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  #21  
Old 12-16-2010, 06:51 PM
Matt93SE Matt93SE is offline
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I wouldn't bother with 4130. lot of extra money for no extra strength over ERW at 1/4 the price, considering you're welding something with a shload of strength to some 15 yr old spot-welded sheet metal.
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  #22  
Old 12-16-2010, 07:01 PM
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ERW is ghetto - DOM is far superior in overall mechanical properties.
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  #23  
Old 12-16-2010, 07:40 PM
Matt93SE Matt93SE is offline
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sure.. until you consider the substrate you're welding to is significantly weaker and having the additional strength of DOM or 4130 is a moot point.
complete 4130 roll cage with normalized welds, yes. tiny chassis braces that will jsut rip out the mounting tabs on the chassis when it flexes anyway, no. :wall:
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I don't care what color they are as long as they are LONG AND HARD.
'04 G35 Sedan 6MT- The DD
'96 240SX- The Track Toy
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  #24  
Old 12-17-2010, 07:48 AM
SoSideways SoSideways is offline
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Well I only said 4130 because it's supposed to be a tad bit lighter than DOM, otherwise, DOM braces would be like $10 in material lol

But you don't have to make tiny mounting plates. Make huge ones, especially the ones that go in between the frame rails underneath, by the trans.

In any case, if anything, I plan on foaming the chassis anyway.
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  #25  
Old 12-17-2010, 07:54 AM
Black R Black R is offline
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Haha, well this thread really took off!

I ended up having my fabricator / welder friend weld in some reinforcements and make boxed in mini jacking blocks.

It works really well now, and I'm quite pleased with the results.

I'll take some pics so you guys can see how it looks.
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1990 240sx - Aristo 2JZGTE, R154, GT37, Defsport Wilwood kit, KTS coilovers - daily driver
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  #26  
Old 12-17-2010, 09:56 AM
PoorMans180SX PoorMans180SX is offline
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I want Koguchi-style underbraces/jacking points. My pinch welds are all messed up where my front fender mounts, and I can't fit a jack underneath my frame rails without rolling the car up on a stack of 2 2x4's. Cardinal sin I know.
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  #27  
Old 12-17-2010, 10:10 AM
Matt93SE Matt93SE is offline
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Quote:
Originally Posted by SoSideways View Post
Well I only said 4130 because it's supposed to be a tad bit lighter than DOM, otherwise, DOM braces would be like $10 in material lol

But you don't have to make tiny mounting plates. Make huge ones, especially the ones that go in between the frame rails underneath, by the trans.

In any case, if anything, I plan on foaming the chassis anyway.
lighter only by means of being able to use thinner-walled tubing for the same strength as DOM. when you're looking at 1" x .120" 4130, it's no lighter than 1" x .120" DOM.
All steels have the same density for all practical purposes. you just use thinner stuff when you go to 4130, but it loses strength if the welds aren't annealed so there's no benefit in using it on a car where you can't anneal it properly.
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I don't care what color they are as long as they are LONG AND HARD.
'04 G35 Sedan 6MT- The DD
'96 240SX- The Track Toy
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  #28  
Old 12-23-2010, 11:17 PM
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CodyAce CodyAce is offline
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Off topic

I found pcis of my 'ladder bars' if anyone wants to see them. Dubeloz or whatever the egay brand was. I forget how I got these...I think their 'subframe cross brace' thing didn't fit and I had to reweld them...they sent me these as a 'sorry/thank you'








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  #29  
Old 12-24-2010, 07:14 AM
Black R Black R is offline
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Those mount lengthwise?

And they're sturdy enough to jack up the car by?
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  #30  
Old 12-24-2010, 11:57 AM
Matt93SE Matt93SE is offline
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Yup. I have a set on my old Maxima and used them to jack the car up for years.


MAJOR chassis stiffness increase. not sure if it resulted in seconds off the clock, but it defininitely helped in driving confidence, which ultimately resulted in more speed.
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