just curious what can be done to making for a stiffer chassis

already know roll cage
and front/rear strut tower brace

but what else is there?

isn't there some sort of tie for the lower arms on the front of the susp as well?


also aware that for mustangs and camaro/firebirds they make sub-frame connectors could a set be made for the rx7 and would it make much difference?


and with the front/rear strut tower brace how much of a difference do they really make?

 

I know that Cusco makes a lower arm bar, and so does Mazdaspeed does as well.
As far as subframe connectors, I am not sure. I know about these from Corksport.


And something else that is helpful for chassis stiffening, is seam welding.

 

what would I seam weld?

 

everything

 

those crossmembers r pretty cool. who makes them?

 

auto exe

 

You could strip out the the whole car, fill the cars frame with polyurithane. That will stiffin it up about.... 45%!

or add a rollbar for about 15%

The front and rear Strut tower bars make a very large difference, enough to notice.

 

Seam welding is awsome too.

 

After Springs and Struts, Energy Suspension Polyurethane Bushings will tighten It up. Awhile at It, replace the DTTS stock Bushings. They are probably erroded as any 15 yr old+ car can be. Now you are talking firm.

 

whats with this seam welding thing?

 

all the seams on your cars chassis have some amount of flex to them, if you seam weld them (a spot every inch or so) it makes them flex less

 

Turn the rear diff mounts upside down so the rubber faces down. Solid rear diff mounts

 

where are the weak spots in the FC chassis?

 

does it make the car ... 45% heavier too ?

 

 

no the foam does not make the car heavier. My dad's had 2 Ferrari's. 348 targa without the foam in the frame and the 355f1 with the foam in the frame and it had zero body roll in the corners and handled like a dream. this summer I am looking into getting this done to my vert.

 

there are no certain spots that I can think of. its the chassis as a whole.

 

No. I does add about 100 or so pounds, but what you get back from the fill is a rocksolid car. Moto on www.club4ag.com did it to his car.

 

Foam fill the frame:

http://www.itwfoamseal.com/auto_aftermarket.htm

 

Isnt seam welding the same as a full seam weld.
I dont think you want your car to limb around on three "legs"

Im sure spot welding is the word

 

put in a cage

 

ok if I was to try to make a set of sub frame connectors where would I try to put the mounting points?

 

Subfrome connectors for mustangs run the entire length of the floorpan. Our subframe already does that, so its not necessary.

The foam makes a HUGE difference to the car.

 

have you actually done it? or just repeating what everyone else has said?


if so, how difficult/how much to have it done?

 

Of course I have done it. I am the type to buy the 10 at once so that I can do it to others, and can't afford to miss out on a deal .

It wasn;t that hard. Remove sill plates, drill some slightly larger holes, mix foam, pour in, make sure car is on ground (wheels touching), wait to cure, then cut off excess.
That is the basic install, I installed it in a couple extra places