B8 S4/S5 Suspension Thread

Got some used springs from a racecar. Fun fact about steel springs - they don’t wear out.

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what race car?

No clue. Probably a Porsche or Aston Martin, as that shop specializes in those.

I’m probably past the point where I should have switched to slicks for the track. Might go with Hoosier R7 (265) on BBS CH-R (19") in the future. Have to find a good portable jack, some wheel studs, etc.

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.

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034 rear toe links.

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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.