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Thread: RTAB install. Preload changes when lowering?

  1. #1
    Join Date
    Feb 2019
    W/S, NC

    RTAB install. Preload changes when lowering?

    Wondering what you guy's thoughts were on RTAB's. I'll be installing a fresh set of Z4M Lemforders with AKG limiters. I've done this before on my old E46.

    My question is does the amount of preload on the bushing change when the car is lowered? Would it make sense to wait until I lower the car to install the new RTAB's. I've heard people in the past float theories that when a vehicle is lowered it changes the required preload on the bushing.

    Personally I don't think it matters, as long as when I install them I keep the preload identical to what it is now.

    What do you all think? Thanks

  2. #2
    It matters since the relation of the body to the hub changes when lowering the car.

    How much it matters? Not sure on that one. Stock preload spec is 8mm above hub center. Maybe increase it a few more mm for a lowered car?

    Sent from my Pixel 2 XL using Tapatalk

    2003 Blue ZHP Sedan @ 210k
    Dead due to damaged valve. We will save her soul for future use, but the body will go to car heaven...or another owner...who may or may not turn her into a race car...

  3. #3
    Join Date
    Nov 2013
    Bay Area
    I donít know the answer, but I do know I did it wrong on two cars

    I did full suspension on my zhp and that was the only thing I did wrong. And then I did it wrong on my zsp

    His: 2005 330 ZHP Imola Red - 1995 NA Miata
    Hers: 2004 330i ZSP
    2004 325 M56 Steel Blue Metallic - Sold
    Stephen's DD & AutoX/HPDE Build Thread
    Stewart WP - Z4M LCAB - M3 trans/motor mounts - DICE MediageBridge Duo - ARC-8 17x8.5"
    DrVANOS - Mason Engineering Race Strut Bar - E30 Exp. Cap - Custom Black+Beige Interior - M3 Seats
    Bilstein PSS10 - Turner Sway Bars 27/21 - ECST RTAB Limiters - R.E. RSM

  4. #4
    Join Date
    Jan 1970
    Lebanon, OH
    The amount that it matters is negligible

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