Quote:
Originally Posted by patrickt
Fair 'nuf. My stuff is seven or eight years old now, and in this hobby, a company can be bought, sold, gutted, and reborn easily in that time. When I had ERA build my car for me, they were about as good as you could get, but maybe that has changed.
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used both interchangeable for years. had some sets (more than one) of eibach recently that were flat and parallel top and bottom but the axis (center-line) was not perpendicular to the ends. a little like the leaning tower of Pisa with a flat top parallel to the ground. this caused excessive side load on the shock shaft from the spring not loading evenly. it put heat marks on the shock shafts and in this case chewed up the damper perches as the springs were free (no pre-load) at full droop. granted the spring heights are much shorter and rates much higher (2-1/4 ID, 1050 lb/in, 5"), but haven't seen that in the hypercoil. haven't had any sag or rate issues with either spring manufacture and this issue i'm sure only affects a small percentage but.... if everything is square and happy i'm sure either is fine. but after that we just dont buy eibach anymore. if you roll them on a flat table you can see if its an issue, or check with a square. with the ERA having relatively soft long springs with a fair bit of travel might not be a bad idea to use a thrust washer on one end against the spring too keep the side loading down by reducing the spring twist from rebound to bump.