Chassis Reinforcement
Oct 29, 2006 | 07:16 PM
#16
some more links
I will add relivent links I find here as I research
http://www.ten-tenths.com/forum/showthread.php?t=89140
http://www.i-car.com/html_pages/tech...4/060704.shtml
http://www.i-car.com/html_pages/tech...5/071105.shtml
I will add relivent links I find here as I research
http://www.ten-tenths.com/forum/showthread.php?t=89140
http://www.i-car.com/html_pages/tech...4/060704.shtml
http://www.i-car.com/html_pages/tech...5/071105.shtml
Last edited by andenbre; Oct 29, 2006 at 07:29 PM.
Oct 29, 2006 | 07:39 PM
#17
Originally Posted by xX v0oDo0 Xx
Dude, please try reading...No one is implying this, I started this thread with the sole intention to find out if this procedure was popular or not...God, I think sometimes people are just feeding off the last dude's post on the page instead of reading the core post, supplied by the thread starter...For the 3rd time now, I am in no way deeming urethane as an alternative to roll-cages...However, judging only from what I heard in the video, this type of modification improves stiffness and chassis reinforcement (yes, a few benefits of roll-cages)...I do not know much about this modification, which is why I started the thread in the first place...Judging from the video, this would allow for a more-rigid structure which could be very useful for people like me who like to auto-x...I in no way expected a roll-cage vs. urethane battle to emerge...There is no replacement for bars, you're right...But, not everyone needs a jungle gym in their car either (i.e. an auto-xing stock IX)...So, having said this, don't you think this is a descent segway for those who realistically won't roll over?...Well, this is why I brought the topic up and why this procedure gauged my interest...
Special thank you to x838nwy, TonyMS, and andenbre for relevant feedback...I guess every mod has pros/cons, right? haha
Nov 24, 2006 | 08:08 AM
#19
it doesn't have to be rigid. are your suspension links rigid? nope. what are they attatched to. metal.
same concept here. it works no doubt about it. if you look at the cross sections of many portions of the car... they're squares or trapezoids... those shapes are not space frame like and will distort with ease. putting something inside of them mitigates some of it.
same concept here. it works no doubt about it. if you look at the cross sections of many portions of the car... they're squares or trapezoids... those shapes are not space frame like and will distort with ease. putting something inside of them mitigates some of it.
Jan 12, 2008 | 02:37 AM
#21
bump...i'm thinking about doing this to my Subaru 2.5RS since the chassis flexes quite a lot - for reference the GD chassis is something like 180% stiffer or something lol
can't find any info on the subaru forums so i'm coming back to my roots
so basically watch out and don't pour too much since it could occupy more than the original designated space - is there a way to do this and not make your car sound like a tank from the inside?
anybody has anything more to add? thanks in advance
can't find any info on the subaru forums so i'm coming back to my roots
so basically watch out and don't pour too much since it could occupy more than the original designated space - is there a way to do this and not make your car sound like a tank from the inside?
anybody has anything more to add? thanks in advance
Jan 19, 2008 | 05:47 PM
#23
i used this type of mod as an injectable foam (it is similar in prinicple to jb weld an such, an epoxide resin) in my e46 bmw. this was to prevent rear subframe tears. funny, bmw increased the number of spotwelds after 2002....
i doubt very much if it stiffens anything 'cos flexes with the metal, but it definitely improves structural integrity as it bonds stuff together.
i doubt very much if it stiffens anything 'cos flexes with the metal, but it definitely improves structural integrity as it bonds stuff together.
Jan 21, 2008 | 10:24 PM
#24
lets kick start this thread a bit...
I found this build as well as the full body of work of Opera to be very inspirational.
http://www.sportcompactcarweb.com/fe...000/index.html
Pay special attention to the lengths they go to in order to save weight and make things stiffer AND safer.
I for one like the idea of using foam as part of an overall system by which we take out weight and add stiffness. Companies will not do this from the factory as it costs too much for all the labor and it's simply not needed for street cars but for what most of us need we can trade some labor and effort for a superior chassis.
As for sound of a stiffer chassis, just because it's stiffer will not mean it's louder.
I found this build as well as the full body of work of Opera to be very inspirational.
http://www.sportcompactcarweb.com/fe...000/index.html
Pay special attention to the lengths they go to in order to save weight and make things stiffer AND safer.
I for one like the idea of using foam as part of an overall system by which we take out weight and add stiffness. Companies will not do this from the factory as it costs too much for all the labor and it's simply not needed for street cars but for what most of us need we can trade some labor and effort for a superior chassis.
As for sound of a stiffer chassis, just because it's stiffer will not mean it's louder.
Feb 11, 2008 | 02:22 PM
#25
Evolving Member
Joined: Sep 2007
Posts: 398
Likes: 0
From: Dubai
Heck, if it:
a) provided measurable benefits
b) was cost effective
c) were easy to get installed by experienced professionals
then I'd check it out for sure!
Would be especially interested to find out about the merits of chassis foam injection vs. seam welding etc.
However, having said that, I don't think going through this process would be worth it on a car that's not extremely powerful (and twisting the chassis due to excessive motor torque etc.) or you're tracking your car and running slicks/semislicks that would be putting such high stresses on the chassis that it would make sense to go through all the effort to reduce flex.
I do remember seeing this on a best motoring vid or something from Japan...could be the same vid previous posters were referring to. Looked like a very interesting technique but I'd hate to get it wrong and pop the chassis apart
To those who have posted links, thanks for the info.
a) provided measurable benefits
b) was cost effective
c) were easy to get installed by experienced professionals
then I'd check it out for sure!
Would be especially interested to find out about the merits of chassis foam injection vs. seam welding etc.
However, having said that, I don't think going through this process would be worth it on a car that's not extremely powerful (and twisting the chassis due to excessive motor torque etc.) or you're tracking your car and running slicks/semislicks that would be putting such high stresses on the chassis that it would make sense to go through all the effort to reduce flex.
I do remember seeing this on a best motoring vid or something from Japan...could be the same vid previous posters were referring to. Looked like a very interesting technique but I'd hate to get it wrong and pop the chassis apart
To those who have posted links, thanks for the info.
Feb 27, 2008 | 04:43 AM
#26
Urethane injection is:
- cost effective
- easy to do (you just have to measure how much to mix)
- it is not a roll cage substitute (doesn't protect) just make chasis stiffer
- it is popular in Japan, especially in drift cars
- cost effective
- easy to do (you just have to measure how much to mix)
- it is not a roll cage substitute (doesn't protect) just make chasis stiffer
- it is popular in Japan, especially in drift cars
Feb 27, 2008 | 05:33 AM
#27
No its not called "great stuff"
Urethane and that home depot foam crap are two completely different things.
On provides sound deadening and insulation, while the other is meant to help "fill in" the areas in the uni-body for added rigidity. Trust me it works, my entire car is filled with it.
Urethane and that home depot foam crap are two completely different things.
On provides sound deadening and insulation, while the other is meant to help "fill in" the areas in the uni-body for added rigidity. Trust me it works, my entire car is filled with it.
Feb 28, 2008 | 05:27 PM
#28
I was reading the shop manual on body repair on EVO's.
The Evo already uses urethane foam as a reinfocement about the rear doors and some other areas.
So I think it is safe to say that it works.
Doing it right might be a challenge.
Mitsuatb
The Evo already uses urethane foam as a reinfocement about the rear doors and some other areas.
So I think it is safe to say that it works.
Doing it right might be a challenge.
Mitsuatb
Feb 29, 2008 | 12:14 AM
#29
Evolved Member
Joined: Dec 2003
Posts: 1,074
Likes: 0
From: UK
a trick i have seen the V8 Miata guys go is to bolt sections of C section steel to the sills of the car. basically you are just adding some metal to help strengthen the chassis. its not the best solution but it helps.
if you want the ultimate in strength then you need to be looking at seem welding the chassis and having a proper weld in cage made for the car. if you build the cage so it extends to the front shock towers, through the dash and braces the towers diagonaly then you will have a very stiff front end.
Chris.
if you want the ultimate in strength then you need to be looking at seem welding the chassis and having a proper weld in cage made for the car. if you build the cage so it extends to the front shock towers, through the dash and braces the towers diagonaly then you will have a very stiff front end.
Chris.
Mar 2, 2008 | 05:24 PM
#30
No its not called "great stuff"
Urethane and that home depot foam crap are two completely different things.
On provides sound deadening and insulation, while the other is meant to help "fill in" the areas in the uni-body for added rigidity. Trust me it works, my entire car is filled with it.
Urethane and that home depot foam crap are two completely different things.
On provides sound deadening and insulation, while the other is meant to help "fill in" the areas in the uni-body for added rigidity. Trust me it works, my entire car is filled with it.
1) how heavy is this stuff after it's expanded (lb/ft3)
2) where can I buy some?
I want to use this on the support structure of my CF trunk lid, because right now the trunk lid flexes too much when the wing is under load at high speeds. Thanks!