Spoon Springs for DE4 Integra

[greyspec]

Suspension nerd question: does anyone know the spring rates of the stock DE4 1.5T Integra springs? Are they the same as the 11th gen Civic Si? I'm having trouble getting solid info online

Spoon makes springs for the FE1 Civic but they aren't sold on blackhawkjapan. Spoon USA sells them but importing them to Canada will be extremely expensive (paying in USD+customs). I want to see how the Spoon FL1 spring rates compare to our DE4 Integra spring rates. I may consider getting the Spoon FL1 Civic springs. I'm quite certain fitment isn't an issue, someone in the blackhawkjapan reviews of the Spoon FL1 springs confirms they fit the FE1 Civic Si, and I know from other brands that any springs that fit the Si will fit the Integra. My question is around the spring rates and any unexpected differences in the car's behaviour as a result

OEM JDM FL1 Hatch F: 2.7kgf/mm, 155in/lb R: 2.8kgf/mm, 156in/lb

OEM USDM Si F: 2.7kgf/mm, 155in/lb
R: 5.7kgf/mm, 320in/lb

Spoon Sports FL1 springs F: 3.4kgf/mm, 190in/lb
R: 3.4kgf/mm, 190in/lb

Spoon Sports FE1 springs: Front:3.4 kgf/mm , Rear:4.5 kgf/mm

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[ryanDE5 Gman]

should work
https://www.evasivemotorsports.com/?srsltid=AfmBOopa1L_a3ZGsCUTXFOPrRLhtLJJgrVjvqo5Z95cqSgCCBoEg5zDb

Or
https://unity-performance.com/?srsltid=AfmBOopp3kSxdMuTB9gKsu1I24FYM1LWF4tpR7KL1bonukqY83onjv0P

I believe they have shops in Canada.

 

[Unity Performance]

Suspension nerd question: does anyone know the spring rates of the stock DE4 1.5T Integra springs? Are they the same as the 11th gen Civic Si? I'm having trouble getting solid info online

Spoon makes springs for the FE1 Civic but they aren't sold on blackhawkjapan. Spoon USA sells them but importing them to Canada will be extremely expensive (paying in USD+customs). I want to see how the Spoon FL1 spring rates compare to our DE4 Integra spring rates. I may consider getting the Spoon FL1 Civic springs. I'm quite certain fitment isn't an issue, someone in the blackhawkjapan reviews of the Spoon FL1 springs confirms they fit the FE1 Civic Si, and I know from other brands that any springs that fit the Si will fit the Integra. My question is around the spring rates and any unexpected differences in the car's behaviour as a result

OEM JDM FL1 Hatch F: 2.7kgf/mm, 155in/lb R: 2.8kgf/mm, 156in/lb

OEM USDM Si F: 2.7kgf/mm, 155in/lb
R: 5.7kgf/mm, 320in/lb

Spoon Sports FL1 springs F: 3.4kgf/mm, 190in/lb
R: 3.4kgf/mm, 190in/lb

Spoon Sports FE1 springs: Front:3.4 kgf/mm , Rear:4.5 kgf/mm

We can definitely bring FL1 Springs from Spoon USA to our Toronto location if you'd like

https://unity-performance.com/produ...gs-22-civic-hatch?_pos=2&_sid=1e1e0fa17&_ss=r

 

[greyspec]

We can definitely bring FL1 Springs from Spoon USA to our Toronto location if you'd like

https://unity-performance.com/produ...gs-22-civic-hatch?_pos=2&_sid=1e1e0fa17&_ss=r

Would your guess be that the Spoon FL1 springs would be noticeably more comfortable than the stock FE1/DE4 suspension but still give better handling? The part that makes me think twice is the significantly lower rear spring rate

 

[DE4Willyyyy]

Would your guess be that the Spoon FL1 springs would be noticeably more comfortable than the stock FE1/DE4 suspension but still give better handling? The part that makes me think twice is the significantly lower rear spring rate

The FE1 and DE4 spring rates are a lot more different then you might think. FE1 spring rates comes in at ~252 lbs/in (4.5 kg/mm) front, with the rears being the same as the DE4 at ~319 lbs/in (5.7 kg/mm).

DE4 front spring rates comes in at ~155 lbs/in (2.7 kg/mm).

The 11th gen Civic Si is noticeably stiffer with less body roll, as compared to the Integra which is softer.



He doesnt talk about the spring rates specifically, but talks about how the Civic Si is more jarring on bad roads, whereas the Integra handles bad roads with a lot more compliance.

Swift springs, from what I've researched, are closest to the OEM spring rates while dropping it 1.25 inches front, 1.1 inches rear. I was gonna go Spoon springs myself, but I decided I wanted a little bit of a more drop.

However, I do notice that Spoon springs for FE1/DE4 has a softer rear spring rate compared to OEM. It might be more of a comfortable ride compared to Swift springs?

But any springs that aren't OEM will be harsher than OEM. Really depends on how much comfort you're willing to trade off for a lower ride height.

I would also like to note that a softer rear spring rate compared to OEM is probably less than preferable if you plan to track or do lots of spirited driving on windy roads. It's more ideal to have stiffer rates on the front while maintaining close to OEM rates in the rear, not softer. It's just more compliant and reduces understeer that way.

 

[greyspec]

The FE1 and DE4 spring rates are a lot more different then you might think. FE1 spring rates comes in at ~252 lbs/in (4.5 kg/mm) front, with the rears being the same as the DE4 at ~319 lbs/in (5.7 kg/mm).

DE4 front spring rates comes in at ~155 lbs/in (2.7 kg/mm).

The 11th gen Civic Si is noticeably stiffer with less body roll, as compared to the Integra which is softer.



He doesnt talk about the spring rates specifically, but talks about how the Civic Si is more jarring on bad roads, whereas the Integra handles bad roads with a lot more compliance.

Swift springs, from what I've researched, are closest to the OEM spring rates while dropping it 1.25 inches front, 1.1 inches rear. I was gonna go Spoon springs myself, but I decided I wanted a little bit of a more drop.

However, I do notice that Spoon springs for FE1/DE4 has a softer rear spring rate compared to OEM. It might be more of a comfortable ride compared to Swift springs?

But any springs that aren't OEM will be harsher than OEM. Really depends on how much comfort you're willing to trade off for a lower ride height.

I would also like to note that a softer rear spring rate compared to OEM is probably less than preferable if you plan to track or do lots of spirited driving on windy roads. It's more ideal to have stiffer rates on the front while maintaining close to OEM rates in the rear, not softer. It's just more compliant and reduces understeer that way.

Interesting, my research had the USDM FE1 Si spring rates as what you've mentioned for the DE4. If your FE1 spring rates are correct, it means Spoon made their FE1 springs have a lower spring rate front and rear, which would be interesting.

On my DE4 I have an upgraded rear sway which helps with the understeer, along with a strut bar, front lower chassis brace and rear lower chassis brace. I keep the dampers in comfort mode. In this setting I feel like the front leans a bit too much and the front tires lose ideal contact patch, and the rear suspension can be a little bit jarring over coarse cracks in the road. The Spoon springs might appeal to me to stiffen the front, soften the rear for more comfort and then I can dial up the dampers as needed. I'm also considering the H&R springs because they're also a progressive design but they don't declare their spring rates. I know in the FL5/DE5 world a lot of people say the Spoon springs are more comfortable than OEM, that's what I'm going for

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