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Opinions on leaf Springs, coil overs, or torsion bar rear for RPU?

Discussion in 'The Hokey Ass Message Board' started by JPMACHADO, Aug 25, 2007.

  1. JPMACHADO
    Joined: Feb 9, 2006
    Posts: 983

    JPMACHADO
    Member
    from Not Listed

    I'm getting ready to build my rear frame rail kick ups for the RPU chassis I just started. The front end is going to have torsion bars. The rear end still needs to be decided. Becasue of the RPU set up I have a lot of room in the rear for what ever I want. Frankly, I just don't know enough to decide. Each one of these choices seems like it'd be cool. Are there disadvantages to one of these over the others? The car may be run down the strip, but it will be mostly a common driver with about 380 HP. thanks for any advise

    I'm editing to add I'm looking for something that is low maintenance as well.
     
  2. draggin ass
    Joined: Jun 17, 2005
    Posts: 1,920

    draggin ass
    BANNED
    from hell

    well my opinion is, traditional single leaf and wishbone looks the best and most period correct. but as far as function goes it sucks. in fact most people on here will freak out if you post one with wishbones(at least they did mine...). so if you want it to look 50s, and dont care about pissing everyone off then go traditional. if you want to keep the wheels planted you need to get a 4 link with coil springs.
     
  3. Flatman
    Joined: Dec 20, 2005
    Posts: 1,975

    Flatman
    Member

    Are you making the rear crossmember? A transverse leaf spring set up might crowd the bed of your RPU from below whereas a coil over set up with four link should let you keep the box unmolested.

    A "common driver" with 380HP?:eek: :D

    Flatman
     
  4. JPMACHADO
    Joined: Feb 9, 2006
    Posts: 983

    JPMACHADO
    Member
    from Not Listed


    Yes, I'm making everything. When I say leafs I mean parallell leafs. The only reason I called it a common driver is I've seen some guys on here making 500+ HP for racing applications. Even with the 380 HP that'll be top end limit I never use.
     

  5. GassersGarage
    Joined: Jul 1, 2007
    Posts: 4,729

    GassersGarage
    Member

    I think for the best ride, parallel leafs. I had coilovers on my 32' 3 window and they were too easy to bottom out. Plus, I had to have them rebuilt twice for leaking. Fortunately, they were guaranteed for life.
     
  6. Notorious
    Joined: Jul 18, 2007
    Posts: 393

    Notorious
    Member

    No argument here. My daily driver makes over 380 HP at the rear wheels. Not only does it drive like a baby carriage in normal driving, you'll probably call me a liar if I tell you it gets 26 MPG + on the highway and 15 MPG in town. You just gotta love electronic engine management....
     
  7. JPMACHADO
    Joined: Feb 9, 2006
    Posts: 983

    JPMACHADO
    Member
    from Not Listed


    This is the kind of info I was wondering about. I have some QA1 coilovers on the back of my scratch built roadster right now. I haven't been that impressed with the difference between them and the leafsprings on my daily driver truck. Also, I hear from a lot of people that coilovers leak all the time. Thanks
     
  8. Candy-Man
    Joined: Mar 21, 2006
    Posts: 1,713

    Candy-Man
    Member

    If you are going to take it down the 1320', only my opinion, use the coil overs.... Second option, parallel leaf springs.....
     
  9. lawrence
    Joined: Feb 20, 2006
    Posts: 28

    lawrence
    Member
    from Bamalama

    QA1? Those are high dollar racing shocks correct? If you don't mind me asking, how much?
     
  10. JPMACHADO
    Joined: Feb 9, 2006
    Posts: 983

    JPMACHADO
    Member
    from Not Listed


    I have them front and rear. They were pricey. I think around $140 for the rears and twice that for the fronts. I had already started the build before I found the HAMB. The coilovers are nice, but they really stick out, and there's too much adjustment for my lazy ass.
     
  11. old dirt tracker
    Joined: Sep 20, 2006
    Posts: 1,002

    old dirt tracker
    Member
    from phoenix

    look at the oem manfactures for your answer. parallel leafs.
     
  12. bonesy
    Joined: Aug 14, 2005
    Posts: 2,999

    bonesy
    Member

    Leaf Springs
     

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