Tubular Chassis Components?

[IJ.]

John: Where the stock rails are at their shallowest becomes the limiting factor, my idea allows for at least 40>50mm in z Vs 12mm for an external rail.

Think of it as boxing the seat rails then connecting them across the Trans tunnel in an X configuration.

 

[Doward]

I see what you're saying. I think that + a perimeter style SFC underneath would give maximum flex resistance.

 

[IJ.]

I'm just paranoid about ground clearence I have trouble with my driveway as it is

 

[group a supra]

John: Where the stock rails are at their shallowest becomes the limiting factor, my idea allows for at least 40>50mm in z Vs 12mm for an external rail.

Think of it as boxing the seat rails then connecting them across the Trans tunnel in an X configuration.

not a bad idea that ian
quite good for you

 

[Doward]

I'm just paranoid. I have trouble with my old age as it is

We feel for you, Ian.

 

[IJ.]

Maaaatttlockkkkkk :: IJ. ::

 

[Doward]

LOL

Having seen the difference first hand of Spohn subframe connectors on an F-Body (T-Top), I'm a firm believer in chassis stiffening.

I just don't want bars running around my interior ala a cage. I love the Supra for its touring performance - not necessarily looking for a race car here

 

[Neodeuccio]

I'm just paranoid about ground clearence I have trouble with my driveway as it is

Hell Ian, why didn't you say so? The obvious fix here would be to rebuild your entire driveway so you don't have to worry about your car. While you're at it, why not expand the garage and master bedroom too?








They should make me the Official SM Expert on Stupid Ideas.

 

[IJ.]

Trav: I fully intend one day to sell here and move out a bit so I can have 4>5 acres with a BIG shed (it WILL have a flat driveway)

I'm not overly concerned with the body flex as I've tuned my suspension to take the noodle effect into account.

 

[Neodeuccio]

I am looking to build a race-ready car. I'll eventually add a 4pt cage, but given the inconvenience of door bars and A-pillar bars I doubt I'll ever move up to a 6 or 8. Personally, I want as little flex as possible, even if that means loosing an inch or two of clearance.

 

[300zxpwns]

are most of these parts your building be aluminum or what? more weight reduction and ridgity is just what we need.

 

[supraguru05]

are most of these parts your building be aluminum or what? more weight reduction and ridgity is just what we need.

which will come from high strength steel tubing with thin wall thicknesses, not soft aluminum

 

[IJ.]

Pound for pound T6 Al is going to be stiffer if designed correctly just more expensive and a PITA to fabricate and heat treat then cold set.

 

[Doward]

I'm going to make the subframe connectors out of chromoly steel.

The control arms, I haven't decided on. Leaning toward Chromoly at this point, though (for materials savings lol)

Not only do I have to make them, but they do need to be somewhat affordable, right?

 

[Neodeuccio]

Affordable would be good.

 

[supraguru05]

thats interesting IJ pound for pound maybe since you could run larger cross sections, however i really think you could get a lighter subframe out of thin wall steel, you loose a lot of stiffness due to material properties. ultimately it all comes down to design so its not really a arguement that could be won, i could lock three engineers in a room and ask each to design a subframe and we would probably get steel, aluminum, and cast magnesium and they would all be light lol.

i just have more experience with chromoloy chassis for FSAE cars, as well as modal analysis of various body in whites where we use high strength steel in combination with aluminum for weight and stiffness.

Pound for pound T6 Al is going to be stiffer if designed correctly just more expensive and a PITA to fabricate and heat treat then cold set.

 

[funky_monkey58]

Doward here you are.

I went in from the frame rail out to the pinch rail and then boxed it in for added strength.

 

[Doward]

Very nice. And you did this on a hardtop?

 

[funky_monkey58]

Very nice. And you did this on a hardtop?

Yes I did my original intention was to build a road course track ready car.

I can say one thing, my car is stiff.

 

[guido]

stiff but this is extra weight...
how much do you think you add??