Suspension & Brakes Theory, alignment, spring rates....

Bump stops, Trash or cut in half?

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Old Nov 20, 2006 | 08:01 PM
  #1  
Metal Head's Avatar
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Default Bump stops, Trash or cut in half?

I wanna see who actually usues the bump stops and who dont and who cuts them in half.

I always though when you have springs you cut them in half, when you ride coilovers you thrash them.

From my experience, I put coilovers on my Civic, kept the bump stops and the car was "bouncy" if yopu will, Took them out, it was less bouncy, but the question is, willt aking them out kill the struts faster? or is it the slamming of the car kiiling the struts.

reason why I ask, I bought some tokito blues about 7 months ago, and the front struts are totally SHOT. I bought some KYB AGX's and want to do my suspenton RIGHT this time and not have to buy new struts every 6 months!!


So this is like a poll, type the following:

Cut in half
Keep them
Thrash them bitches, and type what srings your using coilovers or Springs.
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Old Nov 20, 2006 | 08:24 PM
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Default Re: Bump stops, Trash or cut in half? (Metal Head)

all depends on the type of spring and strut your useing.

eibach sportlines says to cut the stop in half
h&r race says to keep them.

On stock struts, cutting the stop will put more stress on the strut and it will blow out faster then normal. Get a strut that can handle the extra abuse like a koni yellow etc.

KYB AGX's are good for daily driving and if your not lowered more then 1.25 on the strut. If your lower or are racing, get a better strut.

it's all basically trial and error and whats comfortable to you and what you like and how your car responds to it.
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Old Nov 20, 2006 | 08:53 PM
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Default Re: Bump stops, Trash or cut in half? (dohcdelsol)

so kyb agx's with nuespeed springs, cut in half? What about KYB agx's with coilovers?
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Old Nov 20, 2006 | 09:08 PM
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Default Re: Bump stops, Trash or cut in half? (Metal Head)

neuspeed says not to cut the bumpstop.
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Old Nov 21, 2006 | 06:52 AM
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Default Re: Bump stops, Trash or cut in half? (byronl)

Think of a bump rubber like a trigger safety on a handgun. It is there to protect you from something bad happening. If you have it, it is not guarantee that something bad one happen but it is basically insurance. If you have not bump rubber or safety, it is just a matter of time before someone gets hurt.

Additionally, it is common for many car manufacturers to use a longer and softer bump rubber as part of the working rate of a spring, basically as the final step of progressivity. Lots of SUVS, VWs, some Hondas, and many more are like that. Many aftermarket spring companies will also select a design that specifically expects some input from the bump rubber at the end of it's range. Some companies choose to not have your car touch the bump rubber ar all so it is less important. If your springs were made to have the bump rubber there and you have cut or removed it, your car may sit lower and will at least overstroke on a big bump and it is very likely that you will bottom and damage your damper. Many years ago, bump rubbers were simply there for backup and never made contact during normal useage but as suspension designs got better and more developed they added normal working function to the previous protection only role.

The real answer is to follow the design specifications of the manufacturer of your springs. A stock height car on stock springs can still bottom if you do a Thelma and Louise off a mountain top or if you hit an evil pothole just right. Having a trimmed bump stop is fine so long as there is enough there to greatly reduce the chance of metal to metal internal contact and your driving style and spring design matches. No bump stop is like hold a gun to your head sex without a condom, it is just a matter of time and you are playing the odds.

I can tell you that after working at Koni for over a decade, the leading cause of death amonst Koni street dampers is internal bottoming causing valving destruction due to hitting something with insufficient or no bump rubber in combination with lowering springs. Obviously, this is not covered under warranty because bottoming cannot possibly be a defect, it is very balck and white. It is your call but every one of my street and race cars has bump rubbers from stock to trimmed no more than half regardless of stock, fixed height lowering springs or coil-overs.

Use the safety latch on the trigger, wrap that rascal, and use a bump rubber.
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Old Nov 21, 2006 | 04:09 PM
  #6  
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Default Re: Bump stops, Trash or cut in half? (CRX Lee)

good info, I think imma cut them in half when I get the new struts. Ill see what everyone reccomends on the KYB AGX's with nuespeed or coilovers.........
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Old Apr 18, 2007 | 01:58 PM
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Default Re: Bump stops, Trash or cut in half? (Metal Head)

Just got my AGX with Eibach Sportline no front bumpstops who sells them?
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Old Apr 19, 2007 | 08:01 AM
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Default Re: Bump stops, Trash or cut in half? (hpsi93)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hpsi93 &raquo;</TD></TR><TR><TD CLASS="quote">Just got my AGX with Eibach Sportline no front bumpstops who sells them? </TD></TR></TABLE>

Ground control sells some aftermarket ones, or you can get OEM ones from any online Honda dealer (hondapartsdeals.com or slhondaparts.com)...
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