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Go Back   IWSTI.com: Subaru STI Forums > STi Technical Discussion > Suspension, Handling, & Stiffening


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Old 04-07-2008, 03:37 PM   #61
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Default Re: Theory on bobblehead and fixing the bouncy seat

Yeah,I pulled the crap out of my back springs and zip tied the lower ones with super heavy duty zip ties. Worked wonders, probly guna pull the back springs even more. I dont care if the fabic starts to stretch due to more slack underneath. It's worth it!


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Last edited by tyler_sti : 04-08-2008 at 05:16 PM.
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Old 04-07-2008, 03:39 PM   #62
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Default Re: Theory on bobblehead and fixing the bouncy seat

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Originally Posted by tyler_sti View Post
Yeah,Ipulled the crap out of my back springs and zip tied the lower ones with super heavy duty zip ties. Worked wonders, probly guna pull the back springs even more. I dont care if the fabic starts to stretch due to more slack underneath. It's worth it!
I've been driving with mine stretched for some time. I really like the feel.
I wish the lower lumbar area could stretch a bit more. It seems like the upper springs are longer and hence softer and easier to stretch.
The lower back spring is less compliant. I may actually just cut that one out.
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Old 04-07-2008, 03:40 PM   #63
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Default Re: Theory on bobblehead and fixing the bouncy seat

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Originally Posted by RaceComp Engineering View Post
The place that this is WORSE is on the NJ turnpike from exit 5 to exit 7. There is a rimple in the road that makes these cars just bounce , bounce, bounce. CONSTANTLY. Its probably under the asphault from YEARS ago when it was concrete blocks. But as you said......as the car reacts , you react, the seat reacts THEN, it starts all over. STOCK shocks are the worse with stock springs on that stretch of road. I did my first JDMpinks comparison there and later others found that area and couldnt believe that the road was that bad.
Myles
I KNOW THAT ROAD. holy crap, it has made every suspension i've ridden on bounce constantly. even the stock legacy 2.5i was bouncing over it.

what a pos road.
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Old 04-07-2008, 04:28 PM   #64
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Default Re: Theory on bobblehead and fixing the bouncy seat

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I KNOW THAT ROAD. holy crap, it has made every suspension i've ridden on bounce constantly. even the stock legacy 2.5i was bouncing over it.

what a pos road.
yeah thats the place to test the seat revisions for sure.

Mw
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Old 04-07-2008, 08:08 PM   #65
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Default Re: Theory on bobblehead and fixing the bouncy seat

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Originally Posted by reid-o View Post
Since the airbag is in the top half, would it be possible to make a seatcover with the foam inside just for the lower portion of the seat wrapped in a similar material, like a pullover for your ass?
Just a thought.....
That is what Clint and I thought too. We wanted to make something that you could put your current seat cover on top of. The problem is all of that foam is injection molded basically, so we're still working on figuring something out.
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Old 04-08-2008, 09:19 AM   #66
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Default Re: Theory on bobblehead and fixing the bouncy seat

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That is what Clint and I thought too. We wanted to make something that you could put your current seat cover on top of. The problem is all of that foam is injection molded basically, so we're still working on figuring something out.

I was thinking more of something like a Wet Okole cover that mimiced the stock seat fabric rather than having to pull the current cover over something.
My idea is sort of not as nice as integrated as yours, but it solves the problem of the molding.

Well, one other problem I forsee is possibly losing the side bolstering if the cover goes too high (I think you mentioned this in another post).


I was thinking of spandex like material (why don't women ever wear this and who the hell made this go out of fashion?) for the bottom sides in black and the Alcan. material in blue stitched with the foam inside of it.
I don't know if that's possible, but I'd buy one if it were and solved bobblehead or improved ride quality.
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Old 04-08-2008, 09:22 AM   #67
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Default Re: Theory on bobblehead and fixing the bouncy seat

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Originally Posted by reid-o View Post
I was thinking more of something like a Wet Okole cover that mimiced the stock seat fabric rather than having to pull the current cover over something.
My idea is sort of not as nice as integrated as yours, but it solves the problem of the molding.

Well, one other problem I forsee is possibly losing the side bolstering if the cover goes too high (I think you mentioned this in another post).


I was thinking of spandex like material (why don't women ever wear this and who the hell made this go out of fashion?) for the bottom sides in black and the Alcan. material in blue stitched with the foam inside of it.
I don't know if that's possible, but I'd buy one if it were and solved bobblehead or improved ride quality.



I was thinking of something along these lines with more padding just for the bottom. Probably too ghetto for your taste, but it's essentially the same principle without having to remove the stock stuff.


Actually could you add more side bolstering inside such a cover?
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Old 04-08-2008, 03:05 PM   #68
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Default Re: Theory on bobblehead and fixing the bouncy seat

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i know that section of 97 actually... and 202 between malvern and king of prussia up here is the same way as the turnpike discription. wavy lol
You're not kidding... I just put on some wagon pinks and konis and my first ride into work on 202 I got some bobbleheadage. Dampers were on full soft... cranked up the damping a tad and all gone.

Has anyone noticed any effect of tire sizes/pressures?
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Old 04-08-2008, 04:55 PM   #69
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Default Re: Theory on bobblehead and fixing the bouncy seat

I'm still not quite sure i understand the bobble head thing. The only annoyance I get is the sharp deep bumps then tend to send a jolt through the car /seat and your body.

Addmiteddly since i have put the Ohlins on everything has been pretty smooth. Are you saying thet I can get rid og the jolts, as I described, by tighthening up the seat springs?
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Old 04-08-2008, 05:03 PM   #70
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Default Re: Theory on bobblehead and fixing the bouncy seat

If you go over a bump, you will feel a "jolt" no matter what. Thats just what happends when you go over a bump. Bobble head is when you head moves like a chicken, or pigeon on certain roads. Making the seat spring rates stiffer helps with this problem, but does not cure it.
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Old 04-08-2008, 05:10 PM   #71
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Default Re: Theory on bobblehead and fixing the bouncy seat

OK Thanks, well no chickens or pidgeons in my car then. Perhaps the seats are different in the Aus model, also I have leather seats so maybe that helps. Or perhaps the combination with ohlins, prodrive and leather. Anyway it's good to know i don't need to fix a problem I dont have.
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Old 04-08-2008, 05:11 PM   #72
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Default Re: Theory on bobblehead and fixing the bouncy seat

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Originally Posted by hard ride View Post
I'm still not quite sure i understand the bobble head thing. The only annoyance I get is the sharp deep bumps then tend to send a jolt through the car /seat and your body.

Addmiteddly since i have put the Ohlins on everything has been pretty smooth. Are you saying thet I can get rid og the jolts, as I described, by tighthening up the seat springs?
Bobblehead is when you actually lift from the seat for a brief second, sort of like when riding loop de loops (I have no idea how it's spelled) on a rollercoaster.
Quite a bit of is suspension related, but the other part is due to the seat helping launch you in the air.
On really rough pavement, you can be sent back in the air repeatedly and it makes it look like you're a bobblehead.


The other analogy is really akin to when you're having sex.
Bobblehead is the idea of getting launched off the bed with every thrust, which is not so cool, even when making pron. But the jolts and impact you're never going to get rid of. Going hard is going to have some drawbacks.


The jolt is actually what we want.

Last edited by reid-o : 04-08-2008 at 05:16 PM.
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Old 04-09-2008, 02:49 AM   #73
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Default Re: Theory on bobblehead and fixing the bouncy seat

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Originally Posted by reid-o View Post
Bobblehead is when you actually lift from the seat for a brief second, sort of like when riding loop de loops (I have no idea how it's spelled) on a rollercoaster.
Quite a bit of is suspension related, but the other part is due to the seat helping launch you in the air.
On really rough pavement, you can be sent back in the air repeatedly and it makes it look like you're a bobblehead.


The other analogy is really akin to when you're having sex.
Bobblehead is the idea of getting launched off the bed with every thrust, which is not so cool, even when making pron. But the jolts and impact you're never going to get rid of. Going hard is going to have some drawbacks.


The jolt is actually what we want.
lol...thats a good one.

mw
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Old 04-09-2008, 08:34 AM   #74
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Default Re: Theory on bobblehead and fixing the bouncy seat

The STI gives new meaning to the term "Getting Banged for your buck"
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Old 04-09-2008, 11:14 AM   #75
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Default Re: Theory on bobblehead and fixing the bouncy seat

In response to those that suggested some sort of "seat cover" --> it would really suck to lose the side bolstering...

I think the only solution is gonna be some way of removing the stock seat foam, and replacing it (and maybe the springs) with something that doesn't hvae the same characteristics. A under-fabric foam insert would be perfect.


J


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