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Bump stop questions

PostPosted: Tue Jun 16, 2009 8:44 pm
by drndrn
Alright, after browsing through the forums I have found many people have mentioned bump stops or trimming these bump stops. I've googled it with no solid answers so.. Anyone care to shed some light on these especially when it comes to our libs? What are they? How low can you go before you have to trim? Why do you have to trim them? etc etc.

Re: Bump stop questions

PostPosted: Tue Jun 16, 2009 8:44 pm
by WhiteGTB
Have you lowered your car?

Re: Bump stop questions

PostPosted: Tue Jun 16, 2009 8:48 pm
by drndrn
Yeah, im on stock shocks (non bilsteins) with s-techs.

Re: Bump stop questions

PostPosted: Tue Jun 16, 2009 9:02 pm
by Sentinel
Are you asking "what / where are they" or "how to chop them up"?

Re: Bump stop questions

PostPosted: Tue Jun 16, 2009 9:05 pm
by drndrn
Both. I don't have a clue what they are.

Re: Bump stop questions

PostPosted: Tue Jun 16, 2009 9:11 pm
by tangcla
They're basically rubber blocks which have a compressive (spring) rate which is quite firm, to prevent the shock absorber from hitting rock bottom. They are quite firm.

Re: Bump stop questions

PostPosted: Tue Jun 16, 2009 9:55 pm
by Sentinel
drndrn wrote:Both. I don't have a clue what they are.


OK.

What are they?
Well - putting it simply, when the suspension "bottoms out" what happens is that the suspension has reached it's limits in being able to absorb the 'shock', or in other words the body of the car or dampers crashes into the suspension components. To prevent damage the either the car or the suspension, manufacturers put bump stops in to soften the impact b/w the two. On the Lib's, they are typically rubber domes (picture the top of bullet) for the rears.

Image

In terms of chopping them, it means to reduce the height, thereby giving more travel for the suspension.

Cheers

Re: Bump stop questions

PostPosted: Tue Jun 16, 2009 10:00 pm
by tangcla
Just remember that modifying your bump stops are technically illegal...

Re: Bump stop questions

PostPosted: Tue Jun 16, 2009 10:01 pm
by Sentinel
tangcla wrote:Just remember that modifying your bump stops are technically illegal...


+1

Re: Bump stop questions

PostPosted: Tue Jun 16, 2009 10:02 pm
by Q
drndrn wrote:Alright, after browsing through the forums I have found many people have mentioned bump stops or trimming these bump stops. I've googled it with no solid answers so.. Anyone care to shed some light on these especially when it comes to our libs? What are they? How low can you go before you have to trim? Why do you have to trim them? etc etc.


Have a look here...

http://www.legacygt.com/forums/showthre ... +bump+stop

Re: Bump stop questions

PostPosted: Tue Jun 16, 2009 11:45 pm
by Arith
I took a few pics when I had my bump stops trimmed at Shift Performance when we had the 1st dent day. I too had no idea what to look for as I was expecting the same bump stops you see in the front suspension. Little did I know there were the black rubber nipples hanging down from the car. Weird!

But yeah, with my ride height, it's ideal to trim about half the bump stop to give the suspension a bit more travel. A bit more comfortable afterwards!

Here the guy at Shift is about to take a saw to my baby. The work is made a bit easier with the wheel off.
Image

As he pulls away you can see it more clearly now. As described, a black rubber nipple.
Image

A close up of the bump stop with a cut in it already.
Image

Just a simple saw will do the job.
Image

The tip of the nipple cut off.
Image

Re: Bump stop questions

PostPosted: Wed Jun 17, 2009 8:24 am
by tangcla
Arith wrote:As he pulls away you can see it more clearly now. As described, a black rubber nipple.

The tip of the nipple cut off.


That sounds kinky...

Re: Bump stop questions

PostPosted: Wed Jun 17, 2009 9:09 am
by Digital
that's one big ass nipple!

thanks for the pics jim...

Re: Bump stop questions

PostPosted: Wed Jun 17, 2009 11:02 am
by jdm rsk
love big nipples :D

Re: Bump stop questions

PostPosted: Wed Jun 17, 2009 11:22 am
by Digital
how about big areolas? :shock:

EDIT sorry darren this thread has taken a turn for the worse! hehe