The 800 pound rear spring, plus the wing, and 500 pound front spring is a great combination. The car is really sure footed. A crazy amount of mechanical grip, actually. The weakest part of the car now is tires. Thinking of trying the RE-71A. I know they’ll only last 6 track days.
Great to hear. What spring rate is the stock spring.
Like 200 progressive.
Also, I’m going to toe out the front wheels to -1/16 total. Somehow I lost that setting. And pair it up with RE-71R tires this time, just to try something different. I think they are 3-4 pounds heavier per tire, about $100 cheaper, and allegedly have 2/3 the track life. I usually run the Michelin Cup2.
WOW that’s a big difference in spring rate.
It’s sprung very soft for rear seat passenger comfort. I think the aftermarket street kits are like 300 progressive.
Are you getting even tread ware on the car with it set up that way
West, do you know what spring rate your helper/tender springs are?
I started out running 7" springs with no helpers on my m3, then added the Swift 168 lbs/inch helpers up front and went to 6" springs. I’ve just removed the helpers and the car feels more connected without them, you might give this a try. Most folks running helpers are running near 0 rates, but I wanted to try something different thinking it might increase street comfort, wasn’t really worth it. If you are closer to 0 rate you may not feel any difference.
I believe this is the toe link I’m replacing. I just figure the bushings are shot. I tried to order this part with spherical bearings but they don’t sell it and couldn’t custom build it for me. I asked a few times.
I think the front tender spring is like 100 and the main spring 500. I don’t think there is a rear tender spring, just an 800 main spring.
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Forgot there is a helper spring in back
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The arm we are replacing
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The old arm is hollow and super light weight. New ones are heavier for sure.
We’ll try a bit of toe out on the rear this time.
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so were they shot? I cant tell from the pics
Shot isn’t the right word. Just old. Nobody really needs to replace it. I just figured a bushing from 2009 ain’t so great.
The rear toe out setup is working great. The car really wants to turn in. Totally awesome on track.
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This is the new god’s tire. Nothing even comes close. RE-71R. I’m done with Cup2. Grip level is out of control.
West is it the compound of the tire or the tread pattern. What do you look for in getting a tire with better grip.
Tire compound and sidewall stiffness. They seem fine in the damp/wet also. Didn’t try in deep water.
Purchased the RE71R about a month ago, great tire. Used first time at Watkins Glen about two weeks ago couldn’t say enough about how they helped at first time road course car stuck like glue. Ran them 35/35psi first couple of sessions and then dropped them down to 31/31psi which helped me find the sweet spot and my pressures stayed at 38psi all of the next three sessions. Also, used at drag strip a week later, where I had to proceed and get used to the straight line traction they provide. Bogged first three runs with mash and go, so I had to up the rpms in order to get off the line decently…
Now on to another subject: StAssis Coilovers what’s the difference between the blue and red springs does anyone know? I’m looking into a used set with low miles or should I go with Bilteins PSS10’s B16 and be done with it…? What are the spring rates supposed to be for the StAssis suspension on the S4? They’re attractive to me because of the ohlin shocks.