MrHarris

iTrader: (1)

I got Fortune Auto 500 Coilovers installed. Car isn't slammed, just slightly lower than stock at the moment.

The guy who installed them said the general recommended settings are 2/3 stiffness front, 1/3 rear.

These coilovers have 24 adjustable stiffness settings, with 24 being the stiffest.

I configured my coilovers with Swift springs, 14k front, 10k rear. The car feels very similar to stock comfort settings and I thought it would feel stiffer.

What do you guys recommend as far as at least ratio goes for the stiffness in the front and for the rear given my spring stiffness settings i ordered and the weight distribution of the Lexus IS250?

WylieKylie

iTrader: (2)

I think you are probably going to have to do some experimentation yourself. I don't know of anyone else on these forums who has a set of Fortune Auto coilovers like yours.

Just a couple of general guidelines: Keep in mind that your shocks have digressive valving, so the idea is that they will eliminate body roll/brake dive while remaining comfortable over big bumps. So if you want stiffer, crank everything up a few notches and see what happens!

Since the weight distribution of a 2IS is near 50/50 the recommendations from the shop are probably pretty good as far as being 1-2 clicks different front to rear with the rear being softer. (This is assuming that the rear shocks are valved the same as the front, which I bet is a pretty safe assumption). So initially you should probably start with 1 click softer in the rear and play around with the overall stiffness and see what you like.

After you get a feel for how the settings affect the stiffness you can carefully deviate from the 1-2 click difference and see what you like.

MrHarris

iTrader: (1)

Weird, the guy who installed my coil overs said I should have it 2/3 the stiffness up front, and 1/3 rear. Since the car is 50/50, you recommend like two clicks softer in the rear?

Do you know the exact weight distribution?


I wonder how the Cusco 30mm front/19mm rear sway bars change the oversteer/understeer as well. I think the difference in stiffness for the dampening can have an effect as well right?

MrHarris

iTrader: (1)

Anyone know any tried and tested ratios of the stiffness front vs rear?


I'm at 21 front, 18 rear --- 24 is full stiff. The ride is surprisingly okay. Is it bad to run it this stiff? I plan to rebuild them every 60k miles like Fortune Auto recommends.

NorthStyle

iTrader: (16)

I run them on my GS430. I run 20 in front and 16 or 17 in rear. Stiff but still comfortable.

Sffd103

iTrader: (16)

My Megan LP's I ran a stiff as I could up front since I was slammed on 20's and a bit less in the rear. Just test them out and see how it feels.

KamiSpeed

iTrader: (1)

Swift springs will "feel softer" at the same spring rates as the regular BC Racing springs. The material Swift uses reacts to road conditions smoother and faster than the other companies.

So while your ride may feel soft. Your springs are reacting like a true 14k/10k spring should react. That is why if someone is ordering the Swift upgrade I like to bump them up 2k all around if they want that "stiffer" feel.