) front and 1.10" (28 mm) rear. [1, 2]
• Spring Rates: Front: 9.3 kg/mm | Rear: 10.5 kg/mm. [1]
• Design: Engineered for maximum usable stroke with factory struts; balanced linear/progressive mix. [1, 2]
• Characteristics:
  • Heavier rear spring rate relative to the front (unlike Swift which is stiffer front-heavy), which pairs well with stock or upgraded rear sway bar configurations.
  • Feedback from community members (such as discussions on Nissan Z Club) highlights a smooth reduction in bounciness compared to stock, with strong high-speed corner confidence and street-friendly composure. [1, 2]

4. H&R (Sport Springs)

• Drop: Approx. 1.0" to 1.4+" front and 1.0" to 1.6" rear (historically sits slightly lower/more aggressive in the rear depending on sub-variant). [1, 2]
• Design: Progressive-rate coil springs. [1]
• Characteristics:
  • Known for a more aggressive visual stance and a slightly firmer ride recovery over undulations.
  • Reduces body roll sharply and enhances dynamic load transfer, though slightly stiffer than Eibach Pro-Kit during everyday cruising.
  • Frequently paired with aftermarket dampers or checked closely for camber adjustments since lower drops can push front camber past -1.8° to -2.0°.
  • Check availability via Z1 Motorsports. [1, 2, 3, 4, 5]

5. Whiteline (Performance Lowering Springs)

• Drop: Typically 1.0" (25 mm) front and 1.38" (35 mm) rear (ported from their well-known Z34/370Z platform architecture). [1, 2]
• Spring Rates: Front: ~6.4–8.7 kg/mm | Rear: ~7.0–8.6 kg/mm (application dependent). [1, 2]
• Design: Progressive rate coil design manufactured to tight European tolerances. [1]
• Characteristics:
  • Gives a slightly larger rake or lower rear stance (e.g., ~35 mm rear drop) to level or aggressively pitch the car's profile.
  • Engineered specifically to balance grip activation with OEM shock longevity; often recommended to bundle with Whiteline sway bars for a complete package.
  • Specifications can be reviewed via Whiteline Performance. [1, 2]

I appreciate the time you took on this - thank YOU! My biggest concern is finding a set of springs that will, for sure, fit the 2027 NISMO Manual. Though, I don't think the 'manual' has anything to do with it. I fear what I am running into is the car is simply too new for MFG's to have a product out yet and I don't want to be a guinea pig. As it stands, I may be paying $ to have the NISMO coilovers removed and the stock setup put back in, for now.

The dealer has two front, replacement, NISMO coilovers in and they go in tomorrow. So, I'll have a better idea of it all tomorrow.

Thanks again and have a good day!