Lowering Ride Height Using AHC

Discussion in '100-Series Cruisers' started by mscott, Jul 25, 2005.

  1. mscott

    mscott

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    Has anyone ever lowered the vehicle for highway driving? I'm wondering if you can impact fuel efficiency. Maybe wring another mile out of a gallon. Anyone?
     
  2. e9999

    e9999 You want to do what...? Moderator

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    thought I read that it goes back to some default setting if the speed exceeds some lowish value?
     
  3. hoser

    hoser SILVER Star

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    It is possible to "trick" the system but keep in mind, when you lower it almost 2 inches, there will be a change in your front alignment setting. You'll have also lost 2 inches of suspension travel.
     
  4. Jim_Chow

    Jim_Chow

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    I've seen JDM AHC controller units that allow one to raise/lower the suspension in 10mm increments while driving or stopped. My main concern would be the CV joint angles/wear. It is correct to say that when the AHC is raised, all the load is off the t-bars, and, therefore, the CV joint angle increases beyond what is optimal for maximum durability?
     
  5. ace10

    ace10

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    why would you assume that lowering a vehicle would improve it's fuel efficiency? it's the same weight and the same frontal area.

    it's a 6K pound, fulltime 4wd, barn on wheels.

    my top-of-the-hat to fuel economy is the removal of the worthless roofrack crossbars. it's a bit of work, but they're certainly not being used and cannot be good for slipping through the air.
     
  6. mscott

    mscott

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    That's my point. It would not be the same frontal area. The height would be reduced by 2 inches. In addition, I believe (possibly incorrectly) that the lowering of the vehicle would better direct airflow around and under the suspension.

    I'm not concerned about the loss of travel, because I'm only traversing the pebbles and pot holes on the highway...


    I agree, its a barn on wheels, and I love it. But, if I'm on a 600 mile road trip on major interstate highways, I need every bit of fuel efficiency I can sqeeze! If I can get it by using a built in function of the vehicle, I'm gonna explore it.

    Anymore thoughts?

    -- Mike
     
  7. hoser

    hoser SILVER Star

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    Sure, maybe... but just so you know, here is a picture of the suspension fully lowered. I couldn't fit a finger in there--it is less than 1/2" at the bumpstop. 1/2" at the bumpstop is probably just over an 1" travel at the wheel. Maybe somebody can calculate that. At normal ride height, there is over an inch of clearance at the bumpstop.
    bumpstop.jpg
     
  8. mscott

    mscott

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    Great point hose. Thanks for the picture. I wonder if I'd also need to consider changes in suspension geometry since we'd be talking a lot of miles in that configuration... Wouldn't want to destroy the tires w/very uneven wear.
     
  9. LX_TREME

    LX_TREME

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  10. HDJ100L

    HDJ100L

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    hello,

    this is the unit from bblanks. it bypasses the AHC to lock the height either high or low. check it at www.bblanks.com :)
     
    Last edited: Feb 9, 2006
  11. ndcruiser

    ndcruiser

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    I'd be more interested in raising the ride height. I read somewhere it could be "fooled" into staying up there, do you need aftermarket equip to do it? I'm also wondering about the driveshaft angle, unless it was designed to compensate for it.

    John
     
  12. hickok

    hickok

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    bblanks system

    Does anyone have a system like this in the US for sale?
     
  13. Trollhole

    Trollhole THC Supporting Vendor Moderator

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    A touareg when it is over 60 mph it will lower for better fuel economy. Will also dip the front for better viewing and servicing when the hood is open. Maybe a few tricks Toyota could add. Also has a 4x4 mode to encrease ground clearance by 2 inches.
     
  14. hoser

    hoser SILVER Star

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    The BBlanks post above you is what you need. There are others that are cheaper that don't use the factory controls. You will also need to get an alignment job and will probably want to get a drop down bracket for the front suspension. There will be no problems with the driveshaft angle.

    I don't know anybody in the US that carries the BBlanks AHC control but I was thinking about ordering one from Japan. The price is about $350US plus whatever costs to get it here.

    Christo is working on a blackbox that will do the same thing. Not sure when it will be out but I don't think it will be available before summer's end.
     
  15. hickok

    hickok

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    Christo -

    Any scheduled date we should start seeing the black box for sale?
     
  16. LX_TREME

    LX_TREME

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  17. hickok

    hickok

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    bump

    Just wondering if anyone is importing the bblanks adjustable system or does Christo have his AHC just about finished?
     
  18. hickok

    hickok

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    bumpa-dee

    Am I SOL?
     
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