ok so my car is tucking a 195/50/15 2000 civic.. on tein flex.. sometimes i hit my headers over bigger dips.. my question is if i put more preload will the suspension have less travel thus giving me a less chance of hitting my header??

 

No.

 

please can you just ignore my threads you are not helpfull at all..

 

How is he not helpful? He answered your question

 

with no explination

 

no, you need to raise your ride height.

 

As grumblemarc indicated preload doesn't affect spring rate. Follow Tyson's advice or get stiffer springs.

 

so what does increasing the preload do then??

 

the springrate on teins page says 9/504

 

Nothing.

Post a picture of how the car sits.

 

tadaa

 

Avoid big dips

 

This is not true.

Preload will in effect increase static ride height. It also increases the amount of force needed to begin spring compression (which raising the threaded body/ride height alone will not do). So yes it could help you avoid hitting the header. Just make sure there is no chance the coil binds before the bumpstop is compressed. You don't want your suspension stop to be the spring.

 

how do i make sure the coil wont bind before the bumpstop is compressed

 

get a ruler out and measure. if calculated collapsed coil height > exposed damper rod length then you would have a problem.

it's very unlikely this will happen though so I wouldn't worry about it.

I should clarify that this::
Preload will in effect increase static ride height.
Is cause by this:
It also increases the amount of force needed to begin spring compression (which raising the threaded body/ride height alone will not do).


I will also make clear that the point of changing preload is to alter the ratio of compression travel/rebound travel(droop). Ideally the ride height should be altered through the threaded body in your case. If you need more, then turn up the collar and increase preload.


.

 

You know, you could also try running the correct tire size, instead of tires too small in diameter. Doing so would raise the car slightly and decrease the fender gap.