Great 60 ft frame mods

Discussion in 'Race car chassis tech' started by Weekender, Jan 23, 2018.

  1. Weekender

    Weekender weekender

    I thought some of you might be interested in some frame mods I made to the Old Iron Regal to achieve some great 60 foot times. All the horsepower in the world doesn't matter if you can't apply it to the launch pad. We consistently achieve 60" times of 1.41, with a best of 1.38. Getting 3850 lbs on 10.5" tires to launch like this has taken me years to achieve.

    Along with the frame mods. shown in the in the attachments I have also boxed the side rails, narrowed the frame rails over the rear end housing and moved the instant center forward so the car has a better anti-squat capabilities.

    View attachment 378587 View attachment 378586
    Last edited: Jan 25, 2018
  2. hwprouty

    hwprouty Platinum Level Contributor

    Nice work!!
  3. Weekender

    Weekender weekender

    Gold GS likes this.
  4. Gary Bohannon

    Gary Bohannon Well-Known Member

    What setting do you have on the rear shocks? Compression looks loose. the rear squats and stays down nicely. Look like it helps the front to rise also.
    Launch looks awesome.
  5. Weekender

    Weekender weekender

    Hi Gary, This is a little late but I found your question and wanted to reply. I usually start at 3 clicks (mid-setting) then let the car and track conditions tell me if I need changes. If I have tire chatter, I increase 1 or 2 clicks positive to remedy. If the car moves right which is usually the case, I add 1 click positive at a time on the right shock until it is straight. If it move left I do the same to the left shock. With regards to your comment on the compression, I recently moved the back of the upper trailing arms up one hole on my rear end. If you want to see what happened, I have slow motion videos on this, go to my channel on Youtube search for weekender825 to see what adding anti-squat does with body separation. this one change got us into 1:35 second 60 foot time consistently. it stiffened up the compression that you mentioned.

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