The best Swift Springs part for a coilover build in this collection is its only entry: the Swift Helper Springs, sold in pairs. The listing describes them as 0.8kg/mm helper springs used for maximum suspension droop, and calls them ideal for autocross or tight technical driving. If your coilovers lose spring seating at full droop, this is the small part that addresses it.
A helper spring is a very low-rate spring stacked with the main spring on a coilover. At normal ride height it is fully compressed and does almost nothing; at full droop, when the damper extends, it expands and keeps the main spring located on its perch instead of rattling loose or unseating. That is why the rate is so light, and why helpers are a tuning part for cars that lift wheels or run long droop travel, not a lowering upgrade on their own. They must match your damper's spring diameter and stack length, so check your coilover specification before ordering.
Build the rest of the setup from the wider shelves: all Suspension, complete spring options in Performance Lowering Springs, and for the thinking behind spring choices, read revolutionizing suspension: coilovers and springs.
Brands to know
Swift Springs is known in coilover tuning for springs wound to tight rate tolerances and offered in metric rates, which is why builders reach for the name when a setup is being fine-tuned rather than just lowered. In this collection that specialty shows in miniature: a 0.8kg/mm helper is a specialist part, sold in pairs so both sides of an axle match. Judge it on fit for your dampers first.
HyperCo is the other specialist spring name in this catalog, carried here for its HyperCoil springs, also sold in pairs. Owners cross-shop HyperCo and Swift when choosing replacement or tuning springs for coilovers, and the decision usually comes down to the rate, length and diameter a particular damper needs. Either way, springs are bought to a specification, not just to a car, so confirm the numbers your setup requires.
Eibach is one of the most established spring makers in the aftermarket, best known for lowering springs and anti-roll kits fitted to street cars. Its relevance here is contrast: an Eibach lowering spring works as the main spring, while the Swift part is a helper that supports the main spring's seating.
FAQ
What rate are these Swift helper springs?
The listing states 0.8kg/mm and says they are used for maximum suspension droop. That very light rate is normal for a helper spring, which is not meant to carry the car.
Do helper springs lower my car?
No. At ride height a helper spring is fully compressed; its job is to keep the main spring seated when the suspension droops. Ride height is set by the main spring and damper adjustment.
Are they sold individually?
The title says sold in pairs, so one purchase covers one axle. Confirm the quantity and the spring dimensions your coilovers need before ordering.
Who needs helper springs?
The listing points to autocross and tight technical driving, where droop and wheel lift are common. A street car on standard coilovers may never unseat a main spring, so check whether your setup actually has the problem first.
