How much improvement will polyurethane bushings give me?

I have a 2003 Honda Element awd and I've had all 4 sway bar links along with 2 front and rear sway bar bushings replaced. So far the car feels like it handles new.
However, I've been looking into polyurethane bushings as I want to increase my cars ability to take corners and feel more stable. My question is if I can take a curve at 80 mph, how much faster(in mph) would I be able to take that same curve if I install polyurethane bushings on the control arms and sway bars?

Nobody could calculate that. The limiting factors are the Tires and Shocks. And stiffer Shocks or Struts would make it feel more stable than Poly Bushings. Bilstein and KYB probably make the stiffest shocks for that car.

Almost none.

The ride might be a bit firmer, but the big advantage of poly bushings is that they last far longer. Your bushings are new so will feel very similar unless you switch to polys which are definitely harder than OEM. Even then you'll just get more road noise coming into the passenger cabin at all speeds and a harsher ride quality.

Carefully chosen adjustments to the suspension, possibly with changes to the rims and tyres plus the springs/struts, along with possible ride height adjustments could make small improvements. But you need to change one thing at a time and carefully assess *and measure* the actual differences on the same track each time. Just because a change sounds or feels faster is irrelevant. It's what the recorded data says, averaged over multiple runs under the same track conditions, which tells the truth.

Note that if the ride gets too hard, the suspension will only be safe under the totally flat conditions on a good racetrack. On real roads it won't.

Maybe 81 MPH…

New bushings won't help you drive faster around corners, Mark. Instead of worrying about your Honda Element, you need to figure out what upgrades you can make on YOURSELF. Investing in yourself is much cheaper and has long-term benefits.

It can be as simple of making a list of your most important life priorities. Then you have to focus on keeping the main thing the main thing. Don't get sidetracked on diversions.

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