REINING IN YOUR BUMP STEER
HOW TO BUILD YOUR OWN BUMP-STEER GAUGE ON A BUDGET
Welcome to the Weekend Workshop, a place where you can save some cash by getting your hands dirty. These tech guides aim to arm you with the necessary info and knowledge to get out there and give it a go yourself, with no professionals needed, and at a price tag that won’t break the bank. This month, we delve into building a bump-steer measuring device that will work on both double A-arm and MacPherson struts. You can buy off-the-shelf kits that are nice and fancy from race suppliers, but a few hours and a small amount of materials will give you your own kit for a fraction of the price. Why do you need to measure bump steer? Bump steer occurs during your suspension travel. It’s effectively dynamic toe caused by your steering arm moving on a different arc to the lower control arm, causing a shift in your car’s toe settings. This is often the case in lowered vehicles — the lower you go, the worse it gets — and, if your car’s road going, it will be subject to a bump-steer test by your Low Volume Vehicle (LVV) certifier. In a racetrack situation, bump steer can result in your car being anything from nervous to downright dangerous.