Rear chassis reinforcement
 

Figured it would make sense to start a thread on chassis reinforcement especially the rear of our cars. It would be interesting to see what some others have done to keep their cars together when pursuing those chassis bending torque figures, even ideas on the subject would be helpful after all what good is power with out control.

Iv dont absolutely nothing ;) Under peak torque you can feel my whole rear subframe/diff twist,i had the rear subframe out last week and theres evidence the bushes are frequently bottoming/rubbing on the stops,have thought about installing harder mounts but dont want the noise.

I guess the easy upgrade would be to make custom rubber mounts for the diff and subframe,and if thats not enough strengthen the subframe with welded or bolt on support.

I have got a reinforced subframe and i'm going to be working on the chassis when i get the chance to drop my subframe and a set of new bushes should stiffen up things back there and I have seen some interesting rear CR (chassis reinforcement) setups on subaru's that and am thinking of using a similar setup on my 190.

http://img55.imageshack.us/img55/246...raceaa1lh1.jpg
Subaru

http://www.ninjapower.co.uk/images/product/KSZ101.jpg
mazda

http://www.flyinmiata.com/images/mis...s/IMG_9008.jpg
Miata

http://img7.imageshack.us/img7/200/33980004wu7.jpg
another Subaru

http://www.junauto.co.jp/products/re...g/s2000-02.jpghttp://www.junauto.co.jp/products/re...g/s2000-06.jpg
Honda S2000

I have solid mounts on my subframe and my differential. They are made of uhmw plastic, much cheaper than delrin. Same stuff as plastic hammers for metal working. The subframe mounts got rid of the shifting in the rear that you feel under high power. It used to feel like it was walking in the back. Kind of back and forth. I also made several solid pivot points for my suspension. Tie rod ends and lower control arms but this was also to get the alignment in spec with the drop.
I think getting rid of flex and movement will help a lot with failure also.

Did it increase road noise/vibration much?

Not really. Plastic is pretty deadening. I would not say that it is very noticeable in that respect. Probably gear engagement is the most noticeable in harshness but my engine mounts are by far the most annoying noise and vibration transfer. In fact I think I have finally come up with a design for that that my meat my needs.

Finally a thread about the most important thing..the chassis !!! :cool:

Ability to make engine power has not increased over the years...

Fifty years ago there were top fuel multi front engine drag car ( Ivo, Thompson, etc ) that were making 1000HP +...
Yet only able to run low 7 second around 195MPH..

Now a top fuel dragster can run mid 4's @ 320+ mph...

What has changed to go so fast?
Tires and chassis which control the power and get it to the ground !! :D

Taint..

If you're going to make claimed "mega power " then look beyond just reinforcing the rear sub frame..
Optimum is to connect the front and rear subframes which in essence mods the uni-body to a body on chassis design.

Front and rear lateral strut braces along with rigid engine torque strap also reduces flexing...

Just old tricks that go back to when Chrysler introduced the unibody in the sixties and put high horsepower big blocks in them.

Much more difficult to strengthen an independent suspension chassis but it can be done...

Ed A.

lol mega power not at all I intend to drive my car daily.

but thanks for the info I hadnt thought of reinforcing the front and then conecting the two, hmmm time to bust out the autoCAD. Out of curiousity have you done anything to your twin turbo for reinforcment.

Some fab work
 

http://i108.photobucket.com/albums/n1/2benchanted/IMG00062-20101214-1545.jpg
Here is my rear shock brace
http://i108.photobucket.com/albums/n1/2benchanted/Mercedes%20606%20turbo/IMG00058-20101213-1351.jpg
and a lower brace for the rear control arm brace