kk2

All of the gt4 spring threads I have found are related to the 981. I assume the dampers/springs are at least a bit different between the two generations. Is that assumption wrong?

Or does the 981 spring upgrade config carry over regardless of damper updates?

jwr9152

A few people have done swift springs on their 718 GT4s. You might do a search for swift spring if none of them chime in. But it seams like it is the same springs as on the 981.

mprog

I have Swift springs on my car. Goal was to make the car just a touch stiffer, paired with the DSC Sport Controller, for track days while not ruining the car on the street. I also wanted to keep the stock sway bars useful.

My rates f/r are 336/504. This is about 31% stiffer front, 10% stiffer rear.

I'm pretty happy with it! It's subtly stiffer and better controlled.

DR.S

Do you use the stock DSC file or modded for the stiffer springs?
Why did you chose this spring rate combo?

mprog

I use the stiffer / more track oriented calibration from TPC / DSC. I mean to start experimenting with the settings myself at some point too.

I chose the rates based on the following goals:
- SMALL change. I didn't want to go too stiff...
- I wanted to increase front rates vs rear rates, but not so much that I would make the inherent understeer of the car worse.

So I looked at % increases (guided also by past experiences with other cars), ratio of front to rear springs, and availability of rates from Swift, and settled on this.

Even though I only really drive the GT4 on the track, I really wanted to keep it civil on the streets. And I think I've accomplished that. I'm happy with it. The car is very well controlled.

kk2

What length springs f&r did you go with?

Porsche444

I did Swift springs and wow, transformed the car, soooo much better. With all the DSC research I did, you don’t need them honestly. Try Swift first and you will see for yourself.

dnimi123

Dont need what specifically?

Porsche444

skip the DSC controller. Try the Swift springs and you will see. I went to WSIR and beat my PB by 4 seconds, it’s an incredible change in setup

DC021

What length and I.D. Springs did you guys use?

I have some scca contingency springs I need to cash in on!

phefner

Like the idea. However, does this sort of upgrade see a higher probability of a strut tower failure?

kk2

It supposedly lowers the probability due to increased resistance to bottoming out and increased travel (assuming you get a longer main)

DC021

Do the factory springs bind before hitting the bump stops? Just trying to figure out how we are increasing travel assuming the same ride height.