Having Roll Cage and eliminating some Rear Suspension components
 

I currently have a 4 point rear cage and hopefully next weekend the full cage will be complete. So with the cage (mostly the rear) bracing the body of the car are the two braces underneath the rear body needed? There's two. One that's W shaped and then the rear torsion bars.

I feel with the cage bracing the body of the car and the amount of structural support it has the this small components don't serve a purpose and more and I food remove and save weight there and eliminate useless components.

I removed them because I don't feel they are absolutely needed and also it was interfering with the exhaust I was making.
Yes they do serve a purpose to stiffen more the front attachment.
But the front sub-frame attachment already has another brace. (( 2 actually if you include the W brace that act similar to the V ))

The only big difference between the 350z and 370z is the long V brace that goes from the front main of the sub-frame attachment to the rear middle attachment.

EDIT;
It doesn't show on the picture, but the 350z also has a brace that connect both rear attachment together and bolted to the frame.
Similar to the 370z brace that is shown.

But I would keep that W brace for sure !

http://www.the370z.com/members/megan...-370vs350z.jpg

I donno, it's very low, rearward weight, and it can't be all that much. I'd think any extra stiffness would be worth more than a little weight down there. The W-shaped one does seem a little superfluous, but not so sure about anything else.

That's how I feel. There no absolutely needed. Especially cause the cage braces everything bet ohm all doubt. Hell I wrecked this car one time and the cage saved it from being to totaled. Even when on the frame machine the body was 100% on target. Only the body panels were effected.

Does the Doran car have them?

I love saving weight. I won't be running headlights anymore either. Lol

Im sure you've posted it somewhere but what are you weighing in at now? What will you be filling in the headlight hole with? MCA Suspension has carbon fiber replicas on their 370z...in case you need ideas :tiphat:

Oh, so looking at the diagram again (I haven't been under the rear of my car in a while and it's cold outside :P), the W-shaped bracket and the two long arms that run out to it... they're basically aft of the real suspension, right? Now that puts me more in the mindset of "anything aft of the actual suspension is just to hold up the trunk/exhaust, it can't affect handling" right?

the way I see it is, those brace do serve a purpose of avoiding the long threaded bolt that hold the subframe to bent on either side while there is a load from any direction.


this could affect handling such as modifying camber/toe on heavy load.

In my opinion I can deal with removing the V-brace since the forward portion of the sub-frame is already braced by 2 other one like the 350z

is it optimal ? maybe not.
but removing it on my personal car was to have a much better ground clearance for a future flat bottom / diffuser setup which also contributed to the clearance of my custom exhaust ;) *still for sale ! lol *

Not sure. I'll know exactly next month. It should be lite. I don't have to run my car to any sort of spec. I've done done serious things. I bought headlight covers to fill in the hole.
That's my thoughts. If anything it's chassie related but I've already more than reinforced that with a cage.

This should be easier to understand what I meant ...

http://www.the370z.com/members/megan...5-subframe.jpg

I'm not speaking of that bar. Only the W piece and the two bars tied together in a V shape that attaches to the drop down section you cut out on your car.

The bar it looks like your referring to is #6 in your first post. I'd definitely leave that.

yes , we are also talking about those bar


so what is the purpose of those bar...

think about them as a brace to avoid having those long threaded bolt to bent on loading ....

what is that V and W brace do ?
Its holding that screw to bent on load..

I understand that basic operation. But with the cage welded to the body and the subframe secure there's IMO no way those parts are need even in the minimal. The subframe and actual suspension work together up and down, left and right. And with the cage mounted to the furthest outside of the inside of the car the braces were speaking of are within the perimeters of the cage thus IMO opinion pointless. Can't really brace inside of a brace. Is this making sense?

I give up..

your rollbar are not holding the bottom tip of those long screw that hold your sub-frame.

if there is nothing or not enough brace to hold the bottom part of those long screw (see picture) they will bent a little bit which affect your alligment

on the 370z they only added a 3rd brace to do relatively the same job as the 2 other one (on the front part of the subframe which now has the V-Brace on the 370z)

do what you want. im done