Coil Springs
The right way to lowered our vehicle
Use PERFORMAX coil spring which design for dedicated usage based on individual model.
Never cut the coil spring to lowered the vehicle despite being cost effective and simple. This is because original/stock coil spring are optimized due to cost factor, this approach will caused coil spring breakage which lead to catastrophic accident.
Â
Common mistake of judging a coil spring
Coil spring was design to support the vehicle load. Therefore comparing spring without load was not the proper way of judging a coil spring. Manufacturer measure Spring Rate, Load at Specific Height, and Deflection to judge an coil spring.
Why measuring fender gap with fingers are subjective
Â
The most common way adopted by car enthusiast of measuring how much lowering effect after changing lowering spring was by poking fingers in between the gap of tyre and fender. This method undeniable was the most convenient way as not everyone carry measurement tape everywhere, however the outcome of such method may vary between vehicle and even measuring at different time of the same vehicle due to the factors listed below. Therefore this method is OK as an indication of the height difference before and after installation of lowering spring on the same vehicle within specific time frame.
Factors which effect the outcome:
The measuring outcome from different combination of rim and tyre size will varies from half a finger to more than a finger. Below show 2 scenarios out of many to give an idea on the difference.
Â
New tyre has a thread depth of about 8~9mm, and 1.6mm is the minimum allowable depth based on Puspakom regulations. Meaning there is a difference of 6.4~7.4mm from new tyre to a fully worn out tyre which is about half a finger. Even different brand of tyre may effect the outcome.
Â
When to measure vehicle height upon replacement of coil spring
Upon coil spring replacement, it is recommended to measure vehicle height after driving it for a period of time over rough road and road undulation making sure to stroke the suspension enough to let absorber and relevant bushes and rubbers to set back to its original positon under load to obtain the correct vehicle height.
Most of the cases whereby wrong perception directing to coil spring sagging (dropped in height) comparing against vehicle height right after a coil spring replacement before the car being driven. This is because jacking the car up during coil spring replacement will unload and relieve all deformation and stress from all bushes and rubbers, and therefore those parts needed time to deform back to its original state after loading it with vehicle weight and stroking the suspension.
