To those of you who have installed lowering springs, have you also installed the jounce bumper kit? I'm curious as I have some suspension parts on order from Rehagen, and wonder if these are worth the $25 to put on while I do the springs.

http://www.fordracingparts.com/parts...KeyField=12272

 

Depends on the drop and how much travel you have/will be working with.

The lower the car, the shorter and more progressive bumpstop I'd recommend.

I have a set of eibach bumpstops on some sportlines, and I find them all the time driving around. Would be miserable on the stockers

 

I'm going to run the FRPP "P" springs (1" drop).

 

I'm running those over Spec D shocks and stock Bump stops. No need In my opinion, and no evidence the Bump stops are hitting the chassis. If they were, I'd just trim the stock ones a bit..

 

Modshack is right they are not needed

 

I'll be doing the spring install later. Thanks for everyone that responded.

 

Hi,

I have a -1.5" drop with Ford Racing springs/Koni sport set and the M-5570-A bumpstop on my 2011 GT.



Here is the result looking through the left wheel :



There is less than 0.5" of free space (one finger)

I don't understand how the suspensions can work correctly with so little space

And it could explain the sound that seems coming from the trunk each time i drive on a road with short and harsh bumps.

 

I have the Eibach Pro kit springs (1"?) + Koni Sports 'yellow' shocks/struts w/ the FRPP jounce bumper set (yellow colored) and have no issues.

But the FRPP version is clearly shorter/geared towards use with lowered setups and have not really found them yet in daily driving. (which I think is a good thing)

 

I used the same jounce stops with going 1" lower. I cut the top mushroom off and it was a much better ride. Have someone sit in your car and take a picture. That clearance will be even less.

 

Thank you for your answers.

This aferternoon, i have cut off the top of the "mushroom" and the result is much better :

 

im on sportlines and was too lazy to put on the new bumpstops... Kept it stock and i havent hit them once....

And i live in chicago for christs sake

 

If your lowered and have stock bumpstops your hitting them. I didn't cut mine right away and you don't feel it to much hitting them. You will notice it more when you cut them. Get in your car like the op did and have someone take a look at how close you are.

 

Is it a bad thing hitting them? lol

 

The FRPP version has exactly the same height as the factory one. You can see the 2 versions on this picture :




When i received my order, i was very surprised to not find a smaller version