Theory on bobblehead and fixing the bouncy seat - Page 2

chaos311clarity · 01-17-2008, 06:25 AM

Quote:

Originally Posted by RaceComp Engineering

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.

Same thing in maryland on RT 97 going NORTH after you pass under RT 100. You want to test the seat theory someplace?..THATS the place for us local MD guys. Same thing as in NJ on the turnpike..constant bounce.

Myles

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

***snorky*** · 01-17-2008, 08:21 AM

I'm interested in #4. This would be my last stop before new seats. I have a sore left knee the day after track and autox because i'm bracing myself using the dead pedal so much.

Quote:

Originally Posted by fullerton

That has nothing on 355 in the west suburbs of chicago. From 88 to 290, that road is bounce after bounce.

I can't imagine having boobs on that stretch.

It's fun to have a set in the passenger seat. It's hard to keep your eyes on the road though. Bobblehead is now officially a liablility!

stretch · 01-17-2008, 09:46 AM

Quote:

Originally Posted by fullerton

Stretch- Someone (slidewaysteve) already tried a version that is between your idea and mine. While they did remove the springs from the equation (my idea), they lowered the seating height also (your idea...kinda).

That's not really what I had in mind for #4. The goal is not to pull the springs down- it's just a byproduct of my idea. The real idea is to reduce the spring frequency by adding a load that pulls in the opposite direction. This will still allow the seat to have a spring motion, except the seat will think it has a 400lb man in it instead of a 200lb man. This lowers the spring frequency of the seat which I hope will make it more comfortable.

chaos311clarity · 01-17-2008, 09:48 AM

what about removing that spring completely with some metal shears? lol

fullerton · 01-17-2008, 11:28 AM

Quote:

Originally Posted by chaos311clarity

what about removing that spring completely with some metal shears? lol

I know you're joking, but that would cause other problems.

fullerton · 01-17-2008, 11:31 AM

Quote:

Originally Posted by stretch

That's not really what I had in mind for #4. The goal is not to pull the springs down- it's just a byproduct of my idea. The real idea is to reduce the spring frequency by adding a load that pulls in the opposite direction. This will still allow the seat to have a spring motion, except the seat will think it has a 400lb man in it instead of a 200lb man. This lowers the spring frequency of the seat which I hope will make it more comfortable.

Hence the "your idea...KINDA" disclaimer. I am just suggesting that you could use the bars that are parallel to the car's direction of travel to secure your "opposite direction load".

stretch · 01-17-2008, 12:24 PM

Ah, gotchya gotchya.

blindfold · 01-17-2008, 02:24 PM

So does bottom of the seat(white cloth) actually touch the springs when weight is applied? If so maybe cutting the middle spring would help some...total seat newb here

Has anyone confirmed that seats out of all year STis are the same? I sat in a passenger side seat of a friend's 06 STi and it felt smaller and less bouncy than my 04 larger driver's side seat. I was the second person to tell him that too.

fullerton · 01-17-2008, 03:19 PM

iirc boon, the springs always touch the seat bottom.

mtskibum16 · 01-17-2008, 05:49 PM

Rather than removing all of the springs, you could either stretch them out or remove one or two of them leaving the rest in place. This would also lower the overall spring rate of the seat but you wouldn't have to rig up bungy cords to the bottom.

I removed a spring from the back of my seat and it made a huge difference! It was always SO stiff on my lower back and in certain situations i think adds to the "bobble head". An example is when your rear wheels go over a bad bump and since your seat in reclined you get a portion of that force pushing up through the back of the seat as well. Removing a spring from the back not only made the seat more comfortable, but it also helped to give that "sitting in the seat, not on it" feeling, while at the same time taking some of the bounce out of the ride. I have been meaning to do this to the seat bottom as well and I am confindent that the combination of the two will provide a drastically different riding seat (that will also hold in the corners better).

stretch · 01-17-2008, 06:04 PM

Quote:

Originally Posted by mtskibum16

Rather than removing all of the springs, you could either stretch them out or remove one or two of them leaving the rest in place. This would also lower the overall spring rate of the seat but you wouldn't have to rig up bungy cords to the bottom.

Wow, that's an even better idea!!! Good work. I am going to do just that- I'll remove the middle spring, then put a piece of thin aluminum accross to bridge the other two springs together. It's a brilliant idea and exactly what I was hoping to accomplish!

***LeiboWRX*** · 01-17-2008, 06:34 PM

As suggested above, I simply put vice grips on them and stretched them out about 25% about 2 years ago. Now I have nearly no bouncing.

Lurker · 01-17-2008, 08:10 PM

Quote:

Originally Posted by stretch

...then put a piece of thin aluminum accross to bridge the other two springs together....

Ahh, and there is the light weight solution I've been looking for,

**RaceComp Engineering** · 01-18-2008, 03:10 AM

Quote:

Originally Posted by LeiboWRX

As suggested above, I simply put vice grips on them and stretched them out about 25% about 2 years ago. Now I have nearly no bouncing.

I will try this on the Legacy.

mw

Boxer · 01-18-2008, 05:07 AM

I can't seem to find any pic tutorials involving modifying the stock seats. Kindly post something if deciding to try one of these solutions. Thanks.

01-17-2008, 09:48 AM	#19
chaos311clarity STI Guru Car: 05 CGM STi Fav Mod: grip. Location: Southeastern PA Posts: 5,618 Join Date: Aug 2006 Trader Rating: (7)	Re: Theory on bobblehead and fixing the bouncy seat what about removing that spring completely with some metal shears? lol

01-17-2008, 12:24 PM	#22
stretch Silver Member Car: Aspen 2005 STi Fav Mod: TurnInConcepts.com Coilovers Location: Silver Spring, MD Posts: 1,784 Join Date: Mar 2006 Trader Rating: (2)	Re: Theory on bobblehead and fixing the bouncy seat Ah, gotchya gotchya.

01-17-2008, 02:24 PM	#23
blindfold Silver Member Car: 2004 WRB STi Location: Atlanta,GA Posts: 1,901 Join Date: Aug 2006 Trader Rating: (14)	Re: Theory on bobblehead and fixing the bouncy seat So does bottom of the seat(white cloth) actually touch the springs when weight is applied? If so maybe cutting the middle spring would help some...total seat newb here Has anyone confirmed that seats out of all year STis are the same? I sat in a passenger side seat of a friend's 06 STi and it felt smaller and less bouncy than my 04 larger driver's side seat. I was the second person to tell him that too.

01-17-2008, 03:19 PM	#24
fullerton abracious Car: AW GDF-D Fav Mod: Track time Location: Near a 100oct pump Posts: 16,330 Join Date: Oct 2005 Trader Rating: (10)	Re: Theory on bobblehead and fixing the bouncy seat iirc boon, the springs always touch the seat bottom.

01-17-2008, 05:49 PM	#25
mtskibum16 Professional STI Driver Car: 05 Subaru WRX STi Location: Montana Posts: 461 Join Date: May 2006 Trader Rating: (1)	Re: Theory on bobblehead and fixing the bouncy seat Rather than removing all of the springs, you could either stretch them out or remove one or two of them leaving the rest in place. This would also lower the overall spring rate of the seat but you wouldn't have to rig up bungy cords to the bottom. I removed a spring from the back of my seat and it made a huge difference! It was always SO stiff on my lower back and in certain situations i think adds to the "bobble head". An example is when your rear wheels go over a bad bump and since your seat in reclined you get a portion of that force pushing up through the back of the seat as well. Removing a spring from the back not only made the seat more comfortable, but it also helped to give that "sitting in the seat, not on it" feeling, while at the same time taking some of the bounce out of the ride. I have been meaning to do this to the seat bottom as well and I am confindent that the combination of the two will provide a drastically different riding seat (that will also hold in the corners better).

01-17-2008, 06:34 PM	#27
*LeiboWRX* Platinum Member Car: 04 JBP STi Fav Mod: 11.5:1 Q-Rack Location: Rochester, MN Posts: 343 Join Date: May 2003 Trader Rating: (0)	Re: Theory on bobblehead and fixing the bouncy seat As suggested above, I simply put vice grips on them and stretched them out about 25% about 2 years ago. Now I have nearly no bouncing.

01-18-2008, 05:07 AM	#30
Boxer Spec C Club Location: FL Posts: 1,484 Join Date: Jan 2004 Trader Rating: (0)	Re: Theory on bobblehead and fixing the bouncy seat I can't seem to find any pic tutorials involving modifying the stock seats. Kindly post something if deciding to try one of these solutions. Thanks. This ad is not endorsed by this member. Please register or login to hide this ad.