This post brings me back to the Fox body days...Tremec 6spd was the end-all-be-all mod.
And yes, I’d still like to have one. Let’s see who jumps (or has already jumped) on the grenade first to retrofit one of these into a GT.
B6s — they are designed for OEM spring rates (and can handle more).
I’m not tracking other series available yet for the S550 outside of the full B16 suspension kit. If B8s ever come out, I would recommend these for lower ride height and higher spring rate cars.
Ford hasn’t released data that I know of, so it’s all guess work. The video I posted earlier has the Ford engineer who designed the X-spring state (paraphrasing), “they are slightly stiffer than OEM PP springs.” I think it’s safe to assume the Y springs fall in a similar scenario; just over...
Y springs are similar in rates to OEM GT350 (non-R) springs, while X springs are similar in rates to OEM PP springs.
In your case, I wouldn’t jump ship from your street-pack dampers; give them some miles, then upgrade dampers when due.
When it’s time, I would pair Bilsteins with the X springs...
The Ford Performance Track Kit is very good for those who want a bit more of an aggressive street setup.
High performance summer tires driven in a New Jersey winter is likely the main cause. Also, go to a trusted alignment center and ensure you have 0.00 to 0.05 toe-in on each front wheel...
My gripe with the OEM PP dampers is a lack of longevity and balance. My PP monotube shocks leaked badly at about 8k miles. The (subjective) balance in turns was never quite right...it was floaty as well.
The PP spring rates, as well as the FP X Street Springs, are at an excellent rate and...
100% yes, changing your OEM PP dampers to Bilsteins, FRPP Track dampers, or the like will pay big dividends. Going to the X-Spring when swapping dampers saves on labor — a 1” drop and no risk of a butchered ride quality makes them a safe choice.
Get the street springs, but pair with Bilsteins. Excellent combo for a street car.
FP Street and Track springs are indeed linear. The fronts are purely linear, the rears have a helper portion tied to the active linear portion. Here’s the Ford engineer who designed these springs (go to 2min):
You’ll be fine with the 285/295 35 19 Steeda Progressive combination, and the 285 PS4S on a 10” wheel is perfect (I have 275s on a 10” and they are a touch too stretched imo).
0.00 to 0.05 toe-in per front wheel
Choose your own front camber with MM plates, but staying at, or just...
I was always a bit envious seeing clear tails on S550s when living in Europe...I decided to bring the clean look to my US spec:
Overall, super easy install (30min) with a big visual impact. Sequential function retained and D.O.T. legal. If you like the look, I highly recommend,