The OEM+/Comfort S Sedan Coilover Thread
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Another factor here: the base/Journey OEM springs are expensive. 4 new OEM springs run $1300.
Front: https://www.z1motorsports.com/front-...d-p-13638.html
Rear: https://www.z1motorsports.com/rear-s...d-p-13660.html
Add in shocks/struts, and you are looking at $1800. https://www.z1motorsports.com/shock-...t-p-17210.html
Depending on what someone chooses, decent coilovers are cheaper
Front: https://www.z1motorsports.com/front-...d-p-13638.html
Rear: https://www.z1motorsports.com/rear-s...d-p-13660.html
Add in shocks/struts, and you are looking at $1800. https://www.z1motorsports.com/shock-...t-p-17210.html
Depending on what someone chooses, decent coilovers are cheaper
Any thoughts on the TEIN EnduroPro Plus dampers? Looks like I may be a pioneer running these...
I also called KYB and their product support was essentially someone reading from the website. TEIN's support was impressive.
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Interesting. I understood, with Swift Springs, that 8" front and rear would be needed to start out at stock height. So 7" front and 9" rear don't seem to jive, unless it's does a difference in how Swifts settle vs FA springs. And the rear stiffness seems low at 5K-6K....Why did they recommend this low number? Thanks.
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Interesting. I understood, with Swift Springs, that 8" front and rear would be needed to start out at stock height. So 7" front and 9" rear don't seem to jive, unless it's does a difference in how Swifts settle vs FA springs. And the rear stiffness seems low at 5K-6K....Why did they recommend this low number? Thanks.
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@bdlpe1 Ah, thanks for clarifying. The 7" front and 9" spring rear with a rear spring rate of 5k-6k refers to converting to a true-coilover from the OEM divorced setup. Changing the location of the spring changes how much leverage the spring is under, thus a different spring rate is required. The true-coilover setup FA recommended to me was with their springs.
As far as the length of spring required, I am not an expert here, but just going off of what I've learned from searching the forum. There are multiple posts about needing 8" springs (divorced) in the rear of a G37 to avoid the rear being too low. I haven't seen any posts that talk about the front being too low. They may be out there, but if they are, I haven't seen them. Here is a good example: https://www.myg37.com/forums/brakes-...l-too-low.html
The other thing I'll add is that from all my research, it seems critical to communicate directly with your coilover company to discuss your goals and then order specifically what you need. If you just order the default setup you may well be unhappy.
As far as the length of spring required, I am not an expert here, but just going off of what I've learned from searching the forum. There are multiple posts about needing 8" springs (divorced) in the rear of a G37 to avoid the rear being too low. I haven't seen any posts that talk about the front being too low. They may be out there, but if they are, I haven't seen them. Here is a good example: https://www.myg37.com/forums/brakes-...l-too-low.html
The other thing I'll add is that from all my research, it seems critical to communicate directly with your coilover company to discuss your goals and then order specifically what you need. If you just order the default setup you may well be unhappy.
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Another update, inspired by @socketz67 I picked up the phone and called Swift. I see they list a ton of metric springs on their website, so I asked if they had a spring that would allow me to maintain an OEM-ish ride height, and the answer was no. They suggested going the coilover route.
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I think I have found my coilovers - Powertrix Sport Street coilovers. I have spoken with the owner, Charles, via email and phone, and I think these are exactly what I am after. These coilovers will allow an OEM-ish ride height on sedans, and should be "very compliant for daily driving with the family" and "feedback from customers is 'rides just as good, if not better than stock.'" They also have more hardcore options for those wanting to track their cars. Powertix is a relatively small company, primarily making coilovers for Nissan and Infiniti cars.
The spring rate is 12k/10k (divorced), which initially concerned me. However, Charles explained that the spring rate and damper specs need to be properly matched to achieve the desired ride quality. Lower spring rates in a coilover can actually cause a worse ride, as the suspension can bottom out too soon. They have specifically matched their dampers and spring rates for our chassis and use. This makes sense, and I've ran into this in the dirt bike world. A harsh fork can be a spring that is too stiff OR too soft. When the springs are too soft, you end up sitting in the stiffer part of the damping, resulting in harshness. They also offer Swift springs, which Charles said ride noticeable better than the stock Powertrix springs. Just about everything I read about Swift springs say they are worth it.
These coilovers are $1700 with the Swift upgrade. They are made in Korea to Powertrix specifications. Rebuildable, zinc-coated, and come with upper mounts.
I like supporting companies that are specifically supporting the Nissan world. Plus, it's cool to interact directly with the owner who knows the cars and product so well.
https://www.powertrix.com/component/...34ss1?Itemid=0
The spring rate is 12k/10k (divorced), which initially concerned me. However, Charles explained that the spring rate and damper specs need to be properly matched to achieve the desired ride quality. Lower spring rates in a coilover can actually cause a worse ride, as the suspension can bottom out too soon. They have specifically matched their dampers and spring rates for our chassis and use. This makes sense, and I've ran into this in the dirt bike world. A harsh fork can be a spring that is too stiff OR too soft. When the springs are too soft, you end up sitting in the stiffer part of the damping, resulting in harshness. They also offer Swift springs, which Charles said ride noticeable better than the stock Powertrix springs. Just about everything I read about Swift springs say they are worth it.
These coilovers are $1700 with the Swift upgrade. They are made in Korea to Powertrix specifications. Rebuildable, zinc-coated, and come with upper mounts.
I like supporting companies that are specifically supporting the Nissan world. Plus, it's cool to interact directly with the owner who knows the cars and product so well.
https://www.powertrix.com/component/...34ss1?Itemid=0
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Joined: Aug 2012
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Interesting. I understood, with Swift Springs, that 8" front and rear would be needed to start out at stock height. So 7" front and 9" rear don't seem to jive, unless it's does a difference in how Swifts settle vs FA springs. And the rear stiffness seems low at 5K-6K....Why did they recommend this low number? Thanks.
I run Swifts on a RWD and they settle .3-.4 inches lower than their advertised drop. Not really an issue if you run adjustable UCAs in the front and adjustable camber arms with toe bolts in the rear. Almost any drop will require these components to maintain factory alignment specs.
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Joined: Aug 2012
Posts: 2,913
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From: San Diego, CA
I think I have found my coilovers - Powertrix Sport Street coilovers. I have spoken with the owner, Charles, via email and phone, and I think these are exactly what I am after. These coilovers will allow an OEM-ish ride height on sedans, and should be "very compliant for daily driving with the family" and "feedback from customers is 'rides just as good, if not better than stock.'" They also have more hardcore options for those wanting to track their cars. Powertix is a relatively small company, primarily making coilovers for Nissan and Infiniti cars.
The spring rate is 12k/10k (divorced), which initially concerned me. However, Charles explained that the spring rate and damper specs need to be properly matched to achieve the desired ride quality. Lower spring rates in a coilover can actually cause a worse ride, as the suspension can bottom out too soon. They have specifically matched their dampers and spring rates for our chassis and use. This makes sense, and I've ran into this in the dirt bike world. A harsh fork can be a spring that is too stiff OR too soft. When the springs are too soft, you end up sitting in the stiffer part of the damping, resulting in harshness. They also offer Swift springs, which Charles said ride noticeable better than the stock Powertrix springs. Just about everything I read about Swift springs say they are worth it.
These coilovers are $1700 with the Swift upgrade. They are made in Korea to Powertrix specifications. Rebuildable, zinc-coated, and come with upper mounts.
I like supporting companies that are specifically supporting the Nissan world. Plus, it's cool to interact directly with the owner who knows the cars and product so well.
https://www.powertrix.com/component/...34ss1?Itemid=0
The spring rate is 12k/10k (divorced), which initially concerned me. However, Charles explained that the spring rate and damper specs need to be properly matched to achieve the desired ride quality. Lower spring rates in a coilover can actually cause a worse ride, as the suspension can bottom out too soon. They have specifically matched their dampers and spring rates for our chassis and use. This makes sense, and I've ran into this in the dirt bike world. A harsh fork can be a spring that is too stiff OR too soft. When the springs are too soft, you end up sitting in the stiffer part of the damping, resulting in harshness. They also offer Swift springs, which Charles said ride noticeable better than the stock Powertrix springs. Just about everything I read about Swift springs say they are worth it.
These coilovers are $1700 with the Swift upgrade. They are made in Korea to Powertrix specifications. Rebuildable, zinc-coated, and come with upper mounts.
I like supporting companies that are specifically supporting the Nissan world. Plus, it's cool to interact directly with the owner who knows the cars and product so well.
https://www.powertrix.com/component/...34ss1?Itemid=0
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Joined: Aug 2012
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From: San Diego, CA
Lowering
Front: -1.2 Inch, plus .3" settling or 1.5" total.
Rear: -0.8 Inch, plus .3" settling or 1.1" total.
You prefer just a 1"drop in the front. I could have sworn TEIN made springs for our cars early on that were more conservative than the S and H Techs available today.
370Z springs are shorter, so maybe they'd give you the ride height you want?
Swifts are the ideal drop on AWDs, but they do settle a little low on the RWD sport sedan.
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Joined: Nov 2021
Posts: 10
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I think I have found my coilovers - Powertrix Sport Street coilovers. I have spoken with the owner, Charles, via email and phone, and I think these are exactly what I am after. These coilovers will allow an OEM-ish ride height on sedans, and should be "very compliant for daily driving with the family" and "feedback from customers is 'rides just as good, if not better than stock.'" They also have more hardcore options for those wanting to track their cars. Powertix is a relatively small company, primarily making coilovers for Nissan and Infiniti cars.
The spring rate is 12k/10k (divorced), which initially concerned me. However, Charles explained that the spring rate and damper specs need to be properly matched to achieve the desired ride quality. Lower spring rates in a coilover can actually cause a worse ride, as the suspension can bottom out too soon. They have specifically matched their dampers and spring rates for our chassis and use. This makes sense, and I've ran into this in the dirt bike world. A harsh fork can be a spring that is too stiff OR too soft. When the springs are too soft, you end up sitting in the stiffer part of the damping, resulting in harshness. They also offer Swift springs, which Charles said ride noticeable better than the stock Powertrix springs. Just about everything I read about Swift springs say they are worth it.
These coilovers are $1700 with the Swift upgrade. They are made in Korea to Powertrix specifications. Rebuildable, zinc-coated, and come with upper mounts.
I like supporting companies that are specifically supporting the Nissan world. Plus, it's cool to interact directly with the owner who knows the cars and product so well.
https://www.powertrix.com/component/...34ss1?Itemid=0
The spring rate is 12k/10k (divorced), which initially concerned me. However, Charles explained that the spring rate and damper specs need to be properly matched to achieve the desired ride quality. Lower spring rates in a coilover can actually cause a worse ride, as the suspension can bottom out too soon. They have specifically matched their dampers and spring rates for our chassis and use. This makes sense, and I've ran into this in the dirt bike world. A harsh fork can be a spring that is too stiff OR too soft. When the springs are too soft, you end up sitting in the stiffer part of the damping, resulting in harshness. They also offer Swift springs, which Charles said ride noticeable better than the stock Powertrix springs. Just about everything I read about Swift springs say they are worth it.
These coilovers are $1700 with the Swift upgrade. They are made in Korea to Powertrix specifications. Rebuildable, zinc-coated, and come with upper mounts.
I like supporting companies that are specifically supporting the Nissan world. Plus, it's cool to interact directly with the owner who knows the cars and product so well.
https://www.powertrix.com/component/...34ss1?Itemid=0
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Joined: Dec 2019
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From: Chicago, IL
Take a look into Annex coilovers, they are a small company that makes custom quality coilovers that don't sacrifice ride quality.
https://annexsuspension.com/infiniti...sedan-g35-rwd/
Here's some great information around the company:
https://annexsuspension.com/infiniti...sedan-g35-rwd/
Here's some great information around the company:
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Joined: Aug 2012
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From: San Diego, CA
Another update, inspired by @socketz67 I picked up the phone and called Swift. I see they list a ton of metric springs on their website, so I asked if they had a spring that would allow me to maintain an OEM-ish ride height, and the answer was no. They suggested going the coilover route.
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FYI - PowerTrix SS coilovers are on sale. There is also a pre-order option for delivery in March/April, which is perfect for me. I am not looking to install until the spring since winter is starting here. I placed my order this morning.
https://powertrix.com/component/jsho...-sale?Itemid=0
https://powertrix.com/component/jsho...-sale?Itemid=0
