REIN­ING IN YOUR BUMP STEER

HOW TO BUILD YOUR OWN BUMP-STEER GAUGE ON A BUD­GET

NZ Performance Car - - Contents -

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.

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