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turbogrill

Cab vs coupe in race trim - weight/stiffness?

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Hi

 

A cab is heavier and less stiff than a coupe in street trim. But what happens when you gut them and put in a cage?

 

The cage will stiff everything up, will the difference in stiffness be much less ?

 

And what about weight? Is a gutted cab heavier than a gutted coupé?

 

Is a Miata with roll cage less stiff than a E36 without roll cage? (Oranges to apples but you get the point).

 

(Not building something, just pointless thoughts).

 

 

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10 hours ago, turbogrill said:

Hi

 

A cab is heavier and less stiff than a coupe in street trim. But what happens when you gut them and put in a cage?

 

The cage will stiff everything up, will the difference in stiffness be much less ?

 

And what about weight? Is a gutted cab heavier than a gutted coupé?

 

Is a Miata with roll cage less stiff than a E36 without roll cage? (Oranges to apples but you get the point).

 

(Not building something, just pointless thoughts).

 

 

 

For those of us trying hard at weight reduction, i am not sure the "shell" that is left does much for stiffness either way. Several cars run just the outer skin from the door tops up....

 

I would guess coupes may be lighter in some models once gutted, if the floorpan is different (heavier) in the can version. This is assuming you are unwilling to cut out the extra reinforcements (break out the spot weld cutter). 

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2 hours ago, Black Magic said:

 

For those of us trying hard at weight reduction, i am not sure the "shell" that is left does much for stiffness either way. Several cars run just the outer skin from the door tops up....

 

I would guess coupes may be lighter in some models once gutted, if the floorpan is different (heavier) in the can version. This is assuming you are unwilling to cut out the extra reinforcements (break out the spot weld cutter). 

Easy solution: start with a coupe shell then make it into a convertible by removing the roof. 

 

Legal sidestep of the 60% bodywork rule. ;)

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2 hours ago, mender said:

Easy solution: start with a coupe shell then make it into a convertible by removing the roof. 

 

Legal sidestep of the 60% bodywork rule. ;)

 

I could see a time when we just rewrite the 60% rule as "must retain exterior sheetmetal for fenders, hood and trunk". 

 

I agree they should largely look like a car, and have front and rear closeouts. 

 

 

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