Coil Springs (specs v build)

[Miltz]

Hi,

I've just read through this entire thread, plenty of good information, especially the table showing spring rate as N/mm for the various OEM spring options

Has anyone been able to find out the specs (other than rate) for the various standard springs and also the various +30-40mm Eibach springs, e.g.
- ID (internal diameter of the spring windings)
- OD (outside diameter of the spring windings)
- Free length (total uncompressed length)
- Maximum spring compression (how much the free length reduces once the spring is compressed to binding point)
- Spring rates of the 30-40mm Eibach springs

I'm looking to have some custom suspension put together by a local manufacturer and this will help get a base line. Idea is front will be similar to the Heavy Duty +30-40mm Eibach springs (+100KG). Rear may sit half way between the Heavy Duty (+200KG) and Extra Heavy Duty (+400KG), I plan on running airbags for for heavily loaded (some extra air added) trips and towing (more air added again), but even when not using airbags to support the weight (the car will easily lose 200KG constant weight over the rear when being used day to day) they need some pressure left in them which adds to the spring rate. This will be up to them to work out, especially as airbags act as a progressive spring, the rear springs may need to be less progressive than the factory option/Eibach springs to work best with airbags.

Dampers I will have tuned as stock, I've been really happy with them, just want some extra oil volume to help keep them cooler after hours of corrugations.


Cheers,

 

[Znarfgh]

Hi,

I've just read through this entire thread, plenty of good information, especially the table showing spring rate as N/mm for the various OEM spring options

Has anyone been able to find out the specs (other than rate) for the various standard springs and also the various +30-40mm Eibach springs, e.g.
- ID (internal diameter of the spring windings)
- OD (outside diameter of the spring windings)
- Free length (total uncompressed length)
- Maximum spring compression (how much the free length reduces once the spring is compressed to binding point)
- Spring rates of the 30-40mm Eibach springs

I'm looking to have some custom suspension put together by a local manufacturer and this will help get a base line. Idea is front will be similar to the Heavy Duty +30-40mm Eibach springs (+100KG). Rear may sit half way between the Heavy Duty (+200KG) and Extra Heavy Duty (+400KG), I plan on running airbags for for heavily loaded (some extra air added) trips and towing (more air added again), but even when not using airbags to support the weight (the car will easily lose 200KG constant weight over the rear when being used day to day) they need some pressure left in them which adds to the spring rate. This will be up to them to work out, especially as airbags act as a progressive spring, the rear springs may need to be less progressive than the factory option/Eibach springs to work best with airbags.

Dampers I will have tuned as stock, I've been really happy with them, just want some extra oil volume to help keep them cooler after hours of corrugations.


Cheers,

Finding specs might be challenging.

I have, in the past, measured the compressed length of my springs and then removed them form the vehicle. I took them to a local spring maker and told him how much weight I was carrying and how much of a lift I wanted. The spring maker should be able to figure out the poundage of the original and worked out the length and other data of the new spring.

I believe there has been an update on the springs since the start and one of these charts was sent to me by Ineos. Rear free length is around 550mm

 

[Clark Kent]

Hi,

I've just read through this entire thread, plenty of good information, especially the table showing spring rate as N/mm for the various OEM spring options

Has anyone been able to find out the specs (other than rate) for the various standard springs and also the various +30-40mm Eibach springs, e.g.
- ID (internal diameter of the spring windings)
- OD (outside diameter of the spring windings)
- Free length (total uncompressed length)
- Maximum spring compression (how much the free length reduces once the spring is compressed to binding point)
- Spring rates of the 30-40mm Eibach springs

I'm looking to have some custom suspension put together by a local manufacturer and this will help get a base line. Idea is front will be similar to the Heavy Duty +30-40mm Eibach springs (+100KG). Rear may sit half way between the Heavy Duty (+200KG) and Extra Heavy Duty (+400KG), I plan on running airbags for for heavily loaded (some extra air added) trips and towing (more air added again), but even when not using airbags to support the weight (the car will easily lose 200KG constant weight over the rear when being used day to day) they need some pressure left in them which adds to the spring rate. This will be up to them to work out, especially as airbags act as a progressive spring, the rear springs may need to be less progressive than the factory option/Eibach springs to work best with airbags.

Dampers I will have tuned as stock, I've been really happy with them, just want some extra oil volume to help keep them cooler after hours of corrugations.


Cheers,

JRace are doing custom springs for Grenadier for an upcoming lift kit. The springs are made by Eibach to JRace's own specs. That's not an answer to your question but it might be worth a chat. No need to reinvent the wheel if they have something suitable in the pipeline.

JRace Industries in Townsville

 

[Miltz]

Finding specs might be challenging.

I have, in the past, measured the compressed length of my springs and then removed them form the vehicle. I took them to a local spring maker and told him how much weight I was carrying and how much of a lift I wanted. The spring maker should be able to figure out the poundage of the original and worked out the length and other data of the new spring.

View attachment 7914602View attachment 7914603View attachment 7914604
I believe there has been an update on the springs since the start and one of these charts was sent to me by Ineos. Rear free length is around 550mm

Thanks for compiling all of this! Looks like these tables are all for the standard spring options?

 

[Znarfgh]

Thanks for compiling all of this! Looks like these tables are all for the standard spring options?

Yes, they are but it gives you an idea of the specs and gives you something to work on, the spring maker can work out the rest.

 

[Miltz]

JRace are doing custom springs for Grenadier for an upcoming lift kit. The springs are made by Eibach to JRace's own specs. That's not an answer to your question but it might be worth a chat. No need to reinvent the wheel if they have something suitable in the pipeline.

JRace Industries in Townsville

I've seen that on Instagram, and don't doubt what they can do, their work looks really good! There's a few other options, international (to AUS) and national that are putting out some good kit too! I'm just trying to work local and get things customised a little more.

JRace are doing custom springs for Grenadier for an upcoming lift kit. The springs are made by Eibach to JRace's own specs. That's not an answer to your question but it might be worth a chat. No need to reinvent the wheel if they have something suitable in the pipeline.

JRace Industries in Townsville

Big thing I want to avoid is the need for any new suspension/steering arms, camber correction etc. Don't want a big lift, or a GVM upgrade. But if something fails I want to be able to replace it with an OEM component I have lying around or from a service centre on the spot.

While this car is our touring rig and more than occasional rock crawler/dune runner, it's also my daily driver that I use for work, need to be able to keep it on the road no matter what!