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Independent Rear Suspension (IRS) and Bump Steer Elimination

1:07
30:04
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At 1:07 in

Dr. Gas's NASCAR Inspired Mustangs: $1,400 Shelby GT350 & Fastback Track Car

What happens here

Boyd demonstrates the unique independent rear suspension (IRS) of the Sledgehammer. He explains that the entire rear suspension assembly moves back and forth on linear bearings, driven by a rack unit. This design ensures that the inner and outer tie rods remain parallel to the lower control arm, effectively eliminating 'bump steer' and significantly improving handling, especially at high speeds. He also points out the locations where the inner and outer tie rods would normally be placed on a conventional setup.

Goal: Detail the custom independent rear suspension and its function in preventing bump steer.

Tools and materials

  • Linear Bearing Rods

What they say

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Yes. Um, yes. In a car that has an intake manifold. Actually, if you want, I can 100% answer this question. Oh, actually, I have one here on... It looks like my workshop here. I have to scatter these things everywhere. Cut some of this out. Let me see, I have one here. Don't act like a kid in a candy store here. Will this fit in my carry-on luggage? OK. With a carburetor, when you have a camshaft with a large overlap, there are times when the intake and exhaust valves are open at the same time, the exhaust is closed and the intake is open, but there is overlap. So some of the exhaust gases are returned back to the intake channels. And this contamination in the intake stream causes uneven idling . So when you hear someone say, "Oh, this camshaft has an uneven idle." If you have an ITB system, problem solved. He doesn't twitch. No. Really? No. On the singles. It just works. This is because there is no pollution. There is no common chamber where contamination from any other cylinder could enter. This is not happening. So, come on, we'll go get him. Yes. Let's go around here so we don't I've never, ever thought about this before. Does this phenomenon occur mainly at idle, or also under load? No, you know, I would say the effect is just better throttle response everywhere, from idle and up. If I pressed the accelerator here more than a quarter of an inch, this engine would rev to 3,500

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