Originally Posted by WoODStOcK

I actually have an email from them before I bought these springs. Here is the info on the differences. there is a picture attached let me upload it onto my photobucket and post it.


Hi Albert.

We really appreciate you looking into our Swift Spec R springs for the Evo. We have put a lot of effort into these springs, and we have received help from the most winning Super Taikyu teams that specializes in EVO’s in Japan to design these springs as well as rigorous track testing, so that we can come out with the most performance oriented product possible. We are extremely confident that you would like them.

As for the differences between the MR(4M017R) and the GSR(4M008R) springs. There is a slight difference between the GSR and the MR spring but it will be noticeable if they are installed. If you were to put an MR spring onto your GSR then the rear end will drop even lower by about 15-20 mill. And vice versa if you were to swap the GSR onto the MR.

When we tested the valving on the both MR and GSR shocks, the main differences were the gas pressures in the Bilstein shock for the MR. It has a fair amount higher pressure, which is like increasing the internal spring rate of the shock. This is why we designed the spring differently for the MR shock. It is not only the spring rates that were modified but the physical construction of the spring as well.

primary rate is as follows.

4M008R 3.50kgf/mm
4M017R 2.73kgf/mm

Most of our technical information is confidential , but here are a few numbers that I can show you.

Many other manufacturer’s have one set of springs for both MR and GSR and so it may seem like the springs can be swapped around but this is incorrect. Believe It or not rake angle dramatically affects the performance of a vehicle. We have come up with our setup through a lot of testing, and trial and error.

This paired with our technology and material used to make our spring, we expect an extremely comfortable ride with a good amount of performance gains.

I have attached pictures of the spring to show you at least the physical differences.

Best Regards,
Sales
Tel: (909)923-9788
Fax: (909)923-9798

Swift Springs
1850 S. Carlos Ave
Ontario, California 91761
www.SwiftSprings.com

Originally Posted by e_kobz

Swift Spec R's are amazing and I highly recommend them. I have them paired with Bilstein HD's on my Evo IX. There's a reason so many people run this combination. It makes the car handle significantly better.