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Old 09-25-2007, 08:23 PM   #1
BIGSKYWRX
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Default so you want a different bump stop

I found the mother load of bump stops- they even have dynos w/ them

http://www.resuspension.com/Bump-Stops-p-1-c-92.html
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Old 09-25-2007, 08:24 PM   #2
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..... S C O R E ! ! ! ! ! ! !
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Old 09-25-2007, 08:46 PM   #3
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bump rubbers.


sounds dirty
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Old 09-25-2007, 11:01 PM   #4
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Forgive me for being a bit noobish here, but what specs do we need to hunt for on that page? I assume there's a specific ID and OD determined by our damper piston OD and dust boot ID. The rest length I would presume would need to be stock bumpstop height minus your drop. What about minimum length and overall stiffness?

In other words, how do I pick 4 of those buggers out?
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Old 09-26-2007, 07:39 AM   #5
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For the stock STI struts, you need a 38mm outer diameter or less. The WRX (or any non-inverted strut) needs at least a 22mm inside diameter. The length and durometer are totally up to you.

I personally really like the Prodrive bump stops up front for STI guys.

Great find, though, this site has tons of stuff!
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Old 09-26-2007, 09:26 AM   #6
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other antedoctyle info on the oe stops

WRX front is 60mm in lenth, the rears are 02/03 120mm, 04+ 90mm

WRX front is fully compressed @ 16mm
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Old 09-26-2007, 10:38 AM   #7
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Quote:
Originally Posted by stretchsje View Post
For the stock STI struts, you need a 38mm outer diameter or less. The WRX (or any non-inverted strut) needs at least a 22mm inside diameter. The length and durometer are totally up to you.

I personally really like the Prodrive bump stops up front for STI guys.

Great find, though, this site has tons of stuff!
...i spend almost an hour reading there...REALLY good stuff, no doubt

GREAT find, Mike
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Old 09-26-2007, 10:43 AM   #8
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The selection, is mind boggling. Thanks!
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Old 11-02-2007, 03:16 PM   #9
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BIGSKYWRX, how you suggest someone go about selecting a dumpstop?
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Old 11-02-2007, 06:23 PM   #10
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The first thing you have to be armed w/ is how much bump travel you currently have and the length of your current bump stop. The oe front ones (WRX) are 59mm and fully compressed at 16mm- progressive in nature. I didn't really want to be in the bump stops (unless it was a big bang) so opted to go to a shorter one that Ground Control oFfered- they are made by Koni ( I actually got two different ones). Pic- the oe (softest) is on the right (59mm), the firm one (47mm) on the left and the "medium" (52mm) is in the middle- it's also progressive like the oe one- it's the one I went w/.

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Old 11-02-2007, 06:38 PM   #11
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Any suggestions for the Koni insert guys? I haven't picked up a set, so I have no current means of measurement....was hoping to pick everything up at once.
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Old 11-02-2007, 06:42 PM   #12
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what springs? the amount of lowering makes a huge difference on available bump travel
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Old 11-02-2007, 07:36 PM   #13
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I was actually looking at using the koni inserts as well. For springs, the RCE "Regular Guy" springs, and getting the D_rex Koni strut extenders. But I might not need the extenders, unless I go to the RCE Yellows. So I'm not really sure how much bump travel I'd have with either of those two setups. But if I find that, I assume I make the adjustment to shorten the bumpstop the difference in travel, while keeping the fully compressed force the same as OE. But I've got no clue what the OE measures at.
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Old 11-02-2007, 08:15 PM   #14
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Quote:
Originally Posted by BIGSKYWRX View Post
what springs? the amount of lowering makes a huge difference on available bump travel
Koni's on wagon donor struts with 06 STi take-offs....15-20mm drop, no?
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Old 11-02-2007, 08:26 PM   #15
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oe bump travel measure 70mm at oe height (59 of this being bumpstop) as you can imagine your into the bumpstops a lot w/ the oe set if your turning much

my Koni setup gives me 62mm of bump travel w/ 30mm lowering (part of the travel is due to the RCE plates which add back 8mm) even w/ double the oe spring rates I still decided to go slightly shorter w/ the bumpstops

Last edited by BIGSKYWRX; 11-02-2007 at 08:36 PM.
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Old 11-02-2007, 08:40 PM   #16
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these pics (courtesy of ercid ) show Koni's at oe height, 20mm lower and 35mm lower





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Old 11-02-2007, 09:06 PM   #17
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Quote:
Originally Posted by BIGSKYWRX View Post
oe bump travel measure 70mm at oe height (59 of this being bumpstop) as you can imagine your into the bumpstops a lot w/ the oe set if your turning much

my Koni setup gives me 62mm of bump travel w/ 30mm lowering (part of the travel is due to the RCE plates which add back 8mm) even w/ double the oe spring rates I still decided to go slightly shorter w/ the bumpstops
Yet another reason I'm a proponent of the RCE lowering tops. I'll take as much of that extra travel as I can get.

Is the bumpstop compressed in ercid's 3rd picture (35mm lower)? Or is the insert up next to it?
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Old 11-02-2007, 10:33 PM   #18
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BIGSKYWRX, thanks for the information.
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Old 11-03-2007, 10:08 AM   #19
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Quote:
Originally Posted by sixtoo View Post
Yet another reason I'm a proponent of the RCE lowering tops. I'll take as much of that extra travel as I can get.

Is the bumpstop compressed in ercid's 3rd picture (35mm lower)? Or is the insert up next to it?
I think it's right at it- maybe smidge into it. If you ever have the oe one in your hand you'll see it's very progressive- starts out very soft as you compress it becomes stiffer- at 16mm it fully compressed.
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Old 11-15-2007, 08:22 AM   #20
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The RCE springs on a wagon thread got me thinking about bump stops, so I thought I'd ask here...
I am considering a Koni insert/RCE wagon springs/non-lowering front camber plate combination. Based my reading, the RCE wagon springs lower 25-30 mm and BigSky reports above that the Konis with the STI Tarmac springs (30 mm lowering) and RCE lowering plates (+8 mm bump travel) give him 60 mm of bump travel. Therefore, with the spring/strut combo I am considering, I would have 52-57 mm of available bump travel up front. Looking at the bump stop montage page linked to in the first post, would there be any problems with using a shorter bump stop (say in the 35-45 mm range) with a higher durometer to give me more bump travel before I ride on my bumpstops? When would coil bind become a factor? Or should I seriously consider the D_rex Koni Strut Extenders from Turn-in-concepts?
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Old 11-15-2007, 08:35 AM   #21
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Quote:
Originally Posted by thorongil View Post
The RCE springs on a wagon thread got me thinking about bump stops, so I thought I'd ask here...
I am considering a Koni insert/RCE wagon springs/non-lowering front camber plate combination. Based my reading, the RCE wagon springs lower 25-30 mm and BigSky reports above that the Konis with the STI Tarmac springs (30 mm lowering) and RCE lowering plates (+8 mm bump travel) give him 60 mm of bump travel. Therefore, with the spring/strut combo I am considering, I would have 52-57 mm of available bump travel up front. Looking at the bump stop montage page linked to in the first post, would there be any problems with using a shorter bump stop (say in the 35-45 mm range) with a higher durometer to give me more bump travel before I ride on my bumpstops? When would coil bind become a factor? Or should I seriously consider the D_rex Koni Strut Extenders from Turn-in-concepts?
As far as I am concerned, the more travel you can get the better off you are. Adding another inch of travel to the 52mm you are looking at would not be a bad thing. Combine it all together and have lots of travel on hand.

One thing we have learned throughout our AST project is that suspension travel is king on the street and the best way to maintain control and still have decent ride.

Tony
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Old 11-15-2007, 10:03 AM   #22
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There is plenty of droop up front so adding another 1" of bump via the extender (and loosing 1" of droop) won't hurt a thing.

I have found the 60mm of bump travel I have is more than sufficient (my spring rates are a little higher than the RCE ones mind you), my bumpstop is the middle one in the pic ~ 52mm

you can also see from the pic that taking off the softest nub of the oe stop will yield you ~ 45mm- I think a stop (w/o the extenders) in the 40-45mm range should be just about right. with the extenders you could probably leave the oe stop as is

it would be neat if we could send in a oe stop to the above outfit and have them dyno it, might give you more info on which one to choose
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Old 11-15-2007, 10:33 AM   #23
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/me gets to measurin'...
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Old 01-02-2008, 09:58 AM   #24
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Need a suggestion...

'02 WRX Wagon
Tokico D-specs
'04 WRX Wagon stock springs
Group-n tops all around

The car is going to be used for rally-x.

Should I just find a set of stock bumpstops? They are crazy expensive from the dealership.
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Old 01-02-2008, 11:09 AM   #25
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I take it your not reusing the ones you already have? I'd go stock length w/ stock springs- yeah they don't exactly give them away You could probably find some used (if you want I can dig around and see what I've got).
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