Andy Hollis
Andy Hollis
12/31/15 2:58 p.m.

Suspension mods are one of the first things we enthusiasts delve into when looking to improve the performance of our cars. And we don’t do it alone: We decide on parts and a plan of attack with help from dozens of influences. Other owners of similar vehicles advise us, whether in person or on Internet forums. The websites and magazine ads of parts retailers, with their dazzling pictures of shiny wares and astounding claims of performance increases, also get our credit cards itching.

But does all this information add up to a suspension setup that meets our goals? Some problems are obvious, but others hide themselves well. Here are six common suspension pitfalls that may be holding you back.

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fe1rx
fe1rx New Reader
10/16/17 12:40 p.m.

One aspect of "bottoming out" that is sometimes neglected is coil bind on the springs.  It is important to check that your springs have enough stroke to fully engage the bump stops before they coil bind, particularly if you coil-over spring choice is non-standard.  This is particularly an issue if short springs are used to improve tire clearance on a strut.

Trackmouse
Trackmouse SuperDork
10/16/17 1:53 p.m.

Roll center is huge. So many ppl don’t even know about. They slap in the lowest mad jdm tyte yo! Springs possible, and then encounter ridiculous understeer and then try to fix it with absurd rear sway bars, leading to a vehicle that understeers very easily, but throttle over or snap oversteers unpredictably. One dangerous dynamic in the hands of a high schooler. 

HapDL
HapDL New Reader
10/16/17 6:52 p.m.

Most people do shti to their cars for asthetic events, such as cars and coffee and contributing to the resultant carnage afterwards.  There is sometimes beauty in the writing off of a car that's been tragically "improved" by its owner.

Knurled
Knurled MegaDork
10/16/17 7:51 p.m.

In reply to Trackmouse :

My RX-7 sits high because that's the easiest way to get the roll center off the ground.

 

FC subframe swaps into FBs suck unless you heavily section the chassis to get the roll center up.  Which almost nobody does.  The new hotness in early RX-7-land is Mazdaspeed3 ball joints so you can use FC uprights with FB suspension, so you can get wheel bearings that don't suck (as much) and keep the good front end geometry.

vettelocke
vettelocke New Reader
10/16/17 8:08 p.m.

Another aspect we found on the Celicas was that lowering them too much put the half shafts at an angle which only increased in jounce. The result was frequent CV joint failure on the shorter one. 

Locke

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