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Old 04-30-2010, 09:21 PM   #1
bobturismo
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Default Anyone want to split the cost of poly foam for stiffing your chassis?

Quote:
Originally Posted by 300zxClub
Structure Foam Injection - Tales Of Magic Foam Revisited.

Years ago when I looked into chassis stiffening, Mike Kojima from Sport Compact Car was already doing it for their 300ZX magazine project. I was so impressed with the well written article I figured I would just throw it up on here for those that never got the chance to glance through it.

“In any high-performance car, it is impossible to make the chassis too stiff. The stiffer the chassis, the higher its natural frequency, making the energy imparted to it by bumps less likely to excite the body's structure. A stiffer chassis enables the use of stiffer springs and shocks without hurting the ride. This is because a stiff, non-flexing chassis transfers more force into the suspension where it can be dissipated by the springs and shocks instead of transferring the force to the occupants. A stiff chassis is also more responsive to roll rate tuning for balancing understeer and oversteer. This is one of the reasons why automotive engineers are continually investigating ways to stiffen chassis without adding weight.

In a final bit of reengineering to stiffen the body, we injected the chassis with catalyzed rigid structural polyurethane foam. Structural foam, in the 2 lb per cubic foot density that we used, can stiffen chassis members up to 40 percent.

Higher densities of foam can increase stiffness by up to 300 percent. Since we cannot retool custom parts to redo the Z's body, we figured that this would be an excellent, low-cost way of greatly increasing chassis stiffness. Injecting foam is not a new technique for chassis stiffening. The Infiniti Q45 uses this sort of foam in some of its chassis members to increase stiffness, as do a few other premium cars. In fact, the foam we chose is the foam recommended to repair damaged Q45s.”

He also went on to mention “We were amazed at how this simple procedure improved the performance of the car. The chassis now almost feels like it has a roll cage. A sloped driveway can be driven up sideways with nary a creak. Even though the Z already has a pretty tight chassis, it feels more solid. The ride has improved and road noise has been reduced noticeably. We bet that the car will be even more responsive to chassis tuning measures in the future. If you are a slalom racer, a road racer, have a lowered car or even just want a smoother ride; foaming is a worthy, easy-to-do modification.””
As far as the process and products available some things have changed since this articles better days. ITW Foamseal is no more but a company called FOMO has taken their place. FOMO has also made the 2 part foam kits available via Grainger, so it’s readily available to the public.



The part that I have used is #2TE59 and is just over $500 but this is enough foam to do 2 cars. The smaller cheaper kit is actually a different strength foam, so your only option is this stuff but remember two things. Take out everything, I mean everything interior wise that you don’t want to get foam on. Prep and cover all your holes as this is expanding foam and will work it’s way into every small wedge of an enclosure. I plan to do a write-up on this later so keep an eye out.

Here is a pic from my Z32 foam injection experience with Project LOWFATZ. Notice the layout of the seam weld lines and also notice the normally empty section now filled with structure foam to aid in rigidity.
the better foam is $600 at grainger, supposedly enough to do 2 cars. I'm not doing a whole car, so whoever split it with me would get as much as they need. (as long it's not a whole lot more of half unless you want to cover more of the cost appropriately.


Or even 4 people that just want to do half of their car or the A-pillars or wahtever.

Just chime into this thread and we'll work out the details, we can divide it by weight, I'll pay for the remanding since I only need for small pieces.
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Old 05-01-2010, 04:49 AM   #2
SubeSTIle
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what are you using it for?
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Old 05-01-2010, 05:00 AM   #3
bobturismo
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Default

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Originally Posted by SubeSTIle View Post
what are you using it for?
I'm gonna wait till you're sleeping and cram it down your throat and fill your guts with it...why?
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Old 05-01-2010, 02:13 PM   #4
KP
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that's not very nice of you...
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Old 05-01-2010, 04:15 PM   #5
Smoby
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Default

probably to stiffen the A-pillars

He is asking because he maybe wants to do the same to his car :P
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Old 05-01-2010, 05:42 PM   #6
kpluiten
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Now with 100% more Spec-C

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that's not very nice of you...
Shut up. Yore next!
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