cutting bump stops? pfadt - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

11flat · 02-09-2010, 07:14 PM

What is the point of cutting the bump stomps when installing pfadt drop springs? Is this what actually lowers the car?

PQ · 02-09-2010, 07:53 PM

No it isn't what actually lowers. It must be cut as to not bottom out before it normally would.

At least that's the way I understand as the purpose. But I know it isn't what lowers. If that were the case, you wouldn't need the new springs. lol

Nine Ball · 02-09-2010, 08:03 PM

It provides your factory shock with a bit more travel before bottoming out. When you lower a car and keep the factory shocks, it reduces the available shock travel. Cutting the bump stops (they are inside the shock dust cover) gives a little more travel back.

Here is my how-to article on the Pfadt springs. You will see pics of the bump stops, they are the yellow-ish rubber things.

http://www.planetlsx.com/tech/How_To...010_Camaro/131

PQ · 02-09-2010, 08:44 PM

Quote:

Originally Posted by Nine Ball

It provides your factory shock with a bit more travel before bottoming out. When you lower a car and keep the factory shocks, it reduces the available shock travel. Cutting the bump stops (they are inside the shock dust cover) gives a little more travel back.

Here is my how-to article on the Pfadt springs. You will see pics of the bump stops, they are the yellow-ish rubber things.

http://www.planetlsx.com/tech/How_To...010_Camaro/131

GREAT write up. I printed and used it. Right down to the last tool needed.

11flat · 02-09-2010, 09:38 PM

Thanks Guys!!

PfadtRacing · 02-15-2010, 02:50 PM

Hi 11flat,

Very sorry for the late response. Sounds like you got everything taken care of already. I'd like to explain why we reccommend cutting the bumpstops in our procedure. Our Pfadt drop springs provide a 1.25" drop approximately. As a result of this change in static ride height, the usable region of the damper travel is offset, to be approximately 1.25" lower. The Camaro has a very limited amount of bump travel to begin with, before contacting the OEM bumpstops. We recommend to trim 1" from the bumpstop in our installation procedure to give you back that 1.00" of damper travel, that is not influenced by the added spring rate of the bump rubber. We leave some bump stop in place to give a rising rate on big hits. Because dampers function by resisting the shaft velocity, this offset operating region has no negative effects on the component durability, or performance.

This conclusion was made from testing, and experiencing harsh bump characteristics that some have mentioned, who have not cut them. This of course, is just our position in regards to our own product installation. I hope that helps clarify the reasoning.

02-09-2010, 07:14 PM	#1
11flat Drives: 2010 camaro ss/rs m6 Join Date: Oct 2009 Location: moreno valley, ca Posts: 117	cutting bump stops? pfadt What is the point of cutting the bump stomps when installing pfadt drop springs? Is this what actually lowers the car?

02-09-2010, 07:53 PM	#2
PQ Booooosted. Drives: 2010 Supercharged SS Join Date: Apr 2008 Location: Mobile, AL Posts: 36,716 View My Garage	No it isn't what actually lowers. It must be cut as to not bottom out before it normally would. At least that's the way I understand as the purpose. But I know it isn't what lowers. If that were the case, you wouldn't need the new springs. lol __________________

02-09-2010, 08:03 PM	#3
Nine Ball Drives: 1969 & 2016 Camaro SS Join Date: Oct 2008 Location: Houston, TX Posts: 3,849	It provides your factory shock with a bit more travel before bottoming out. When you lower a car and keep the factory shocks, it reduces the available shock travel. Cutting the bump stops (they are inside the shock dust cover) gives a little more travel back. Here is my how-to article on the Pfadt springs. You will see pics of the bump stops, they are the yellow-ish rubber things. http://www.planetlsx.com/tech/How_To...010_Camaro/131 __________________ Fquick.com/NineBall

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02-09-2010, 09:38 PM	#5
11flat Drives: 2010 camaro ss/rs m6 Join Date: Oct 2009 Location: moreno valley, ca Posts: 117	Thanks Guys!!

02-15-2010, 02:50 PM	#6
PfadtRacing Drives: 2010 Camaro, 2006 Z06 Join Date: Feb 2009 Location: SLC, UT Posts: 3,370	Hi 11flat, Very sorry for the late response. Sounds like you got everything taken care of already. I'd like to explain why we reccommend cutting the bumpstops in our procedure. Our Pfadt drop springs provide a 1.25" drop approximately. As a result of this change in static ride height, the usable region of the damper travel is offset, to be approximately 1.25" lower. The Camaro has a very limited amount of bump travel to begin with, before contacting the OEM bumpstops. We recommend to trim 1" from the bumpstop in our installation procedure to give you back that 1.00" of damper travel, that is not influenced by the added spring rate of the bump rubber. We leave some bump stop in place to give a rising rate on big hits. Because dampers function by resisting the shaft velocity, this offset operating region has no negative effects on the component durability, or performance. This conclusion was made from testing, and experiencing harsh bump characteristics that some have mentioned, who have not cut them. This of course, is just our position in regards to our own product installation. I hope that helps clarify the reasoning.