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Chassis Strengthening - FD3S

Old 05-08-07, 01:53 AM
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Chassis Strengthening - FD3S

Hey Guys,

I have been lurking these forums for a long time now, you have all helped me tremendously with my track project thus far and i hoping you can help some more.

I'm currently building up a FD and I'm at the point of seam welding and add roll cages and what not. Now I'm looking to stiffen the car up as much as possible (within reason obviously) and have almost completed the seam welding and am currently sourcing a cage.

I have been told to use expandable foam in the cavities of the chassis as this is supposed to be of massive benefit.

Has anyone here heard anything on this in regards to FD's or had any experience with using this at all?

The car is a dedicated circuit/drift (mainly circuit) car and i want to do it right the first time.

Thanks in advance,

- Neil
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Old 05-08-07, 05:35 AM
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I doubt the foam would do much if you're allready running a cage.
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Old 05-08-07, 11:35 AM
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I personally hate the foam thing, heres why
1. over time it will degrade, causing what ever unknown affect it had to change.
2. if it gets wet...which it will it will retain the moisture and eventually rot
3. It makes future welding in the area all but impossible...also a fire hazard
4. its benefits have never actually been tested....IE I have never seen a swist test done before and after, so its usefullness is purelly word of mouth amongst club racers.

a properly built cage should give you all the rigidity you need....if it doesn't then you need to look at adding / changing some tubes untill it does.
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Old 05-08-07, 05:21 PM
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Originally Posted by sereneseven View Post
I personally hate the foam thing, heres why
1. over time it will degrade, causing what ever unknown affect it had to change.
2. if it gets wet...which it will it will retain the moisture and eventually rot
3. It makes future welding in the area all but impossible...also a fire hazard
4. its benefits have never actually been tested....IE I have never seen a swist test done before and after, so its usefulness is purely word of mouth amongst club racers.

a properly built cage should give you all the rigidity you need....if it doesn't then you need to look at adding / changing some tubes until it does.
Thanks for your response. These were my exact thoughts also, but i have had a number of people rave on about it to me about how good it is. Most of these guys run in the Gemini series over here in Australia.

I think i will give it a miss and just go for the cage and do the seam welding through out for now.

If anyone has any other suggestions or idea for adding strength post away please.

- Neil
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